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Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer

Research on stretchable strain sensors is actively conducted due to increasing interest in wearable devices. However, typical studies have focused on improving the elasticity of the electrode. Therefore, methods of directly connecting wire or attaching conductive tape to materials to detect deformat...

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Autores principales: Choy, Ji-Yeon, Jo, Eun-Bee, Yim, Chang-Joo, Youi, Hae-Kyung, Hwang, Jung-Hoon, Lee, Jun-Ho, Kim, Hyun-Seok
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8778142/
https://www.ncbi.nlm.nih.gov/pubmed/35062593
http://dx.doi.org/10.3390/s22020630
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author Choy, Ji-Yeon
Jo, Eun-Bee
Yim, Chang-Joo
Youi, Hae-Kyung
Hwang, Jung-Hoon
Lee, Jun-Ho
Kim, Hyun-Seok
author_facet Choy, Ji-Yeon
Jo, Eun-Bee
Yim, Chang-Joo
Youi, Hae-Kyung
Hwang, Jung-Hoon
Lee, Jun-Ho
Kim, Hyun-Seok
author_sort Choy, Ji-Yeon
collection PubMed
description Research on stretchable strain sensors is actively conducted due to increasing interest in wearable devices. However, typical studies have focused on improving the elasticity of the electrode. Therefore, methods of directly connecting wire or attaching conductive tape to materials to detect deformation have been used to evaluate the performance of strain sensors. Polyaniline (PANI), a p-type semiconductive polymer, has been widely used for stretchable electrodes. However, conventional procedures have limitations in determining an appropriate metal for ohmic contact with PANI. Materials that are generally used for connection with PANI form an undesirable metal-semiconductor junction and have significant contact resistance. Hence, they degrade sensor performance. This study secured ohmic contact by adapting Au thin film as the metal contact layer (the MCL), with lower contact resistance and a larger work function than PANI. Additionally, we presented a buffer layer using hard polydimethylsiloxane (PDMS) and structured it into a dumbbell shape to protect the metal from deformation. As a result, we enhanced steadiness and repeatability up to 50% strain by comparing the gauge factors and the relative resistance changes. Consequently, adapting structural methods (the MCL and the dumbbell shape) to a device can result in strain sensors with promising stability, as well as high stretchability.
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spelling pubmed-87781422022-01-22 Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer Choy, Ji-Yeon Jo, Eun-Bee Yim, Chang-Joo Youi, Hae-Kyung Hwang, Jung-Hoon Lee, Jun-Ho Kim, Hyun-Seok Sensors (Basel) Article Research on stretchable strain sensors is actively conducted due to increasing interest in wearable devices. However, typical studies have focused on improving the elasticity of the electrode. Therefore, methods of directly connecting wire or attaching conductive tape to materials to detect deformation have been used to evaluate the performance of strain sensors. Polyaniline (PANI), a p-type semiconductive polymer, has been widely used for stretchable electrodes. However, conventional procedures have limitations in determining an appropriate metal for ohmic contact with PANI. Materials that are generally used for connection with PANI form an undesirable metal-semiconductor junction and have significant contact resistance. Hence, they degrade sensor performance. This study secured ohmic contact by adapting Au thin film as the metal contact layer (the MCL), with lower contact resistance and a larger work function than PANI. Additionally, we presented a buffer layer using hard polydimethylsiloxane (PDMS) and structured it into a dumbbell shape to protect the metal from deformation. As a result, we enhanced steadiness and repeatability up to 50% strain by comparing the gauge factors and the relative resistance changes. Consequently, adapting structural methods (the MCL and the dumbbell shape) to a device can result in strain sensors with promising stability, as well as high stretchability. MDPI 2022-01-14 /pmc/articles/PMC8778142/ /pubmed/35062593 http://dx.doi.org/10.3390/s22020630 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
Choy, Ji-Yeon
Jo, Eun-Bee
Yim, Chang-Joo
Youi, Hae-Kyung
Hwang, Jung-Hoon
Lee, Jun-Ho
Kim, Hyun-Seok
Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer
title Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer
title_full Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer
title_fullStr Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer
title_full_unstemmed Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer
title_short Improvement in Strain Sensor Stability by Adapting the Metal Contact Layer
title_sort improvement in strain sensor stability by adapting the metal contact layer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8778142/
https://www.ncbi.nlm.nih.gov/pubmed/35062593
http://dx.doi.org/10.3390/s22020630
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