Oxygen interaction with CdS based gas sensors by varying different preparation parameters

The interaction of oxygen gas atmosphere on CdS films prepared by spray pyr olysis is studied. Spray time and deposition temperature are taken as varia ble parameters. The prepared film structure is diagnosed by XRD to elucidat e the film crystallinity. nature and size. Both thickness and crystallite s ize of the CdS films decrease as the deposition temperature increase from 3 40 to 490 degrees C at constant deposition time. The opposite trend is obse rved when the films are deposited at different deposition time and constant deposition temperature. The resistance of films were measured by exposing them to different concentrations of oxygen to rest its use as oxygen sensor . The thinner CdS films show higher sensitivity and shorter response time t han the thicker films.