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An exploratory work was carried out for high sensitive semiconducting oxides to NO and NO2 in air. Out of 24 oxides examined, WO3 was found to give the most sensitive semiconductor sensor to both. NO ...and NO2: the WO3 sensor was excellent in sensitivity as well as in response and recovery characteristics in the temperature range of 200-500℃. The high sensitivity to NO is worthy of Special attention, because such properties have not attained with other oxides. Temperature programmed desorption chromatograms revealed that the WO3 surface accommodated only a trace amount of adsorbed oxygen while it did a considerable amount of NO adsorbates. This feature may be responsible for the high sensitivity to NO.show more
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