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Del Bosque A, Sánchez-Romate XF, Sánchez M, Ureña A. Toward flexible piezoresistive strain sensors based on polymer nanocomposites: a review on fundamentals, performance, and applications. Nanotechnology 2024; 35:292003. [PMID: 38621367 DOI: 10.1088/1361-6528/ad3e87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 04/15/2024] [Indexed: 04/17/2024]
Abstract
The fundamentals, performance, and applications of piezoresistive strain sensors based on polymer nanocomposites are summarized herein. The addition of conductive nanoparticles to a flexible polymer matrix has emerged as a possible alternative to conventional strain gauges, which have limitations in detecting small strain levels and adapting to different surfaces. The evaluation of the properties or performance parameters of strain sensors such as the elongation at break, sensitivity, linearity, hysteresis, transient response, stability, and durability are explained in this review. Moreover, these nanocomposites can be exposed to different environmental conditions throughout their lifetime, including different temperature, humidity or acidity/alkalinity levels, that can affect performance parameters. The development of flexible piezoresistive sensors based on nanocomposites has emerged in recent years for applications related to the biomedical field, smart robotics, and structural health monitoring. However, there are still challenges to overcome in designing high-performance flexible sensors for practical implementation. Overall, this paper provides a comprehensive overview of the current state of research on flexible piezoresistive strain sensors based on polymer nanocomposites, which can be a viable option to address some of the major technological challenges that the future holds.
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Affiliation(s)
- Antonio Del Bosque
- Technology, Instruction and Design in Engineering and Education Research Group (TiDEE.rg), Catholic University of Ávila, C/Canteros s/n, E-05005 Ávila, Spain
| | - Xoan F Sánchez-Romate
- Materials Science and Engineering Area, Higher School of Experimental Sciences and Technology, Rey Juan Carlos University, C/Tulipán s/n, Móstoles, E-28933 Madrid, Spain
| | - María Sánchez
- Materials Science and Engineering Area, Higher School of Experimental Sciences and Technology, Rey Juan Carlos University, C/Tulipán s/n, Móstoles, E-28933 Madrid, Spain
- Instituto de Tecnologías Para la Sostenibilidad, Rey Juan Carlos University, C/Tulipán s/n, E-28933 Móstoles, Madrid, Spain
| | - Alejandro Ureña
- Materials Science and Engineering Area, Higher School of Experimental Sciences and Technology, Rey Juan Carlos University, C/Tulipán s/n, Móstoles, E-28933 Madrid, Spain
- Instituto de Tecnologías Para la Sostenibilidad, Rey Juan Carlos University, C/Tulipán s/n, E-28933 Móstoles, Madrid, Spain
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2
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Qi M, Liu Y, Wang Z, Yuan S, Li K, Zhang Q, Chen M, Wei L. Self-Healable Multifunctional Fibers via Thermal Drawing. Adv Sci (Weinh) 2024:e2400785. [PMID: 38682447 DOI: 10.1002/advs.202400785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 04/08/2024] [Indexed: 05/01/2024]
Abstract
The development of soft electronics and soft fiber devices has significantly advanced flexible and wearable technology. However, they still face the risk of damage when exposed to sharp objects in real-life applications. Taking inspiration from nature, self-healable materials that can restore their physical properties after external damage offer a solution to this problem. Nevertheless, large-scale production of self-healable fibers is currently constrained. To address this limitation, this study leverages the thermal drawing technique to create elastic and stretchable self-healable thermoplastic polyurethane (STPU) fibers, enabling cost-effective mass production of such functional fibers. Furthermore, despite substantial research into the mechanisms of self-healable materials, quantifying their healing speed and time poses a persistent challenge. Thus, transmission spectra are employed as a monitoring tool to observe the real-time self-healing process, facilitating an in-depth investigation into the healing kinetics and efficiency. The versatility of the fabricated self-healable fiber extends to its ability to be doped with a wide range of functional materials, including dye molecules and magnetic microparticles, which enables modular assembly to develop distributed strain sensors and soft actuators. These achievements highlight the potential applications of self-healable fibers that seamlessly integrate with daily lives and open up new possibilities in various industries.
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Affiliation(s)
- Miao Qi
- College of Biomedical Engineering & Instrument Science, Key Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou, 310027, China
- Zhejiang Lab, Hangzhou, 311100, China
| | - Yanting Liu
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Zhe Wang
- Key Laboratory of Bionic Engineering of Ministry of Education, Jilin University, Changchun, 130022, China
| | - Shixing Yuan
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Kaiwei Li
- Key Laboratory of Bionic Engineering of Ministry of Education, Jilin University, Changchun, 130022, China
| | - Qichong Zhang
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China
| | - Mengxiao Chen
- College of Biomedical Engineering & Instrument Science, Key Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou, 310027, China
- Zhejiang Lab, Hangzhou, 311100, China
| | - Lei Wei
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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3
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Hu T, Sheng B. A Highly Sensitive Strain Sensor with Wide Linear Sensing Range Prepared on a Hybrid-Structured CNT/Ecoflex Film via Local Regulation of Strain Distribution. ACS Appl Mater Interfaces 2024. [PMID: 38603806 DOI: 10.1021/acsami.4c00648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
With the development of information technology, high-performance wearable strain sensors with high sensitivity and stretchability have played a significant role in motion detection. However, many high-sensitivity and outstanding-stretchability strain sensors possess a limited linear sensing range, which limits the enhancement of the flexible strain sensors' performance. Herein, we develop a hybrid-structured carbon nanotube (CNT)/Ecoflex strain sensor with laser-engraved grooves along with punched circular holes in a composite CNT/Ecoflex film by vacuum filtration and permeation. By optimizing the distribution of grooves and circular holes, the strain in the sensing layer can be locally regulated, which alters the morphology of cracks under strain and allows the hybrid-structured CNT/Ecoflex strain sensor to simultaneously exhibit high sensitivity (GF = 43.8) as well as a wide linear sensing range (200%). On the basis of excellent performance, the hybrid-structured CNT/Ecoflex strain sensor is capable of detecting movements in various parts of the human body, including movements of larynx and joint bending.
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Affiliation(s)
- Tao Hu
- School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai Key Laboratory of Modern Optical Systems, Engineering Research Center of Optical Instruments and Systems, Shanghai 200093, China
| | - Bin Sheng
- School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Shanghai Key Laboratory of Modern Optical Systems, Engineering Research Center of Optical Instruments and Systems, Shanghai 200093, China
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4
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Jayamaha H, Ugras TJ, Page KA, Hanrath T, Robinson RD, Shepherd LM. Chiroptical Strain Sensors from Electrospun Cadmium Sulfide Quantum-Dot Fibers. ACS Appl Mater Interfaces 2024; 16:17757-17765. [PMID: 38535523 PMCID: PMC11009915 DOI: 10.1021/acsami.3c17623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 02/27/2024] [Accepted: 03/08/2024] [Indexed: 04/12/2024]
Abstract
Controllable synthesis of homochiral nano/micromaterials has been a constant challenge for fabricating various stimuli-responsive chiral sensors. To provide an avenue to this goal, we report electrospinning as a simple and economical strategy to form continuous homochiral microfibers with strain-sensitive chiroptical properties. First, electrospun homochiral microfibers from self-assembled cadmium sulfide (CdS) quantum dot magic-sized clusters (MSCs) are produced. Highly sensitive and reversible strain sensors are then fabricated by embedding these chiroptically active fibers into elastomeric films. The chiroptical response on stretching is indicated quantitatively as reversible changes in magnitude, spectral position (wavelength), and sign in circular dichroism (CD) and linear dichroism (LD) signals and qualitatively as a prominent change in the birefringence features under cross-polarizers. The observed periodic twisted helical fibrils at the surface of fibers provide insights into the origin of the fibers' chirality. The measurable shifts in CD and LD are caused by elastic deformations of these helical fibrillar structures of the fiber. To elucidate the origin of these chiroptical properties, we used field emission-electron microscopy (FE-SEM), atomic force microscopy (AFM), synchrotron X-ray analysis, polarized optical microscopy, as well as measurements to isolate the true CD, and contributions from photoelastic modulators (PEM) and LD. Our findings thus offer a promising strategy to fabricate chiroptical strain-sensing devices with multiple measurables/observables using electric-field-assisted spinning of homochiral nano/microfibers.
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Affiliation(s)
- Hansadi Jayamaha
- Department
of Human Centered Design, Cornell University, Ithaca, New York 14853, United States
| | - Thomas J. Ugras
- School
of Applied and Engineering Physics, Cornell
University, Ithaca, New York 14853, United States
| | - Kirt A. Page
- Materials
and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio 45433, United States
- UES,
Inc., Beavercreek, Ohio 45432, United States
- Cornell
High Energy Synchrotron Source, Cornell
University, Ithaca, New York 14853, United States
| | - Tobias Hanrath
- Robert F.
Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, United States
| | - Richard D. Robinson
- Department
of Materials Science and Engineering, Cornell
University, Ithaca, New York 14853, United States
| | - Larissa M. Shepherd
- Department
of Human Centered Design, Cornell University, Ithaca, New York 14853, United States
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Navitski I, Ramanaviciute A, Ramanavicius S, Pogorielov M, Ramanavicius A. MXene-Based Chemo-Sensors and Other Sensing Devices. Nanomaterials (Basel) 2024; 14:447. [PMID: 38470777 DOI: 10.3390/nano14050447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 02/15/2024] [Accepted: 02/24/2024] [Indexed: 03/14/2024]
Abstract
MXenes have received worldwide attention across various scientific and technological fields since the first report of the synthesis of Ti3C2 nanostructures in 2011. The unique characteristics of MXenes, such as superior mechanical strength and flexibility, liquid-phase processability, tunable surface functionality, high electrical conductivity, and the ability to customize their properties, have led to the widespread development and exploration of their applications in energy storage, electronics, biomedicine, catalysis, and environmental technologies. The significant growth in publications related to MXenes over the past decade highlights the extensive research interest in this material. One area that has a great potential for improvement through the integration of MXenes is sensor design. Strain sensors, temperature sensors, pressure sensors, biosensors (both optical and electrochemical), gas sensors, and environmental pollution sensors targeted at volatile organic compounds (VOCs) could all gain numerous improvements from the inclusion of MXenes. This report delves into the current research landscape, exploring the advancements in MXene-based chemo-sensor technologies and examining potential future applications across diverse sensor types.
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Affiliation(s)
- Ilya Navitski
- Department of Nanotechnology, State Research Institute Center for Physical Sciences and Technology (FTMC), Sauletekio av. 3, LT-10257 Vilnius, Lithuania
- Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Agne Ramanaviciute
- Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
| | - Simonas Ramanavicius
- Department of Organic Chemistry, State Research Institute Center for Physical Sciences and Technology, Saulėtekio av. 3, LT-10257 Vilnius, Lithuania
| | - Maksym Pogorielov
- Biomedical Research Centre, Sumy State University, 2, Kharkivska Str., 40007 Sumy, Ukraine
- Institute of Atomic Physics and Spectroscopy, University of Latvia, 3 Jelgavas St., LV-1004 Riga, Latvia
| | - Arunas Ramanavicius
- Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
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Josline MJ, Ghods S, Kosame S, Choi JH, Kim W, Kim S, Chang S, Hyun SH, Kim SI, Moon JY, Park HG, Cho SB, Ju H, Lee JH. Uniform Synthesis of Bilayer Hydrogen Substituted Graphdiyne for Flexible Piezoresistive Applications. Small 2024:e2307276. [PMID: 38196162 DOI: 10.1002/smll.202307276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/21/2023] [Indexed: 01/11/2024]
Abstract
Graphdiyne (GDY) has garnered significant attention as a cutting-edge 2D material owing to its distinctive electronic, optoelectronic, and mechanical properties, including high mobility, direct bandgap, and remarkable flexibility. One of the key challenges hindering the implementation of this material in flexible applications is its large area and uniform synthesis. The facile growth of centimeter-scale bilayer hydrogen substituted graphdiyne (Bi-HsGDY) on germanium (Ge) substrate is achieved using a low-temperature chemical vapor deposition (CVD) method. This material's field effect transistors (FET) showcase a high carrier mobility of 52.6 cm2 V-1 s-1 and an exceptionally low contact resistance of 10 Ω µm. By transferring the as-grown Bi-HsGDY onto a flexible substrate, a long-distance piezoresistive strain sensor is demonstrated, which exhibits a remarkable gauge factor of 43.34 with a fast response time of ≈275 ms. As a proof of concept, communication by means of Morse code is implemented using a Bi-HsGDY strain sensor. It is believed that these results are anticipated to open new horizons in realizing Bi-HsGDY for innovative flexible device applications.
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Affiliation(s)
- Mukkath Joseph Josline
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - Soheil Ghods
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - Saikiran Kosame
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
- Department of Physics, Gachon University, Seongnam, South Korea
| | - Jun-Hui Choi
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - Woongchan Kim
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - Sein Kim
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - SooHyun Chang
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - Sang Hwa Hyun
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - Seung-Il Kim
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
- Department of Mechanical Engineering and Materials Science, Washington University in Saint Louis, Saint Louis, MO, USA
| | - Ji-Yun Moon
- Department of Mechanical Engineering and Materials Science, Washington University in Saint Louis, Saint Louis, MO, USA
| | - Hyeong Gi Park
- AI-Superconvergence KIURI Translational Research Center, Ajou University, School of Medicine, Suwon, 16499, South Korea
| | - Sung Beom Cho
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - Heongkyu Ju
- Department of Physics, Gachon University, Seongnam, South Korea
| | - Jae-Hyun Lee
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, South Korea
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
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Guo X, Sun Y, Sun X, Li J, Wu J, Shi Y, Pan L. Doping Engineering of Conductive Polymers and Their Application in Physical Sensors for Healthcare Monitoring. Macromol Rapid Commun 2024; 45:e2300246. [PMID: 37534567 DOI: 10.1002/marc.202300246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 06/17/2023] [Indexed: 08/04/2023]
Abstract
Physical sensors have emerged as a promising technology for real-time healthcare monitoring, which tracks various physical signals from the human body. Accurate acquisition of these physical signals from biological tissue requires excellent electrical conductivity and long-term durability of the sensors under complex mechanical deformation. Conductive polymers, combining the advantages of conventional polymers and organic conductors, are considered ideal conductive materials for healthcare physical sensors due to their intrinsic conductive network, tunable mechanical properties, and easy processing. Doping engineering has been proposed as an effective approach to enhance the sensitivity, lower the detection limit, and widen the operational range of sensors based on conductive polymers. This approach enables the introduction of dopants into conductive polymers to adjust and control the microstructure and energy levels of conductive polymers, thereby optimizing their mechanical and conductivity properties. This review article provides a comprehensive overview of doping engineering methods to improve the physical properties of conductive polymers and highlights their applications in the field of healthcare physical sensors, including temperature sensors, strain sensors, stress sensors, and electrophysiological sensing. Additionally, the challenges and opportunities associated with conductive polymer-based physical sensors in healthcare monitoring are discussed.
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Affiliation(s)
- Xin Guo
- Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
| | - Yuqiong Sun
- Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
| | - Xidi Sun
- Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
| | - Jiean Li
- Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
| | - Jing Wu
- Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
| | - Yi Shi
- Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
| | - Lijia Pan
- Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China
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8
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Cao C, Huang T, Li Y. Resilient and Tough Conductive Polymer Hydrogel for a Low-Hysteresis Strain Sensor. Macromol Rapid Commun 2024; 45:e2300467. [PMID: 37863475 DOI: 10.1002/marc.202300467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 10/09/2023] [Indexed: 10/22/2023]
Abstract
Conductive polymer hydrogels are vital in strain sensors, yet achieving high resilience and toughness is a challenge. This study employs a prestretch method to engineer a tough conductive polymer hydrogel with sufficient resilience. Initially, a blend film of polyvinylalcohol (PVA) and ethylene-vinyl alcohol copolymer (EVOH) is prepared through solution casting, followed by a swelling process to form a PVA-EVOH hydrogel. This hydrogel, with PVA crystallites as crosslinking points, exhibits high toughness. The hydrogel is then immersed in pyrrole and ferric chloride solutions for in-situ polymerization of polypyrrole (PPy), creating a conductive PPy/PVA-EVOH hydrogel. Finally, a 200% prestretch is applied, breaking short chains within the network, eliminating energy dissipation at low strains. This results in a hydrogel with a 100% elastic deformation range, while maintaining high fracture toughness (1700 J m-2 ). The prestretched PPy/PVA-EVOH hydrogel functions as a strain sensor with low hysteresis, providing consistent strain measurements during loading and unloading. This outperforms the non-prestretched sample, which shows inconsistent responses between stretching and releasing.
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Affiliation(s)
- Chunyan Cao
- School of Electrics and Computer Engineering, Nanfang College, Guangzhou, Guangzhou, 510970, China
| | - Tao Huang
- College of Information Technology, Jilin Engineering Research Center of Optoelectronic Materials and Devices, Jilin Normal University, Siping, 136000, China
| | - Yunming Li
- School of New Energy Science and Engineering, Xinyu University, Xinyu, 338004, China
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Hou Y, Gao M, Gao J, Zhao L, Teo EHT, Wang D, Qi HJ, Zhou K. 3D Printed Conformal Strain and Humidity Sensors for Human Motion Prediction and Health Monitoring via Machine Learning. Adv Sci (Weinh) 2023; 10:e2304132. [PMID: 37939292 PMCID: PMC10754119 DOI: 10.1002/advs.202304132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 09/19/2023] [Indexed: 11/10/2023]
Abstract
Wearable sensors have garnered considerable attention due to their flexibility and lightweight characteristics in the realm of healthcare applications. However, developing robust wearable sensors with facile fabrication and good conformity remains a challenge. In this study, a conductive graphene nanoplate-carbon nanotube (GC) ink is synthesized for multi jet fusion (MJF) printing. The layer-by-layer fabrication process of MJF not only improves the mechanical and flame-retardant properties of the printed GC sensor but also bolsters its robustness and sensitivity. The direction of sensor bending significantly impacts the relative resistance changes, allowing for precise investigations of joint motions in the human body, such as those of the fingers, wrists, elbows, necks, and knees. Furthermore, the data of resistance changes collected by the GC sensor are utilized to train a support vector machine with a 95.83% accuracy rate for predicting human motions. Due to its stable humidity sensitivity, the sensor also demonstrates excellent performance in monitoring human breath and predicting breath modes (normal, fast, and deep breath), thereby expanding its potential applications in healthcare. This work opens up new avenues for using MJF-printed wearable sensors for a variety of healthcare applications.
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Affiliation(s)
- Yanbei Hou
- HP‐NTU Digital Manufacturing Corporate LabSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
- Singapore Centre for 3D PrintingSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
| | - Ming Gao
- HP‐NTU Digital Manufacturing Corporate LabSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
- Singapore Centre for 3D PrintingSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
| | - Jingwen Gao
- Singapore Centre for 3D PrintingSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
| | - Lihua Zhao
- HP‐NTU Digital Manufacturing Corporate LabSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
- 3D LabHP LabsHP Inc.Palo AltoCA94304USA
| | - Edwin Hang Tong Teo
- School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore639798Singapore
| | - Dong Wang
- School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240China
| | - H. Jerry Qi
- The George Woodruff School of Mechanical EngineeringGeorgia Institute of TechnologyAtlantaGA30332USA
| | - Kun Zhou
- HP‐NTU Digital Manufacturing Corporate LabSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
- Singapore Centre for 3D PrintingSchool of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingapore639798Singapore
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10
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Wang C, Yang B, Xiang R, Ji J, Wu Y, Tan S. High-Saline-Enabled Hydrophobic Homogeneous Cross-Linking for Extremely Soft, Tough, and Stretchable Conductive Hydrogels as High-Sensitive Strain Sensors. ACS Nano 2023; 17:23194-23206. [PMID: 37926964 DOI: 10.1021/acsnano.3c09884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
Design of admirable conductive hydrogels combining robust toughness, soft flexibility, desirable conductivity, and freezing resistance remains daunting challenges for meeting the customized and critical demands of flexible and wearable electronics. Herein, a promising and facile strategy to prepare hydrogels tailored to these anticipated demands is proposed, which is prepared in one step by homogeneous cross-linking of acrylamide using hydrophobic divinylbenzene stabilized by micelles under saturated high-saline solutions. The influence of high-saline environments on the hydrogel topology and mechanical performance is investigated. The high-saline environments suppress the size of hydrophobic cross-linkers in micelles during hydrogel polymerization, which weaken the dynamic hydrophobic associations to soften the hydrogels. Nevertheless, the homogeneous cross-linked networks ensure antifracture during ultralarge deformations. The obtained hydrogels show special mechanical performance combining extremely soft deformability and antifracture features (Young's modulus, 5 kPa; stretchability, 10200%; toughness, 134 kJ m-2; and excellent anticrack propagation). The saturated-saline environments also endow the hydrogels with desirable ion conductivity (106 mS cm-1) and freezing resistance (<20 °C). These comprehensive properties of the obtained hydrogels are quite suitable for flexible electronic applications, which is demonstrated by the high sensitivity and durability of the derived strain sensors.
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Affiliation(s)
- Caihong Wang
- School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, People's Republic of China
| | - Baibin Yang
- School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, People's Republic of China
| | - Ruihan Xiang
- School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, People's Republic of China
| | - Junyi Ji
- School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, People's Republic of China
| | - Yong Wu
- School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, People's Republic of China
| | - Shuai Tan
- School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, People's Republic of China
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11
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Rollo G, Ronca A, Cerruti P, Xia H, Gruppioni E, Lavorgna M. Optimization of Piezoresistive Response of Elastomeric Porous Structures Based on Carbon-Based Hybrid Fillers Created by Selective Laser Sintering. Polymers (Basel) 2023; 15:4404. [PMID: 38006128 PMCID: PMC10674563 DOI: 10.3390/polym15224404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/03/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
Recently, piezoresistive sensors made by 3D printing have gained considerable interest in the field of wearable electronics due to their ultralight nature, high compressibility, robustness, and excellent electromechanical properties. In this work, building on previous results on the Selective Laser Sintering (SLS) of porous systems based on thermoplastic polyurethane (TPU) and graphene (GE)/carbon nanotubes (MWCNT) as carbon conductive fillers, the effect of variables such as thickness, diameter, and porosity of 3D printed disks is thoroughly studied with the aim of optimizing their piezoresistive performance. The resulting system is a disk with a diameter of 13 mm and a thickness of 0.3 mm endowed with optimal reproducibility, sensitivity, and linearity of the electrical signal. Dynamic compressive strength tests conducted on the proposed 3D printed sensors reveal a linear piezoresistive response in the range of 0.1-2 N compressive load. In addition, the optimized system is characterized at a high load frequency (2 Hz), and the stability and sensitivity of the electrical signal are evaluated. Finally, an application test demonstrates the ability of this system to be used as a real-time wearable pressure sensor for applications in prosthetics, consumer products, and personalized health-monitoring systems.
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Affiliation(s)
- Gennaro Rollo
- Institute of Polymers, Composites and Biomaterials, National Research Council, Via Previati, 1, 23900 Lecco, Italy; (A.R.); (P.C.)
| | - Alfredo Ronca
- Institute of Polymers, Composites and Biomaterials, National Research Council, Via Previati, 1, 23900 Lecco, Italy; (A.R.); (P.C.)
- Institute of Polymers, Composites and Biomaterials, National Research Council Viale J.F. Kennedy, 80125 Naples, Italy
| | - Pierfrancesco Cerruti
- Institute of Polymers, Composites and Biomaterials, National Research Council, Via Previati, 1, 23900 Lecco, Italy; (A.R.); (P.C.)
- Institute of Polymers, Composites and Biomaterials, National Research Council, Via Campi Flegrei, 34, 80078 Pozzuoli, Italy
| | - Hesheng Xia
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China;
| | - Emanuele Gruppioni
- Istituto nazionale Assicurazione Infortuni sul Lavoro (INAIL), Centro Protesi, Via Rabuina, Vigorso di Budrio, 40054 Bologna, Italy;
| | - Marino Lavorgna
- Institute of Polymers, Composites and Biomaterials, National Research Council, Via Previati, 1, 23900 Lecco, Italy; (A.R.); (P.C.)
- Institute of Polymers, Composites and Biomaterials, National Research Council, P. le Enrico Fermi, 80055 Portici, Italy
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12
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Sun Z, Dong C, Chen B, Li W, Hu H, Zhou J, Li C, Huang Z. Strong, Tough, and Anti-Swelling Supramolecular Conductive Hydrogels for Amphibious Motion Sensors. Small 2023; 19:e2303612. [PMID: 37394709 DOI: 10.1002/smll.202303612] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 06/20/2023] [Indexed: 07/04/2023]
Abstract
Conductive polymer hydrogels (CPHs) are widely employed in emerging flexible electronic devices because they possess both the electrical conductivity of conductors and the mechanical properties of hydrogels. However, the poor compatibility between conductive polymers and the hydrogel matrix, as well as the swelling behavior in humid environments, greatly compromises the mechanical and electrical properties of CPHs, limiting their applications in wearable electronic devices. Herein, a supramolecular strategy to develop a strong and tough CPH with excellent anti-swelling properties by incorporating hydrogen, coordination bonds, and cation-π interactions between a rigid conducting polymer and a soft hydrogel matrix is reported. Benefiting from the effective interactions between the polymer networks, the obtained supramolecular hydrogel has homogeneous structural integrity, exhibiting remarkable tensile strength (1.63 MPa), superior elongation at break (453%), and remarkable toughness (5.5 MJ m-3 ). As a strain sensor, the hydrogel possesses high electrical conductivity (2.16 S m-1 ), a wide strain linear detection range (0-400%), and excellent sensitivity (gauge factor = 4.1), sufficient to monitor human activities with different strain windows. Furthermore, this hydrogel with high swelling resistance has been successfully applied to underwater sensors for monitoring frog swimming and underwater communication. These results reveal new possibilities for amphibious applications of wearable sensors.
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Affiliation(s)
- Zhiyuan Sun
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518000, P. R. China
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Chao Dong
- Chemistry and Physics Department, College of Art and Science, The University of Texas of Permian Basin, Odessa, TX, 79762, USA
| | - Bingda Chen
- Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS), Zhongguancun North First Street 2, Beijing, 100190, P. R. China
| | - Wenbo Li
- AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, P. R. China
| | - Huiyuan Hu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518000, P. R. China
- Guangdong Polytechnic of Science and Technology, Zhuhai, 519090, P. R. China
| | - Jinsheng Zhou
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518000, P. R. China
| | - Chong Li
- Guangdong Polytechnic of Science and Technology, Zhuhai, 519090, P. R. China
| | - Zhandong Huang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
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13
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Du Y, Liu Y, Lu W, Zhang X, Wang A, Kong J. Nacre-Inspired MXene Nanocomposite-based Strain Sensor with Ultrahigh Sensitivity in a Small Strain Range for Parkinson's Disease Diagnosis. ACS Appl Mater Interfaces 2023; 15:50413-50426. [PMID: 37857376 DOI: 10.1021/acsami.3c13815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
Nowadays, chronic diseases are the primary threat to public health and are getting younger. By taking the advantages of continuousness, convenience, and real-time response, wearable strain sensors have been given great attention to diagnose chronic diseases via analyzing the patient's health state. However, most physiological signals, such as limb tremor of Parkinson's disease, microexpression, and slight joint movement, are tiny and difficult to be detected. Therefore, the development of strain sensors characterized with ultrahigh sensitivity in a small strain range (ε < 10%) is urgent. Inspired by nacre's hierarchical structure, we have fabricated nacre-mimetic nanocomposites with "brick-and-mortar" architecture by employing polyacrylamide (PAM) and Ti3C2Tx MXene nanosheets through a layer-by-layer (LBL) spin-coating technique. The resultant nanocomposite-based strain sensor exhibits ultrahigh sensitivity in a small strain range (GF = 296.8, ε < 10%), attributed to the bioinspired hierarchical structure and hydrogen bond-enhanced interfacial interactions. In addition, a high reliability, broad working sensing range (453%), short response time (183 ms), skin-like tensile stress (7.2 MPa), and excellent durability (2000 cycles) are also achieved. Due to the ultrahigh sensitivity within a small strain, the reported strain sensor can accurately diagnose and distinguish Parkinson's disease symptoms, including thumb pill-rolling tremor, masked face (microexpression), intermittent shaking of the head, and limb cogwheel motion. This work provides new insights to design strain sensors with high sensitivity for monitoring tiny signals and for disease diagnosis.
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Affiliation(s)
- Yuzhang Du
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Yichen Liu
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Wenxuan Lu
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Xuan Zhang
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Aoao Wang
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Jie Kong
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
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14
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Jiang C, Li T, Huang X, Guo R. Patterned Liquid-Metal-Enabled Universal Soft Electronics (PLUS-E) for Deformation Sensing on 3D Curved Surfaces. ACS Appl Mater Interfaces 2023. [PMID: 37878994 DOI: 10.1021/acsami.3c11845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
Liquid metals with metallic conductivity and infinitely deformable properties have tremendous potential in the field of conformal electronics. However, most processing methods of liquid metal electronics require sophisticated apparatus or custom masks, resulting in high processing costs and intricate preparation procedures. This study proposes a simple and rapid preparation method for patterned liquid-metal-enabled universal soft electronics (PLUS-E). The utilization of selective adhesion of the liquid metals on stretchable substrates and the adaptive toner mask enables rapid fabrication (<2 s/100 cm2), excellent stretchability (800% strain), and high forming accuracy (100 μm). Benefiting from the adaptive deformation of the substrate and toner mask, PLUS-E can be conformally applied to any shape of 3D surfaces. Besides, the stability of PLUS-E on 3D surfaces is improved by low-fluidity liquid metal composites. The finite element simulation is used to accurately forecast the deformation and resistance changes of the PLUS-E, and it provides guidance for device design and manufacturing. Finally, this method was utilized to develop various sensors for detecting human motion, catheter bending, and balloon expansion. All of them have obtained stable and reliable signal measurements, demonstrating the usefulness of PLUS-E in real-world applications.
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Affiliation(s)
- Chengjie Jiang
- Department of Biomedical Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Tianyu Li
- Department of Biomedical Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China
| | - Xian Huang
- Department of Biomedical Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China
- Flexible Wearable Technology Research Center, Institute of Flexible Electronics Technology of Tsinghua, 906 Yatai Road, Jiaxing 314033, China
- Institute of Wearable Technology and Bioelectronics, Qiantang Science and Technology Innovation Center, 1002 23rd Street, Hangzhou 310018, China
| | - Rui Guo
- Department of Biomedical Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China
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15
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Wang G, Wang X, Liu W, Liu X, Song Z, Yu D, Li G, Ge S, Wang H. Establishing a Corrugated Carbon Network with a Crack Structure in a Hydrogel for Improving Sensing Performance. ACS Appl Mater Interfaces 2023; 15:48462-48474. [PMID: 37812139 DOI: 10.1021/acsami.3c10949] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Electronic conductive hydrogels have prompted immense research interest as flexible sensing materials. However, establishing a continuous electronic conductive network within a hydrogel is still highly challenging. Herein, we develop a new strategy to establish a continuous corrugated carbon network within a hydrogel by embedding carbonized crepe paper into the hydrogel with its corrugations perpendicular to the stretching direction using a casting technique. The corrugated carbon network within the as-prepared composite hydrogel serves as a rigid conductive network to simultaneously improve the tensile strength and conductivity of the composite hydrogel. The composite hydrogel also generates a crack structure when it is stretched, enabling the composite hydrogel to show ultrahigh sensitivity (gauge factor = 59.7 and 114 at strain ranges of 0-60 and 60-100%, respectively). The composite hydrogel also shows an ultralow detection limit of 0.1%, an ultrafast response/recovery time of 75/95 ms, and good stability and durability (5000 cycles at 10% strain) when used as a resistive strain sensing material. Moreover, the good stretchability, adhesiveness, and self-healing ability of the hydrogel were also effectively retained after the corrugated carbon network was introduced into the hydrogel. Because of its outstanding sensing performance, the composite hydrogel has potential applications in sensing various human activities, including accurately recording subtle variations in wrist pulse waves and small-/large-scale complex human activities. Our work provides a new approach to develop economical, environmentally friendly, and reliable electronic conductive hydrogels with ultrahigh sensing performance for the future development of electronic skin and wearable devices.
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Affiliation(s)
- Guixing Wang
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Xueyan Wang
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Wenxia Liu
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Xiaona Liu
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Zhaoping Song
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Dehai Yu
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Guodong Li
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
| | - Shaohua Ge
- Department of Periodontology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong 250012, China
| | - Huili Wang
- State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, China
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16
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Zhao L, Xu H, Liu L, Zheng Y, Han W, Wang L. MXene-Induced Flexible, Water-Retention, Semi-Interpenetrating Network Hydrogel for Ultra-Stable Strain Sensors with Real-Time Gesture Recognition. Adv Sci (Weinh) 2023; 10:e2303922. [PMID: 37672883 PMCID: PMC10602575 DOI: 10.1002/advs.202303922] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 08/06/2023] [Indexed: 09/08/2023]
Abstract
As water-saturated polymer networks, hydrogels are a growing family of soft materials that have recently become promising candidates for flexible electronics application. However, it remains still difficult for hydrogel-based strain sensors to achieve the organic unity of mechanical properties, electrical conductivity, and water retention. To address this challenge, based on the template, the excellent properties of MXene nanoflakes (rich surface functional groups, high specific surface area, hydrophilicity, and conductivity) are fully utilized in this study to prepare the P(AA-co-AM)/MXene@PDADMAC semi-interpenetrating network (semi-IPN) hydrogel. The proposed hydrogel continues to exhibit excellent strain response and flexibility after 30 days of storage at room temperature, and its performance do not decrease after 1100 cycles. Considering these characteristics, a hydrogel-based device for converting sign language into Chinese characters is successfully developed and optimized using machine learning. Therefore, this study provides novel insight and application directions for hydrogel families.
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Affiliation(s)
- Lianjia Zhao
- State Key Laboratory for Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of Sciences & Center of Materials Science and Optoelectronic EngineeringUniversity of Chinese Academy of Sciences100083BeijingP. R. China
- College of PhysicsState Key Laboratory of Inorganic Synthesis and Preparative ChemistryInternational Center of Future ScienceJilin University130012ChangchunP. R. China
- Qingdao Innovation and Developmemt Center of Harbin Engineering UniversityQingdao266400China
| | - Hao Xu
- State Key Laboratory for Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of Sciences & Center of Materials Science and Optoelectronic EngineeringUniversity of Chinese Academy of Sciences100083BeijingP. R. China
| | - Lingchen Liu
- State Key Laboratory for Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of Sciences & Center of Materials Science and Optoelectronic EngineeringUniversity of Chinese Academy of Sciences100083BeijingP. R. China
| | - Yiqiang Zheng
- State Key Laboratory for Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of Sciences & Center of Materials Science and Optoelectronic EngineeringUniversity of Chinese Academy of Sciences100083BeijingP. R. China
- College of PhysicsState Key Laboratory of Inorganic Synthesis and Preparative ChemistryInternational Center of Future ScienceJilin University130012ChangchunP. R. China
| | - Wei Han
- College of PhysicsState Key Laboratory of Inorganic Synthesis and Preparative ChemistryInternational Center of Future ScienceJilin University130012ChangchunP. R. China
| | - Lili Wang
- State Key Laboratory for Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of Sciences & Center of Materials Science and Optoelectronic EngineeringUniversity of Chinese Academy of Sciences100083BeijingP. R. China
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17
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Su X, Zhai S, Jin K, Li C, Chen A, Cai Z, Xian C, Zhao Y. Rapid and Controllable Preparation of Multifunctional Lignin-Based Eutectogels for the Design of High-Performance Flexible Sensors. ACS Appl Mater Interfaces 2023; 15:45526-45535. [PMID: 37708401 DOI: 10.1021/acsami.3c11915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
Currently, there is a limited amount of research on PEDOT:LS (poly(3,4-ethylenedioxythiophene):sulfonated lignin)-based hydrogels. While the addition of PEDOT:LS can enhance the conductivity of the gel, it unavoidably disrupts the gel network and negatively affects its mechanical properties. The preparation process and freezing resistance of the hydrogels also pose significant challenges for their practical applications. In this study, we have developed a novel self-catalytic system, PEDOT:LS-Fe3+, for the rapid fabrication of conductive hydrogels. These hydrogels are further transformed into eutectogels by immersing them in a deep eutectic solvent. Compared with conventional hydrogels, the eutectogels exhibit improved elongation, mechanical strength, and resistance to freezing. Specifically, the eutectogels containing 2 wt % PEDOT:LS as conductive fillers and catalysts demonstrate exceptional stretchability (∼460%), self-adhesion (∼14.6 kPa on paper), UV-blocking capability (∼99.9%), and ionic conductivity (∼1.2 mS cm-1) even at extremely low temperatures (-60 °C). Moreover, the eutectogels exhibit high stability and sensitivity in flexible sensing, successfully detecting various human motions. This study presents a novel approach for the rapid preparation of the hydrogels by utilizing lignin in the conductive PEDOT polymerization process and forming a self-catalytic system with metal ions. These advancements make the eutectogels a promising candidate material for flexible wearable electronics.
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Affiliation(s)
- Xing Su
- College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
| | - Shixiong Zhai
- School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Kaili Jin
- College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
| | - Chengcheng Li
- College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
| | - Anqi Chen
- College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
| | - Zaisheng Cai
- College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
| | - Chunying Xian
- College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
| | - Yaping Zhao
- College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
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18
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Nesser H, Mahmoud HA, Lubineau G. High-Sensitivity RFID Sensor for Structural Health Monitoring. Adv Sci (Weinh) 2023; 10:e2301807. [PMID: 37407517 PMCID: PMC10502838 DOI: 10.1002/advs.202301807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 06/16/2023] [Indexed: 07/07/2023]
Abstract
Structural health monitoring (SHM) is crucial for ensuring operational safety in applications like pipelines, tanks, aircraft, ships, and vehicles. Traditional embedded sensors have limitations due to expense and potential structural damage. A novel technology using radio frequency identification devices (RFID) offers wireless transmission of highly sensitive strain measurement data. The system features a thin, flexible sensor based on an inductance-capacitance (LC) circuit with a parallel-plate capacitance sensing unit. By incorporating tailored cracks in the capacitor electrodes, the sensor's capacitor electrodes become highly piezoresistive, modifying electromagnetic wave penetration. This unconventional change in capacitance shifts the resonance frequency, resulting in a wireless strain sensor with a gauge factor of 50 for strains under 1%. The frequency shift is passively detected through an external readout system using simple frequency sweeping. This wire-free, power-free design allows easy integration into composites without compromising structural integrity. Experimental results demonstrate the cracked wireless strain sensor's ability to detect small strains within composites. This technology offers a cost-effective, non-destructive solution for accurate structural health monitoring.
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Affiliation(s)
- Hussein Nesser
- Mechanical Engineering ProgramPhysical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST), Physical Science and Engineering DivisionThuwal23955‐6900Saudi Arabia
- Mechanics of Composites for Energy and Mobility LaboratoryKing Abdullah University of Science and TechnologyThuwal23955Saudi Arabia
| | - Hassan A. Mahmoud
- Mechanical Engineering ProgramPhysical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST), Physical Science and Engineering DivisionThuwal23955‐6900Saudi Arabia
- Mechanics of Composites for Energy and Mobility LaboratoryKing Abdullah University of Science and TechnologyThuwal23955Saudi Arabia
| | - Gilles Lubineau
- Mechanical Engineering ProgramPhysical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST), Physical Science and Engineering DivisionThuwal23955‐6900Saudi Arabia
- Mechanics of Composites for Energy and Mobility LaboratoryKing Abdullah University of Science and TechnologyThuwal23955Saudi Arabia
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19
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Han S, Tan H, Wei J, Yuan H, Li S, Yang P, Mi H, Liu C, Shen C. Surface Modification of Super Arborized Silica for Flexible and Wearable Ultrafast-Response Strain Sensors with Low Hysteresis. Adv Sci (Weinh) 2023; 10:e2301713. [PMID: 37381645 PMCID: PMC10477872 DOI: 10.1002/advs.202301713] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 05/17/2023] [Indexed: 06/30/2023]
Abstract
Conductive hydrogels exhibit high potential in the fields of wearable sensors, healthcare monitoring, and e-skins. However, it remains a huge challenge to integrate high elasticity, low hysteresis, and excellent stretch-ability in physical crosslinking hydrogels. This study reports the synthesis of polyacrylamide (PAM)-3-(trimethoxysilyl) propyl methacrylate-grafted super arborized silica nanoparticle (TSASN)-lithium chloride (LiCl) hydrogel sensors with high elasticity, low hysteresis, and excellent electrical conductivity. The introduction of TSASN enhances the mechanical strength and reversible resilience of the PAM-TSASN-LiCl hydrogels by chain entanglement and interfacial chemical bonding, and provides stress-transfer centers for external-force diffusion. These hydrogels show outstanding mechanical strength (a tensile stress of 80-120 kPa, elongation at break of 900-1400%, and dissipated energy of 0.8-9.6 kJ m-3 ), and can withstand multiple mechanical cycles. LiCl addition enables the PAM-TSASN-LiCl hydrogels to exhibit excellent electrical properties with an outstanding sensing performance (gauge factor = 4.5), with rapid response (210 ms) within a wide strain-sensing range (1-800%). These PAM-TSASN-LiCl hydrogel sensors can detect various human-body movements for prolonged durations of time, and generate stable and reliable output signals. The hydrogels fabricated with high stretch-ability, low hysteresis, and reversible resilience, can be used as flexible wearable sensors.
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Affiliation(s)
- Shaowei Han
- National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Materials Processing and Mold (Ministry of Education)Zhengzhou UniversityZhengzhou450002China
| | - Huanhuan Tan
- National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Materials Processing and Mold (Ministry of Education)Zhengzhou UniversityZhengzhou450002China
| | - Jia Wei
- Yunnan Tobacco Quality Inspection and Supervision StationKunming650106China
| | - Hang Yuan
- National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Materials Processing and Mold (Ministry of Education)Zhengzhou UniversityZhengzhou450002China
| | - Songwei Li
- National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Materials Processing and Mold (Ministry of Education)Zhengzhou UniversityZhengzhou450002China
| | - Peipei Yang
- National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Materials Processing and Mold (Ministry of Education)Zhengzhou UniversityZhengzhou450002China
| | - Haoyang Mi
- National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Materials Processing and Mold (Ministry of Education)Zhengzhou UniversityZhengzhou450002China
| | - Chuntai Liu
- National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Materials Processing and Mold (Ministry of Education)Zhengzhou UniversityZhengzhou450002China
| | - Changyu Shen
- National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Materials Processing and Mold (Ministry of Education)Zhengzhou UniversityZhengzhou450002China
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20
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Paik JJ, Jang B, Nam S, Guo LJ. A Transparent Poly(vinyl alcohol) Ion-Conducting Organohydrogel for Skin-Based Strain-Sensing Applications. Adv Healthc Mater 2023; 12:e2300076. [PMID: 37221957 DOI: 10.1002/adhm.202300076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 05/15/2023] [Indexed: 05/25/2023]
Abstract
The increasing demand for cost-efficient and user-friendly wearable electronic devices has led to the development of stretchable electronics that are both cost-effective and capable of maintaining sustained adhesion and electrical performance under duress. This study reports on a novel physically crosslinked poly(vinyl alcohol) (PVA)-based hydrogel that serves as a transparent, strain-sensing skin adhesive for motion monitoring. By incorporating Zn2+ into the ice-templated PVA gel, a densified amorphous structure is observed through optical and scanning electron microscopy, and it is found that the material can stretch up to 800% strain according to tensile tests. Fabrication in a binary glycerol:water solvent results in electrical resistance in the kΩ range, a gauge factor of 0.84, and ionic conductivity on the scale of 10-4 S cm-1 , making it a potentially low-cost candidate for a stretchable electronic material. This study characterizes the relationship between improved electrical performance and polymer-polymer interactions through spectroscopic techniques, which play a role in the transport of ionic species through the material.
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Affiliation(s)
- Jennie J Paik
- Macromolecular Science and Engineering, College of Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Boonjae Jang
- Macromolecular Science and Engineering, College of Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Sunghyun Nam
- Macromolecular Science and Engineering, College of Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - L Jay Guo
- Macromolecular Science and Engineering, College of Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
- Electrical Engineering and Computer Science, College of Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
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21
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Cao J, Zhang Z, Li K, Ma C, Zhou W, Lin T, Xu J, Liu X. Self-Healable PEDOT:PSS-PVA Nanocomposite Hydrogel Strain Sensor for Human Motion Monitoring. Nanomaterials (Basel) 2023; 13:2465. [PMID: 37686973 PMCID: PMC10489763 DOI: 10.3390/nano13172465] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 08/15/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023]
Abstract
Strain sensors based on conducting polymer hydrogels are considered highly promising candidates for wearable electronic devices. However, existing conducting polymer hydrogels are susceptible to aging, damage, and failure, which can greatly deteriorate the sensing performance of strain sensors based on these substances and the accuracy of data collection under large deformation. Developing conductive polymer hydrogels with concurrent high sensing performance and self-healing capability is a critical yet challenging task to improve the stability and lifetime of strain sensors. Herein, we design a self-healable conducting polymer hydrogel by compositing poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) nanofibers and poly(vinyl alcohol) (PVA) via both physical and chemical crosslinking. This PEDOT:PSS-PVA nanocomposite hydrogel strain sensor displays an excellent strain monitoring range (>200%), low hysteresis (<1.6%), a high gauge factor (GF = 3.18), and outstanding self-healing efficiency (>83.5%). Electronic skins based on such hydrogel strain sensors can perform the accurate monitoring of various physiological signals, including swallowing, finger bending, and knee bending. This work presents a novel conducting polymer hydrogel strain sensor demonstrating both high sensing performance and self-healability, which can satisfy broad application scenarios, such as wearable electronics, health monitoring, etc.
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Affiliation(s)
- Jie Cao
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang 330013, China; (J.C.); (Z.Z.)
- School of Chemistry and Chemical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
| | - Zhilin Zhang
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang 330013, China; (J.C.); (Z.Z.)
| | - Kaiyun Li
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang 330013, China; (J.C.); (Z.Z.)
- School of Chemistry and Chemical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
| | - Cha Ma
- Key Laboratory of Organic Chemistry in Jiangxi Province, Institute of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China;
| | - Weiqiang Zhou
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang 330013, China; (J.C.); (Z.Z.)
| | - Tao Lin
- Department of Orthopedics, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Qingdao 266035, China
| | - Jingkun Xu
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang 330013, China; (J.C.); (Z.Z.)
- School of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Ximei Liu
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang 330013, China; (J.C.); (Z.Z.)
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22
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Wang T, Qiu Z, Li H, Lu H, Gu Y, Zhu S, Liu GS, Yang BR. High Sensitivity, Wide Linear-Range Strain Sensor Based on MXene/AgNW Composite Film with Hierarchical Microcrack. Small 2023:e2304033. [PMID: 37649175 DOI: 10.1002/smll.202304033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Revised: 08/02/2023] [Indexed: 09/01/2023]
Abstract
Stretchable strain sensors suffer the trade-off between sensitivity and linear sensing range. Developing sensors with both high sensitivity and wide linear range remains a formidable challenge. Different from conventional methods that rely on the structure design of sensing nanomaterial or substrate, here a heterogeneous-surface strategy for silver nanowires (AgNWs) and MXene is proposed to construct a hierarchical microcrack (HMC) strain sensor. The heterogeneous surface with distinct differences in cracks and adhesion strengths divides the sensor into two regions. One region contributes to high sensitivity through penetrating microcracks of the AgNW/MXene composite film during stretching. The other region maintains conductive percolation pathways to provide a wide linear sensing range through network microcracks. As a result, the HMC sensor exhibits ultrahigh sensitivity (gauge factor ≈ 244), broad linear range (ɛ = 60%, R2 ≈ 99.25%), and fast response time (<30 ms). These merits are confirmed in the detection of large and subtle human motions and digital joint movement for Morse coding. The manipulation of cracks on the heterogeneous surface provides a new paradigm for designing high-performance stretchable strain sensors.
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Affiliation(s)
- Ting Wang
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Zhiguang Qiu
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Haichuan Li
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Key Laboratory of Visible Light Communications of Guangzhou, Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, College of Science & Engineering, Department of Optoelectronic Engineering, Jinan University, Guangzhou, 510632, China
| | - Hao Lu
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Yifan Gu
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Simu Zhu
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Gui-Shi Liu
- Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Key Laboratory of Visible Light Communications of Guangzhou, Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, College of Science & Engineering, Department of Optoelectronic Engineering, Jinan University, Guangzhou, 510632, China
| | - Bo-Ru Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510006, China
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23
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Zhou R, Zhang Y, Xu F, Song Z, Huang J, Li Z, Gao C, He J, Gao W, Pan C. Hierarchical Synergistic Structure for High Resolution Strain Sensor with Wide Working Range. Small 2023; 19:e2301544. [PMID: 37156739 DOI: 10.1002/smll.202301544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/29/2023] [Indexed: 05/10/2023]
Abstract
Strain sensors have been attracting tremendous attention for the promising application of wearable devices in recent years. However, the trade-off between high resolution, high sensitivity, and broad detection range is a great challenge for the application of strain sensors. Herein, a novel design of hierarchical synergistic structure (HSS) of Au micro cracks and carbon black (CB) nanoparticles is reported to overcome this challenge. The strain sensor based on the designed HSS exhibit high sensitivity (GF > 2400), high strain resolution (0.2%) even under large loading strain, broad detection range (>40%), outstanding stability (>12000 cycles), and fast response speed simultaneously. Further, the experiments and simulation results demonstrate that the carbon black layer greatly changed the morphology of Au micro-cracks, forming a hierarchical structure of micro-scale Au cracks and nano-scale carbon black particles, thus enabling synergistic effect and the double conductive network of Au micro-cracks and CB nanoparticles. Based on the excellent performance, the sensor is successfully applied to monitoring tiny signals of the carotid pulse during body movement, which illustrates the great potential in the application of health monitoring, human-machine interface, human motion detection, and electronic skin.
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Affiliation(s)
- Runhui Zhou
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 101400, Beijing, P. R. China
- School of Nanoscience and Engineering, University of Chinese Academy of Sciences, 100049, Beijing, P. R. China
| | - Yufei Zhang
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 101400, Beijing, P. R. China
| | - Fan Xu
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 101400, Beijing, P. R. China
- School of Nanoscience and Engineering, University of Chinese Academy of Sciences, 100049, Beijing, P. R. China
| | - Zhuoyu Song
- Department of Engineering Mechanics, Dalian University of Technology, Dalian, Liaoning, 116024, China
| | - Jiaoya Huang
- Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning, Guangxi, 530004, P. R. China
| | - Zemin Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi, 530004, P. R. China
| | - Chen Gao
- School of Physics, University of Chinese Academy of Sciences, 100049, Beijing, P. R. China
| | - Jiang He
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 101400, Beijing, P. R. China
| | - Wenchao Gao
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 101400, Beijing, P. R. China
| | - Caofeng Pan
- CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 101400, Beijing, P. R. China
- School of Nanoscience and Engineering, University of Chinese Academy of Sciences, 100049, Beijing, P. R. China
- Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning, Guangxi, 530004, P. R. China
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24
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Kim S, Oh YS, Lee K, Kim S, Maeng WY, Kim KS, Kim GB, Cho S, Han H, Park H, Wang M, Avila R, Xie Z, Ko K, Choi J, Je M, Lee H, Lee S, Koo J, Park I. Battery-Free, Wireless, Cuff-Type, Multimodal Physical Sensor for Continuous Temperature and Strain Monitoring of Nerve. Small 2023; 19:e2206839. [PMID: 37069777 DOI: 10.1002/smll.202206839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 02/22/2023] [Indexed: 06/19/2023]
Abstract
Peripheral nerve injuries cause various disabilities related to loss of motor and sensory functions. The treatment of these injuries typically requires surgical operations for improving functional recovery of the nerve. However, capabilities for continuous nerve monitoring remain a challenge. Herein, a battery-free, wireless, cuff-type, implantable, multimodal physical sensing platform for continuous in vivo monitoring of temperature and strain from the injured nerve is introduced. The thin, soft temperature, and strain sensors wrapped around the nerve exhibit good sensitivity, excellent stability, high linearity, and minimum hysteresis in relevant ranges. In particular, the strain sensor integrated with circuits for temperature compensation provides reliable, accurate strain monitoring with negligible temperature dependence. The system enables power harvesting and data communication to wireless, multiple implanted devices wrapped around the nerve. Experimental evaluations, verified by numerical simulations, with animal tests, demonstrate the feasibility and stability of the sensor system, which has great potential for continuous in vivo nerve monitoring from an early stage to complete regeneration.
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Affiliation(s)
- Seunghwan Kim
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Yong Suk Oh
- Department of Mechanical Engineering, Changwon National University, Changwon, 51140, Republic of Korea
| | - Kwanghyoung Lee
- Department of Thoracic and Cardiovascular Surgery, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Seongchan Kim
- Center for Biomaterials, Korea Institute of Science and Technology, Seoul, 02841, Republic of Korea
| | - Woo-Youl Maeng
- School of Biomedical Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Kyung Su Kim
- School of Biomedical Engineering, Korea University, Seoul, 02841, Republic of Korea
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Republic of Korea
| | - Ga-Been Kim
- Center for Biomaterials, Korea Institute of Science and Technology, Seoul, 02841, Republic of Korea
- School of Biomedical Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Seokjoo Cho
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Hyeonseok Han
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Hyunwoo Park
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Mengqiu Wang
- State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, 116023, P. R. China
- Ningbo Institute of Dalian University of Technology, Ningbo, 315016, P. R. China
| | - Raudel Avila
- Department of Mechanical Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Zhaoqian Xie
- State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, 116023, P. R. China
- Ningbo Institute of Dalian University of Technology, Ningbo, 315016, P. R. China
- DUT-BSU Joint Institute, Dalian University of Technology, Dalian, 116023, P. R. China
| | - Kabseok Ko
- Qualcomm Institute, La Jolla, CA, 92093, USA
- Department of Electronics Engineering, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Jungrak Choi
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Minkyu Je
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Hyojin Lee
- Center for Biomaterials, Korea Institute of Science and Technology, Seoul, 02841, Republic of Korea
| | - Sungho Lee
- Department of Thoracic and Cardiovascular Surgery, Korea University College of Medicine, Seoul, 02841, Republic of Korea
| | - Jahyun Koo
- School of Biomedical Engineering, Korea University, Seoul, 02841, Republic of Korea
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, 02841, Republic of Korea
| | - Inkyu Park
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
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25
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García Díez A, Pereira N, Tubio CR, Vilas-Vilela JL, Costa CM, Lanceros-Mendez S. Magnetic Polymer Actuators with Self-Sensing Resistive Bending Response Based on Ternary Polymer Composites. ACS Appl Electron Mater 2023; 5:3426-3435. [PMID: 37396056 PMCID: PMC10308843 DOI: 10.1021/acsaelm.3c00432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Accepted: 05/17/2023] [Indexed: 07/04/2023]
Abstract
A multifunctional polymer-based composite has been designed based on poly(vinylidene fluoride) (PVDF) as polymer matrix and cobalt ferrite (CoFe2O4, CFO) and multiwalled carbon nanotubes (MWCNTs) as fillers, allowing to combine magnetic and electrical responses. The composites were prepared by solvent casting with a fixed 20 wt % concentration of CFO and varying the MWCNTs content between 0 and 3 wt %, allowing to tailor the electrical behavior. The morphology, polymer phase, and thermal and magnetic properties are nearly independent of the MWCNT filler content within the polymer matrix. On the other hand, the mechanical and electrical properties strongly depend on the MWCNT content and a maximum d.c. electrical conductivity value of 4 × 10-4 S·cm-1 has been obtained for the 20 wt %CFO-3 wt %MWCNT/PVDF sample, which is accompanied by an 11.1 emu·g-1 magnetization. The suitability of this composite for magnetic actuators with self-sensing strain characteristics is demonstrated with excellent response and reproducibility.
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Affiliation(s)
- Ander García Díez
- BCMaterials,
Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain
| | - Nelson Pereira
- Centre
of Physics Universities of Minho and Porto and Laboratory of Physics
for Materials and Emergent Technologies, LapMET, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Carmen R. Tubio
- BCMaterials,
Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain
| | - Jose Luis Vilas-Vilela
- BCMaterials,
Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apdo. 644, 48080 Bilbao, Spain
| | - Carlos M. Costa
- Centre
of Physics Universities of Minho and Porto and Laboratory of Physics
for Materials and Emergent Technologies, LapMET, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Senentxu Lanceros-Mendez
- BCMaterials,
Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain
- Centre
of Physics Universities of Minho and Porto and Laboratory of Physics
for Materials and Emergent Technologies, LapMET, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
- Ikerbasque,
Basque Foundation for Science, 48009 Bilbao, Spain
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26
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Vural M, Mohammadi M, Seufert L, Han S, Crispin X, Fridberger A, Berggren M, Tybrandt K. Soft Electromagnetic Vibrotactile Actuators with Integrated Vibration Amplitude Sensing. ACS Appl Mater Interfaces 2023. [PMID: 37327497 DOI: 10.1021/acsami.3c05045] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Soft vibrotactile devices have the potential to expand the functionality of emerging electronic skin technologies. However, those devices often lack the necessary overall performance, sensing-actuation feedback and control, and mechanical compliance for seamless integration on the skin. Here, we present soft haptic electromagnetic actuators that consist of intrinsically stretchable conductors, pressure-sensitive conductive foams, and soft magnetic composites. To minimize joule heating, high-performance stretchable composite conductors are developed based on in situ-grown silver nanoparticles formed within the silver flake framework. The conductors are laser-patterned to form soft and densely packed coils to further minimize heating. Soft pressure-sensitive conducting polymer-cellulose foams are developed and integrated to tune the resonance frequency and to provide internal resonator amplitude sensing in the resonators. The above components together with a soft magnet are assembled into soft vibrotactile devices providing high-performance actuation combined with amplitude sensing. We believe that soft haptic devices will be an essential component in future developments of multifunctional electronic skin for future human-computer and human-robotic interfaces.
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Affiliation(s)
- Mert Vural
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 602 21 Norrköping, Sweden
- Wallenberg Wood Science Center, ITN, Linköping University, 602 21 Norrköping, Sweden
| | - Mohsen Mohammadi
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 602 21 Norrköping, Sweden
- Wallenberg Wood Science Center, ITN, Linköping University, 602 21 Norrköping, Sweden
| | - Laura Seufert
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 602 21 Norrköping, Sweden
| | - Shaobo Han
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 602 21 Norrköping, Sweden
| | - Xavier Crispin
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 602 21 Norrköping, Sweden
- Wallenberg Wood Science Center, ITN, Linköping University, 602 21 Norrköping, Sweden
| | - Anders Fridberger
- Department of Biomedical and Clinical Sciences, Linköping University, 581 83 Linköping, Sweden
| | - Magnus Berggren
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 602 21 Norrköping, Sweden
- Wallenberg Wood Science Center, ITN, Linköping University, 602 21 Norrköping, Sweden
| | - Klas Tybrandt
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, 602 21 Norrköping, Sweden
- Wallenberg Wood Science Center, ITN, Linköping University, 602 21 Norrköping, Sweden
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27
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Nikitina NA, Ryabkin DI, Suchkova VV, Kuksin AV, Pyankov ES, Ichkitidze LP, Maksimkin AV, Kitsyuk EP, Gerasimenko EA, Telyshev DV, Bobrinetskiy I, Selishchev SV, Gerasimenko AY. Laser-Formed Sensors with Electrically Conductive MWCNT Networks for Gesture Recognition Applications. Micromachines (Basel) 2023; 14:1106. [PMID: 37374691 DOI: 10.3390/mi14061106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 05/21/2023] [Accepted: 05/22/2023] [Indexed: 06/29/2023]
Abstract
Currently, an urgent need in the field of wearable electronics is the development of flexible sensors that can be attached to the human body to monitor various physiological indicators and movements. In this work, we propose a method for forming an electrically conductive network of multi-walled carbon nanotubes (MWCNT) in a matrix of silicone elastomer to make stretchable sensors sensitive to mechanical strain. The electrical conductivity and sensitivity characteristics of the sensor were improved by using laser exposure, through the effect of forming strong carbon nanotube (CNT) networks. The initial electrical resistance of the sensors obtained using laser technology was ~3 kOhm (in the absence of deformation) at a low concentration of nanotubes of 3 wt% in composition. For comparison, in a similar manufacturing process, but without laser exposure, the active material had significantly higher values of electrical resistance, which was ~19 kOhm in this case. The laser-fabricated sensors have a high tensile sensitivity (gauge factor ~10), linearity of >0.97, a low hysteresis of 2.4%, tensile strength of 963 kPa, and a fast strain response of 1 ms. The low Young's modulus values of ~47 kPa and the high electrical and sensitivity characteristics of the sensors made it possible to fabricate a smart gesture recognition sensor system based on them, with a recognition accuracy of ~94%. Data reading and visualization were performed using the developed electronic unit based on the ATXMEGA8E5-AU microcontroller and software. The obtained results open great prospects for the application of flexible CNT sensors in intelligent wearable devices (IWDs) for medical and industrial applications.
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Affiliation(s)
- Natalia A Nikitina
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
| | - Dmitry I Ryabkin
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
| | - Victoria V Suchkova
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
| | - Artem V Kuksin
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
| | - Evgeny S Pyankov
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
| | - Levan P Ichkitidze
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
| | - Aleksey V Maksimkin
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
| | - Evgeny P Kitsyuk
- Scientific-Manufacturing Complex "Technological Centre", Shokin Square 1, bld. 7 off. 7237, 124498 Moscow, Russia
| | - Ekaterina A Gerasimenko
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
| | - Dmitry V Telyshev
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
| | - Ivan Bobrinetskiy
- Center for Probe Microscopy and Nanotechnology, National Research University of Electronic Technology, 124498 Moscow, Russia
| | - Sergey V Selishchev
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
| | - Alexander Yu Gerasimenko
- Institute of Biomedical Systems, National Research University of Electronic Technology, 124498 Moscow, Russia
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
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28
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Dittel G, Cicek IE, Bredol M, Gries T. Carbon Rovings as Strain Sensor in TRC Structures: Effect of Roving Cross-Sectional Shape and Coating Material on the Electrical Response under Bending Stress. Sensors (Basel) 2023; 23:4601. [PMID: 37430514 DOI: 10.3390/s23104601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/28/2023] [Accepted: 05/05/2023] [Indexed: 07/12/2023]
Abstract
This study investigated the ability of electrically conductive carbon rovings to detect cracks in textile-reinforced concrete (TRC) structures. The key innovation lies in the integration of carbon rovings into the reinforcing textile, which not only contributes to the mechanical properties of the concrete structure but also eliminates the need for an additional sensory system, such as strain gauges, to monitor the structural health. Carbon rovings are integrated into a grid-like textile reinforcement that differs in binding type and dispersion concentration of the styrene butadiene rubber (SBR) coating. Ninety final samples were subjected to a four-point bending test in which the electrical changes of the carbon rovings were measured simultaneously to capture the strain. The mechanical results show that the SBR50-coated TRC samples with circular and elliptical cross-sectional shape achieved, with 1.55 kN, the highest bending tensile strength, which is also captured with a value of 0.65 Ω by the electrical impedance monitoring. The elongation and fracture of the rovings have a significant effect on the impedance mainly due to electrical resistance change. A correlation was found between the impedance change, binding type and coating. This suggests that the elongation and fracture mechanisms are affected by the number of outer and inner filaments, as well as the coating.
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Affiliation(s)
- Gözdem Dittel
- Institut für Textiltechnik of RWTH Aachen University, 52074 Aachen, Germany
| | - Irem Ecem Cicek
- Department of Chemical Engineering, FH Münster University of Applied Sciences, 48565 Steinfurt, Germany
| | - Michael Bredol
- Department of Chemical Engineering, FH Münster University of Applied Sciences, 48565 Steinfurt, Germany
| | - Thomas Gries
- Institut für Textiltechnik of RWTH Aachen University, 52074 Aachen, Germany
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29
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Yu H, Zhuang Q, Lin J, Chen Z, Chen Z, Wang Z, Zhou G, Zhang S, Lai Y, Wu D. One-step fabrication of high-performance graphene composites from graphite solution for bio-scaffolds and flexible strain sensors. Nanotechnology 2023; 34. [PMID: 37137299 DOI: 10.1088/1361-6528/acd1f4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 05/03/2023] [Indexed: 05/05/2023]
Abstract
Graphene composites possess great application potential in various fields including flexible electrodes, wearable sensors and biomedical devices owing to their excellent mechanical and electrical properties. However, it remains challenging to fabricate graphene composites-based devices with high consistency due to the gradual aggression effect of graphene during fabrication process. Herein, we propose a method for one-step fabricating graphene / polymer composite-based devices from graphite / polymer solution by using electrohydrodynamic printing (EHD) with the Weissenberg effect (EPWE). Taylor-Couette flows with high shearing speed were generated to exfoliate high-quality graphene with a rotating steel microneedle coaxially set in a spinneret tube. The effects of the rotating speed of the needle, spinneret size and precursor ingredients on the graphene concentration were discussed. As a proof of concept, EPGW was used to successfully fabricate graphene / PCL bio-scaffolds with good biocompatibility and graphene / TPU strain sensor for detecting human motions with a maximum gauge factor more than 2400 from 40 to 50% strain. As such, this method sheds a new light on one-step in situ fabrication of graphene / polymer composite based devices from graphite solution with low cost.
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Affiliation(s)
- Hang Yu
- Department of Mechanical and Electrical Engineering, Xiamen University, No.422 Xiang'an South Road, Xiang'an District, Xiamen, Fujian Province, Xiamen, 361005, CHINA
| | - Qibin Zhuang
- Department of Mechanical and Electrical Engineering, Xiamen University, No.422 Xiang'an South Road, Xiang'an District, Xiamen, Fujian Province, Xiamen, 361005, CHINA
| | - Jiawei Lin
- Department of Mechanical and Electrical Engineering, Xiamen University, No.422 Xiang'an South Road, Xiang'an District, Xiamen City, Fujian Province, Xiamen, 361005, CHINA
| | - Zhuo Chen
- Department of Mechanical and Electrical Engineering, Xiamen University, No.422 Xiang'an South Road, Xiang'an District, Xiamen, Fujian Province, Xiamen, 361005, CHINA
| | - Zhiwen Chen
- Department of Mechanical and Electrical Engineering, Xiamen University, No.422 Xiang'an South Road, Xiang'an District, Xiamen, Fujian Province, Xiamen, 361005, CHINA
| | - Zhongbao Wang
- Xiamen University, No.422 Xiang'an South Road, Xiang'an District, Xiamen, Fujian Province, Xiamen, 361005, CHINA
| | - Gang Zhou
- Transmission Mechanisms Beijing Institute of Control Engineering, No.104, Youyi Road, Haidian, Beijing, Beijing, 100094, CHINA
| | - Shaohua Zhang
- Transmission Mechanisms Beijing Institute of Control Engineering, No.104, Youyi Road, Haidian, Beijing, Beijing, 100094, CHINA
| | - Yingzhen Lai
- Department of Stomatology, Xiamen Medical College, No.1999, Gunkou Middle Road, Jimei, Xiamen, Fujian Province, Xiamen, 361023, CHINA
| | - Dezhi Wu
- Department of Mechanical and Electrical Engineering, Xiamen University, No.422 Xiang'an South Road, Xiang'an District, Xiamen, Fujian Province, Xiamen, 361005, CHINA
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30
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Leber A, Laperrousaz S, Qu Y, Dong C, Richard I, Sorin F. Thermally Drawn Elastomer Nanocomposites for Soft Mechanical Sensors. Adv Sci (Weinh) 2023; 10:e2207573. [PMID: 36852621 PMCID: PMC10161033 DOI: 10.1002/advs.202207573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/02/2023] [Indexed: 05/06/2023]
Abstract
Stretchable and conductive nanocomposites are emerging as important constituents of soft mechanical sensors for health monitoring, human-machine interactions, and soft robotics. However, tuning the materials' properties and sensor structures to the targeted mode and range of mechanical stimulation is limited by current fabrication approaches, particularly in scalable polymer melt techniques. Here, thermoplastic elastomer-based nanocomposites are engineered and novel rheological requirements are proposed for their compatibility with fiber processing technologies, yielding meters-long, soft, and highly versatile stretchable fiber devices. Based on microstructural changes in the nanofiller arrangement, the resistivity of the nanocomposite is tailored in its final device architecture across an entire order of magnitude as well as its sensitivity to strain via tuning thermal drawing processing parameters alone. Moreover, the prescribed electrical properties are coupled with suitable device designs and several fiber-based sensors are proposed aimed at specific types of deformations: i) a robotic fiber with an integrated bending mechanism where changes as small as 5° are monitored by piezoresistive nanocomposite elements, ii) a pressure-sensing fiber based on a geometrically controlled resistive signal that responds with a sub-newton resolution to changes in pressing forces, and iii) a strain-sensing fiber that tracks changes in capacitance up to 100% elongation.
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Affiliation(s)
- Andreas Leber
- Institute of Materials, École polytechnique fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Stella Laperrousaz
- Institute of Materials, École polytechnique fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Yunpeng Qu
- Institute of Materials, École polytechnique fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Chaoqun Dong
- Institute of Materials, École polytechnique fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Inès Richard
- Institute of Materials, École polytechnique fédérale de Lausanne, Lausanne, 1015, Switzerland
| | - Fabien Sorin
- Institute of Materials, École polytechnique fédérale de Lausanne, Lausanne, 1015, Switzerland
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31
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Lan MH, Guan X, Zhu DY, Chen ZP, Liu T, Tang Z. Highly Elastic, Self-Healing, Recyclable Interlocking Double-Network Liquid-Free Ionic Conductive Elastomers via Facile Fabrication for Wearable Strain Sensors. ACS Appl Mater Interfaces 2023; 15:19447-19458. [PMID: 37037788 DOI: 10.1021/acsami.3c01585] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Liquid-free ionic conductive elastomers (ICEs) are ideal materials for wearable strain sensors in increasingly flexible electronic devices. However, developing recyclable ICEs with high elasticity, self-healability, and recyclability is still a great challenge. In this study, we fabricated a series of novel ICEs by in situ polymerization of lipoic acid (LA) in poly(acrylic acid) (PAA) solution and cross-linking by coordination bonding and hydrogen bonding. One of the obtained dynamically cross-linked interlocking double-network ICEs, PLA-PAA4-1% ICE, showed excellent mechanical properties, with high elasticity (90%) and stretchability (610%), as well as rapid self-healability (mechanical self-healing within 2 h and electrical recovery within 0.3 s). The PLA-PAA4-1% ICE was used as a strain sensor and possessed excellent linear sensitivity and highly cyclic stability, effectively monitoring diverse human motions with both stretched and compressed deformations. Notably, the PLA-PAA4-1% ICE can be fully recycled and reused as a new strain sensor without any structure change or degradation in performance. This work provided a viable path to fabricate conductive materials by solving the two contradictions of high mechanical property and self-healability, and structure stability and recyclability. We believe that the superior overall performance and feasible fabrication make the developed PLA-PAA4-1% ICE hold great promise as a multifunctional strain sensor for practical applications in flexible wearable electronic devices and humanoid robotics.
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Affiliation(s)
- Ming Hui Lan
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
| | - Xiaoxiao Guan
- China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou, Guangdong 510507, P. R. China
| | - Dong Yu Zhu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
- Guangdong Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang 515200, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
| | - Zhi Peng Chen
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
| | - Tingsu Liu
- School of Physics and Optoeletronic Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
| | - Zhenhua Tang
- School of Physics and Optoeletronic Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, P. R. China
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32
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Karlapudi MC, Vahdani M, Bandari SM, Peng S, Wu S. A Comparative Study on the Effects of Spray Coating Methods and Substrates on Polyurethane/Carbon Nanofiber Sensors. Sensors (Basel) 2023; 23:3245. [PMID: 36991956 PMCID: PMC10054467 DOI: 10.3390/s23063245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 03/15/2023] [Accepted: 03/17/2023] [Indexed: 06/19/2023]
Abstract
Thermoplastic polyurethane (TPU) has been widely used as the elastic polymer substrate to be combined with conductive nanomaterials to develop stretchable strain sensors for a variety of applications such as health monitoring, smart robotics, and e-skins. However, little research has been reported on the effects of deposition methods and the form of TPU on their sensing performance. This study intends to design and fabricate a durable, stretchable sensor based on composites of thermoplastic polyurethane and carbon nanofibers (CNFs) by systematically investigating the influences of TPU substrates (i.e., either electrospun nanofibers or solid thin film) and spray coating methods (i.e., either air-spray or electro-spray). It is found that the sensors with electro-sprayed CNFs conductive sensing layers generally show a higher sensitivity, while the influence of the substrate is not significant and there is no clear and consistent trend. The sensor composed of a TPU solid thin film with electro-sprayed CNFs exhibits an optimal performance with a high sensitivity (gauge factor ~28.2) in a strain range of 0-80%, a high stretchability of up to 184%, and excellent durability. The potential application of these sensors in detecting body motions has been demonstrated, including finger and wrist-joint movements, by using a wooden hand.
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Affiliation(s)
| | - Mostafa Vahdani
- School of Engineering, Macquarie University, Sydney, NSW 2109, Australia
| | | | - Shuhua Peng
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Shuying Wu
- School of Engineering, Macquarie University, Sydney, NSW 2109, Australia
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia
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33
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Abstract
Piezoionic strain sensors have attracted enormous attention in artificial skin perception because of high sensitivity, lightweight, and flexibility. However, their sensing properties are limited by a weak material interface based on physical adhesion, which usually leads to fast performance deterioration under mechanical conditions. In this work, a bio-inspired interface has been reported based on an in situ growth strategy and then utilized for piezoionic sensor assembly. The robust coupling interface provides fast kinetic of ion transfer and prevents interface slippage under external strains. The as-fabricated sensors give high sensing voltage with high sensitivity. It delivers excellent cycling stability with performance retention above 90% over thousands of bending cycles in air. Further, the sensors have been explored as an effective platform for skin perception, and many detections can be realized within our devices, such as skin touch, eye movement, cheek bulging, and finger movement.
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Affiliation(s)
- Chao Lu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China
| | - Xi Chen
- Department of Earth and Environmental Engineering, Columbia University, New York, New York 10027, United States
| | - Xiaohong Zhang
- Institute of Functional Nano & Soft Materials, Soochow University, Suzhou, Jiangsu 215123, China
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34
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Liu Y, Feng H, Gui Y, Chen T, Xu H, Huang X, Ma X. Flexible Stretchable, Dry-Resistant MXene Nanocomposite Conductive Hydrogel for Human Motion Monitoring. Polymers (Basel) 2023; 15:polym15020250. [PMID: 36679131 PMCID: PMC9864371 DOI: 10.3390/polym15020250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 12/17/2022] [Accepted: 12/26/2022] [Indexed: 01/06/2023] Open
Abstract
Conductive hydrogels with high electrical conductivity, ductility, and anti-dryness have promising applications in flexible wearable electronics. However, its potential applications in such a developing field are severely hampered by its extremely poor adaptability to cold or hot environmental conditions. In this research, an "organic solvent/water" composite conductive hydrogel is developed by introducing a binary organic solvent of EG/H2O into the system using a simple one-pot free radical polymerization method to create Ti3C2TX MXene nanosheet-reinforced polyvinyl alcohol/polyacrylamide covalently networked nanocomposite hydrogels (PAEM) with excellent flexibility and mechanical properties. The optimized PAEM contains 0.3 wt% MXene has excellent mechanical performance (tensile elongation of ~1033%) and an improved modulus of elasticity (0.14 MPa), a stable temperature tolerance from -50 to 40 °C, and a high gauge factor of 10.95 with a long storage period and response time of 110 ms. Additionally, it is worth noting that the elongation at break at -40 °C was maintained at around 50% of room temperature. This research will contribute to the development of flexible sensors for human-computer interaction, electronic skin, and human health monitoring.
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Affiliation(s)
- Yafei Liu
- School of Petroleum and Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Huixia Feng
- School of Petroleum and Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
- Correspondence:
| | - Yujie Gui
- School of Petroleum and Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Ting Chen
- School of Petroleum and Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Haidong Xu
- School of Chemistry and Chemical Engineering, Normal College for Nationalities, Qinghai Normal University, Xining 810008, China
| | - Xiaoxue Huang
- School of Petroleum and Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Xuemei Ma
- School of Petroleum and Chemical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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35
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Zhang Y, Zhao D, Cao L, Fan L, Lin A, Wang S, Gu F, Yu A. Droplets Patterning of Structurally Integrated 3D Conductive Networks-Based Flexible Strain Sensors for Healthcare Monitoring. Nanomaterials (Basel) 2022; 13:181. [PMID: 36616092 PMCID: PMC9824308 DOI: 10.3390/nano13010181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/19/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
Flexible strain sensors with significant extensibility, stability, and durability are essential for public healthcare due to their ability to monitor vital health signals noninvasively. However, thus far, the conductive networks have been plagued by the inconsistent interface states of the conductive components, which hampered the ultimate sensitivity performance. Here, we demonstrate structurally integrated 3D conductive networks-based flexible strain sensors of hybrid Ag nanorods/nanoparticles(AgNRs/NPs) by combining a droplet-based aerosol jet printing(AJP) process and a feasible transfer process. Structurally integrated 3D conductive networks have been intentionally developed by tweaking droplets deposition behaviors at multi-scale for efficient hybridization and ordered assembly of AgNRs/NPs. The hybrid AgNRs/NPs enhance interfacial conduction and mechanical properties during stretching. In a strain range of 25%, the developed sensor demonstrates an ideal gauge factor of 23.18. When real-time monitoring of finger bending, arm bending, squatting, and vocalization, the fabricated sensors revealed effective responses to human movements. Our findings demonstrate the efficient droplet-based AJP process is particularly capable of developing advanced flexible devices for optoelectronics and wearable electronics applications.
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Affiliation(s)
- Yang Zhang
- Laboratory of Advanced Materials and Manufacturing (LAMM), Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China
| | - Danjiao Zhao
- Laboratory of Advanced Materials and Manufacturing (LAMM), Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China
| | - Lei Cao
- Laboratory of Advanced Materials and Manufacturing (LAMM), Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China
| | - Lanlan Fan
- Laboratory of Advanced Materials and Manufacturing (LAMM), Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China
| | - Aiping Lin
- Laboratory of Advanced Materials and Manufacturing (LAMM), Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China
| | - Shufen Wang
- Laboratory of Advanced Materials and Manufacturing (LAMM), Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China
| | - Feng Gu
- Laboratory of Advanced Materials and Manufacturing (LAMM), Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China
- Institute for Process Modelling and Optimization, Jiangsu Industrial Technology Research Institute, Suzhou 215123, China
| | - Aibing Yu
- Laboratory of Advanced Materials and Manufacturing (LAMM), Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China
- Department of Chemical Engineering, Monash University, Melbourne, VIC 3800, Australia
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36
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Pinheiro T, Correia R, Morais M, Coelho J, Fortunato E, Sales MGF, Marques AC, Martins R. Water Peel-Off Transfer of Electronically Enhanced, Paper-Based Laser-Induced Graphene for Wearable Electronics. ACS Nano 2022; 16:20633-20646. [PMID: 36383513 PMCID: PMC9798867 DOI: 10.1021/acsnano.2c07596] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 10/03/2022] [Indexed: 06/09/2023]
Abstract
Laser-induced graphene (LIG) has gained preponderance in recent years, as a very attractive material for the fabrication and patterning of graphitic structures and electrodes, for multiple applications in electronics. Typically, polymeric substrates, such as polyimide, have been used as precursor materials, but other organic, more sustainable, and accessible precursor materials have emerged as viable alternatives, including cellulose substrates. However, these substrates have lacked the conductive and chemical properties achieved by conventional LIG precursor substrates and have not been translated into fully flexible, wearable scenarios. In this work, we expand the conductive properties of paper-based LIG, by boosting the graphitization potential of paper, through the introduction of external aromatic moieties and meticulous control of laser fluence. Colored wax printing over the paper substrates introduces aromatic chemical structures, allowing for the synthesis of LIG chemical structures with sheet resistances as low as 5 Ω·sq-1, translating to an apparent conductivity as high as 28.2 S·cm-1. Regarding chemical properties, ID/IG ratios of 0.28 showcase low defect densities of LIG chemical structures and improve on previous reports on paper-based LIG, where sheet resistance has been limited to values around 30 Ω·sq-1, with more defect dense and less crystalline chemical structures. With these improved properties, a simple transfer methodology was developed, based on a water-induced peel-off process that efficiently separates patterned LIG structures from the native paper substrates to conformable, flexible substrates, harnessing the multifunctional capabilities of LIG toward multiple applications in wearable electronics. Proof-of concept electrodes for electrochemical sensors, strain sensors, and in-plane microsupercapacitors were patterned, transferred, and characterized, using paper as a high-value LIG precursor for multiples scenarios in wearable technologies, for improved sustainability and accessibility of such applications.
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Affiliation(s)
- Tomás Pinheiro
- CENIMAT|i3N,
Departamento de Ciência de Materiais, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa
and CEMOP/UNINOVA, Campus da Caparica, 2829-516Caparica, Portugal
- BioMark@UC,
Department of Chemical Engineering, Faculty of Science and Technology, Coimbra University, 3030-790, Coimbra, Portugal
| | - Ricardo Correia
- CENIMAT|i3N,
Departamento de Ciência de Materiais, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa
and CEMOP/UNINOVA, Campus da Caparica, 2829-516Caparica, Portugal
| | - Maria Morais
- CENIMAT|i3N,
Departamento de Ciência de Materiais, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa
and CEMOP/UNINOVA, Campus da Caparica, 2829-516Caparica, Portugal
| | - João Coelho
- CENIMAT|i3N,
Departamento de Ciência de Materiais, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa
and CEMOP/UNINOVA, Campus da Caparica, 2829-516Caparica, Portugal
| | - Elvira Fortunato
- CENIMAT|i3N,
Departamento de Ciência de Materiais, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa
and CEMOP/UNINOVA, Campus da Caparica, 2829-516Caparica, Portugal
| | - M. Goreti F. Sales
- BioMark@UC,
Department of Chemical Engineering, Faculty of Science and Technology, Coimbra University, 3030-790, Coimbra, Portugal
- CEB
− Centre of Biological Engineering, University of Minho, 4710-057, Braga, Portugal
| | - Ana C. Marques
- CENIMAT|i3N,
Departamento de Ciência de Materiais, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa
and CEMOP/UNINOVA, Campus da Caparica, 2829-516Caparica, Portugal
| | - Rodrigo Martins
- CENIMAT|i3N,
Departamento de Ciência de Materiais, Faculdade de Ciências
e Tecnologia, Universidade Nova de Lisboa
and CEMOP/UNINOVA, Campus da Caparica, 2829-516Caparica, Portugal
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37
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Tran VV, Lee K, Nguyen TN, Lee D. Recent Advances and Progress of Conducting Polymer-Based Hydrogels in Strain Sensor Applications. Gels 2022; 9. [PMID: 36661780 DOI: 10.3390/gels9010012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/16/2022] [Accepted: 12/21/2022] [Indexed: 12/28/2022] Open
Abstract
Conducting polymer-based hydrogels (CPHs) are novel materials that take advantage of both conducting polymers and three-dimensional hydrogels, which endow them with great electrical properties and excellent mechanical features. Therefore, CPHs are considered as one of the most promising platforms for employing wearable and stretchable strain sensors in practical applications. Herein, we provide a critical review of distinct features and preparation technologies and the advancements in CPH-based strain sensors for human motion and health monitoring applications. The fundamentals, working mechanisms, and requirements for the design of CPH-based strain sensors with high performance are also summarized and discussed. Moreover, the recent progress and development strategies for the implementation of CPH-based strain sensors are pointed out and described. It has been surmised that electronic skin (e-skin) sensors are the upward tendency in the development of CPHs for wearable strain sensors and human health monitoring. This review will be important scientific evidence to formulate new approaches for the development of CPH-based strain sensors in the present and in the future.
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38
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Rong J, Zhou J, Zhou Y, Hu C, Li L, Guo W. 3D Single-Layer-Dominated Graphene Foam for High-Resolution Strain Sensing and Self-Monitoring Shape Memory Composite. Small 2022; 18:e2205301. [PMID: 36319465 DOI: 10.1002/smll.202205301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/15/2022] [Indexed: 06/16/2023]
Abstract
Flexible intelligent materials are desired to effectively regulate their own deformation and accurately sense their immediate morphology at the same time. Graphene foam is an attractive material for strain sensing and electrical/thermal performance control due to its outstanding mechanical, electrical, and thermal properties. However, graphene-foam-based materials with both strain sensing and deformation control capabilities are rarely reported. Here, a multiscale design of graphene foam with a single-layer-graphene-dominated microstructure and resilient 3D network architecture, which leads to exceptional strain sensing performance as well as modulation ability of the electrical and thermal conductivity for shape memory polymers, is reported. The graphene foams exhibit a strain detection limit of 0.033%, a rapid response of 53 ms, long-term stability over 10 000 cycles, significant thermoacoustic effect, and great heat-generation and heat-diffusion ability. By combining these advantages, an electro-activated shape-memory composite that is capable of monitoring its own shape state during its morphing process, is demonstrated.
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Affiliation(s)
- Jiasheng Rong
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
| | - Jianxin Zhou
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
| | - Yucheng Zhou
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
| | - Cong Hu
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
| | - Luxian Li
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
| | - Wanlin Guo
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of the MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P. R. China
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39
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Zhang K, Jiang W, Li X, Gao X. Highly stretchable and sensitive strain sensors based on modified PDMS and hybrid particles of AgNWs/graphene. Nanotechnology 2022; 34:06LT01. [PMID: 36356306 DOI: 10.1088/1361-6528/aca1ca] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
High-performance strain sensors have received extensive attention due to their wide range of applications in pulsebeat detection, speech recognition, motion detection, and blood pressure monitoring. However, it is difficult to simultaneously attain high sensitivity and excellent stretchability. In this work, a strain sensor based on modified polydimethylsiloxane (PDMS) and conductive hybrid particles of silver nanowires (AgNWs)/graphene was successfully fabricated. A facile solvothermal polymerization process was used to change the structure of cross-linking networks and to obtain the PDMS elastomer with excellent stretchability. The application of the modified PDMS endows the strain sensor with a large strain range (∼20%), which is 100% higher than that of the strain sensor with unmodified PDMS. The AgNWs/graphene hybrid particles were prepared by a simple coprecipitation, reduction, and drying method. AgNWs serve as bridges between graphene sheets, endowing the strain sensor with a large gauge factor (GF = 400). The stability of the strain sensor was also verified. Besides, the strain sensor was successfully used in fields such as finger bending and speech recognition. Considering its high sensitivity, excellent stretchability, and high working stability, the sensor has great potential in health monitoring and motion detection.
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Affiliation(s)
- Kaili Zhang
- Shanxi Bethune Hospital, Shanxi Academy of medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, 030032, People's Republic of China
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Wenshuai Jiang
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai University, Tianjin, 300071 People's Republic of China
| | - Xiaokuan Li
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai University, Tianjin, 300071 People's Republic of China
| | - Xiaoguang Gao
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Nankai University, Tianjin, 300071 People's Republic of China
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Bai D, Liu F, Xie D, Lv F, Shen L, Tian Z. 3D printing of flexible strain sensor based on MWCNTs/flexible resin composite. Nanotechnology 2022; 34:045701. [PMID: 36265436 DOI: 10.1088/1361-6528/ac9c0b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
The flexible strain sensor is an indispensable part in flexible integrated electronic systems and an important intermediate in external mechanical signal acquisition. The 3D printing technology provides a fast and cheap way to manufacture flexible strain sensors. In this paper, a MWCNTs/flexible resin composite for photocuring 3D printing was prepared using mechanical mixing method. The composite has a low percolation threshold (1.2%ωt). Based on the composite material, a flexible strain sensor with high performance was fabricated using digital light processing technology. The sensor has a GF of 8.98 under strain conditions ranging between 0% and 40% and a high elongation at break (48%). The sensor presents mechanical hysteresis under cyclic loading. With the increase of the strain amplitude, the mechanical hysteresis becomes more obvious. At the same time, the resistance response signal of the sensor shows double peaks during the unloading process, which is caused by the competition of disconnection and reconstruction of conductive network in the composite material. The test results show that the sensor has different response signals to different types of loads. Finally, its practicability is verified by applying it to balloon pressure detection.
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Affiliation(s)
- Dezhi Bai
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China
| | - Fuxi Liu
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China
- Nanjing HANGPU Machinery Technology Co. Ltd, Nanjing 210016, People's Republic of China
- JITRI Institute of Precision Manufacturing, Nanjing 211806, People's Republic of China
| | - Deqiao Xie
- College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China
| | - Fei Lv
- Laboratory of High Power Fiber Laser Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, People's Republic of China
| | - Lida Shen
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China
| | - Zongjun Tian
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China
- Nanjing HANGPU Machinery Technology Co. Ltd, Nanjing 210016, People's Republic of China
- JITRI Institute of Precision Manufacturing, Nanjing 211806, People's Republic of China
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41
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Liu D, Zhou H, Zhao Y, Huyan C, Wang Z, Torun H, Guo Z, Dai S, Xu BB, Chen F. A Strand Entangled Supramolecular PANI/PAA Hydrogel Enabled Ultra-Stretchable Strain Sensor. Small 2022; 18:e2203258. [PMID: 36216591 DOI: 10.1002/smll.202203258] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 09/02/2022] [Indexed: 06/16/2023]
Abstract
Hydrogel electronics have attracted growing interest for emerging applications in personal healthcare management, human-machine interaction, etc. Herein, a "doping then gelling" strategy to synthesize supramolecular PANI/PAA hydrogel with a specific strand entangled network is proposed, by doping the PANI with acrylic acid (AA) monomers to avoid PANI aggregation. The high-density electrostatic interaction between PAA and PANI chains serves as a dynamic bond to initiate the strand entanglement, enabling PAA/PANI hydrogel with ultra-stretchability (2830%), high breaking strength (120 kPa), and rapid self-healing properties. Moreover, the PAA/PANI hydrogel-based sensor with a high strain sensitivity (gauge factor = 12.63), a rapid responding time (222 ms), and a robust conductivity-based sensing behavior under cyclic stretching is developed. A set of strain sensing applications to precisely monitor human movements is also demonstrated, indicating a promising application prospect as wearable devices.
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Affiliation(s)
- Dong Liu
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Honghao Zhou
- Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Yuanyuan Zhao
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
- The 41 st Institute of the Forth Academy, China Aerospace Science and Technology Corporation, Xi'an, 710025, P. R. China
| | - Chenxi Huyan
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Zibi Wang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
| | - Hamdi Torun
- Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Zhanhu Guo
- Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Sheng Dai
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK
| | - Ben Bin Xu
- Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Fei Chen
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China
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Wang Z, Lai YC, Chiang YT, Scheiger JM, Li S, Dong Z, Cai Q, Liu S, Hsu SH, Chou CC, Levkin PA. Tough, Self-Healing, and Conductive Elastomer ─Ionic PEGgel. ACS Appl Mater Interfaces 2022; 14:50152-50162. [PMID: 36306446 DOI: 10.1021/acsami.2c14394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Ionically conductive elastomers are necessary for realizing human-machine interfaces, bioelectronic applications, or durable wearable sensors. Current design strategies, however, often suffer from solvent leakage and evaporation, or from poor mechanical properties. Here, we report a strategy to fabricate ionic elastomers (IHPs) demonstrating high conductivity (0.04 S m-1), excellent electrochemical stability (>60,000 cycles), ultra-stretchability (up to 1400%), high toughness (7.16 MJ m-3), and fast self-healing properties, enabling the restoration of ionic conductivity within seconds, as well as no solvent leakage. The ionic elastomer is composed of in situ formed physically cross-linked poly(2-hydroxyethyl methacrylate) networks and poly(ethylene glycol) (PEG). The long molecular chains of PEG serve as a solvent for dissolving electrolytes, improve its long-term stability, reduce solvent leakage, and ensure the outstanding mechanical properties of the IHP. Surprisingly, the incorporation of ions into PEG simultaneously enhances the strength and toughness of the elastomer. The strengthening and toughening mechanisms were further revealed by molecular simulation. We demonstrate an application of the IHPs as (a) flexible sensors for strain or temperature sensing, (b) skin electrodes for recording electrocardiograms, and (c) a tough and sensing material for pneumatic artificial muscles. The proposed strategy is simple and easily scalable and can further inspire the design of novel ionic elastomers for ionotronics applications.
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Affiliation(s)
- Zhenwu Wang
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology(KIT), Hermann-von-Helmholtz-Platz 1, Karlsruhe 76344, Eggenstein-Leopoldshafen, Germany
| | - Yu-Cheng Lai
- Institute of Applied Mechanics, College of Engineering, National Taiwan University, Roosevelt Road No. 1, Sec. 4, Taipei 10617, Taiwan, Republic of China
| | - Ya-Tang Chiang
- Institute of Polymer Science and Engineering, National Taiwan University, Roosevelt Road No. 1, Sec. 4, Taipei 10617, Taiwan, Republic of China
| | - Johannes Martin Scheiger
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology(KIT), Hermann-von-Helmholtz-Platz 1, Karlsruhe 76344, Eggenstein-Leopoldshafen, Germany
| | - Shuai Li
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology(KIT), Hermann-von-Helmholtz-Platz 1, Karlsruhe 76344, Eggenstein-Leopoldshafen, Germany
| | - Zheqin Dong
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology(KIT), Hermann-von-Helmholtz-Platz 1, Karlsruhe 76344, Eggenstein-Leopoldshafen, Germany
| | - Qianyu Cai
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology(KIT), Hermann-von-Helmholtz-Platz 1, Karlsruhe 76344, Eggenstein-Leopoldshafen, Germany
| | - Sida Liu
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology(KIT), Hermann-von-Helmholtz-Platz 1, Karlsruhe 76344, Eggenstein-Leopoldshafen, Germany
| | - Shan-Hui Hsu
- Institute of Polymer Science and Engineering, National Taiwan University, Roosevelt Road No. 1, Sec. 4, Taipei 10617, Taiwan, Republic of China
| | - Chia-Ching Chou
- Institute of Applied Mechanics, College of Engineering, National Taiwan University, Roosevelt Road No. 1, Sec. 4, Taipei 10617, Taiwan, Republic of China
| | - Pavel A Levkin
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology(KIT), Hermann-von-Helmholtz-Platz 1, Karlsruhe 76344, Eggenstein-Leopoldshafen, Germany
- Institute of Organic Chemistry (IOC), Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, Karlsruhe 76131, Germany
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Abstract
Strain engineering is an important method for tuning the properties of semiconductors and has been used to improve the mobility of silicon transistors for several decades. Recently, theoretical studies have predicted that strain can also improve the mobility of two-dimensional (2D) semiconductors, e.g., by reducing intervalley scattering or lowering effective masses. Here, we experimentally show strain-enhanced electron mobility in monolayer MoS2 transistors with uniaxial tensile strain, on flexible substrates. The on-state current and mobility are nearly doubled with tensile strain up to 0.7%, and devices return to their initial state after release of the strain. We also show a gate-voltage-dependent gauge factor up to 200 for monolayer MoS2, which is higher than previous values reported for sub-1 nm thin piezoresistive films. These results demonstrate the importance of strain engineering 2D semiconductors for performance enhancements in integrated circuits, or for applications such as flexible strain sensors.
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Affiliation(s)
- Isha M Datye
- Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
| | - Alwin Daus
- Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
| | - Ryan W Grady
- Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
| | - Kevin Brenner
- Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
| | - Sam Vaziri
- Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
| | - Eric Pop
- Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
- Department of Materials Science & Engineering, Stanford University, Stanford, California 94305, United States
- Precourt Institute for Energy, Stanford University, Stanford, California 94305, United States
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Uzabakiriho PC, Wang M, Wang K, Ma C, Zhao G. High-Strength and Extensible Electrospun Yarn for Wearable Electronics. ACS Appl Mater Interfaces 2022; 14:46068-46076. [PMID: 36169212 DOI: 10.1021/acsami.2c13182] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Stretchable conductive yarns have received significant consideration in the direction of wearable and flexible electronics. Wearable electronic structures need strong materials to assure stability, durability, and an extensive range of strain to develop their applications. Therefore, manufacturing high-performance yarn-based devices with ultrarobustness and great stretchability with a simple, cost-effective, and scalable method remains a great challenge for wearable electronics. Here, a highly stretchable yarn with high performance is fabricated, which comprises a core TPU nanoyarn, successively decorated with a liquid metal (LM) layer, and a protective outer nanofiber layer. The ultrarobust (40 MPa) and high-strain (548%) conducting yarn presents potential applications in assembling strain sensors. Moreover, such a unique conductive yarn can be used as a highly deformable, stretchable conductor to charge a mobile phone or for data transfer, a sensor to monitor human activities, and as an effective control for a hand robot as well as for smart thermal management textile application. This research gives promising applications in the field of flexible and wearable electronics.
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Affiliation(s)
- Pierre Claver Uzabakiriho
- Department of Electronic Science and Technology, University of Science and Technology of China, Road JinZhai 96, Hefei 230027, P. R. China
| | - Meng Wang
- Department of Electronic Science and Technology, University of Science and Technology of China, Road JinZhai 96, Hefei 230027, P. R. China
| | - Kai Wang
- Department of Electronic Science and Technology, University of Science and Technology of China, Road JinZhai 96, Hefei 230027, P. R. China
| | - Chao Ma
- Department of Electronic Science and Technology, University of Science and Technology of China, Road JinZhai 96, Hefei 230027, P. R. China
| | - Gang Zhao
- Department of Electronic Science and Technology, University of Science and Technology of China, Road JinZhai 96, Hefei 230027, P. R. China
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45
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Zhang H, Xiong T, Zhou T, Zhang X, Wang Y, Zhou X, Wei L. Advanced Fiber-Shaped Aqueous Zn Ion Battery Integrated with Strain Sensor. ACS Appl Mater Interfaces 2022; 14:41045-41052. [PMID: 36047718 DOI: 10.1021/acsami.2c11638] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Multifunctional batteries have attracted increasing attention, offering additional functionalities beyond the conventional batteries. Herein, we report a fiber-shaped Zn ion battery that not only acts as a high-performance power supply but also provides a sensing function to monitor human motions. Titanium fiber coated with α-MnO2 nanoflowers is exploited as the cathode for the fiber-shaped Zn ion battery, taking full advantage of such unique three-dimensional nanoflower structures of α-MnO2 with a large electrochemically active surface area and fast electrochemical reaction kinetics. Thus, the obtained fiber-shaped Zn ion battery shows a high capacity of 280 mAh g-1 at 0.1 A g-1, resulting in a notable energy density of 396 Wh kg-1, good stability (capacity retention of 80.6% after 300 cycles), and high flexibility. As a demonstration, an electronic watch and five LEDs are successfully driven by two fiber-shaped Zn ion batteries. Furthermore, the fiber-shaped Zn ion battery is integrated with a strain sensor based on a carbon nanotube/polydimethylsiloxane film, offering good sensitivity to monitor motions of different body parts, such as the wrist, finger, elbow, and knee. This work provides insights into multifunctional battery applications for next-generation wearable electronics.
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Affiliation(s)
- Haozhe Zhang
- School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore
| | - Ting Xiong
- School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore
| | - Tianzhu Zhou
- School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore
| | - Xiao Zhang
- School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore
| | - Yuntian Wang
- School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore
| | - Xuhui Zhou
- School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore
| | - Lei Wei
- School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore
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46
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Jamil B, Rodrigue H. Low-Powered and Resilient IR-Based Pigmented Soft Optoelectronic Sensors. ACS Appl Mater Interfaces 2022; 14:38144-38152. [PMID: 35943270 DOI: 10.1021/acsami.2c07318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Soft optoelectronic sensors capable of multimodal sensing have high repeatability, which makes them an attractive choice for applications requiring deformable sensors. A weakness of these sensors is the constant supply of electrical power input required to pass the light signal through their core, which can lead to excessive power requirements for portable devices. Using an infrared (IR) spectrum signal that requires very low power for signal propagation should help alleviate this issue. However, soft optoelectronic sensors can be easily disturbed by external light sources or even suffer from cross-interference, and IR-based sensors are more susceptible to such interferences since IR wavelengths can penetrate the cladding material generally used in soft optical waveguides. This paper presents a highly stretchable low-powered IR-based soft optoelectronic stretchable sensor with pigmented cladding capable of multimodal sensing. The use of an IR-spectrum signal makes it consume a fraction of the power of what a visible spectrum-based optoelectronic sensor would consume. Pigmented elastomers are used as the cladding of the waveguides of these sensors, which makes them highly resilient. These sensors are embedded in a resilient soft robotic gripper capable of controlling its contact force even with significant external disturbances.
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Affiliation(s)
- Babar Jamil
- School of Mechanical Engineering, Sungkyungwan University, Suwon 16419, South Korea
| | - Hugo Rodrigue
- School of Mechanical Engineering, Sungkyungwan University, Suwon 16419, South Korea
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Shen Z, Zhang Z, Zhang N, Li J, Zhou P, Hu F, Rong Y, Lu B, Gu G. High-Stretchability, Ultralow-Hysteresis ConductingPolymer Hydrogel Strain Sensors for Soft Machines. Adv Mater 2022; 34:e2203650. [PMID: 35726439 DOI: 10.1002/adma.202203650] [Citation(s) in RCA: 78] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 06/05/2022] [Indexed: 05/27/2023]
Abstract
Highly stretchable strain sensors based on conducting polymer hydrogel are rapidly emerging as a promising candidate toward diverse wearable skins and sensing devices for soft machines. However, due to the intrinsic limitations of low stretchability and large hysteresis, existing strain sensors cannot fully exploit their potential when used in wearable or robotic systems. Here, a conducting polymer hydrogel strain sensor exhibiting both ultimate strain (300%) and negligible hysteresis (<1.5%) is presented. This is achieved through a unique microphase semiseparated network design by compositing poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) nanofibers with poly(vinyl alcohol) (PVA) and facile fabrication by combining 3D printing and successive freeze-thawing. The overall superior performances of the strain sensor including stretchability, linearity, cyclic stability, and robustness against mechanical twisting and pressing are systematically characterized. The integration and application of such strain sensor with electronic skins are further demonstrated to measure various physiological signals, identify hand gestures, enable a soft gripper for objection recognition, and remote control of an industrial robot. This work may offer both promising conducting polymer hydrogels with enhanced sensing functionalities and technical platforms toward stretchable electronic skins and intelligent robotic systems.
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Affiliation(s)
- Zequn Shen
- Robotics Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Zhilin Zhang
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang, 330013, China
| | - Ningbin Zhang
- Robotics Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jinhao Li
- Robotics Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Peiwei Zhou
- Robotics Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Faqi Hu
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang, 330013, China
| | - Yu Rong
- Robotics Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Baoyang Lu
- Jiangxi Key Laboratory of Flexible Electronics, Flexible Electronics Innovation Institute, Jiangxi Science and Technology Normal University, Nanchang, 330013, China
| | - Guoying Gu
- Robotics Institute, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
- State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China
- Meta Robotics Institute, Shanghai Jiao Tong University, Shanghai, 200240, China
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48
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Ko S, Chhetry A, Kim D, Yoon H, Park JY. Hysteresis-Free Double-Network Hydrogel-Based Strain Sensor for Wearable Smart Bioelectronics. ACS Appl Mater Interfaces 2022; 14:31363-31372. [PMID: 35764418 DOI: 10.1021/acsami.2c09895] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Hydrogel-based electronics have attracted substantial attention in the field of biological engineering, energy storage devices, and soft actuators due to their resemblance to living tissues, biocompatibility, tunable softness, and consolidated structures. However, combining the properties of quick resilience, hysteresis-free, and robust mechanical properties in physically cross-linked hydrogels is still a great challenge. Herein, we present a vinyl hybrid silica nanoparticle (VSNPs)/polyacrylamide (PAAm)/alginate double-network hydrogel-based strain sensor with the characteristics of quick resilience, hysteresis-free, and a low limit of detection (LOD). The physical cross-linking among PAAm chains and covalent cross-linking between PAAm, alginate, and N,N-methylenebisacrylamide chains promotes excellent mechanical properties. Moreover, the incorporation of VSNPs reinforces the mechanical strength by the dynamic cross-linking of the PAAm network to maintain the integrity of the hydrogel and works as a stress buffer to dissipate energy. The as-prepared hydrogel-based sensor exhibits a strain sensitivity (i.e., gauge factor) of 1.73 (up to 100% strain), a response time of 0.16 s, an ultra-low electrical hysteresis of 2.43%, and a low LOD of 0.4%. The outstanding properties of the hydrogel are further used to illustrate the utility of the sensor in e-skin, ranging from low-strain applications, such as carotid pulse and artificial sound detection, to large bending applications, such as sign language translations. In addition, an efficient and cost-effective synthesis of double-network hydrogel that can overcome the bottleneck of the electromechanical properties of single network hydrogel has potential prospects in soft actuators, tissue engineering, and various biomedical applications.
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Affiliation(s)
- Seokgyu Ko
- Advanced Sensor and Energy Research (ASER) Laboratory, Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
| | - Ashok Chhetry
- Advanced Sensor and Energy Research (ASER) Laboratory, Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
| | - Dongkyun Kim
- Advanced Sensor and Energy Research (ASER) Laboratory, Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
| | - Hyosang Yoon
- Advanced Sensor and Energy Research (ASER) Laboratory, Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
| | - Jae Yeong Park
- Advanced Sensor and Energy Research (ASER) Laboratory, Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
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49
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Ghahremani B, Enshaeian A, Rizzo P. Bridge Health Monitoring Using Strain Data and High-Fidelity Finite Element Analysis. Sensors (Basel) 2022; 22:5172. [PMID: 35890852 PMCID: PMC9322960 DOI: 10.3390/s22145172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/05/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
This article presented a physics-based structural health monitoring (SHM) approach applied to a pretensioned adjacent concrete box beams bridge in order to predict the deformations associated with the presence of transient loads. A detailed finite element model was generated using ANSYS software to create an accurate model of the bridge. The presence of concentrated loads on the deck at different locations was simulated, and a static analysis was performed to quantify the deformations induced by the loads. Such deformations were then compared to the strains recorded by an array of wireless strain gauges during a controlled truckload test performed by an independent third party. The test consisted of twenty low-speed crossings at controlled distances from the bridge parapets using a truck with a certified load. The array was part of a SHM system that consisted of 30 wireless strain gauges. The results of the comparative analysis showed that the proposed physics-based monitoring is capable of identifying sensor-related faults and of determining the load distributions across the box beams. In addition, the data relative to near two-years monitoring were presented and showed the reliability of the SHM system as well as the challenges associated with environmental effects on the strain reading. An ongoing study is determining the ability of the proposed physics-based monitoring at estimating the variation of strain under simulated damage scenarios.
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Chu Z, Li G, Gong X, Zhao Z, Tan Y, Jiang Z. Hierarchical Wrinkles for Tunable Strain Sensing Based on Programmable, Anisotropic, and Patterned Graphene Hybrids. Polymers (Basel) 2022; 14:polym14142800. [PMID: 35890576 PMCID: PMC9322441 DOI: 10.3390/polym14142800] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 07/05/2022] [Accepted: 07/07/2022] [Indexed: 12/18/2022] Open
Abstract
Flexible, stretchable, wearable, and stable electronic materials are widely studied, owing to their applications in wearable devices and the Internet of Things. Because of the demands for both strain-insensitive resistors and high gauge factor (GF) strain-sensitive materials, anisotropic strain sensitivity has been an important aspect of electronic materials. In addition, the materials should have adjustable strain sensitivities. In this work, such properties are demonstrated in reduced graphene oxide (RGO) with hierarchical oriented wrinkle microstructures, generated using the two-step shrinkage of a rubber substrate. The GF values range from 0.15 to 28.32 at 100% strain. For device demonstrations, macrostructure patterns are designed to prepare patterned wrinkling graphene at rubber substrate (PWG@R). Serpentiform curves can be used for the constant-value resistor, combined with the first-grade wrinkles. Strip lines can increase the strain-sensing property, along with the second-grade wrinkles. The patterned sensor exhibits improved GF values range from 0.05 to 49.5. The assembled sensor shows an excellent stability (>99% retention after 600 cycles) with a high GF (49.5). It can monitor the vital signs of the throat and wrist and sense large motions of fingers. Thus, PWG@R-based strain sensors have great potential in various health or motion monitoring fields.
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