高等学校化学学报

高等学校化学学报

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Al掺杂α-Fe2O3材料的制备、表征和气敏特性

司书峰, 杨松林, 延玺   

  1. 北京师范大学化学系, 北京 100875
  • 收稿日期:2007-01-29 修回日期:1900-01-01 出版日期:2007-11-10 发布日期:2007-11-10
  • 通讯作者: 司书峰

Preparation, Characterization and Gas Responsibilities of Al Doped α-Fe2O3

SI Shu-Feng*, YANG Song-Lin, YAN Xi   

  1. Department of Chemistry, Beijing Normal University, Beijing 100875, China
  • Received:2007-01-29 Revised:1900-01-01 Online:2007-11-10 Published:2007-11-10
  • Contact: SI Shu-Feng

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被引次数

30

摘要： 采用均相沉淀法制备了纯α-Fe2O3(300 ℃煅烧)和Al掺杂α-Fe2O3(300和400 ℃煅烧), 使用SEM, XRD, ICP和红外光谱等手段进行表征, 并利用气敏仪测试无水乙醇和90＃汽油在不同条件下对材料的响应性能. 结果表明, 微量Al掺杂不改变α-Fe2O3材料的物相, 但会阻碍晶粒生长, 使颗粒变小及Fe2O3晶格间隙中的铁原子数目增多, 材料的导电率增大, 从而显著提高材料的气敏性能. Al掺杂α-Fe2O3对乙醇的响应性能优于对汽油的响应性能, 在乙醇气氛中, 材料对湿度仍然不敏感. 经400 ℃煅烧的Al掺杂α-Fe2O3稳定性较好, 可作为检测乙醇气体的半导体气敏材料.

关键词: Al掺杂, α-Fe2O3, 气体传感器, 可燃气体

Abstract: Pure and Al doped α-Fe2O3 materials were prepared by a solution phase controlled hydrolysis me-thod, and were characterized by XRD, SEM and ICP techniques. Gas-sensing properties were carried out on gas sensors from these materials under laboratory and humid conditions. The experiments indicate that the crystalline size of Al doped α-Fe2O3 materials is less than that of pure one, and their conductivity increases obviously; the resultant Al doped Fe2O3 gas sensor exhibites a high response and a short response/recovery time in the detection of low concentrations of various combustible gases. The Al doped Fe2O3 sintered at 400 ℃, which is more stable than one sintered at 300 ℃, is suitable as a gas sensor for ethanol alcohol.

Key words: Al doped, α-Fe2O3, Gas sensor, Combustible gas

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