Sensors & Transducers Journal (ISSN 1726- 5479) |
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Sensors & Transducers Journal 2008 Sensors & Transducers Journal 2007 2000-2002 S&T e-Digest Contents
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Vol. 113, Issue 2, February 2010, pp. 33-40
Humidity Response of Polyaniline Based Sensor
Mamta PANDEY, Atul SRIVASTAVA, Anchal SRIVASTAVA, *Rajesh Kumar SHUKLA
Department of Physics, University of Lucknow, Lucknow-226007, India
Tel.: 91-9451309994
*E-mail: rkshukla.lu@gmail.com
Received: 27 January 2010 /Accepted: 19 February 2010 /Published: 26 February 2010
Abstract: This paper presents hitherto unreported humidity sensing capacity of emeraldine salt form of polyaniline. Humidity plays a major role in different processes in industries ranging from food to electronic goods besides human comfort and therefore its monitoring is an essential requirement during various processes. Polyaniline has a wide use for making sensors as it can be easily synthesized and has long stability. Polyaniline is synthesized here by chemical route and is found to sense humidity as it shows variation in electrical resistance with variation in relative humidity. Results are presented here for a range of 15 to 90 RH%. The resistance falls from 5.8 to 0.72 Giga ohms as RH varies from 15 to 65 % and then falls to 13.9 Mega ohms as RH approaches 90 %. The response and recovery times are also measured.
Keywords: Humidity sensor, Scanning electron microscopy, FTIR spectra
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