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Citation: WANG Yan, JING Zhi-hong, WU Shi-hua, HUANG Wei-ping, ZHANG Shou-min, WANG Shu-rong. The Effect of Au-doping by Different Methods on Gas-sensing Properties of α-Fe₂O₃ Nanopowders[J]. Acta Physico-Chimica Sinica, ;2006, 22(01): 114-117. doi: 10.3866/PKU.WHXB20060123 shu

The Effect of Au-doping by Different Methods on Gas-sensing Properties of α-Fe₂O₃ Nanopowders

1.
College of Chemistry, Nankai University, Tianjin 300071, P. R. China; Department of Chemistry, Qufu Normal University, Qufu 273165, P. R. China

Received Date: 21 June 2005
Available Online: 15 January 2006

Au-doped α-Fe₂O₃ nanopowders were prepared by coprecipitation, impregnation, and ultraviolet irradiation methods, respectively. The Au/α-Fe₂O₃ nanopowders were characterized by TG-DTA, XRD, and TEM. The effects of dopping methods, the Au content, and the calcination temperature on gas-sensing properties of α-Fe₂O₃ were studied. The results showed that α-Fe₂O₃ sensors presented much higher sensitivity after doped with Au. Among them, the Au-doped α-Fe₂O₃ (w(Au)=1.5%, calcinated at 400 ℃) prepared by coprecipitation gave the best sensitivity.
- α-Fe₂O₃;Dope;Gas-sensing property;Coprecipitation method;Impregnation method;Ultraviolet irradiation method
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The Effect of Au-doping by Different Methods on Gas-sensing Properties of α-Fe₂O₃ Nanopowders