S.A. WAGHULEY*, S.M. YENORKAR, S.S. YAWALE and S.P. YAWALE

Department of Physics, Government Vidarbha Institute of Science and Humanities,

Amravati, 444 604, India

*Corresponding author Tel.: +91-09432124882

E-mail: sawaghuley@indiatimes.com, spyawale@rediffmail.com

Received: 20 April 2007 /Accepted: 11 May 2007 /Published: 31 May 2007

Abstract: Tin dioxide (SnO2) plays a dominant role in solid state gas sensors and exhibit sensitivity towards oxidizing and reducing gases by a variation of its electrical properties. The electrical conducting polymer-polypyrrole (PPy) has high anisotropy of electrical conduction and used as a gas sensor. SnO2/PPy multilayer, pure SnO2, pure PPy sensors were prepared by screen-printing method on Al2O3 layer followed by glass substrate. The sensors were used for different concentration (ppm) of CO2 gas investigation at room temperature (303 K). The sensitivity of SnO2/PPy multilayer sensor was found to be higher, compared with pure SnO2 and pure PPy sensors. The multilayer sensor exhibited improved stability. The response and recovery time of multilayer sensor were found to be ~2 min and ~10 min respectively.

Keywords: Tin dioxide, Polypyrrole, Multilayer sensor, CO₂

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