In2O3/CdO复合材料的制备及气敏特性

doi:10.3866/PKU.WHXB201204101

Abstract

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 words: Composite material, Gas sensor, Formaldehyde vapor, Nano-materials, Porous microstructure

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

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Synthesis and Gas Sensitivity of In₂O₃/CdO Composite

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