Gas Sensing Properties of Composite Tungsten Trioxide-Zeolite Thick Films

Abstract

The effectiveness of using zeolites as a method of improving selectivity in semiconducting metal oxide gas sensor responses to different test gases is demonstrated. Screen printed tungsten trioxide thick films overlaid with the hydrogen form of four types of zeolites were tested to different concentrations of nitrogen dioxide, ethanol and carbon monoxide. The sensing results were shown to be reproducible with gas specific enhanced and diminished responses, which indicate that an array of highly discriminating composite metal oxide-zeolite sensors could be produced for electronic nose applications.