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<p>Gas sensors activated by light and utilizing semiconducting metal oxides (SMOs) are highly promising for next-generation gas detection technologies, owing to advantages such as room-temperature operation, intrinsic safety, and simplified device architecture. Given that noble-metal nanoparticles and eco-friendly organic self-assembled peptide microtubes (SPMTs) can significantly enhance gas-sensing performance, we created a gas sensor activated by visible light, utilizing SPMTs/SnO<sub>2</sub>/Au heterostructures as sensing materials. A systematic investigation was carried out to explore the effects of Au NPs content and light intensity on sensor sensitivity and response. Under visible-light activation, the gas sensor demonstrated outstanding room-temperature sensing performance, achieving a high response value and a low detection limit. The exceptional sensing performance is largely due to the significantly enhanced visible-light absorption and the synergistic interaction among the constituent materials. Under exposure to 4.7 mW/cm<sup>2</sup> visible light irradiation, the sensor exhibited a maximum response of 692.15 to 20&#xa0;ppm NO<sub>2</sub>. Especially, the response of the sensor to 100&#xa0;ppb NO<sub>2</sub> attained a value of 5.28, demonstrating its excellent capability to detect low concentrations of NO<sub>2</sub>.</p> Graphical Abstract <p></p>

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A visible-light activated NO2 sensor for ppb-level detection based on self-assembled peptide microtubes/SnO2/Au hybrids at room temperature

  • 期刊论文

  • 发表日期：

    2025年5月25日

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  • Ranran Zhang,
  • Juan Zhang,
  • Xiaoneng Xie,
  • Weijie Qiu,
  • Haisheng Li,
  • Yao Zan,
  • Jun Wang,
  • Yu Chen,
  • Yang Li,
  • Xiaojie Xiu,
  • Wei Wu

摘要

Gas sensors activated by light and utilizing semiconducting metal oxides (SMOs) are highly promising for next-generation gas detection technologies, owing to advantages such as room-temperature operation, intrinsic safety, and simplified device architecture. Given that noble-metal nanoparticles and eco-friendly organic self-assembled peptide microtubes (SPMTs) can significantly enhance gas-sensing performance, we created a gas sensor activated by visible light, utilizing SPMTs/SnO2/Au heterostructures as sensing materials. A systematic investigation was carried out to explore the effects of Au NPs content and light intensity on sensor sensitivity and response. Under visible-light activation, the gas sensor demonstrated outstanding room-temperature sensing performance, achieving a high response value and a low detection limit. The exceptional sensing performance is largely due to the significantly enhanced visible-light absorption and the synergistic interaction among the constituent materials. Under exposure to 4.7 mW/cm2 visible light irradiation, the sensor exhibited a maximum response of 692.15 to 20 ppm NO2. Especially, the response of the sensor to 100 ppb NO2 attained a value of 5.28, demonstrating its excellent capability to detect low concentrations of NO2.

Graphical Abstract