Abstract:This study used a single metal oxide semiconductor (MOS) sensor to classify the major odorous gases hydrogen sulfide (H 2 S), ammonia (NH 3 ) and toluene (C 6 H 5 CH 3 ). In order to classify these odorous substances, the voltage on the MOS sensor heater was gradually reduced in 0.5 V steps 5.0 V to examine the changes to the response by the cooling effect on the sensor as the voltage decreased. The hydrogen sulfide gas showed the highest sensitivity compared to odorless air under approximately 2.5 V and the a… Show more
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