1
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Pan M, Zhou J, Weng S, Wu X. Flexible Chitosan-Based Capacitive Humidity Sensors for Respiratory Monitoring. SENSORS (BASEL, SWITZERLAND) 2024; 24:1352. [PMID: 38474888 DOI: 10.3390/s24051352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 02/06/2024] [Accepted: 02/06/2024] [Indexed: 03/14/2024]
Abstract
As one of the most important human health indicators, respiratory status is an important basis for the diagnosis of many diseases. However, the high cost of respiratory monitoring makes its use uncommon. This study introduces a low-cost, wearable, flexible humidity sensor for respiratory monitoring. Solution-processed chitosan (CS) placed on a polyethylene terephthalate substrate was used as the sensing layer. An Arduino circuit board was used to read humidity-sensitive voltage changes. The CS-based sensor demonstrated capacitive humidity sensitivity, whereby the capacitance instantly increased from 10-2 to 30 nF when the environmental humidity changed from 43% to 97%. The capacitance logarithm sensitivity and response voltage change was 35.9 pF/%RH and 0.8 V in the RH range from 56% to 97%. And the voltage variation between inhalation and exhalation was ~0.5 V during normal breathing. A rapid response time of ~0.7 s and a recovery time of ~2 s were achieved during respiration testing. Breathing modes (i.e., normal breathing, rest breathing, deep breathing, and fast breathing) and tonal changes during speech could be clearly distinguished. Therefore, such sensors provide a means for economical and convenient wearable respiratory monitoring, and they have the potential to be used for daily health examinations and professional medical diagnoses.
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Affiliation(s)
- Miaoxin Pan
- School of Maritime and Transportation, Ningbo University, Ningbo 315800, China
| | - Jumei Zhou
- School of Maritime and Transportation, Ningbo University, Ningbo 315800, China
| | - Shichen Weng
- School of Maritime and Transportation, Ningbo University, Ningbo 315800, China
| | - Xingjian Wu
- School of Maritime and Transportation, Ningbo University, Ningbo 315800, China
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2
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Jose M, Bezerra Alexandre E, Neumaier L, Rauter L, Vijjapu MT, Muehleisen W, Malik MH, Zikulnig J, Kosel J. Future Thread: Printing Electronics on Fibers. ACS APPLIED MATERIALS & INTERFACES 2024; 16:7996-8005. [PMID: 38310570 DOI: 10.1021/acsami.3c15422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2024]
Abstract
This article introduces a methodology to increase the integration density of functional electronic features on fibers/threads/wires through additive deposition of functional materials via printed electronics. It opens the possibility to create a multifunctional intelligent system on a single fiber/thread/wire while combining the advantages of existing approaches, i.e., the scalability of coating techniques and the microfeatures of semiconductor-based fabrication. By directly printing on threads (of diameters ranging from 90 to 1000 μm), micropatterned electronic devices and multifunctional electronic systems could be formed. Contact and noncontact printing methods were utilized to create various shapes from serpentines and meanders to planar coils and interdigitated electrodes, as well as complex multilayer structures for thermal and light actuators, humidity, and temperature sensors. We demonstrate the practicality of the method by integrating a multifunctional thread into a FFP mask for breath monitoring. Printing technologies provide virtually unrestricted choices for the types of threads, materials, and devices used. They are scalable via roll-to-roll processes and offer a resource-efficient way to democratize electronics across textile products.
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Affiliation(s)
- Manoj Jose
- Silicon Austria Labs GmbH, Europastraße 12, Villach 9524, Austria
| | - Emily Bezerra Alexandre
- Silicon Austria Labs GmbH, Europastraße 12, Villach 9524, Austria
- Bio/CMOS Interfaces Lab, École Polytechnique Fédérale de Lausanne, EPFL, Neuchâtel CH-2000, Switzerland
| | - Lukas Neumaier
- Silicon Austria Labs GmbH, Europastraße 12, Villach 9524, Austria
| | - Lukas Rauter
- Silicon Austria Labs GmbH, Europastraße 12, Villach 9524, Austria
| | | | | | | | - Johanna Zikulnig
- Silicon Austria Labs GmbH, Europastraße 12, Villach 9524, Austria
- Bio/CMOS Interfaces Lab, École Polytechnique Fédérale de Lausanne, EPFL, Neuchâtel CH-2000, Switzerland
| | - Jürgen Kosel
- Silicon Austria Labs GmbH, Europastraße 12, Villach 9524, Austria
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3
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Yan M, Hao Q, Diao S, Zhou F, Yichen C, Jiang N, Zhao C, Ren XR, Yu F, Tong J, Wang D, Liu H. Smart Home Sleep Respiratory Monitoring System Based on a Breath-Responsive Covalent Organic Framework. ACS NANO 2024; 18:728-737. [PMID: 38118144 DOI: 10.1021/acsnano.3c09018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
A smart home sleep respiratory monitoring system based on a breath-responsive covalent organic framework (COF) was developed and utilized to monitor the sleep respiratory behavior of real sleep apnea patients in this work. The capacitance of the interdigital electrode chip coated with COFTPDA-TFPy exhibits thousands-level reversible responses to breath humidity gases, with subsecond response time and robustness against environmental humidity. A miniaturized printed circuit board, an open-face-mask-based respiratory sensor, and a smartphone app were constructed for the wearable wireless smart home sleep respiratory monitoring system. Leveraging the sensitive and rapid reversible response of COFs, the COF-based respiratory monitoring system can effectively record normal breath, rapid breath, and breath apnea, enabling over a thousand cycles of hour-level continuous monitoring during daily wear. Next, we took the groundbreaking step of advancing the humidity sensor to the clinical trial stage. In clinical experiments on real sleep apnea patients, the COF-based respiratory monitoring system successfully recorded hour-level sleep respiratory data and differentiated the breathing behavior characteristics and severity of sleep apnea patients and subjects with normal sleep function and primary snoring patients. This work successfully advanced humidity sensors into clinical research for real patients and demonstrated the enormous application potential of COF materials in clinical diagnosis.
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Affiliation(s)
- Mengwen Yan
- State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, 2# Sipailou, Nanjing, Jiangsu 210096, People's Republic of China
| | - Qing Hao
- State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, 2# Sipailou, Nanjing, Jiangsu 210096, People's Republic of China
| | - Shanyan Diao
- State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, 2# Sipailou, Nanjing, Jiangsu 210096, People's Republic of China
| | - Fan Zhou
- State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, 2# Sipailou, Nanjing, Jiangsu 210096, People's Republic of China
| | - Chen Yichen
- State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, 2# Sipailou, Nanjing, Jiangsu 210096, People's Republic of China
| | - Nan Jiang
- State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, 2# Sipailou, Nanjing, Jiangsu 210096, People's Republic of China
| | - Chao Zhao
- State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, 2# Sipailou, Nanjing, Jiangsu 210096, People's Republic of China
| | - Xiao-Rui Ren
- Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Fuchao Yu
- Department of Cardiology, Zhongda Hospital, Nanjing, China Southeast University, Nanjing, Jiangsu 210096, People's Republic of China
| | - Jiayi Tong
- Department of Cardiology, Zhongda Hospital, Nanjing, China Southeast University, Nanjing, Jiangsu 210096, People's Republic of China
| | - Dong Wang
- Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Hong Liu
- State Key Laboratory of Digital Medical Engineering, School of Biological Science and Medical Engineering, Southeast University, 2# Sipailou, Nanjing, Jiangsu 210096, People's Republic of China
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4
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Liu S, Chen R, Chen R, Jiang C, Zhang C, Chen D, Zhou W, Chen S, Luo T. Facile and Cost-Effective Fabrication of Highly Sensitive, Fast-Response Flexible Humidity Sensors Enabled by Laser-Induced Graphene. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 38049206 DOI: 10.1021/acsami.3c12392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
The need to simplify fabrication processes and reduce costs for high-performance humidity sensors is increasingly vital, especially in fields such as healthcare and agriculture. This study introduces a simple and cost-effective approach using laser-induced graphene (LIG) on a polyimide film to create highly sensitive and fast-response flexible humidity sensors. The LIG acts as the electrode, while the porous polyimide between the interdigital LIG electrodes serves as the humidity sensing material, showing changes in electrical conductivity based on the humidity levels. The LIG humidity sensor, an ionic-conduction type, exhibits remarkable sensitivity, with a 28,231-fold increase in current as relative humidity changes from 26.1 to 90.2%. It also boasts of ultrashort response/recovery times (less than 0.5/7 s), providing significant advantages in detecting rapid and subtle humidity variations compared to a commercially available MEMS humidity sensor. We successfully demonstrated the LIG humidity sensor's capabilities in ultrafast breathing monitoring (≈174 times per minute), moisture detection of grains, and detection of sudden water pipe leakage. Due to its straightforward and cost-effective fabrication process, the LIG humidity sensor holds immense practical value for affordable, widespread use across various applications.
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Affiliation(s)
- Sirui Liu
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China
| | - Rui Chen
- School of Aerospace Engineering, Xiamen University, Xiamen 361102, China
| | - Rui Chen
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China
| | - Chongjie Jiang
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China
| | - Chen Zhang
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China
| | - Dongyang Chen
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China
| | - Wei Zhou
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China
| | - Songyue Chen
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China
| | - Tao Luo
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China
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5
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Kim BJ, Bonacchini GE, Ostrovsky-Snider NA, Omenetto FG. Bimodal Gating Mechanism in Hybrid Thin-Film Transistors Based on Dynamically Reconfigurable Nanoscale Biopolymer Interfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2302062. [PMID: 37640508 DOI: 10.1002/adma.202302062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Revised: 07/02/2023] [Indexed: 08/31/2023]
Abstract
In recent years, increased control over naturally derived structural protein formulations and their self-assembly has enabled the application of high-resolution manufacturing techniques to silk-based materials, leading to bioactive interfaces with unprecedented miniaturized formats and functionalities. Here, a hybrid biopolymer-semiconductor device, obtained by integrating nanoscale silk layers in a well-established class of inorganic field-effect transistors (silk-FETs), is presented. The devices offer two distinct modes of operation-either traditional field-effect or electrolyte-gated-enabled by the precisely controlled thickness, morphology, and biochemistry of the integrated silk layers. The different operational modes are selectively accessed by dynamically modulating the free-water content within the nanoscale protein layer from the vapor phase. The utility of these hybrid devices is illustrated in a highly sensitive and ultrafast breath sensor, highlighting the opportunities offered by the integration of nanoscale biomaterial interfaces in conjunction with traditional semiconductor devices, enabling functional outcomes at the intersection between the worlds of microelectronics and biology.
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Affiliation(s)
- Beom Joon Kim
- Silklab, Department of Biomedical Engineering, Tufts University, Medford, MA, 02155, USA
| | | | | | - Fiorenzo G Omenetto
- Silklab, Department of Biomedical Engineering, Tufts University, Medford, MA, 02155, USA
- Department of Electrical and Computer Engineering, Tufts University, Medford, MA, 02155, USA
- Department of Physics, Tufts University, Medford, MA, 02155, USA
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6
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Vaussenat F, Bhattacharya A, Payette J, Benavides-Guerrero JA, Perrotton A, Gerlein LF, Cloutier SG. Continuous Critical Respiratory Parameter Measurements Using a Single Low-Cost Relative Humidity Sensor: Evaluation Study. JMIR BIOMEDICAL ENGINEERING 2023; 8:e47146. [PMID: 38875670 PMCID: PMC11041423 DOI: 10.2196/47146] [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: 03/10/2023] [Revised: 08/22/2023] [Accepted: 09/07/2023] [Indexed: 06/16/2024] Open
Abstract
BACKGROUND Accurate and portable respiratory parameter measurements are critical for properly managing chronic obstructive pulmonary diseases (COPDs) such as asthma or sleep apnea, as well as controlling ventilation for patients in intensive care units, during surgical procedures, or when using a positive airway pressure device for sleep apnea. OBJECTIVE The purpose of this research is to develop a new nonprescription portable measurement device that utilizes relative humidity sensors (RHS) to accurately measure key respiratory parameters at a cost that is approximately 10 times less than the industry standard. METHODS We present the development, implementation, and assessment of a wearable respiratory measurement device using the commercial Bosch BME280 RHS. In the initial stage, the RHS was connected to the pneumotach (PNT) gold standard device via its external connector to gather breathing metrics. Data collection was facilitated using the Arduino platform with a Bluetooth Low Energy connection, and all measurements were taken in real time without any additional data processing. The device's efficacy was tested with 7 participants (5 men and 2 women), all in good health. In the subsequent phase, we specifically focused on comparing breathing cycle and respiratory rate measurements and determining the tidal volume by calculating the region between inhalation and exhalation peaks. Each participant's data were recorded over a span of 15 minutes. After the experiment, detailed statistical analysis was conducted using ANOVA and Bland-Altman to examine the accuracy and efficiency of our wearable device compared with the traditional methods. RESULTS The perfused air measured with the respiratory monitor enables clinicians to evaluate the absolute value of the tidal volume during ventilation of a patient. In contrast, directly connecting our RHS device to the surgical mask facilitates continuous lung volume monitoring. The results of the 1-way ANOVA showed high P values of .68 for respiratory volume and .89 for respiratory rate, which indicate that the group averages with the PNT standard are equivalent to those with our RHS platform, within the error margins of a typical instrument. Furthermore, analysis utilizing the Bland-Altman statistical method revealed a small bias of 0.03 with limits of agreement (LoAs) of -0.25 and 0.33. The RR bias was 0.018, and the LoAs were -1.89 and 1.89. CONCLUSIONS Based on the encouraging results, we conclude that our proposed design can be a viable, low-cost wearable medical device for pulmonary parametric measurement to prevent and predict the progression of pulmonary diseases. We believe that this will encourage the research community to investigate the application of RHS for monitoring the pulmonary health of individuals.
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Affiliation(s)
- Fabrice Vaussenat
- Department of Electrical Engineering, École de Technologie Supérieure, Montreal, QC, Canada
| | - Abhiroop Bhattacharya
- Department of Electrical Engineering, École de Technologie Supérieure, Montreal, QC, Canada
| | - Julie Payette
- Department of Electrical Engineering, École de Technologie Supérieure, Montreal, QC, Canada
| | | | - Alexandre Perrotton
- Department of Electrical Engineering, École de Technologie Supérieure, Montreal, QC, Canada
| | - Luis Felipe Gerlein
- Department of Electrical Engineering, École de Technologie Supérieure, Montreal, QC, Canada
| | - Sylvain G Cloutier
- Department of Electrical Engineering, École de Technologie Supérieure, Montreal, QC, Canada
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7
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Ragazzini I, Gualandi I, D'Altri G, Di Matteo V, Yeasmin L, Cassani MC, Scavetta E, Bernardi E, Ballarin B. Polyaniline/poly (2-acrylamido-2-methyl-1-propanesulfonic acid) modified cellulose as promising material for sensors design. Carbohydr Polym 2023; 316:121079. [PMID: 37321752 DOI: 10.1016/j.carbpol.2023.121079] [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: 02/23/2023] [Revised: 05/26/2023] [Accepted: 05/29/2023] [Indexed: 06/17/2023]
Abstract
A material based on cellulose coated with polyaniline/poly (2-acrylamido-2-methyl-1-propanesulfonic acid) (Cell/PANI-PAMPSA) was synthesized in a simple way starting from cellulose fibres, aniline and using PAMPSA as dopant. The morphology, mechanical properties, thermal stability, and electrical conductivity were investigated by means of several complementary techniques. The obtained results highlight the excellent features of the Cell/PANI-PAMPSA composite with respect to the Cell/PANI one. Based on the promising performance of this material, novel device functions and wearable applications have been tested. We focused on its possible single use as: i) humidity sensors and ii) disposable biomedical sensors to provide immediate diagnostic services as close to the patient as possible for heart rate or respiration activity monitoring. To our knowledge, this is the first time that Cell/PANI-PAMPSA system has been used for such applications.
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Affiliation(s)
- I Ragazzini
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy
| | - I Gualandi
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy; Center for Industrial Research-Fonti Rinnovabili, Ambiente, Mare e Energia CIRI FRAME University of Bologna, Viale del Risorgimento 2, I-40136 Bologna, Italy.
| | - G D'Altri
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy
| | - V Di Matteo
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy
| | - L Yeasmin
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy
| | - M C Cassani
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy; Center for Industrial Research-Advanced Applications in Mechanical Engineering and Materials Technology CIRI MAM University of Bologna, Viale del Risorgimento 2, I-40136 Bologna, Italy
| | - E Scavetta
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy
| | - E Bernardi
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy; Center for Industrial Research-Fonti Rinnovabili, Ambiente, Mare e Energia CIRI FRAME University of Bologna, Viale del Risorgimento 2, I-40136 Bologna, Italy
| | - B Ballarin
- Department of Industrial Chemistry "Toso Montanari", Bologna University, UdR INSTM of Bologna, Via Risorgimento 4, I-40136, Bologna, Italy; Center for Industrial Research-Advanced Applications in Mechanical Engineering and Materials Technology CIRI MAM University of Bologna, Viale del Risorgimento 2, I-40136 Bologna, Italy; Center for Industrial Research-Fonti Rinnovabili, Ambiente, Mare e Energia CIRI FRAME University of Bologna, Viale del Risorgimento 2, I-40136 Bologna, Italy.
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8
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Korotcenkov G, Simonenko NP, Simonenko EP, Sysoev VV, Brinzari V. Paper-Based Humidity Sensors as Promising Flexible Devices, State of the Art, Part 2: Humidity-Sensor Performances. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13081381. [PMID: 37110966 PMCID: PMC10144639 DOI: 10.3390/nano13081381] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/11/2023] [Accepted: 04/14/2023] [Indexed: 05/27/2023]
Abstract
This review article covers all types of paper-based humidity sensor, such as capacitive, resistive, impedance, fiber-optic, mass-sensitive, microwave, and RFID (radio-frequency identification) humidity sensors. The parameters of these sensors and the materials involved in their research and development, such as carbon nanotubes, graphene, semiconductors, and polymers, are comprehensively detailed, with a special focus on the advantages/disadvantages from an application perspective. Numerous technological/design approaches to the optimization of the performances of the sensors are considered, along with some non-conventional approaches. The review ends with a detailed analysis of the current problems encountered in the development of paper-based humidity sensors, supported by some solutions.
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Affiliation(s)
- Ghenadii Korotcenkov
- Department of Physics and Engineering, Moldova State University, MD-2009 Chisinau, Moldova;
| | - Nikolay P. Simonenko
- Kurnakov Institute of General and Inorganic Chemistry, The Russian Academy of Sciences, 31 Leninsky pr., 119991 Moscow, Russia; (N.P.S.); (E.P.S.)
| | - Elizaveta P. Simonenko
- Kurnakov Institute of General and Inorganic Chemistry, The Russian Academy of Sciences, 31 Leninsky pr., 119991 Moscow, Russia; (N.P.S.); (E.P.S.)
| | - Victor V. Sysoev
- Department of Physics, Yuri Gagarin State Technical University of Saratov, 77 Polytechnicheskaya str., 410054 Saratov, Russia;
| | - Vladimir Brinzari
- Department of Physics and Engineering, Moldova State University, MD-2009 Chisinau, Moldova;
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9
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Lim WY, Goh CH, Yap KZ, Ramakrishnan N. One-Step Fabrication of Paper-Based Inkjet-Printed Graphene for Breath Monitor Sensors. BIOSENSORS 2023; 13:bios13020209. [PMID: 36831975 PMCID: PMC9953765 DOI: 10.3390/bios13020209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/21/2022] [Accepted: 01/19/2023] [Indexed: 05/14/2023]
Abstract
Irregularities in breathing patterns can be detected using breath monitor sensors, and this help clinicians to predict health disorders ranging from sleep disorders to heart failures. Variations in humidity during the inhalation and exhalation of breath have been utilized as a marker to detect breath patterns, and graphene-based devices are the favored sensing media for relative humidity (RH). In general, most graphene-based RH sensors have been used to explore resistance change as a measurement parameter to calibrate against the RH value, and they are prone to noise interference. Here, we fabricated RH sensors using graphene ink as a sensing medium and printed them in the shape of interdigital electrodes on glossy paper using an office inkjet printer. Further, we investigated the capacitance change in the sensor for the RH changes in the range of 10-70%. It exhibited excellent sensitivity with 0.03 pF/% RH, good stability, and high intraday and interday repeatability, with relative standard deviations of 1.2% and 2.2%, respectively. Finally, the sensor was embedded into a face mask and interfaced with a microcontroller, and capacitance change was measured under three different breathing situations: normal breathing, deep breathing, and coughing. The result show that the dominant frequency for normal breath is 0.22 Hz, for deep breath, it is 0.11 Hz, and there was no significant dominant cough frequency due to persistent coughing and inconsistent patterns. Moreover, the sensor exhibited a short response and recovery time (<5 s) during inhalation and exhalation. Thus, the proposed paper-based RH sensor is promising wearable and disposable healthcare technology for clinical and home care health applications.
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Affiliation(s)
- Wei Yin Lim
- Nano and Micro Devices Laboratory, Electrical and Computer Systems Engineering, School of Engineering and Advanced Engineering Platform, Monash University Malaysia, Bandar Sunway 47500, Malaysia
| | - Choon-Hian Goh
- Department of Mechatronics and Biomedical Engineering, Lee Kong Chian Faculty of Engineering and Science (LKCFES), Sungai Long Campus, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, Kajang 43200, Malaysia
| | - Keenan Zhihong Yap
- Nano and Micro Devices Laboratory, Electrical and Computer Systems Engineering, School of Engineering and Advanced Engineering Platform, Monash University Malaysia, Bandar Sunway 47500, Malaysia
| | - Narayanan Ramakrishnan
- Nano and Micro Devices Laboratory, Electrical and Computer Systems Engineering, School of Engineering and Advanced Engineering Platform, Monash University Malaysia, Bandar Sunway 47500, Malaysia
- Correspondence:
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10
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Ragazzini I, Castagnoli R, Gualandi I, Cassani MC, Nanni D, Gambassi F, Scavetta E, Bernardi E, Ballarin B. A resistive sensor for humidity detection based on cellulose/polyaniline. RSC Adv 2022; 12:28217-28226. [PMID: 36320282 PMCID: PMC9530799 DOI: 10.1039/d2ra03982f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 09/26/2022] [Indexed: 11/05/2022] Open
Abstract
Ambient humidity is an important parameter that affects the manufacturing and storage of several industrial and agricultural goods. In the view of the Internet of Things (IoT), single sensors could be associated with an object for smart monitoring enabling optimum conditions to be maintained. Nevertheless, the production of cost-effective humidity sensors for indoor and outdoor environmental monitoring currently represents the main bottleneck in the development of this technology. Herein we report the results obtained with sensors exclusively made of cellulose and polyaniline (cell/PANI) under strictly controlled relative humidity (30–50 RH%) and temperature (21 ± 1 °C) achieved with a climatic chamber that simulates the conditions of indoor air humidity, and at different RH% in a lab test chamber set-up. Cell/PANI sensors, prepared with a simple, inexpensive, and easily scalable industrial paper process, show a linear trend with a slope of 1.41 μA RH%−1 and a percentage of sensitivity of 13%. Response time as well as percentage of sensitivity results are similar to those of a commercial digital-output relative humidity and temperature sensor (DHT22) employed in parallel for comparison. The commercial sensor DHT22 has a sensitivity of 14%. This low-cost sensor has potential applications in agriculture, food monitoring, and medical and industrial environments as a disposable sensor for humidity detection. Preparation of highly conductive polyaniline-coated cellulose sheets for the fabrication of humidity sensors via a simple, inexpensive, and robust method. These sensors show a linear, rapid, and reliable response for humidity cycling.![]()
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Affiliation(s)
- Ilaria Ragazzini
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386
| | - Riccardo Castagnoli
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386
| | - Isacco Gualandi
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386,Center for Industrial Research-Advanced Applications in Mechanical Engineering and Materials Technology CIRI MAM University of BolognaViale del Risorgimento 2I-40136 BolognaItaly,Center for Industrial Research-Fonti Rinnovabili, Ambiente, Mare e Energia CIRI FRAME University of BolognaViale del Risorgimento 2I-40136 BolognaItaly
| | - Maria Cristina Cassani
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386,Center for Industrial Research-Advanced Applications in Mechanical Engineering and Materials Technology CIRI MAM University of BolognaViale del Risorgimento 2I-40136 BolognaItaly
| | - Daniele Nanni
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386
| | - Francesca Gambassi
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386
| | - Erika Scavetta
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386,Center for Industrial Research-Advanced Applications in Mechanical Engineering and Materials Technology CIRI MAM University of BolognaViale del Risorgimento 2I-40136 BolognaItaly,Center for Industrial Research-Fonti Rinnovabili, Ambiente, Mare e Energia CIRI FRAME University of BolognaViale del Risorgimento 2I-40136 BolognaItaly
| | - Elena Bernardi
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386,Center for Industrial Research-Fonti Rinnovabili, Ambiente, Mare e Energia CIRI FRAME University of BolognaViale del Risorgimento 2I-40136 BolognaItaly
| | - Barbara Ballarin
- Department of Industrial Chemistry “Toso Montanari”, Bologna University, UdR INSTM BolognaVia Risorgimento 4I-40136BolognaItaly+390512093704+390512093386,Center for Industrial Research-Advanced Applications in Mechanical Engineering and Materials Technology CIRI MAM University of BolognaViale del Risorgimento 2I-40136 BolognaItaly,Center for Industrial Research-Fonti Rinnovabili, Ambiente, Mare e Energia CIRI FRAME University of BolognaViale del Risorgimento 2I-40136 BolognaItaly
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Olsen F, Suyderhoud JP, Khanna AK. Respiratory monitoring of nonintubated patients in nonoperating room settings: old and new technologies. Curr Opin Anaesthesiol 2022; 35:521-527. [PMID: 35788554 DOI: 10.1097/aco.0000000000001129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE OF REVIEW Postoperative mortality in the 30 days after surgery remains disturbingly high. Inadequate, intermittent and incomplete monitoring of vital signs in the nonoperating room environment is common practice. The rise of nonoperating room anaesthesia and sedation outside the operating room has highlighted the need to develop new and robust methods of portable continuous respiratory monitoring. This review provides a summary of old and new technologies in this environment. RECENT FINDINGS Technical advances have made possible the utilization of established monitoring to extrapolate respiratory rate, the increased availability and user friendliness of side stream capnography and the advent of other innovative systems. The use of aggregate signals wherein different modalities compensate for individual shortcomings seem to provide a reliable and artefact-free system. SUMMARY Respiratory monitoring is required in several situations and patient categories outside the operating room. The chosen modality must be able to detect respiratory compromise in a timely and accurate manner. Combing several modalities in a nonobtrusive, nontethered system and having an integrated output seems to give a reliable and responsive signal.
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Affiliation(s)
- Fredrik Olsen
- Department of Anesthesiology, Wake Forest School of Medicine, Atrium Health Wake Forest Baptist Medical Center, Winston-Salem, North Carolina, USA
- Department of Anaesthesiology and Critical Care, Sahlgrenska University Hospital/Mölndal, Sweden
| | - Johan Pieter Suyderhoud
- Department of Anesthesiology, Wake Forest School of Medicine, Atrium Health Wake Forest Baptist Medical Center, Winston-Salem, North Carolina, USA
| | - Ashish K Khanna
- Department of Anesthesiology, Section on Critical Care Medicine, Wake Forest School of Medicine, Atrium Health Wake Forest Baptist Medical Center, Winston-Salem, North Carolina
- Outcomes Research Consortium, Cleveland, Ohio, USA
- Perioperative Outcomes and Informatics Collaborative, Winston-Salem, North Carolina, USA
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Simić M, Stavrakis AK, Sinha A, Premčevski V, Markoski B, Stojanović GM. Portable Respiration Monitoring System with an Embroidered Capacitive Facemask Sensor. BIOSENSORS 2022; 12:bios12050339. [PMID: 35624640 PMCID: PMC9138658 DOI: 10.3390/bios12050339] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/11/2022] [Accepted: 05/13/2022] [Indexed: 05/27/2023]
Abstract
Respiration monitoring is a very important indicator of health status. It can be used as a marker in the recognition of a variety of diseases, such as sleep apnea, asthma or cardiac arrest. The purpose of the present study is to overcome limitations of the current state of the art in the field of respiration monitoring systems. Our goal was the development of a lightweight handheld device with portable operation and low power consumption. The proposed approach includes a textile capacitive sensor with interdigitated electrodes embroidered into the facemask, integrated with readout electronics. Readout electronics is based on the direct interface of the capacitive sensor and a microcontroller through just one analog and one digital pin. The microcontroller board and sensor are powered by a smartphone or PC through a USB cable. The developed mobile application for the Android™ operating system offers reliable data acquisition and acts as a bridge for data transfer to the remote server. The embroidered sensor was initially tested in a humidity-controlled chamber connected to a commercial impedance analyzer. Finally, in situ testing with 10 volunteering subjects confirmed stable operation with reliable respiration monitoring.
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Affiliation(s)
- Mitar Simić
- Faculty of Technical Sciences, University of Novi Sad, 21000 Novi Sad, Serbia; (M.S.); (A.K.S.); (A.S.); (G.M.S.)
| | - Adrian K. Stavrakis
- Faculty of Technical Sciences, University of Novi Sad, 21000 Novi Sad, Serbia; (M.S.); (A.K.S.); (A.S.); (G.M.S.)
| | - Ankita Sinha
- Faculty of Technical Sciences, University of Novi Sad, 21000 Novi Sad, Serbia; (M.S.); (A.K.S.); (A.S.); (G.M.S.)
| | - Velibor Premčevski
- Technical Faculty Mihajlo Pupin, University of Novi Sad, 21000 Zrenjanin, Serbia;
| | - Branko Markoski
- Technical Faculty Mihajlo Pupin, University of Novi Sad, 21000 Zrenjanin, Serbia;
| | - Goran M. Stojanović
- Faculty of Technical Sciences, University of Novi Sad, 21000 Novi Sad, Serbia; (M.S.); (A.K.S.); (A.S.); (G.M.S.)
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