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

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Abstract

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).

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 21771060 and 61271126), the International Science and Technology Cooperation Program of China (No. 2016YFE0115100), Heilongjiang Educational Department (No. RCYJTD201903) and Heilongjiang Touyan Innovation Team Program.

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Authors and Affiliations

  1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People’s Republic of China, Heilongjiang University, Harbin, 150080, China

    Chuan-Yu Guo, Xian-Fa Zhang, Xiao-Li Cheng, Li-Hua Huo & Ying-Ming Xu

  2. School of Electrical Engineering, Suihua University, Suihua, 152000, China

    Shi-Kai Shen & Xin-Lei Cui

  3. Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Engineering Technology Research Center for High-Performance Organic and Polymer Photoelectric Functional Films, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China

    Xin Dong

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  1. Shi-Kai Shen
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Correspondence to Ying-Ming Xu.

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Shen, SK., Cui, XL., Guo, CY. et al. Sensing mechanism of Ag/α-MoO3 nanobelts for H2S gas sensor. Rare Met. 40, 1545–1553 (2021). https://doi.org/10.1007/s12598-020-01647-3

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  • DOI: https://doi.org/10.1007/s12598-020-01647-3

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