无机材料学报

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La0.68Pb0.32FeO3纳米材料在低工作温度条件下对CO气体的气敏性研究

张玲; 胡季帆; 秦宏伟; 宋鹏; 蒋民华   

  1. 山东大学晶体材料国家重点实验室和物理系, 济南 250100
  • 收稿日期:2004-10-29 修回日期:2004-12-17 出版日期:2005-11-20 网络出版日期:2005-11-20

Gas-sensing Properties of La0.68Pb0.32O3 Nano-materials under Low Operating Temperature

ZHANG Ling; HU Ji-Fan; QIN Hong-Wei; SONG Peng; JIANG Min-Hua   

  1. State Key Laboratory of Crystal Materials and Department of Physics; Shandong University; Jinan 250100, China
  • Received:2004-10-29 Revised:2004-12-17 Published:2005-11-20 Online:2005-11-20

摘要: 采用sol-gel法制备了具有正交钙钛矿结构的La0.68Pb0.32FeO3和LaFeO3纳米粉体.用该粉体制成气敏元件,并测试了该粉体材料在CO气体中的气敏特性,测试结果表明: 与LaFeO3相比,La0.68Pb0.32FeO3具有更小的粒径、较大的电导值、对CO气体具有更好的气敏性能,特别是工作温度大大降低.与空气中相比,在CO气体中,材料La0.68Pb0.32FeO3 的导电激活能增大.

关键词: 钙钛矿结构, 纳米材料, 气敏

Abstract: The La0.68Pb0.32FeO3 sample with an orthogonal perovskite structure was prepared by using the sol-gel method. The gas-sensing properties were studied in CO gas. The experimental results reveal that the La0.68Pb0.32FeO3 sample shows smaller grain sizes, higher conductance and higher sensitivity to CO gas, especially the much lower operating temperature compared with LaFeO3 sample. The activation energy for La0.68Pb0.32FeO3 sample in CO gas is higher than that in air.

Key words: perovskite structure, nano-materials, gas-sensing

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