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Abnormal gas sensing characteristics arising from catalyzed morphological changes of ionsorbed oxygen
Xin-Yu Xue1, Zhao-Hui Chen, Yu-Jin Chen
1College of Sciences, Northeastern University, Shenyang, People's Republic of China. xuexinyu@mail.neu.edu.cn
Abstract:
Abnormal gas sensing characteristics are observed at low temperature in uniformly loaded Pt@SnO(2) nanorod gas sensors. The sensors operated at 200 degrees C exhibit opposite variations of resistances, and the change of resistance decreases with increasing ethanol concentration. In contrast, the sensors operated at 300 degrees C show regular behavior and the sensitivity is extremely high. Such behaviors are ascribed to Pt-catalyzed morphological changes of ionsorbed oxygen at low temperature. The present results are the bases for further investigating the effect of ionsorbed oxygen morphologies on gas sensing.
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