Conventional H 2 S sensors operating in high-temperature environments have disadvantages such as high-power consumption and inability to be used in flammable and explosive environments. To address these challenges, a novel room-temperature hydrogen sulfide sensor based on a graphene (G) /molybdenum disulfide (MoS 2 ) heterojunction is proposed for the first time. Using density functional theory (DFT) first-principles calculations, this study systematically compared the adsorption behavior of H 2 S on the heterojunction and on monolayer MoS 2 , analyzing adsorption energy, density of states, and charge transfer. The sensor was fabricated using a low-cost, simple, and controllable mechanical exfoliation method. This technique shows strong potential for compatibility with standard microelectronic processes, making it suitable for future large-scale production and industrial use. The sensor exhibits a 20% response at 1 ppm H 2 S, with excellent linearity ( R 2 = 0.9887) across the 1–15 ppm range. Under 10 ppm H 2 S exposure, response/recovery times are 219 s/247 s. The proposed G/MoS 2 heterojunction gas sensor effectively addresses the challenge of detecting H 2 S at ambient temperature, offering a practical and energy-efficient solution for real-world applications.
Jin et al. (Mon,) studied this question.