高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (09): 1915.doi: 10.3969/j.issn.0251-0790.2012.09.007

• 研究论文: 无机化学 • 上一篇    下一篇

α-Fe2O3负载Ag复合纳米材料的制备、表征和气敏性能

马小东, 郭洪雯, 吕璐, 何璇, 冯玺   

  1. 环境污染过程与基准教育部重点实验室, 天津市城市生态环境修复与污染防治重点实验室, 南开大学环境科学与工程学院, 天津 300071
  • 收稿日期:2011-10-26 出版日期:2012-09-10 发布日期:2012-08-14
  • 通讯作者: 马小东,男,博士,副教授,主要从事纳米功能材料研究.E-mail:maxd@nankai.edu.cn E-mail:maxd@nankai.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20977052, 21177066)和天津市自然科学基金(批准号: 11JCYBJC05100)资助.

Preparation, Characterization and Gas Sensing Performance of Ag-supported α-Fe2O3 Hybrid

MA Xiao-Dong, GUO Hong-Wen, LÜ Lu, HE Xuan, FENG Xi   

  1. Key Laboratory of Environmental Pollution Process and Standard, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
  • Received:2011-10-26 Online:2012-09-10 Published:2012-08-14

摘要:

采用简单的FeCl3溶液水热方法, 结合焙烧处理合成了α-Fe2O3 纳米粉体; 以所制备的α-Fe2O3为载体负载Ag纳米粒子, 得到Ag/α-Fe2O3 复合纳米材料. 使用X射线衍射、 透射电子显微镜、 氮气吸附-脱附和X射线光电子能谱等对样品进行表征, 并考察了Ag/α-Fe2O3复合材料在260℃下对甲醇、 乙醇、 乙醚、 丙酮、 正丁醇和正己醇等挥发性有机物的气敏行为. 结果表明, Ag/α-Fe2O3传感器对这几种挥发性有机物展示了较高的灵敏度和快速、 可逆的响应-恢复特性; 与纯α-Fe2O3相比, Ag/α-Fe2O3复合材料的气敏性能显著提高, 这可能与该复合材料表面独特的多孔结构和活性Ag纳米粒子对敏感反应的催化作用有关.

关键词: Ag/α-Fe2O3, 气敏性, 挥发性有机物

Abstract:

α-Fe2O3 nanoparticles were synthesized by a simple hydrothermal treatment of FeCl3 solution, followed by a calcination process, without templates or pore-directing agents. The as-prepared α-Fe2O3 nanoparticles were further employed as support to obtain Ag/α-Fe2O3 hybrid. The hybrid was characterized by XRD, TEM and XPS techniques and its gas sensing performance was investigated for several volatile organic compounds(VOCs) including methanol, ethanol, ether, acetone, butanol and hexanol at an operating temperature of 260℃. The Ag/α-Fe2O3 sensor presented a high sensitivity and fast response-recovery to these VOCs. Meanwhile, the Ag/α-Fe2O3 sensor exhibited a much higher response than the pure α-Fe2O3 sensor at the operating temperature of 260℃, which may be related to the unique porous structure on the surface of the Ag/α-Fe2O3 hybrid and the catalytic action of active Ag nanoparticles for the sensing reactions.

Key words: Ag/α-Fe2O3, Gas sensor, Volatile organic compound

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