Preparation and Bifunctional Gas Sensing Properties of Porous In2O3−CeO2 Binary Oxide Nanotubes

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State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, People’s Republic of China
*To whom correspondence should be addressed. E-mail: [email protected]. Tel./Fax: 86-431-85155129.
Cite this: Inorg. Chem. 2010, 49, 22, 10590–10597
Publication Date (Web):October 15, 2010
Copyright © 2010 American Chemical Society
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The porous binary In2O3−CeO2 oxides nanotubes (NTs) in cubic phase were first fabricated by electrospinning (ESP) method and characterized by SEM, TEM, XRD, XPS and UV−vis absorption techniques. By adjusting the In2O3 and CeO2 molar ratio, the out diameters and wall thicknesses of the final composites were tuned ranging of 90−180 nm and 15−9 nm, respectively. The band gap of the binary oxides gradually decreases, and the ratio of Ce3+ to Ce4+ increases with the increase of CeO2, implying that surface oxygen vacancies gradually increase. The gas sensing test reveals that when the content of CeO2 is appropriate, the as fabricated In2O3−CeO2 NTs could be bifunctional gas sensors to detect H2S at low temperature(25−110 °C) while acetone at relative high temperature (300 °C). The In75Ce25 NTs sensor is an optimum one, which exhibits the highest response of 498 to H2S at 80 °C and the highest response of 30 to acetone at 300 °C. In contrast to the pure In2O3 sensor, the response and recovery times, as well as the sensing reaction barrier height, for In75Ce25 both degrade considerably. The above temperature-dependent sensing properties were attributed to two different gas sensing mechanisms, sulfuration at low temperature and adsorption at high temperature.

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