Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (01): 114-117.doi: 10.3866/PKU.WHXB20060123

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

WANG Yan; JING Zhi-hong; WU Shi-hua; HUANG Wei-ping; ZHANG Shou-min; WANG Shu-rong   

  1. College of Chemistry, Nankai University, Tianjin 300071, P. R. China; Department of Chemistry, Qufu Normal University, Qufu 273165, P. R. China
  • Received:2005-06-21 Revised:2005-09-01 Published:2006-01-15
  • Contact: WU Shi-hua E-mail:wushh@nankai.edu.cn

Abstract: 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.

Key words: α-Fe2O3, Dope, Gas-sensing property, Coprecipitation method, Impregnation method, Ultraviolet irradiation method