Vol. 107, Issue 8, August 2009, pp. 77-85

Humidity Sensing Behavior of Polyaniline / Strontium Arsenate Composites

¹Machappa T., ²M. Sasikala, ³Koppalkar R. Anilkumar,
^3,*M. V. N. Ambika Prasad

¹Department of Physics, Gulbarga University, Gulbarga 585 106, India

²Noble College of Engineering and Technology for Women, Nadergul, R R Dist, A.P., India

³Department of Materials Science, Gulbarga University, Gulbarga 585 106, India

Tel.:+91 9448405817, fax: +91 8472 263206

E-mail: Prasad1_Amb@rediffmail.com

Received: 12 April 2009   /Accepted:  15 August 2009   /Published:  25 August 2009

Abstract: The response of conducting Polyaniline (PANI) / Ceramic (Sr₃(AsO₄)₂) composites system to air moisture environment is studied. The conducting PANI and its composites are prepared by in situ polymerization technique. These prepared samples were characterized by XRD, FTIR & SEM, which confirms crystallinity, composite formation and porosity of the samples. The temperature dependent conductivity measurement shows the thermally activated behavior, where the conductivity increases with increase in temperature. The decrease in electrical resistance with change in relative humidity (RH) over broad range (ranging between 20 to 95 %) is due to the increase in surface electrical conductivity resulting from moisture absorption and due to capillary condensation of water causing increase in conductivity within the sensing materials.

Keywords: Polyaniline, Ceramic, Strontium arsenate, Humidity sensor, Time response

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