Abstract
The use of zeolites to enhance the response and discriminating power of solid state metal oxide semiconductor gas sensors is demonstrated. Thick film sensors were prepared by screen printing layers of tungsten trioxide (WO3) or chromium titanium oxide (CTO) with various zeolites as over-layers. The sensors' gas response was tested against carbon monoxide and ethanol in varying concentrations. The results show that in some cases the gas response is greatly enhanced and in other cases diminished; discriminatory behaviour that will be useful in electronic noses.
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