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Experimental Measurement of Diffusion Coefficient of Polyimide Film for Capacitive Humidity Sensors

Polyimide (PI) film is widely used as the key component of the capacitive humidity sensor, whose diffusion coefficient has a significant impact on the sensor’s dynamic characteristics, but is rarely discussed. This paper provides a test method and processes for effective diffusion coefficients of wa...

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Detalles Bibliográficos
Autores principales: Wu, Jianyun, Zhou, Wenhe, Wang, Xiaowei, Li, Shicheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9693837/
https://www.ncbi.nlm.nih.gov/pubmed/36433037
http://dx.doi.org/10.3390/polym14224910
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author Wu, Jianyun
Zhou, Wenhe
Wang, Xiaowei
Li, Shicheng
author_facet Wu, Jianyun
Zhou, Wenhe
Wang, Xiaowei
Li, Shicheng
author_sort Wu, Jianyun
collection PubMed
description Polyimide (PI) film is widely used as the key component of the capacitive humidity sensor, whose diffusion coefficient has a significant impact on the sensor’s dynamic characteristics, but is rarely discussed. This paper provides a test method and processes for effective diffusion coefficients of water molecules in self-synthesis PI films. The films were formed by four ingredients (PMDA-ODA, BPDA-ODA and BPDA-BAPP, PMDA-BAPP) with PI acid concentrations of 23%, 20%, 17% and 15%, and tested in temperatures of 20 °C, 35 °C and 50 °C, respectively. The results indicated that BPDA-BAPP film was good as a moisture sensitive film, whose average effective diffusion coefficient was 2.709 × 10(−14) m(2)/s. The temperature of the environment had a significant effect on the humidity-sensitive properties, but the PI acid concentration effect could be indirect.
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spelling pubmed-96938372022-11-26 Experimental Measurement of Diffusion Coefficient of Polyimide Film for Capacitive Humidity Sensors Wu, Jianyun Zhou, Wenhe Wang, Xiaowei Li, Shicheng Polymers (Basel) Article Polyimide (PI) film is widely used as the key component of the capacitive humidity sensor, whose diffusion coefficient has a significant impact on the sensor’s dynamic characteristics, but is rarely discussed. This paper provides a test method and processes for effective diffusion coefficients of water molecules in self-synthesis PI films. The films were formed by four ingredients (PMDA-ODA, BPDA-ODA and BPDA-BAPP, PMDA-BAPP) with PI acid concentrations of 23%, 20%, 17% and 15%, and tested in temperatures of 20 °C, 35 °C and 50 °C, respectively. The results indicated that BPDA-BAPP film was good as a moisture sensitive film, whose average effective diffusion coefficient was 2.709 × 10(−14) m(2)/s. The temperature of the environment had a significant effect on the humidity-sensitive properties, but the PI acid concentration effect could be indirect. MDPI 2022-11-14 /pmc/articles/PMC9693837/ /pubmed/36433037 http://dx.doi.org/10.3390/polym14224910 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
Wu, Jianyun
Zhou, Wenhe
Wang, Xiaowei
Li, Shicheng
Experimental Measurement of Diffusion Coefficient of Polyimide Film for Capacitive Humidity Sensors
title Experimental Measurement of Diffusion Coefficient of Polyimide Film for Capacitive Humidity Sensors
title_full Experimental Measurement of Diffusion Coefficient of Polyimide Film for Capacitive Humidity Sensors
title_fullStr Experimental Measurement of Diffusion Coefficient of Polyimide Film for Capacitive Humidity Sensors
title_full_unstemmed Experimental Measurement of Diffusion Coefficient of Polyimide Film for Capacitive Humidity Sensors
title_short Experimental Measurement of Diffusion Coefficient of Polyimide Film for Capacitive Humidity Sensors
title_sort experimental measurement of diffusion coefficient of polyimide film for capacitive humidity sensors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9693837/
https://www.ncbi.nlm.nih.gov/pubmed/36433037
http://dx.doi.org/10.3390/polym14224910
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