Abstract In this work, CdO-Ag-ZnO nanocomposites with hierarchically porous structure and large surface area were successfully fabricated by solution combustion synthesis (SCS) method. Crystalline structure, morphology, surface chemical states and specific surface area were investigated by XRD, SEM, TEM, XPS and BET techniques, respectively. Sensors fabricated from CdO-Ag-ZnO nanocomposites were made based on indirect heating method, which showed superior sensing properties in detecting different concentration of volatile organic compounds (VOCs). In contrast with singular ZnO, gas-sensing experiment results reveal that the addition of CdO and Ag effectively decreases optimum working temperature, increases gas response value and shortens response and recovery time. What’s more, other gas-sensing properties including repeatability, sensitivity and long-term stability are also discussed in this research. Particularly, gas sensor based on 10 mol% CdO-Ag-ZnO shows modest gas-sensing performance to VOCs at the operating temperature of 200 °C, and its gas response values are 198.63, 156.07, 53.04, 64.23, 183.65 towards 100 ppm formaldehyde, ethanol, acetone, methanol and isopropanol, respectively, indicating it a promising candidate in detecting VOCs. Superior sensing property is mainly ascribed to large specific surface area, special porous surface morphology, unique combination of nanocomposites and good catalytic ability of metallic Ag.

中文翻译：

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具有分层多孔结构的 CdO-Ag-ZnO 纳米复合材料具有有效的 VOC 气敏特性

摘要 本工作采用溶液燃烧合成（SCS）方法成功制备了具有分级多孔结构和大表面积的CdO-Ag-ZnO纳米复合材料。通过XRD、SEM、TEM、XPS和BET技术分别研究了晶体结构、形貌、表面化学状态和比表面积。由 CdO-Ag-ZnO 纳米复合材料制成的传感器是基于间接加热方法制成的，在检测不同浓度的挥发性有机化合物 (VOC) 方面表现出优异的传感性能。与单一的ZnO相比，气敏实验结果表明，CdO和Ag的加入有效降低了最佳工作温度，提高了气体响应值，缩短了响应和恢复时间。更重要的是，其他气体传感特性包括可重复性，本研究还讨论了灵敏度和长期稳定性。特别是，基于 10 mol% CdO-Ag-ZnO 的气体传感器在 200 °C 的工作温度下对 VOC 表现出适度的气敏性能，其气体响应值为 198.63、156.07、53.04、64.23、183.65，对 100 ppm 甲醛、乙醇、丙酮、甲醇和异丙醇，表明它是检测 VOC 的有希望的候选者。优越的传感性能主要归功于大的比表面积、特殊的多孔表面形态、纳米复合材料的独特组合以及金属银良好的催化能力。04、64.23、183.65 分别为 100 ppm 甲醛、乙醇、丙酮、甲醇和异丙醇，表明它是检测 VOC 的有希望的候选者。优越的传感性能主要归功于大的比表面积、特殊的多孔表面形态、纳米复合材料的独特组合以及金属银良好的催化能力。04、64.23、183.65 分别为 100 ppm 甲醛、乙醇、丙酮、甲醇和异丙醇，表明它是检测 VOC 的有希望的候选者。优越的传感性能主要归功于大的比表面积、特殊的多孔表面形态、纳米复合材料的独特组合以及金属银良好的催化能力。