Electronic nose: A toxic gas sensor by polyaniline thin film conducting polymer

This paper presents study of toxic gas sensing property by polyaniline thin film conducting polymer for ammonia gas. In this work, the precipitate of the conducting polymer has been synthesized by chemical method. The conducting polymer film which acts as an active layer of sensor was prepared with the help of the precipitate (of the conducting polymer) by spin-coating technique. The deposited films were characterized by FTIR spectroscopy and four probe method. The study indicates that, the resistance of the film decreases with the increase in concentration of ammonia at the known volume.