Preparation and Gas-Sensing Properties of CdFe₂O₄ Semiconductor Materials

Abstract:

The gas-sensing materials, CdFe₂O₄, were prepared by inverse titration chemical co-precipitation with FeSO₄⋅7H₂O and CdCl₂⋅2.5H₂O. After calcinations at 300° ~ 700°C for 1h, respectively, n-type semiconductor gas-sensing materials with inverse spinel structure were obtained. Effects of the calcining temperature on the phase constituents and microstructure were characterized. The crystallite size of powders sintered at 700°C for 1h is 82 nm and dispersity good. Sensors based on CdFe₂O₄ were fabricated, and the gas-sensing properties were determined for using reducing gases. The results demonstrated that the sensors based on CdFe₂O₄ had good sensitivity and good selectivity to C₂H₅OH at 400°C. The difference in response for various tested gases might be attributed to absorption of reducing gases and reaction between these gases and the absorbed oxygen.

• Periodical: Advanced Materials Research (Volume 412)
• Pages: 331-335
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.412.331
• Online since: November 2011
• Authors: Liu Fang Yang, Yu Lin Wang, Qing Hui Wang, Xu Xiao Yi
• Keywords: CdFe₂O₄, Co-Precipitation, Gas Sensor, Gas-Sensing Properties, Sensing Mechanism

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