Chloroform vapour sensor based on copper/polyaniline nanocomposite

Chemically synthesised copper/polyaniline (PANi) nanocomposite has been utilised as a chloroform sensor for ppm level vapour concentration. The response in terms of increase in dc electric resistance on exposure to chloroform vapours has been observed. The FT–IR spectra of nanocomposite on exposure to chloroform show remarkable modifications in the far IR region indicating the interaction of chloroform with metal cluster. It is believed that the sensing mechanism mainly involves adsorption–desorption of chloroform at metal cluster surfaces.