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<p>Perfluorooctanesulfonic acid (PFOS), a persistent environmental pollutant, poses significant risks to ecosystems and human health, creating an urgent need for rapid and reliable on-site detection. We present a dual-mode sensing platform integrating visual fluorescence readout with quantitative photoelectrochemical (PEC) analysis, constructed by assembling metal-coordinated molecular nanocages (MN) onto a TiO<sub>2</sub> photoelectrode. The MN enables rapid, instrument-free visual identification of PFOS through fluorescence changes, providing straightforward qualitative screening. Meanwhile, the TiO₂/MN interface delivers a sensitive and linear PEC response, enabling highly accurate PFOS quantification with a low limit of detection (~0.16 nM) across complex matrices. The complementary nature of the two modes offers internal signal cross-validation, markedly enhancing detection reliability. Furthermore, the reversible PFOS–MN interaction allows simple regeneration of the sensing interface, supporting sustainable and repeated operation. This dual-mode strategy provides a practical, robust, and field-friendly solution for PFOS monitoring in environmental waters.</p> Graphical abstract <p></p>

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From vision to precision: molecular nanocage-enabled photoelectrochemical-fluorescent dual-mode PFOS sensing platform

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Ruizhi Luo,
  • Jie Cui,
  • Jianxuan Jiang,
  • Xinyue Hu,
  • Dongdong Yang,
  • Jinhui Feng,
  • Li Xu,
  • Qingzhi Han

摘要

Perfluorooctanesulfonic acid (PFOS), a persistent environmental pollutant, poses significant risks to ecosystems and human health, creating an urgent need for rapid and reliable on-site detection. We present a dual-mode sensing platform integrating visual fluorescence readout with quantitative photoelectrochemical (PEC) analysis, constructed by assembling metal-coordinated molecular nanocages (MN) onto a TiO2 photoelectrode. The MN enables rapid, instrument-free visual identification of PFOS through fluorescence changes, providing straightforward qualitative screening. Meanwhile, the TiO₂/MN interface delivers a sensitive and linear PEC response, enabling highly accurate PFOS quantification with a low limit of detection (~0.16 nM) across complex matrices. The complementary nature of the two modes offers internal signal cross-validation, markedly enhancing detection reliability. Furthermore, the reversible PFOS–MN interaction allows simple regeneration of the sensing interface, supporting sustainable and repeated operation. This dual-mode strategy provides a practical, robust, and field-friendly solution for PFOS monitoring in environmental waters.

Graphical abstract