H/sub 2/S gas detection by ZrO-doped SnO/sub 2/

The authors report on the fabrication of H/sub 2/S gas sensors made of SnO/sub 2/ mixed with ZrO/sub 2/. Their sensitivities, responses, and selectivities to H/sub 2/S are presented. A 10-p.p.m. concentration of H/sub 2/S gas changes the sensor resistivity to a value 300 times lower than that for air around 175 degrees C. The sensors exhibit highly selective detection of H/sub 2/S in an atmosphere containing H/sub 2/S and H/sub 2/. The mechanism of the reaction between the sensors and H/sub 2/S are also discussed.<
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