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<p>Developing high-performance sensors for the rapid and reliable detection of hydrogen in the air is crucial. In this study, a hydrogen sensor utilizing a single-layer graphene/SnO<sub>2</sub> composite was synthesized via the hydrothermal method. The investigation focused on assessing the impact of varying doping levels of single-layer graphene (SLG) on the hydrogen-sensing capabilities of the SnO<sub>2</sub> base material. The results indicated that optimal performance was achieved with an SLG doping of 4&#xa0;mg. The SnO<sub>2</sub>/SLG-4&#xa0;mg material exhibited its best response at a temperature of 250&#xa0;°C, with a response value of 1.98 for 10&#xa0;ppm of hydrogen, and a response/recovery time of 1.32/3.54&#xa0;s. The sensing mechanism of the single-layer graphene/SnO<sub>2</sub> composite sensor is attributed to the SLG doping, which facilitates the formation of an n-p heterojunction structure on the surface of the SnO<sub>2</sub> grains. This structure increases the electron concentration; SLG doping also contributes to grain refinement. Analysis from X-ray photoelectron spectroscopy (XPS) revealed that SLG doping enhances the concentration of oxygen vacancies, increasing the number of active sites on the material's surface, thereby optimizing its hydrogen-sensing capabilities. This method of doping single-layer graphene provides a new idea and method for the preparation of low detection limit gas sensors.</p>

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Sensitive hydrogen sensing using SnO2 enabled by single-layer graphene composites

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Lingyun Wang,
  • Yihan Shen,
  • Zijie Jiao,
  • Xiaotong Xu,
  • Jie Xiang,
  • Shuiming Huang,
  • Tao Lu,
  • Xueling Hou

摘要

Developing high-performance sensors for the rapid and reliable detection of hydrogen in the air is crucial. In this study, a hydrogen sensor utilizing a single-layer graphene/SnO2 composite was synthesized via the hydrothermal method. The investigation focused on assessing the impact of varying doping levels of single-layer graphene (SLG) on the hydrogen-sensing capabilities of the SnO2 base material. The results indicated that optimal performance was achieved with an SLG doping of 4 mg. The SnO2/SLG-4 mg material exhibited its best response at a temperature of 250 °C, with a response value of 1.98 for 10 ppm of hydrogen, and a response/recovery time of 1.32/3.54 s. The sensing mechanism of the single-layer graphene/SnO2 composite sensor is attributed to the SLG doping, which facilitates the formation of an n-p heterojunction structure on the surface of the SnO2 grains. This structure increases the electron concentration; SLG doping also contributes to grain refinement. Analysis from X-ray photoelectron spectroscopy (XPS) revealed that SLG doping enhances the concentration of oxygen vacancies, increasing the number of active sites on the material's surface, thereby optimizing its hydrogen-sensing capabilities. This method of doping single-layer graphene provides a new idea and method for the preparation of low detection limit gas sensors.