CeO2 doped SnO2 sensor selective to ethanol in presence of CO, LPG and CH4

Abstract In the present study, the sensitivity of SnO 2 and CeO 2 /SnO 2 sensors to ethanol in the presence of CO, LPG and CH 4 gases were examined. SnO 2 and CeO 2 /SnO 2 were prepared by a sol–gel method and sintered at 600 and 800 °C. As SnO 2 is doped with 2.0 wt.% ceria, at 300 °C, the sensitivity to ethanol with respect to methane, LPG and CO is enhanced by factors of about 5.3, 48.2 and 5.2, respectively. As the temperature is increased to 350 °C, the ceria-doped SnO 2 becomes more sensitive to CO and LPG. The results revealed that, for all gases, the sensitivity of the sensors sintered at 600 °C was higher than the ones sintered at 800 °C, however, the effect was much more pronounced with regards to ethanol. In addition, doping the SnO 2 sensor with CeO 2 reduces the long recovery time observed for pure SnO 2 sensor in presence of ethanol.

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