A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs)

A new type of capacitive humidity sensor is introduced in this paper. The sensor consists of two plate electrodes coated with MWCNT films and four pieces of isolating medium at the four corners of the sensor. According to capillary condensation, the capacitance signal of the sensor is sensitive to r...

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Detalles Bibliográficos
Autores principales: Chen, Wei-Ping, Zhao, Zhen-Gang, Liu, Xiao-Wei, Zhang, Zhong-Xin, Suo, Chun-Guang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International (MDPI) 2009
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3290510/
https://www.ncbi.nlm.nih.gov/pubmed/22400003
http://dx.doi.org/10.3390/s90907431
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author Chen, Wei-Ping
Zhao, Zhen-Gang
Liu, Xiao-Wei
Zhang, Zhong-Xin
Suo, Chun-Guang
author_facet Chen, Wei-Ping
Zhao, Zhen-Gang
Liu, Xiao-Wei
Zhang, Zhong-Xin
Suo, Chun-Guang
author_sort Chen, Wei-Ping
collection PubMed
description A new type of capacitive humidity sensor is introduced in this paper. The sensor consists of two plate electrodes coated with MWCNT films and four pieces of isolating medium at the four corners of the sensor. According to capillary condensation, the capacitance signal of the sensor is sensitive to relative humidity (RH), which could be transformed to voltage signal by a capacitance to voltage converter circuit. The sensor is tested using different saturated saline solutions at the ambient temperature of 25 °C, which yielded approximately 11% to 97% RH, respectively. The function of the MWCNT films, the effect of electrode distance, the temperature character and the repeatability of the sensor are discussed in this paper.
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spelling pubmed-32905102012-03-07 A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs) Chen, Wei-Ping Zhao, Zhen-Gang Liu, Xiao-Wei Zhang, Zhong-Xin Suo, Chun-Guang Sensors (Basel) Article A new type of capacitive humidity sensor is introduced in this paper. The sensor consists of two plate electrodes coated with MWCNT films and four pieces of isolating medium at the four corners of the sensor. According to capillary condensation, the capacitance signal of the sensor is sensitive to relative humidity (RH), which could be transformed to voltage signal by a capacitance to voltage converter circuit. The sensor is tested using different saturated saline solutions at the ambient temperature of 25 °C, which yielded approximately 11% to 97% RH, respectively. The function of the MWCNT films, the effect of electrode distance, the temperature character and the repeatability of the sensor are discussed in this paper. Molecular Diversity Preservation International (MDPI) 2009-09-16 /pmc/articles/PMC3290510/ /pubmed/22400003 http://dx.doi.org/10.3390/s90907431 Text en © 2009 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 license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Chen, Wei-Ping
Zhao, Zhen-Gang
Liu, Xiao-Wei
Zhang, Zhong-Xin
Suo, Chun-Guang
A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs)
title A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs)
title_full A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs)
title_fullStr A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs)
title_full_unstemmed A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs)
title_short A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs)
title_sort capacitive humidity sensor based on multi-wall carbon nanotubes (mwcnts)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3290510/
https://www.ncbi.nlm.nih.gov/pubmed/22400003
http://dx.doi.org/10.3390/s90907431
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