Abstract In this paper, In2O3 nanospheres and NiO nanoparticles decorated In2O3 nanospheres with enhanced methane (CH4) sensing performance were successfully synthesized via a facile solvothermal method and the subsequent calcination process. Diverse characterization technologies such as X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were employed to identify their compositions, morphologies and nanostructures. The methane sensing performances of the NiO/In2O3 nanocomposites were compared with the pure In2O3, and the results indicated that the decorating of NiO significant enhanced the sensing capability. The response value of the NiO/In2O3 nanocomposites toward 500 ppm CH4 was ∼13.057, which was nearly 10.3 times higher than that of pure In2O3 at 120 °C. In addition, the optimal operating temperature of In2O3 was reduced from 180 °C to 120 °C after decorated by NiO. Meanwhile, the NiO/In2O3 nanocomposites also displayed the excellent selectivity, good repeatability and stability. This research confirmed that the promising application for CH4 detection of the NiO/In2O3 nanocomposites.

中文翻译：

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NiO修饰的In2O3纳米球复合材料在低温下增强甲烷传感性能

摘要 在本文中，通过简便的溶剂热法和随后的煅烧过程，成功合成了 In2O3 纳米球和修饰 In2O3 纳米球的具有增强甲烷 (CH4) 传感性能的 NiO 纳米颗粒。采用多种表征技术，如 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM) 和透射电子显微镜 (TEM) 来鉴定它们的成分、形貌和纳米结构。将 NiO/In2O3 纳米复合材料的甲烷传感性能与纯 In2O3 进行比较，结果表明 NiO 的修饰显着增强了传感能力。NiO/In2O3 纳米复合材料对 500 ppm CH4 的响应值为~13.057，在 120°C 时比纯 In2O3 的响应值高近 10.3 倍。此外，经 NiO 修饰后，In2O3 的最佳工作温度从 180°C 降低到 120°C。同时，NiO/In2O3纳米复合材料还表现出优异的选择性、良好的重复性和稳定性。该研究证实了 NiO/In2O3 纳米复合材料在 CH4 检测方面的应用前景。