Abstract
LaFe1-xMnxO3 (x = 0, 0.3, 0.4, 0.5 and 0.6) powders were prepared by sol-gel method in order to investigate systematically the effect of Mn doping on the structure and gas-sensing properties of LaFeO3. It is apparent that all samples are still perovskite structure from the X-ray diffraction (XRD) pattern, nevertheless a few Fe sites are replaced by Mn with the increase of Mn doping amount. The diffraction peak shift may be due to the presence of Mn3+/Mn4+ ions. When detecting target reducing gas, LaFe1-xMnxO3 sensors exhibited N-type semiconductor properties, which is quite different from the P-type semiconductor properties of typical LaFeO3 sensor. It seems highly probable that Fe3+ ions were substituted to form electronic compensation. At the same time, the LaFe1-xMnxO3 sensors has better stability and faster recovery time than LaFeO3 sensor, which is significant on its detection in actual plants and atmosphere; when x = 0.5, its recovery time is 6 times faster than LaFeO3 sensor.
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