Pyrolyze metal-organic frameworks (MOFs) is a promising method to prepare metal oxides with large specific surface and multiple active sites. The obtained metal oxides can be utilized as gas sensors. Noble metal doping is an effective way to improve the gas sensitivity of materials. In this work, SnO₂ are prepared by pyrolyzation of metal organic frameworks and Ag-doped SnO₂ composites are fabricated by AgNO₃ reduction in a water bath at 4 °C. The gas-sensing experiment reveals that the optimum operating temperature of different mass fraction of Ag doped SnO₂ samples is 250 °C which is lower than pure SnO₂ (300 °C). The response of composites (7 wt% Ag–SnO₂) is 157 to 10 ppm ethanol, which is about 10 times higher than pure SnO₂ (14). The composites have good selectivity and stability. Such excellent performance is contributed to the increase of the gas adsorption capacity, catalytic active site and oxygen vacancy of the composites caused by the doping of Ag.

热解金属有机骨架（MOF）是制备具有大比表面积和多个活性位点的金属氧化物的一种很有前景的方法。所得金属氧化物可用作气体传感器。贵金属掺杂是提高材料气体敏感性的有效途径。在这项工作中，SnO ₂是通过金属有机骨架的热解制备的，Ag 掺杂的 SnO ₂复合材料是通过在 4 °C 的水浴中还原AgNO ₃来制备的。气敏实验表明，不同质量分数的Ag掺杂SnO ₂样品的最佳工作温度为250°C，低于纯SnO ₂ (300°C)。复合材料的响应（7 wt% Ag-SnO ₂) 是 157 到 10 ppm 的乙醇，比纯 SnO ₂ (14)高约 10 倍。该复合材料具有良好的选择性和稳定性。这种优异的性能有助于增加Ag掺杂引起的复合材料的气体吸附能力、催化活性位点和氧空位。