中文摘要：

银改性铁酸镧（Ag-LaFeO3）具有优良的甲醛敏感性能,但尚存在工作温度偏高、灵敏度不够理想等不足。在前期研究的基础上,采用碳纳米管（CNTs）对其进一步修饰,用溶胶-凝胶法（sol-gel）结合微波化学法制备了CNTs-Ag-LaFeO3粉末,研究了其结构和气敏性能,结果表明,CNTs-Ag-LaFeO3粉末均为单一钙钛矿结构,0.75%CNTs-Ag-LaFeO3在86℃下,对1.0×10-6甲醛气体的灵敏度为13,响应恢复时间分别为110和60s,而且在58℃下对1.0×10-6的甲醛气体也有明显的响应。

英文摘要：

The inorganic perovskite compound was a kind of promising gas sensitive material due to its stable structure,and its cationic can be easily replaced by other ions.Silver-modified lanthanum ferrite（Ag-LaFeO3） has excellent gas sensitive characterization,but the operating temperature was still on the high side and the sensitivity is not ideal.This work based on the previous study of our research team.The carbon nano tubes（CNTs） were used for further modification.CNTs-Ag-LaFeO3 powder was prepared by sol-gel method（sol-gel） combined with microwave chemical synthesis.The structure and gas-sensing properties were explored,the result shows： CNTs-Ag-LaFeO3 has an orthogonal perovskite structure.At 86℃,the sensitivity of 0.75%CNTs-Ag-LaFeO3 powder for 1.0×10-6 formaldehyde is 13.The response and recovery time are 110 and 60s,respectively.0.75%CNTs-Ag-LaFeO3 powder also has an obvious response for 1.0×10-6 formaldehyde at 58℃.