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Volume 18
Issue 12
10.3390/ma18122687
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Communication

Dual Effects of Ag Doping and S Vacancies on H2 Detection Using SnS2-Based Photo-Induced Gas Sensor at Room Temperature

by
Shaoling Wang
1,2,
Xianju Shi
1,2,*,
Na Fang
1,2,
Haoran Ma
3 and
Jichao Wang
3,*
1
School of Energy and Chemical Engineering, Puyang Vocational and Technical College, Puyang 457000, China
2
Puyang Institute of Technology, Henan University, Puyang 457000, China
3
College of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China
*
Authors to whom correspondence should be addressed.
Materials 2025, 18(12), 2687; https://doi.org/10.3390/ma18122687
Submission received: 25 April 2025 / Revised: 22 May 2025 / Accepted: 4 June 2025 / Published: 6 June 2025
(This article belongs to the Section Catalytic Materials)
Versions Notes

Abstract

Hydrogen (H2) monitoring demonstrates significant practical importance for safety assurance in industrial production and daily life, driving the demand for gas-sensing devices with enhanced performance and reduced power consumption. This study developed a room-temperature (RT) hydrogen-sensing platform utilizing two-dimensional (2D) Ag-doped SnS2 nanomaterials activated by light illumination. The Ag-SnS2 nanosheets, synthesized through hydrothermal methods, exhibited exceptional H2 detection capabilities under blue LED light activation. The synergistic interaction between silver dopants and photo-activation enabled remarkable gas sensitivity across a broad concentration range (5.0–2500 ppm), achieving rapid response/recovery times (4 s/18 s) at 2500 ppm under RT. Material characterization revealed that Ag doping induced S vacancies, enhancing oxygen adsorption, while simultaneously facilitating photo-induced hole transfer for surface hydrogen activation. The optimized sensor maintained good response stability after five-week ambient storage, demonstrating excellent operational durability. Experimental results further demonstrated that Ag dopants enhanced hydrogen adsorption–activation, while S vacancies improved the surface oxygen affinity. This work provides fundamental insights into defect engineering strategies for the development of optically modulated gas sensors, proposing a viable pathway for the construction of energy-efficient environmental monitoring systems.
Keywords: SnS2; gas sensor; Ag doping; light-activated; H2 detection SnS2; gas sensor; Ag doping; light-activated; H2 detection

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MDPI and ACS Style

Wang, S.; Shi, X.; Fang, N.; Ma, H.; Wang, J. Dual Effects of Ag Doping and S Vacancies on H2 Detection Using SnS2-Based Photo-Induced Gas Sensor at Room Temperature. Materials 2025, 18, 2687. https://doi.org/10.3390/ma18122687

AMA Style

Wang S, Shi X, Fang N, Ma H, Wang J. Dual Effects of Ag Doping and S Vacancies on H2 Detection Using SnS2-Based Photo-Induced Gas Sensor at Room Temperature. Materials. 2025; 18(12):2687. https://doi.org/10.3390/ma18122687

Chicago/Turabian Style

Wang, Shaoling, Xianju Shi, Na Fang, Haoran Ma, and Jichao Wang. 2025. "Dual Effects of Ag Doping and S Vacancies on H2 Detection Using SnS2-Based Photo-Induced Gas Sensor at Room Temperature" Materials 18, no. 12: 2687. https://doi.org/10.3390/ma18122687

APA Style

Wang, S., Shi, X., Fang, N., Ma, H., & Wang, J. (2025). Dual Effects of Ag Doping and S Vacancies on H2 Detection Using SnS2-Based Photo-Induced Gas Sensor at Room Temperature. Materials, 18(12), 2687. https://doi.org/10.3390/ma18122687

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