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<p>A dual-mode sensor, Cu NCs/Eu<sup>3+</sup>@UiO-66-(COOH)<sub>2</sub>, was constructed by co-functionalizing UiO-66-(COOH)<sub>2</sub> with copper nanoclusters and Eu<sup>3+</sup> ions. Upon exposure to H<sub>2</sub>O<sub>2</sub>, the fluorescence of Cu NCs at 464&#xa0;nm enhanced while Eu<sup>3+</sup> emission at 616&#xa0;nm was quenched, enabling ratiometric fluorescence detection with a limit of detection (LOD) of 0.035 µM. Leveraging the peroxidase-like activity of Cu NCs, the probe material catalyzes the oxidation of a chromogenic substrate 3,3’,5,5’-tetramethylbenzidine (TMB) by H<sub>2</sub>O<sub>2</sub> to produce a visible color change, enabling a sensitive colorimetric analysis of H<sub>2</sub>O<sub>2</sub> with a LOD of 0.021 µM and its rapid and visual detection with the help of smartphone. The system was applied to detect H<sub>2</sub>O<sub>2</sub> in real samples with satisfactory recoveries.</p> Graphical abstract <p></p>

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A colorimetric–fluorescent dual-mode sensing platform based on Cu NCs/Eu3+@UiO-66-(COOH)2 for the visual and intelligent detection of hydrogen peroxide

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Yaxuan Hu,
  • Hao Guo,
  • Jiawei Kou,
  • Liping Peng,
  • Yingfei Hui,
  • Yu Yan,
  • Yang Yang,
  • Wu Yang

摘要

A dual-mode sensor, Cu NCs/Eu3+@UiO-66-(COOH)2, was constructed by co-functionalizing UiO-66-(COOH)2 with copper nanoclusters and Eu3+ ions. Upon exposure to H2O2, the fluorescence of Cu NCs at 464 nm enhanced while Eu3+ emission at 616 nm was quenched, enabling ratiometric fluorescence detection with a limit of detection (LOD) of 0.035 µM. Leveraging the peroxidase-like activity of Cu NCs, the probe material catalyzes the oxidation of a chromogenic substrate 3,3’,5,5’-tetramethylbenzidine (TMB) by H2O2 to produce a visible color change, enabling a sensitive colorimetric analysis of H2O2 with a LOD of 0.021 µM and its rapid and visual detection with the help of smartphone. The system was applied to detect H2O2 in real samples with satisfactory recoveries.

Graphical abstract