Citation: CHEN Peng-Peng, WANG Jing, YAO Peng-Jun, DU Hai-Ying, LI Xiao-Gan. Synthesis and Gas Sensitivity of In₂O₃/CdO Composite[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1539-1544. doi: 10.3866/PKU.WHXB201204101 shu

Synthesis and Gas Sensitivity of In₂O₃/CdO Composite

1.
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

Received Date: 1 February 2012
Available Online: 10 April 2012
Fund Project: 国家自然科学基金(61176068, 61131004, 61001054)资助项目 (61176068, 61131004, 61001054)

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 od 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.
- Composite material,
- Gas sensor,
- Formaldehyde vapor,
- Nano-materials,
- Porous microstructure
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Synthesis and Gas Sensitivity of In₂O₃/CdO Composite