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 two similar gases, ethanol and iso-propyl alcohol. The sensors are able to discriminate effectively between these two gases. The origin of this discriminatory behavior is elucidated through understanding the diffusion and reaction processes occurring in the zeolite transformation layer and sensor element.
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