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Radio Frequency Resonator-Based Flexible Wireless Pressure Sensor with MWCNT-PDMS Bilayer Microstructure

Flexible pressure sensors have been widely applied in wearable devices, e-skin, and the new generation of robots. However, most of the current sensors use connecting wires for energy supply and signal transmission, which presents an obstacle for application scenarios requiring long endurance and lar...

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Autores principales: Xu, Baochun, Li, Mingyue, Li, Min, Fang, Haoyu, Wang, Yu, Sun, Xun, Guo, Qiuquan, Wang, Zhuopeng, Liu, Yijian, Chen, Da
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8952374/
https://www.ncbi.nlm.nih.gov/pubmed/35334696
http://dx.doi.org/10.3390/mi13030404
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author Xu, Baochun
Li, Mingyue
Li, Min
Fang, Haoyu
Wang, Yu
Sun, Xun
Guo, Qiuquan
Wang, Zhuopeng
Liu, Yijian
Chen, Da
author_facet Xu, Baochun
Li, Mingyue
Li, Min
Fang, Haoyu
Wang, Yu
Sun, Xun
Guo, Qiuquan
Wang, Zhuopeng
Liu, Yijian
Chen, Da
author_sort Xu, Baochun
collection PubMed
description Flexible pressure sensors have been widely applied in wearable devices, e-skin, and the new generation of robots. However, most of the current sensors use connecting wires for energy supply and signal transmission, which presents an obstacle for application scenarios requiring long endurance and large movement, especially. Flexible sensors combined with wireless technology is a promising research field for realizing efficient state sensing in an active state. Here, we designed and fabricated a soft wireless passive pressure sensor, with a fully flexible Ecoflex substrate and a multi-walled carbon nanotube/polydimethylsiloxane (MWCNT/PDMS) bilayer pyramid dielectric structure. Based on the principle of the radio-frequency resonator, the device achieved pressure sensing with a changeable capacitance. Subsequently, the effect of the pyramid density was simulated by the finite element method to improve the sensitivity. With one-step embossing and spin-coating methods, the fabricated sensor had an optimized sensitivity of 14.25 MHz/kPa in the low-pressure range. The sensor exhibited the potential for application in limb bending monitoring, thus demonstrating its value for long-term wireless clinical monitoring. Moreover, the radio frequency coupling field can be affected by approaching objects, which provides a possible route for realizing non-contact sensing in applications such as pre-collision warning.
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spelling pubmed-89523742022-03-26 Radio Frequency Resonator-Based Flexible Wireless Pressure Sensor with MWCNT-PDMS Bilayer Microstructure Xu, Baochun Li, Mingyue Li, Min Fang, Haoyu Wang, Yu Sun, Xun Guo, Qiuquan Wang, Zhuopeng Liu, Yijian Chen, Da Micromachines (Basel) Article Flexible pressure sensors have been widely applied in wearable devices, e-skin, and the new generation of robots. However, most of the current sensors use connecting wires for energy supply and signal transmission, which presents an obstacle for application scenarios requiring long endurance and large movement, especially. Flexible sensors combined with wireless technology is a promising research field for realizing efficient state sensing in an active state. Here, we designed and fabricated a soft wireless passive pressure sensor, with a fully flexible Ecoflex substrate and a multi-walled carbon nanotube/polydimethylsiloxane (MWCNT/PDMS) bilayer pyramid dielectric structure. Based on the principle of the radio-frequency resonator, the device achieved pressure sensing with a changeable capacitance. Subsequently, the effect of the pyramid density was simulated by the finite element method to improve the sensitivity. With one-step embossing and spin-coating methods, the fabricated sensor had an optimized sensitivity of 14.25 MHz/kPa in the low-pressure range. The sensor exhibited the potential for application in limb bending monitoring, thus demonstrating its value for long-term wireless clinical monitoring. Moreover, the radio frequency coupling field can be affected by approaching objects, which provides a possible route for realizing non-contact sensing in applications such as pre-collision warning. MDPI 2022-03-01 /pmc/articles/PMC8952374/ /pubmed/35334696 http://dx.doi.org/10.3390/mi13030404 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xu, Baochun
Li, Mingyue
Li, Min
Fang, Haoyu
Wang, Yu
Sun, Xun
Guo, Qiuquan
Wang, Zhuopeng
Liu, Yijian
Chen, Da
Radio Frequency Resonator-Based Flexible Wireless Pressure Sensor with MWCNT-PDMS Bilayer Microstructure
title Radio Frequency Resonator-Based Flexible Wireless Pressure Sensor with MWCNT-PDMS Bilayer Microstructure
title_full Radio Frequency Resonator-Based Flexible Wireless Pressure Sensor with MWCNT-PDMS Bilayer Microstructure
title_fullStr Radio Frequency Resonator-Based Flexible Wireless Pressure Sensor with MWCNT-PDMS Bilayer Microstructure
title_full_unstemmed Radio Frequency Resonator-Based Flexible Wireless Pressure Sensor with MWCNT-PDMS Bilayer Microstructure
title_short Radio Frequency Resonator-Based Flexible Wireless Pressure Sensor with MWCNT-PDMS Bilayer Microstructure
title_sort radio frequency resonator-based flexible wireless pressure sensor with mwcnt-pdms bilayer microstructure
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8952374/
https://www.ncbi.nlm.nih.gov/pubmed/35334696
http://dx.doi.org/10.3390/mi13030404
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