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中文摘要：
采用溶胶-凝胶法结合微波化学法制备了Ag-LaFeO3气敏材料。利用热分析（TG-DSC）、X射线衍射（XRD）以及傅里叶变换红外光谱法（FT-IR）对其进行了分析和表征。结果显示所制备的样品为正交钙钛矿结构,含有Ag和LaFeO3两种物相。气敏测试结果表明,当AgNO3与La（NO3）3的摩尔比为1：9时所制备的Ag-LaFeO3元件对1.0×10-6甲醛气体的灵敏度和选择性均优于其它摩尔比的元件,响应恢复时间均约为180s。
英文摘要：
Formaldehyde gas-sensing properties of Ag-LaFeO3 prepared by sol-gel method combined with microwave chemical method were studied in this paper.The specimen powders were characterized by thermo-gravimetry-differential scanning calorimetry（TG-DSC）,X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FT-IR）.The results show that the phase of Ag-LaFeO3 powders including Ag and LaFeO3 are perovskite.The sensor of Ag-LaFeO3 synthesized from the AgNO3 and La（NO3）3 precursors with the molar ratio of 1∶9 shows the best sensitivity for 1.0×10-6 formaldehyde than the others.In addition,the response and recovery time are both about 180s.
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