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Zhu J, Zhu P, Zhu Y, Ye Y, Sun X, Zhang Y, Rojas OJ, Servati P, Jiang F. Surface charge manipulation for improved humidity sensing of TEMPO-oxidized cellulose nanofibrils. Carbohydr Polym 2024; 335:122059. [PMID: 38616073 DOI: 10.1016/j.carbpol.2024.122059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 03/03/2024] [Accepted: 03/12/2024] [Indexed: 04/16/2024]
Abstract
Cellulose-based humidity sensors have attracted great research interest due to their hydrophilicity, biodegradability, and low cost. However, they still suffer from relatively low humidity sensitivity. Due to the presence of negatively charged carboxylate groups, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibril (CNF) exhibits enhanced hydrophilicity and ion conductivity, which is considered a promising candidate for humidity sensing. In this work, we developed a facile strategy to improve the humidity sensitivity of CNF films by regulating their surface charge density. With the increase in surface charge density, both water uptake and charge carrier densities of the CNF films can be improved, enabling a humidity sensitivity of up to 44.5 % (%RH)-1, higher than that of most polymer-based humidity sensors reported in the literature. Meanwhile, the sensor also showed good linearity (R2 = 0.998) over the 15-75 % RH at 1 kHz. With these features, the CNF film was further demonstrated for applications in noncontact sensing, such as human respiration, moisture on fingertips, and water leakage, indicating the great potential of CNF film in humidity monitoring.
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Affiliation(s)
- Jiaying Zhu
- Sustainable Functional Biomaterials Laboratory, Bioproducts Institute, Department of Wood Science, The University of British Columbia, Vancouver V6T 1Z4, Canada; Flexible Electronics and Energy Lab, Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Penghui Zhu
- Sustainable Functional Biomaterials Laboratory, Bioproducts Institute, Department of Wood Science, The University of British Columbia, Vancouver V6T 1Z4, Canada.
| | - Yeling Zhu
- Sustainable Functional Biomaterials Laboratory, Bioproducts Institute, Department of Wood Science, The University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Yuhang Ye
- Sustainable Functional Biomaterials Laboratory, Bioproducts Institute, Department of Wood Science, The University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Xia Sun
- Sustainable Functional Biomaterials Laboratory, Bioproducts Institute, Department of Wood Science, The University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Yifan Zhang
- Sustainable Functional Biomaterials Laboratory, Bioproducts Institute, Department of Wood Science, The University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Orlando J Rojas
- Bioproducts Institute, Department of Chemical & Biological Engineering, Department of Chemistry and Departments of Wood Science, The University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Peyman Servati
- Flexible Electronics and Energy Lab, Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver V6T 1Z4, Canada.
| | - Feng Jiang
- Sustainable Functional Biomaterials Laboratory, Bioproducts Institute, Department of Wood Science, The University of British Columbia, Vancouver V6T 1Z4, Canada.
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Xue Y, Wang Z, Dutta A, Chen X, Gao P, Li R, Yan J, Niu G, Wang Y, Du S, Cheng H, Yang L. Superhydrophobic, stretchable kirigami pencil-on-paper multifunctional device platform. CHEMICAL ENGINEERING JOURNAL (LAUSANNE, SWITZERLAND : 1996) 2023; 465:142774. [PMID: 37484163 PMCID: PMC10361402 DOI: 10.1016/j.cej.2023.142774] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
Wearable electronics with applications in healthcare, human-machine interfaces, and robotics often explore complex manufacturing procedures and are not disposable. Although the use of conductive pencil patterns on cellulose paper provides inexpensive, disposable sensors, they have limited stretchability and are easily affected by variations in the ambient environment. This work presents the combination of pencil-on-paper with the hydrophobic fumed SiO2 (Hf-SiO2) coating and stretchable kirigami structures from laser cutting to prepare a superhydrophobic, stretchable pencil-on-paper multifunctional sensing platform. The resulting sensor exhibits a large response to NO2 gas at elevated temperature from self-heating, which is minimally affected by the variations in the ambient temperature and relative humidity, as well as mechanical deformations such as bending and stretching states. The integrated temperature sensor and electrodes with the sensing platform can accurately detect temperature and electrophysiological signals to alert for adverse thermal effects and cardiopulmonary diseases. The thermal therapy and electrical stimulation provided by the platform can also deliver effective means to battle against inflammation/infection and treat chronic wounds. The superhydrophobic pencil-onpaper multifunctional device platform provides a low-cost, disposable solution to disease diagnostic confirmation and early treatment for personal and population health.
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Affiliation(s)
- Ye Xue
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Health Sciences and Biomedical Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Zihan Wang
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Ankan Dutta
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, 16802, USA
| | - Xue Chen
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Key Laboratory of Bioelectromagnetics and Neuroengineering of Hebei Province, School of Electrical Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Peng Gao
- Department of Electronic Information, Hebei University of Technology, Tianjin, 300130, China
| | - Runze Li
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Key Laboratory of Bioelectromagnetics and Neuroengineering of Hebei Province, School of Electrical Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Jiayi Yan
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Guangyu Niu
- Department of Architecture and Art, Hebei University of Technology, Tianjin, 300130, China
| | - Ya Wang
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Shuaijie Du
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Key Laboratory of Bioelectromagnetics and Neuroengineering of Hebei Province, School of Electrical Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Huanyu Cheng
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, 16802, USA
| | - Li Yang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Health Sciences and Biomedical Engineering, Hebei University of Technology, Tianjin 300130, China
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Sun Y, Ding Z, Zhang Y, Dong Z, Sun L, Wang N, Yin M, Zhang J, Wang GP. Carbon nanocoils decorated with scale-like mesoporous NiO nanosheets for ultrasensitive room temperature ppb-level NO 2 sensing. Phys Chem Chem Phys 2023; 25:3485-3493. [PMID: 36637146 DOI: 10.1039/d2cp04860d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Although NO2 detection based on metal oxide semiconductors (MOSs) has received continuous attention, the sensing properties of MOSs still need to be further improved for practical application. Carbon nanocoils (CNCs) exhibit excellent physicochemical properties due to their unique polycrystalline amorphous structure and helical morphology. Herein, CNCs composited with NiO nanosheets were developed for room temperature NO2 sensing, in which highly dispersed mesoporous NiO nanosheets on CNCs was achieved with extremely higher sensitivity. Due to a large number of exposed active sites and the efficient conductive network of CNCs, this particular scale-like nanocomposite exhibits a nearly 8 times higher response to 60 ppm NO2 than bare NiO nanosheets at room temperature, outperforming the majority of previously reported NO2 sensors at room temperature. Moreover, the nanocomposite-based gas sensor has a detection concentration limit of 60.3 ppb, which is advantageous for the sensing of NO2 at low concentrations. We believe that this work will provide the direction for the research and development of highly sensitive smart sensors, as well as encourage further investigation of multifunctional sensing applications utilizing CNCs as the primary frame support material.
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Affiliation(s)
- Yanming Sun
- College of Electronics and Information Engineering, Shenzhen University, 3688 Nanhai Boulevard, Shenzhen, 518060, China.
| | - Zhezhe Ding
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China
| | - Yupeng Zhang
- College of Electronics and Information Engineering, Shenzhen University, 3688 Nanhai Boulevard, Shenzhen, 518060, China.
| | - Zhe Dong
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China
| | - Lei Sun
- College of Electronics and Information Engineering, Shenzhen University, 3688 Nanhai Boulevard, Shenzhen, 518060, China.
| | - Neng Wang
- College of Electronics and Information Engineering, Shenzhen University, 3688 Nanhai Boulevard, Shenzhen, 518060, China.
| | - Meijie Yin
- Electron Microscope Center, Shenzhen University, 3688 Nanhai Boulevard, Shenzhen, 518060, China
| | - Jian Zhang
- College of Electronics and Information Engineering, Shenzhen University, 3688 Nanhai Boulevard, Shenzhen, 518060, China. .,Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China
| | - Guo Ping Wang
- College of Electronics and Information Engineering, Shenzhen University, 3688 Nanhai Boulevard, Shenzhen, 518060, China.
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A Self-Powered PVA-Based Flexible Humidity Sensor with Humidity-Related Voltage Output for Multifunctional Applications. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Chen X, Li Y, Wang X, Yu H. Origami Paper-Based Stretchable Humidity Sensor for Textile-Attachable Wearable Electronics. ACS APPLIED MATERIALS & INTERFACES 2022; 14:36227-36237. [PMID: 35912486 DOI: 10.1021/acsami.2c08245] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Flexible and stretchable humidity sensors for wearable purposes have become increasingly important in health care and physiological signal monitoring. However, to the authors' knowledge, there is no report on flexible and stretchable paper-based humidity sensors that are low-cost, easily fabricated, and environmentally friendly. In this work, for the first time, we propose a stretchable, textile-compatible paper-based origami humidity sensor (POHS). The POHS can achieve good stretchability by integrating origami folding structures with a paper substrate, in which an airlaid paper acts as both a sensing material and a sensor substrate. This sensor has high sensitivity, good response, and recovery properties with excellent stability during deformation. This sensor has proved to be capable of dynamically monitoring the breathing rate after 300 folding and unfolding cycles. The flexible and stretchable nature of our POHS ensures that it is compatible for textile attachment and its utility for wearable applications, including respiration rate monitoring and diaper wetting detection. The facile fabrication process and convenient disposal method of the POHS proposed in this study provide feasible solutions for the development of low-cost wearable humidity sensors.
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Affiliation(s)
- Xingru Chen
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR
| | - Yongkai Li
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR
| | - Xiaoyi Wang
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR
- The School of Integrated Circuits and Electronics, Beijing Institute of Technology, Beijing 100081, China
| | - Hongyu Yu
- Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR
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Fabrication and Conductive Mechanism Analysis of Stretchable Electrodes Based on PDMS-Ag Nanosheet Composite with Low Resistance, Stability, and Durability. NANOMATERIALS 2022; 12:nano12152628. [PMID: 35957060 PMCID: PMC9370586 DOI: 10.3390/nano12152628] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 07/25/2022] [Accepted: 07/28/2022] [Indexed: 02/04/2023]
Abstract
A flexible and stretchable electrode based on polydimethylsiloxane (PDMS)-Ag nanosheet composite with low resistance and stable properties has been investigated. Under the synergistic effect of the excellent flexibility and stretchability of PDMS and the excellent electrical conductivity of Ag nanosheets, the electrode possesses a resistivity as low as 4.28 Ωm, a low resistance variation in the 0–50% strain range, a stable electrical conductivity over 1000 cycles, and a rapid recovery ability after failure caused by destructive large stretching. Moreover, the conductive mechanism of the flexible electrode during stretching is explained by combining experimental tests, theoretical models of contact point-tunneling effect, and finite element simulation. This research provides a simple and effective solution for the structure design and material selection of flexible electrodes, and an analytical method for the conductive mechanism of stretchable electrodes, which has potential for applications in flexible electronic devices, smart sensing, wearable devices, and other fields.
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Developing Wound Moisture Sensors: Opportunities and Challenges for Laser-Induced Graphene-Based Materials. JOURNAL OF COMPOSITES SCIENCE 2022. [DOI: 10.3390/jcs6060176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Recent advances in polymer composites have led to new, multifunctional wound dressings that can greatly improve healing processes, but assessing the moisture status of the underlying wound site still requires frequent visual inspection. Moisture is a key mediator in tissue regeneration and it has long been recognised that there is an opportunity for smart systems to provide quantitative information such that dressing selection can be optimised and nursing time prioritised. Composite technologies have a rich history in the development of moisture/humidity sensors but the challenges presented within the clinical context have been considerable. This review aims to train a spotlight on existing barriers and highlight how laser-induced graphene could lead to emerging material design strategies that could allow clinically acceptable systems to emerge.
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