Oscillation phenomenon in ThO2-doped SnO2 exposed to CO gas

Abstract
In the ThO2‐doped SnO2 a new self‐oscillation phenomenon has been found only when it is exposed to CO gas. This phenomenon is related to the environmental CO gas concentration, substrate temperature, and applied voltage. The oscillation is extremely senstivie to the concentration of CO gas, especially in the region of 0.2‐0.3%.