物理化学学报 >> 2006, Vol. 22 >> Issue (01): 114-117.doi: 10.3866/PKU.WHXB20060123

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不同方法掺杂Au对纳米α-Fe2O3气敏性能的影响

王燕; 景志红; 吴世华; 黄唯平; 张守民; 王淑荣   

  1. 南开大学化学学院, 天津 300071; 曲阜师范大学化学学院, 山东 曲阜 273165
  • 收稿日期:2005-06-21 修回日期:2005-09-01 发布日期:2006-01-15
  • 通讯作者: 吴世华 E-mail:wushh@nankai.edu.cn

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

摘要: 分别采用共沉淀法、浸渍法、紫外辐照法制备了掺杂不同Au含量的α-Fe2O3纳米粉体, 并制作了旁热式厚膜型气敏元件. 用XRD、TG-DTA和TEM技术对纳米晶的晶型、晶粒大小及形貌进行了表征. 考察了掺杂方法、Au含量及焙烧温度对α-Fe2O3气敏性能的影响. 结果表明, 采用三种方法掺杂适量Au后, 都使α-Fe2O3的气敏性有了显著提高, 其中采用共沉淀法, 在400 ℃焙烧的Au质量分数为1.5%的α-Fe2O3的气敏性最佳.

关键词: α-Fe2O3, 掺杂, 气敏性能, 共沉淀法, 浸渍法, 紫外辐照法

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