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Capacitive Humidity Sensor Based on Carbon Black/Polyimide Composites
A novel capacitive humidity sensor based on carbon black/polyimide composites is presented in this paper. The details of the fabrication, sensor characteristics, and effect of the carbon black additive are described. It was confirmed that the polyimide composite filled with a tiny amount of carbon b...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8001880/ https://www.ncbi.nlm.nih.gov/pubmed/33799769 http://dx.doi.org/10.3390/s21061974 |
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author | Kim, Jihong Cho, Jang-Hoon Lee, Hyung-Man Hong, Sung-Min |
author_facet | Kim, Jihong Cho, Jang-Hoon Lee, Hyung-Man Hong, Sung-Min |
author_sort | Kim, Jihong |
collection | PubMed |
description | A novel capacitive humidity sensor based on carbon black/polyimide composites is presented in this paper. The details of the fabrication, sensor characteristics, and effect of the carbon black additive are described. It was confirmed that the polyimide composite filled with a tiny amount of carbon black was suitable for a humidity sensing dielectric. The humidity sensors with three different dielectrics, which were pure polyimide, 0.01 wt% carbon black/polyimide, and 0.05 wt% carbon black/polyimide, were fabricated by a micro-electro-mechanical-system (MEMS) process. As the amount of the carbon black additive increased, the sensitivity of the humidity sensor increased. The humidity sensor with 0.05 wt% of carbon black had a much higher sensitivity of 15.21% (20–80% RH, 0.2535%/% RH) than that of the sensor with pure polyimide, which was 9.73% (0.1622%/% RH). The addition of carbon black also led to an enhancement in the hysteresis and response speed. The hysteresis of the humidity sensor decreased from 2.17 to 1.80% when increasing the amount of the carbon black additive. The response speed of the humidity sensor with 0.05 wt% of carbon black was measured to be ~10% faster than that of the sensor with pure polyimide. The long-term stability of the humidity sensors was demonstrated as well. |
format | Online Article Text |
id | pubmed-8001880 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-80018802021-03-28 Capacitive Humidity Sensor Based on Carbon Black/Polyimide Composites Kim, Jihong Cho, Jang-Hoon Lee, Hyung-Man Hong, Sung-Min Sensors (Basel) Communication A novel capacitive humidity sensor based on carbon black/polyimide composites is presented in this paper. The details of the fabrication, sensor characteristics, and effect of the carbon black additive are described. It was confirmed that the polyimide composite filled with a tiny amount of carbon black was suitable for a humidity sensing dielectric. The humidity sensors with three different dielectrics, which were pure polyimide, 0.01 wt% carbon black/polyimide, and 0.05 wt% carbon black/polyimide, were fabricated by a micro-electro-mechanical-system (MEMS) process. As the amount of the carbon black additive increased, the sensitivity of the humidity sensor increased. The humidity sensor with 0.05 wt% of carbon black had a much higher sensitivity of 15.21% (20–80% RH, 0.2535%/% RH) than that of the sensor with pure polyimide, which was 9.73% (0.1622%/% RH). The addition of carbon black also led to an enhancement in the hysteresis and response speed. The hysteresis of the humidity sensor decreased from 2.17 to 1.80% when increasing the amount of the carbon black additive. The response speed of the humidity sensor with 0.05 wt% of carbon black was measured to be ~10% faster than that of the sensor with pure polyimide. The long-term stability of the humidity sensors was demonstrated as well. MDPI 2021-03-11 /pmc/articles/PMC8001880/ /pubmed/33799769 http://dx.doi.org/10.3390/s21061974 Text en © 2021 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Communication Kim, Jihong Cho, Jang-Hoon Lee, Hyung-Man Hong, Sung-Min Capacitive Humidity Sensor Based on Carbon Black/Polyimide Composites |
title | Capacitive Humidity Sensor Based on Carbon Black/Polyimide Composites |
title_full | Capacitive Humidity Sensor Based on Carbon Black/Polyimide Composites |
title_fullStr | Capacitive Humidity Sensor Based on Carbon Black/Polyimide Composites |
title_full_unstemmed | Capacitive Humidity Sensor Based on Carbon Black/Polyimide Composites |
title_short | Capacitive Humidity Sensor Based on Carbon Black/Polyimide Composites |
title_sort | capacitive humidity sensor based on carbon black/polyimide composites |
topic | Communication |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8001880/ https://www.ncbi.nlm.nih.gov/pubmed/33799769 http://dx.doi.org/10.3390/s21061974 |
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