SnO/sub 2/ based sensors of smoke

This paper presents results of investigations of smoke sensitive characteristics of gas sensors based on SnO/sub 2/ thin films deposited on ceramic substrate by spray pyrolysis method. The temperature dependence of the resistance of such GS in a smoke atmosphere was studied. It was established that this dependence has two maximums of smoke sensitivity at 110-120/spl deg/C and 230-250/spl deg/C. The films have a sensitivity of about 15-60 arbitrary units of dependence on a smoke nature.