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<p>SnO<sub>2</sub> mesoporous nanosheets with dominant the (001) crystal planes were synthesized via a mesoporous template-confined strategy. The cetyltrimethylammonium chloride used was both the mesoporous template and structure-directing agent, which enables the SnO<sub>2</sub> nanosheets to have a rich mesoporous structure and effectively promote the rapid diffusion of gaseous chlorine (Cl<sub>2</sub>). Meanwhile, the abundant Sn unsaturated coordination sites on the (001) planes significantly enhance Cl<sub>2</sub> adsorption. The SnO<sub>2</sub>-(001) sensor achieved highly sensitive detection of Cl<sub>2</sub> at room temperature. It exhibited a high response of 408 toward 5 ppm Cl<sub>2</sub>, low practical detection limit (10 ppb), excellent selectivity and long-term stability. This breakthrough not only overcomes the high-temperature working limitation of traditional SnO<sub>2</sub>-based Cl<sub>2</sub> sensors. In addition, the sensor was employed to monitor Cl<sub>2</sub> emissions during the use of chlorine-containing disinfectants. Test results indicated that the Cl<sub>2</sub> concentration surpassed the safety threshold within 7-14&#xa0;min of disinfectant application. It demonstrated its strong potential for practical applications. Furthermore, it lays the solid foundation for optimizing other metal oxide-based room temperature gas sensors.</p> Graphical Abstract <p></p>

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(001)-Exposed mesoporous SnO2 nanosheets for room temperature trace chlorine monitoring

  • 期刊论文

  • 发表日期：

    2026年2月6日

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  • Weiqi Meng,
  • Ming Zheng,
  • Xianfa Zhang,
  • Chuanyu Guo,
  • Yingming Xu,
  • Chaobo Huang,
  • Zongshuang Cao,
  • Xin Dong,
  • Lihua Huo,
  • Xiaoli Cheng

摘要

SnO2 mesoporous nanosheets with dominant the (001) crystal planes were synthesized via a mesoporous template-confined strategy. The cetyltrimethylammonium chloride used was both the mesoporous template and structure-directing agent, which enables the SnO2 nanosheets to have a rich mesoporous structure and effectively promote the rapid diffusion of gaseous chlorine (Cl2). Meanwhile, the abundant Sn unsaturated coordination sites on the (001) planes significantly enhance Cl2 adsorption. The SnO2-(001) sensor achieved highly sensitive detection of Cl2 at room temperature. It exhibited a high response of 408 toward 5 ppm Cl2, low practical detection limit (10 ppb), excellent selectivity and long-term stability. This breakthrough not only overcomes the high-temperature working limitation of traditional SnO2-based Cl2 sensors. In addition, the sensor was employed to monitor Cl2 emissions during the use of chlorine-containing disinfectants. Test results indicated that the Cl2 concentration surpassed the safety threshold within 7-14 min of disinfectant application. It demonstrated its strong potential for practical applications. Furthermore, it lays the solid foundation for optimizing other metal oxide-based room temperature gas sensors.

Graphical Abstract