Preparation and characterization of nanocrystalline α-Fe2O3 by a sol-gel process

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Abstract

α-Fe2O3 ultra-fine powder with an average particle size of 6–26nm has been prepared by a sol-gel process. Thermal analysis, X-ray diffraction and transmission electron microscope were used to study its formation process and micro-structure. The temperature dependence of the electric conductance of the elements made of nanocrystalline α-Fe2O3 shows that the gas-sensing properties are strongly related to its surface. The elements exhibited good sensitivity and selectivity to ethyl alcohol, indicating it is a promising alcohol-sensing material.

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Xingqin Liu: female, born in 1945. Associated Professor Project director of ‘Gas sensing materials’. Graduated in 1969 and since then became faculty member of University of Science and Technology of China (USTC). Visiting scientist at R. & D. Lab. of Hitachi Chemicals Co. (Japan) in 1988–1989, and doing cooperation research at Twente University, The Netherlands in 1992. Research area: Ceramics, gas sensing semiconductor and devices. Publication papers over 25.

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Xingqin Liu: female, born in 1945. Associated Professor Project director of ‘Gas sensing materials’. Graduated in 1969 and since then became faculty member of University of Science and Technology of China (USTC). Visiting scientist at R. & D. Lab. of Hitachi Chemicals Co. (Japan) in 1988–1989, and doing cooperation research at Twente University, The Netherlands in 1992. Research area: Ceramics, gas sensing semiconductor and devices. Publication papers over 25.

Shanwen Tao: male, born in 1967, PhD student. Research topic: Nanocrystalline oxide semiconductors and gas sensing property. Supervisor: Professor G.Y. Meng, and Professor X.Q. Liu.

Yusheng Shen: male, born in 1932, Professor. Graduated from Jilin University and majored in inorganic chemistry, has been the director of Gas sensing materials group at USTC for more than ten years. The head Councillor of Chemical Sensor Division, Chinese Sensor and Transducer Soc. over 120 publications.

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