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Acta Phys. Chim. Sin.  2012, Vol. 28 Issue (06): 1539-1544    DOI: 10.3866/PKU.WHXB201204101
PHYSICAL CHEMISTRY OF MATERIALS     
Synthesis and Gas Sensitivity of In2O3/CdO Composite
CHEN Peng-Peng1, WANG Jing1, YAO Peng-Jun1,2, DU Hai-Ying1,3, LI Xiao-Gan1
1. School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning Province, P. R. China;
2. School of Educational Technology, Shenyang Normal University, Shenyang 110000, P. R. China;
3. Department of Electromechanical Engineering & Information, Dalian Nationalities University, Dalian 116600, Liaoning Province, P. R. China
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Abstract  Indium oxide (In2O3) was synthesized using a hydrothermal process. The crystallography and microstructure of the synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The In2O3 had a flower-like hierarchical nanostructure and was composed of tiny near-spherical crystals with a diameter of approximately 20 nm. When In2O3 was mixed with CdO in a 1:1 molar ratio, it was found that the resulting In2O3/CdO composite showed an interesting grape-like porous microstructure following calcinations at elevated temperatures. A gas sensor using this In2O3/CdO composite as the sensing material showed higher sensitivity to different concentration of formaldehyde than the gas sensor based on pure flower-like In2O3 nanomaterials. The In2O3/CdO-based sensors showed a high sensitivity to a concentration of 0.05×10-6 formaldehyde at the optimized operating temperature of 410 °C and a good level of selectivity over other possible interference gases such as ethanol, toluene, acetone, methanol, and ammonia. The gas sensing mechanism of In2O3/CdO sensor has been discussed in detail.

Key wordsComposite material      Gas sensor      Formaldehyde vapor      Nano-materials      Porous microstructure     
Received: 01 February 2012      Published: 10 April 2012
MSC2000:  O649.4  
Fund:  

The project was supported by the National Natural Science Foundation of China (61176068, 61131004, 61001054).

Corresponding Authors: Wang Jing     E-mail: wangjing@dlut.edu.cn
Cite this article:

CHEN Peng-Peng, WANG Jing, YAO Peng-Jun, DU Hai-Ying, LI Xiao-Gan. Synthesis and Gas Sensitivity of In2O3/CdO Composite. Acta Phys. Chim. Sin., 2012, 28(06): 1539-1544.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201204101     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2012/V28/I06/1539

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