Behaviour of electroconductive polyaniline films used in highly sensitive ammonia sensors

Electroconductive polymer based gas sensors have been investigated focusing on the resistance changes when exposing them to an ammonia atmosphere. At first, the resistance increase of these devices in air after manufacturing then, the changes in resistance after exposing them to ammonia of different concentration were examined. These phenomena and also the curing method of the polymer film prepared by electrochemical polymerisation are described and examined here. The main topic of this paper is what kind of problems we must face during signal processing of the responses given by this type of device when designing an accurate concentration measuring system.