Abstract Perovskite-based metal oxides are one of the most prospective materials for detection of toxic, harmful and explosive gases, but the low electron mobility and ionic conductivity poses challenges in fast and accurate methanol detection. Thus, in this paper, the Ag doped double perovskite LaFe1-xSnxO3 (Ag-LFSO) nanocomposite was prepared via a sol-gel assisted microwave chemical synthesis, which played the dual roles of fast response and good selectivity to methanol detection. The response of Ag-LFSO sensor to 5 ppm methanol is 51.94 at 99 °C, which is approximately 6 times higher than that of the pure LaFeO3 sensor. Moreover, the significant enhancement of response and selectivity to methanol gas can be explained by the compensate for the position of Sn4+ in place of Fe3+ induced change in the carrier concentration and oxygen adsorption for LaFeO3. In addition, Ag-doping can catalyze surface reactions and introduce electron defects at the surface of materials, thereby effectively improving the electrical conductivity and oxygen adsorption characteristics of LFSO. All the results indicated that the double perovskite Ag-LFSO sensor is an ideal choice for detecting toxic and harmful gases in practical applications.

中文翻译：

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Ag修饰的双钙钛矿LaFe1-xSnxO3纳米复合材料可快速准确地检测甲醇

摘要 钙钛矿基金属氧化物是检测有毒、有害和爆炸性气体最有前景的材料之一，但低电子迁移率和离子电导率对甲醇的快速准确检测提出了挑战。因此，在本文中，通过溶胶-凝胶辅助微波化学合成制备了Ag掺杂的双钙钛矿LaFe1-xSnxO3（Ag-LFSO）纳米复合材料，其对甲醇检测具有快速响应和良好选择性的双重作用。Ag-LFSO 传感器对 5 ppm 甲醇的响应在 99 °C 时为 51.94，大约是纯 LaFeO3 传感器的 6 倍。而且，对甲醇气体的响应和选择性的显着增强可以通过补偿 Sn4+ 的位置而不是 Fe3+ 引起载流子浓度和氧吸附的 LaFeO3 变化来解释。此外，Ag掺杂可催化表面反应并在材料表面引入电子缺陷，从而有效提高LFSO的导电性和氧吸附特性。所有结果表明，双钙钛矿Ag-LFSO传感器是实际应用中检测有毒有害气体的理想选择。