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Design Rules for a Wearable Micro-Fabricated Piezo-Resistive Pressure Sensor

Wearable flexible piezo-resistive pressure sensors hold a wide-ranging potential in human health monitoring, electronic skin, robotic limbs, and other human–machine interfaces. Out of the most successful recent efforts for arterial pulse monitoring are sensors with micro-patterned conductive elastom...

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Detalles Bibliográficos
Autores principales: Jafarizadeh, Borzooye, Chowdhury, Azmal Huda, Khakpour, Iman, Pala, Nezih, Wang, Chunlei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9229048/
https://www.ncbi.nlm.nih.gov/pubmed/35744452
http://dx.doi.org/10.3390/mi13060838
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author Jafarizadeh, Borzooye
Chowdhury, Azmal Huda
Khakpour, Iman
Pala, Nezih
Wang, Chunlei
author_facet Jafarizadeh, Borzooye
Chowdhury, Azmal Huda
Khakpour, Iman
Pala, Nezih
Wang, Chunlei
author_sort Jafarizadeh, Borzooye
collection PubMed
description Wearable flexible piezo-resistive pressure sensors hold a wide-ranging potential in human health monitoring, electronic skin, robotic limbs, and other human–machine interfaces. Out of the most successful recent efforts for arterial pulse monitoring are sensors with micro-patterned conductive elastomers. However, a low-current output signal (typically in the range of nano-amperes) and bulky and expensive measurement equipment for useful signal acquisition inhibits their wearability. Herein, through a finite element analysis we establish the design rules for a highly sensitive piezo-resistive pressure sensor with an output that is high enough to be detectable by simple and inexpensive circuits and therefore ensure wearability. We also show that, out of four frequently reported micro-feature shapes in micro-patterned piezo-resistive sensors, the micro-dome and micro-pyramid yield the highest sensitivity. Furthermore, investigations of different conductivity values of micro-patterned elastomers found that coating the elastomer with a conductive material (usually metallic) leads to higher current response when compared to composited conductive elastomers. Finally, the geometric parameters and spatial configurations of micro-pyramid design of piezo-resistive sensors were optimized. The results show that an enhanced sensitivity and higher current output is achieved by the lower spatial density configuration of three micro-features per millimeter length, a smaller feature size of around 100 μm, and a 60–50 degrees pyramid angle.
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spelling pubmed-92290482022-06-25 Design Rules for a Wearable Micro-Fabricated Piezo-Resistive Pressure Sensor Jafarizadeh, Borzooye Chowdhury, Azmal Huda Khakpour, Iman Pala, Nezih Wang, Chunlei Micromachines (Basel) Article Wearable flexible piezo-resistive pressure sensors hold a wide-ranging potential in human health monitoring, electronic skin, robotic limbs, and other human–machine interfaces. Out of the most successful recent efforts for arterial pulse monitoring are sensors with micro-patterned conductive elastomers. However, a low-current output signal (typically in the range of nano-amperes) and bulky and expensive measurement equipment for useful signal acquisition inhibits their wearability. Herein, through a finite element analysis we establish the design rules for a highly sensitive piezo-resistive pressure sensor with an output that is high enough to be detectable by simple and inexpensive circuits and therefore ensure wearability. We also show that, out of four frequently reported micro-feature shapes in micro-patterned piezo-resistive sensors, the micro-dome and micro-pyramid yield the highest sensitivity. Furthermore, investigations of different conductivity values of micro-patterned elastomers found that coating the elastomer with a conductive material (usually metallic) leads to higher current response when compared to composited conductive elastomers. Finally, the geometric parameters and spatial configurations of micro-pyramid design of piezo-resistive sensors were optimized. The results show that an enhanced sensitivity and higher current output is achieved by the lower spatial density configuration of three micro-features per millimeter length, a smaller feature size of around 100 μm, and a 60–50 degrees pyramid angle. MDPI 2022-05-27 /pmc/articles/PMC9229048/ /pubmed/35744452 http://dx.doi.org/10.3390/mi13060838 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
Jafarizadeh, Borzooye
Chowdhury, Azmal Huda
Khakpour, Iman
Pala, Nezih
Wang, Chunlei
Design Rules for a Wearable Micro-Fabricated Piezo-Resistive Pressure Sensor
title Design Rules for a Wearable Micro-Fabricated Piezo-Resistive Pressure Sensor
title_full Design Rules for a Wearable Micro-Fabricated Piezo-Resistive Pressure Sensor
title_fullStr Design Rules for a Wearable Micro-Fabricated Piezo-Resistive Pressure Sensor
title_full_unstemmed Design Rules for a Wearable Micro-Fabricated Piezo-Resistive Pressure Sensor
title_short Design Rules for a Wearable Micro-Fabricated Piezo-Resistive Pressure Sensor
title_sort design rules for a wearable micro-fabricated piezo-resistive pressure sensor
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9229048/
https://www.ncbi.nlm.nih.gov/pubmed/35744452
http://dx.doi.org/10.3390/mi13060838
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