Sensing mechanism of Ag/α-MoO3 nanobelts for H2S gas sensor

• 作者: Shi-Kai Shen Xin-Lei Cui Chuan-Yu Guo Xin Dong Xian-Fa Zhang Xiao-Li Cheng Li-Hua Huo Ying-Ming Xu
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ADVANCED NANOMATERIALS FOR GAS AND HUMIDITY SENSORS
• 页码范围: 1545-1553
• 页数: 9页
• 语种: 英文

摘要

Sensing mechanism is still a big problem in the field of gas sensor.In-depth study of the sensing mecha-nism can provide better ideas for the design of sensing materials,and it is also more conducive to the improve-ment 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 ℃.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 spec-troscopy (FTIR).