Sensing mechanism is still a big problem in the field of gas sensor. In-depth study of the sensing mechanism can provide better ideas for the design of sensing materials, and it is also more conducive to the improvement in gas-sensing performance. In this work, Ag/α-MoO3 material was obtained by loading Ag in α-MoO3 nanobelts prepared by hydrothermal method. The material was characterized by field electron scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Comparing the gas sensing properties of α-MoO3 and Ag/α-MoO3, it is found that Ag effectively improves the selectivity of the material to H2S at 133 °C. The response of the 5 wt% Ag/α-MoO3 sensor to 100 × 10−6 hydrogen sulfide (H2S) is 225 and the detection limit is 100 × 10−9. The sensing mechanism was verified by gas chromatography and mass spectrometer (GC–MS), XPS and Fourier transform infrared spectroscopy (FTIR).

中文翻译：

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H2S气体传感器Ag/α-MoO3纳米带的传感机制

传感机制仍然是气体传感器领域的一大难题。对传感机理的深入研究可以为传感材料的设计提供更好的思路，也更有利于气体传感性能的提高。在这项工作中，通过在水热法制备的 α-MoO3 纳米带中负载 Ag 获得 Ag/α-MoO3 材料。通过场电子扫描电子显微镜 (SEM)、高分辨率透射电子显微镜 (HRTEM)、X 射线衍射 (XRD) 和 X 射线光电子能谱 (XPS) 对该材料进行了表征。比较α-MoO3 和Ag/α-MoO3 的气敏特性，发现Ag 有效地提高了材料在133 °C 时对H2S 的选择性。5 wt% Ag/α-MoO3 传感器对 100 × 10-6 硫化氢 (H2S) 的响应为 225，检测限为 100 × 10-9。