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首页> 外文期刊>Physica, B. Condensed Matter >Gas sensing with semiconducting perovskite oxide LaFeO3
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Gas sensing with semiconducting perovskite oxide LaFeO3

机译：半导体钙钛矿氧化物LaFeO3的气敏

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This paper reports results of gas-sensing studies with antiferromagnetic perovskite oxide LaFeO3 thick films, for a possible use of the films in semiconductor gas sensors for monitoring pollutant, toxic and flammable gases in atmospheric air. Conductance responses of the nanocrystalline LaFeO3 thick films with both Au and Pt electrodes were measured at exposure of the films to CO, CH4 and NO2 at different concentrations in air and also at different temperatures. Different temperatures can be used to make the films sensitive to different gases. This gives a possibility to use an array of films for a selective detection in the case of a gas mixture. The sensitivity of the films was found to be high and it was possible to detect, e.g., CO and CH4 concentrations down to a few tens of ppm, and NO and NO2 concentrations already in the sub-ppm region. An array of two sensing films, operating at 270degreesC and 420degreesC, respectively, was used to monitor different mixtures of CO and CH4. The results point to a possibility to use semiconductor gas sensors based on LaFeO3 thick films for monitoring, e.g., flammable gases in coal mines. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 8]
机译：本文报道了反铁磁钙钛矿氧化物LaFeO3厚膜的气体传感研究结果，该膜可能在半导体气体传感器中用于监测大气中的污染物，有毒和可燃气体。在空气和不同温度下，在暴露于CO，CH4和NO2的情况下，测量具有Au和Pt电极的纳米LaFeO3纳米厚膜的电导响应。可以使用不同的温度来使薄膜对不同的气体敏感。在混合气体的情况下，这可以将薄膜阵列用于选择性检测。发现膜的灵敏度高，并且可以检测例如低至几十ppm的CO和CH 4浓度，以及已经在低于ppm的区域的NO和NO 2浓度。两个分别在270°C和420°C下运行的传感膜的阵列用于监视CO和CH4的不同混合物。结果表明，有可能使用基于LaFeO3厚膜的半导体气体传感器来监测例如煤矿中的可燃气体。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：8]

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