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.
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.
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