Flower-like In(OH) was synthesized by a facile homogeneous precipitation method and subsequently calcined at 300 °C to prepare nanosheets assembled 3D flower-like mesoporous InO, which was then modified with Au nanoparticles via sol-immobilization method to produce 3D hierarchical mesoporous Au/InO for ethanol detection. The as-prepared Au/InO were carefully characterized by XRD, SEM, HRTEM and XPS techniques. The flower-like structure was assembled by many ultrathin coarse mesoporous InO nanosheets, and Au nanoparticles with an average size of 3.3 nm were evenly dispersed on InO nanosheets. The 3D flower-like mesoporous 1%Au/InO has a high specific surface area of about 130 m g and shows the best sensitivity to ethanol among the flower-like mesoporous Au/InO materials. It can sensitively detect ethanol gas at a relatively low temperature of 160 °C with a response of 115–50 ppm ethanol, increased by nearly 11 times compared to InO at 210 °C. The 3D flower-like mesoporous 1%Au/InO also has good selectivity to ethanol with response about 9.4, 26.1, 20.9 and 29.5 times higher than that to acetone, methanol, toluene and xylene, and it displays excellent linear relationship between the response and the ethanol concentration. The markedly improved sensitivity and selectivity of the 3D flower-like mesoporous 1%Au/InO results from both the electronic sensitization and chemical sensitization effects of Au nanoparticles. In short, the 3D flower-like mesoporous 1%Au/InO possesses excellent sensitivity, selectivity, repeatability, linear relationship and long-term stability at 160 °C. Therefore, the obtained 3D flower-like mesoporous 1%Au/InO has great potential for ethanol gas detection.

中文翻译：

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轻松组装 Au 纳米粒子修饰的分级介孔 In2O3 用于高灵敏度乙醇气体检测

采用简便的均相沉淀法合成了花状 In(OH)，随后在 300 °C 下煅烧制备了纳米片组装的 3D 花状介孔 InO，然后通过溶胶固定化方法用 Au 纳米粒子对其进行修饰，制备了 3D 分级介孔材料。 Au/InO 用于乙醇检测。通过 XRD、SEM、HRTEM 和 XPS 技术对所制备的 Au/In2O 进行了仔细表征。该花状结构由许多超薄粗介孔In2O纳米片组装而成，平均尺寸为3.3 nm的Au纳米粒子均匀分散在In2O纳米片上。3D花状介孔1%Au/InO具有约130 mg的高比表面积，在花状介孔Au/InO材料中表现出对乙醇最好的敏感性。它可以在 160 °C 的相对较低温度下灵敏地检测乙醇气体，乙醇响应为 115-50 ppm，与 210 °C 时的 InO 相比提高了近 11 倍。3D花状介孔1%Au/InO对乙醇也具有良好的选择性，其响应度比丙酮、甲醇、甲苯和二甲苯高出约9.4、26.1、20.9和29.5倍，并且响应度和响应度之间表现出良好的线性关系。乙醇浓度。3D花状介孔1%Au/InO显着提高的灵敏度和选择性是由于Au纳米粒子的电子敏化和化学敏化效应所致。总之，3D花状介孔1%Au/InO在160℃下具有优异的灵敏度、选择性、重复性、线性关系和长期稳定性。因此，所获得的3D花状介孔1%Au/InO在乙醇气体检测方面具有巨大的潜力。