【作者】 林毓韬； 徐涛； 朱忠其； 柳清菊；

【Author】 LIN Yutao,XU Tao,ZHU Zhongqi,LIU Qingju (Yunnan Key laboratory of nanomaterials & technology,Yunnan University,Kunming 650091)

【机构】 云南省高校纳米材料与技术重点实验室云南大学；

【摘要】 为了改善LaFeO₃材料的气敏性能,采用溶胶-凝胶法结合微波化学法制备了Ag-LaFeO₃气敏粉体材料,并将其制成烧结型旁热式气敏元件。利用热分析（TG-DSC）以及X射线衍射（XRD）对粉体进行了分析和表征,结果显示:粉体为正交钙钛矿结构,有Ag和LaFeO₃两种物相。气敏测试结果表明:组分含量比x=mol（AgNO₃）:mol（La（NO₃）₃）=1:9的Ag-LaFe₃元件对1ppm甲醛气体的灵敏度和选择性均优于其它组分含量比的元件,另外,其响应恢复时间均约为180s。更多还原

【Abstract】 Sintering heater-type gas sensors of Ag-LaFeO₃ nanopowders were fabricated by sol-gel couple with microwave chemical synthesis process to enhance the sensing properties of LaFeO₃.The crystal structures were characterized by thermal analysis（TG-DSC） and X-ray diffraction（XRD）.The results showed the structure of Ag-LaFeO₃ powders which included Ag and LaFeO₃ phases were perovskite.The Ag-LaFeO₃（x=1:9） sensors showed better sensitivity and selectivity for 1ppm formaldehyde than other Ag-LaFeO₃ sensors.In addition,the response and recovery time were both about 180s.更多还原