Gas sensing properties of the mixed molybdenum tungsten oxide, W0.9Mo0.1O3

The mixed oxide W0.9Mo0.1O3 responds sensitively to oxidizing gases such as ozone and NOx in air and suffers only a mild interference from changes in relative humidity. The mixed oxide has a small activation energy for conduction (0.1 eV) and an unusual concentration dependence of response at low temperatures. Possible response mechanisms are considered.