Abstract In this work, flame-spray-made Fe-doped SnO2 nanoparticles were comprehensively investigated for acetylene (C2H2) detection and the roles of Fe dopants on sensing mechanisms were explored. The sensing material properties were evaluated by X-ray diffraction, electron microscopy, N2 adsorption-desorption analysis, X-ray absorption/photoemission spectroscopy and UV–visible spectroscopy. The structural characterizations confirmed that the nanoparticles had a tetragonal nanocrystalline SnO2 phase and Fe3+ dopant species formed a solid solution with SnO2 lattice. The sensors were measured towards 0.15–3 vol% C2H2 in dry air at various working temperatures (200–350 °C). Gas-sensing data demonstrated that the optimal Fe doping level of 0.1 wt% led to a substantially enhanced response of 748.7 toward 3 vol% C2H2 with a decent response time of 2.5 s at the optimal working temperature of 300 °C. Furthermore, the optimal SnO2 sensor demonstrated high C2H2 selectivity against C2H5OH, NO2, H2, NH3, CO2, NO, H2S, CH4, C2H4O, C2H4 and N2O. Additional detailed analyses suggested that Fe3+ species played catalytic roles for enhancing C2H2 dissociation and oxidation. Thus, the Fe-doped SnO2 sensors were highly promising for selective and sensitive detections of acetylene in industrial applications.

中文翻译：

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替代性 Fe 掺杂剂对火焰法制备 SnO2 纳米粒子的催化乙炔传感过程的机制作用

摘要 在这项工作中，全面研究了火焰喷涂制备的 Fe 掺杂 SnO2 纳米粒子用于乙炔 (C2H2) 检测，并探讨了 Fe 掺杂剂在传感机制中的作用。通过X射线衍射、电子显微镜、N2吸附-解吸分析、X射线吸收/光发射光谱和紫外-可见光谱评估传感材料的性能。结构表征证实纳米颗粒具有四方纳米晶体 SnO2 相，Fe3+ 掺杂物质与 SnO2 晶格形成固溶体。在各种工作温度（200-350°C）下，在干燥空气中对 0.15-3 vol% C2H2 的传感器进行测量。气敏数据表明，0.1 wt% 的最佳 Fe 掺杂水平导致对 3 vol% C2H2 的响应显着增强，响应时间为 2，响应时间为 2。在 300°C 的最佳工作温度下 5 秒。此外，最佳的 SnO2 传感器表现出对 C2H5OH、NO2、H2、NH3、CO2、NO、H2S、CH4、C2H4O、C2H4 和 N2O 的高 C2H2 选择性。额外的详细分析表明，Fe3+ 物种在增强 C2H2 解离和氧化方面发挥了催化作用。因此，Fe 掺杂的 SnO2 传感器非常有希望用于工业应用中乙炔的选择性和灵敏检测。