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納米晶La_(0.7)Pb_(0.3)FeO_3的制備 及其對(duì)CO敏感特性的研究
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國(guó)家自然科學(xué)基金資助項(xiàng)目(59772040)


Preparation and CO Sensitivity of Nanocrystalline La_(0.7)Pb_(0.3)FeO_3-Based Gas Sensor
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    摘要:

    利用溶膠-凝膠法制備了納米晶La0.7Pb0.3FeO3氣敏材料,并對(duì)其相組成、電導(dǎo)及其對(duì)CO氣敏性能進(jìn)行了研究。XRD結(jié)果表明:摻鉛固溶體La0.7Pb0.3FeO3仍為正交晶系鈣鈦礦結(jié)構(gòu),粒徑約為17nm,低于純相LaFeO3的粒徑31nm。電導(dǎo)測(cè)量顯示:該材料呈p型半導(dǎo)體導(dǎo)電行為,電導(dǎo)大于同溫度下純相LaFeO3的電導(dǎo),且電導(dǎo)突變溫度有所降低。氣敏性能研究表明:Pb摻雜對(duì)其CO氣敏性能有了明顯改善。

    Abstract:

    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.

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宋鵬,秦宏偉,張玲,蔣民華,胡季帆.納米晶La_(0.7)Pb_(0.3)FeO_3的制備 及其對(duì)CO敏感特性的研究[J].稀有金屬材料與工程,2005,34(9).[Song Peng, Qin Hongwei, Zhang Ling, Jiang Minhua, Hu Jifan. Preparation and CO Sensitivity of Nanocrystalline La_(0.7)Pb_(0.3)FeO_3-Based Gas Sensor[J]. Rare Metal Materials and Engineering,2005,34(9).]
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