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《Rare Metal Materials and Engineering》 2005-09
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Preparation and CO Sensitivity of Nanocrystalline La_(0.7)Pb_(0.3)FeO_3-Based Gas Sensor

Song Peng, Qin Hongwei, Zhang Ling, Jiang Minhua, Hu Jifan (Shandong University, Jinan 250100, China)  
This paper reports that nano- La0.7Pb0.3FeO3 powders can be used as a new type of gas-sensing material for detecting CO. The La0.7Pb0.3FeO3 powders were prepared by a citric method. The powders are characterized by X-ray diffraction, showing that the La0.7Pb0.3FeO3 is still perovskite phase with orthorhombic structure and its crystallite size is about 17 nm, smaller than that of LaFeO3. The La0.7Pb0.3FeO3 is a kind of p-type semiconductive material, and its conductivity is higher than that of LaFeO3. The CO sensitivity of La0.7Pb0.3FeO3-based sensor is investigated. We found that La3+ partly substituted by Pb2+ in LaFeO3 can enhance its sensitivity for CO gas.
【Fund】: 国家自然科学基金资助项目(59772040)
【CateGory Index】: TB383;
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