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<p> An&#xa0;upconversion luminescence (UCL) nanoprobe is reported&#xa0;for the rapid detection of hypochlorite ions (ClO<sup>−</sup>) in complex environments. The probe is fabricated by sensitizing rhodamine B (RhB) on the surface of core@shell upconversion nanoparticles (C/S UCNPs) with the bridging of polyethylene glycol (PEG) molecules. Under 980 nm excitation, the UCL of C/S UCNPs is quenched by RhB through fluorescence resonance energy transfer (FRET), which can be restored by the oxidative cleavage of RhB induced by ClO<sup>−</sup>. It is observed that the green emission intensity of RhB-modified C/S UCNPs increases linearly with the concentration of ClO<sup>−</sup>, enabling quantitative detection of ClO<sup>−</sup>. Moreover, the excitation of C/S UCNPs requires only a low power density (0.09 W/cm<sup>2</sup>), which minimizes the photodegradation of RhB and stabilizes the FRET process. Under optimized conditions, the detection limit for ClO<sup>−</sup> ions in tap water was 5 µg mL⁻<sup>1</sup>.</p> Graphical abstract <p></p>

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Construction of a near-infrared excited RhB@UCNPs fluorescent probe for hypochlorite detection

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Keyu Guo,
  • Tong Liu,
  • Shun Li,
  • Daobin Zhu,
  • Yuanyuan Fan,
  • Rangrang Fan,
  • Changchun Ding,
  • Wei Jin,
  • Junshan Hu

摘要

An upconversion luminescence (UCL) nanoprobe is reported for the rapid detection of hypochlorite ions (ClO−) in complex environments. The probe is fabricated by sensitizing rhodamine B (RhB) on the surface of core@shell upconversion nanoparticles (C/S UCNPs) with the bridging of polyethylene glycol (PEG) molecules. Under 980 nm excitation, the UCL of C/S UCNPs is quenched by RhB through fluorescence resonance energy transfer (FRET), which can be restored by the oxidative cleavage of RhB induced by ClO−. It is observed that the green emission intensity of RhB-modified C/S UCNPs increases linearly with the concentration of ClO−, enabling quantitative detection of ClO−. Moreover, the excitation of C/S UCNPs requires only a low power density (0.09 W/cm2), which minimizes the photodegradation of RhB and stabilizes the FRET process. Under optimized conditions, the detection limit for ClO− ions in tap water was 5 µg mL⁻1.

Graphical abstract