Electrospun TiO2 nanofiber-based chemoresistive sensors

Abstract

Poly(vinyl acetate)/TiO2 composite nanofiber mats were formed onto a pair of interdigitated Au electrodes by electrospinning a solution of poly(vinyl acetate) and titanium tetraisopropoxide. Nanostructured anatase TiO2 sensing layer was obtained through subsequent hot-pressing at 110℃ and calcination at 500℃ in air for 1h. The active film exhibited n-type semiconducting characteristics, and its sensing capability was evaluated upon exposure of ammonia vapors. Furthermore, the surface of the electrospun TiO2 mat was decorated with additional gold nanoparticles or conducting polymer. These novel materials were also characterized and evaluated in terms of material and gas-sensing properties.