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<p>Two-dimensional (2D) materials are intensively studied as promising materials for gas sensors owing to their large surface area and low working temperature. In this work, we report the synthesis of a layered SnS<sub>2</sub> single crystal by a chemical vapor deposition (CVD) approach for NO<sub>2</sub> sensing. By tuning the growth temperature, high-quality crystals with a lateral size over 3 mm are obtained in 30 min. The 2D SnS<sub>2</sub> sensor with optimized thickness (~15 nm) shows a low detection limit (2 ppb), a fast recovery time (66 s/1 ppm), and a high response (~4702% @ 1 ppm NO<sub>2</sub>) at room temperature (RT) under UV illumination. An in-situ Kelvin probe force microscope is employed to reveal the high selectivity of SnS<sub>2</sub> through qualitative and semi-quantitative analysis of charge transfer behavior, including the directions and amount of charge transfer, upon exposure to different gases. In-situ Raman and first-principles density functional theory calculations further confirm the sensing mechanism toward NO<sub>2</sub>. Both experimental and theoretical results suggest that 2D SnS<sub>2</sub> holds promising potential as an RT NO₂ sensing material.</p><p></p>

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Two-dimensional SnS2 single crystal for sensitive NO2 detection at room temperature

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月11日

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  • Chenfei Guo,
  • Lin Liu,
  • Zhengyang Cai,
  • Yingyi Wang,
  • Kejie Guan,
  • Fuqin Sun,
  • Weifan Zhou,
  • Xiaoshuang Gou,
  • Xiaoqian He,
  • Xiaowei Wang,
  • Ting Zhang

摘要

Two-dimensional (2D) materials are intensively studied as promising materials for gas sensors owing to their large surface area and low working temperature. In this work, we report the synthesis of a layered SnS2 single crystal by a chemical vapor deposition (CVD) approach for NO2 sensing. By tuning the growth temperature, high-quality crystals with a lateral size over 3 mm are obtained in 30 min. The 2D SnS2 sensor with optimized thickness (~15 nm) shows a low detection limit (2 ppb), a fast recovery time (66 s/1 ppm), and a high response (~4702% @ 1 ppm NO2) at room temperature (RT) under UV illumination. An in-situ Kelvin probe force microscope is employed to reveal the high selectivity of SnS2 through qualitative and semi-quantitative analysis of charge transfer behavior, including the directions and amount of charge transfer, upon exposure to different gases. In-situ Raman and first-principles density functional theory calculations further confirm the sensing mechanism toward NO2. Both experimental and theoretical results suggest that 2D SnS2 holds promising potential as an RT NO₂ sensing material.