Room temperature gas sensing properties of polypyrrole-gold nanocomposite thin film

Abstract

Thin films of polypyrrole and polypyrrole-gold nanocomposite were deposited on the still substrate by an electrochemical deposition technique. Electrical resistivity of both thin films were investigated which shows the ohmic nature with a decrease in resistivity in the polypyrrole-gold nanocomposite. Surface morphology of both samples represents the nanofiber like morphology randomly oriented on the still substrate whereas the presence of gold nanoparticles in polymer matrix was confirmed by EDAX spectrum. The room temperature gas sensing was studied in presence of 50 ppm of ammonia gas and enhancement in sensitivity was observed in the case of polypyrrole-gold nanocomposite.