CONDUCTING POLYMERS OF ANILINE .2. A COMPOSITE AS A GAS SENSOR

The gas sensing ability of electrochemically prepared pure polyaniline and polyaniline-poly(bisphenol-A carbonate) films is investigated. Th e responses of the composite films to several vapours are more well de fined and reproducible compared to the pure conducting polymer. The ch anges in resistance as determined via the two-probe technique are well defined down to a level of 0.025% vol./vol. ammonia. The possible rea son for such a difference is discussed. The structure of the composite is examined through pyrolysis FT-IR studies.