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The Preparation and Gas-sensing Property of Nanosize γ-Fe2O3/SiO2

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【作者】 马丽景； 闫涛； 白守礼； 黄小葳； 宋永吉； 陈霭璠； LIU Chung Chium；

【Author】 MA Lijing YAN Tao BAI Shouli HUANG XiaoweiSONG Yongji CHEN Aifan and LIU Chung Chium College of Science, Beijing University of Chemical Technology, Beijing 100029, China College of Material and Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617,China Department of Chemical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA

【机构】 College of Science； Beijing University of Chemical Technology； Beijing 100029； China； College of Material and Chemical Engineering； Beijing Institute of Petrochemical Technology； Beijing 102617； Department of Chemical Engineering； Case Western Reserve University； Cleveland； OH 44106； USA；

【摘要】 <正> Nanostructured γ-Fe2O3/SiO2 complex oxide was prepared by sol-gel method with tetraethoxysilane and iron nitrate as precursors. The particle size distribution, thermal and phase stabilities and gas sensing properties were systematically characterized by TEM, granularity distribution, TG-DTA, XRD and gas sensitivity measure-ments. The particle size is about 10 nm and size distribution is very narrow. The sensitivity of the sensing element to CO, H2, C2H4, C6H6 and the effects of calcination temperature on the sensitivity and conductance of gases were examined. The combination of excellent thermal stability and tunable gas sensing properties through careful control of the preparation and judicious selection of material compositions gives rise to novel nanocomposites, which is attractive for the sensitive and selective detection of reducing gases and some hydrocarbon gases.

【Abstract】 Nanostructured γ-Fe2O3/SiO2 complex oxide was prepared by sol-gel method with tetraethoxysilane and iron nitrate as precursors. The particle size distribution, thermal and phase stabilities and gas sensing properties were systematically characterized by TEM, granularity distribution, TG-DTA, XRD and gas sensitivity measure-ments. The particle size is about 10 nm and size distribution is very narrow. The sensitivity of the sensing element to CO, H2, C2H4, C6H6 and the effects of calcination temperature on the sensitivity and conductance of gases were examined. The combination of excellent thermal stability and tunable gas sensing properties through careful control of the preparation and judicious selection of material compositions gives rise to novel nanocomposites, which is attractive for the sensitive and selective detection of reducing gases and some hydrocarbon gases.

【关键词】 nanostructural composites； Fe2O3； SiO2； gas-sensing properties；
【Key words】 nanostructural composites； Fe2O3； SiO2； gas-sensing properties；
【基金】 Supported by the National Natural Science Foundation of China (No. 20377004) and Beijing Natural Science Foundation (No. 2032014, No. 8032007).
  • 【文献出处】 Chinese Journal of Chemical Engineering ,中国化学工程学报(英文版) , 编辑部邮箱 ,2004年02期
  • 【分类号】O614
  • 【被引频次】7
  • 【下载频次】79
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