Ozone Detection In The Ppb- Range With Workfunction Sensors Operating At Room Temperature

Thin evaporated films of potassium iodide (KI) are highly sensitive to ozone in workfunction measurements. Among various other materials KI is well suited for limit detection in the ppb- range in normal humid air with work function sensors like SGFET. The cross-sensitivities to other oxidants are comparatively small which is due to a redox system of highly oxidated states on the layer surface as is found by XPS analysis.