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<p>Fluorine-doped carbon dots (F-CDs) are prepared through a one-pot hydrothermal method starting from ciprofloxacin, exhibiting a bright blue emission at 453&#xa0;nm under the optical wavelength of 358&#xa0;nm. The sensitive sensor for detecting Cu<sup>2+</sup> is established based on the fluorescence quenching of F-CDs, which is attributed to the static quenching caused by the formation of non-luminescent complexes between them. The limit of detection (LOD) is&#xa0;46.2&#xa0;nM. Meanwhile, a portable fluorescence sensor based on a lateral flow test strip (LFTS) has been developed for practical applications, which allows real-time monitoring of Cu<sup>2+</sup> with a satisfactory limit of detection (LOD) of 69.7&#xa0;nM in a good linear range of 0.0697–50&#xa0;μM. In addition, the identification of latent fingerprints (LFPs) based on F-CDs has been developed with the assistance of MATLAB, realizing high-performance fingerprint visualization and recognition. The results serve to underscore that the synthesized F-CDs not only provide a new tool for Cu<sup>2+</sup> detection in real samples, but also show great potential for LFPs visualization and information identification.</p> Graphical abstract <p></p>

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Two birds with one stone: one-step preparation of fluorine-doped CDs with sensitive sensing of copper and visualization of latent fingerprints

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Chao Chen,
  • Yihao Zhang,
  • Sineng Gao,
  • Linfan Wang,
  • Ting Zhang,
  • Tingting Li,
  • Xiaoqing Qian,
  • Da Chen

摘要

Fluorine-doped carbon dots (F-CDs) are prepared through a one-pot hydrothermal method starting from ciprofloxacin, exhibiting a bright blue emission at 453 nm under the optical wavelength of 358 nm. The sensitive sensor for detecting Cu2+ is established based on the fluorescence quenching of F-CDs, which is attributed to the static quenching caused by the formation of non-luminescent complexes between them. The limit of detection (LOD) is 46.2 nM. Meanwhile, a portable fluorescence sensor based on a lateral flow test strip (LFTS) has been developed for practical applications, which allows real-time monitoring of Cu2+ with a satisfactory limit of detection (LOD) of 69.7 nM in a good linear range of 0.0697–50 μM. In addition, the identification of latent fingerprints (LFPs) based on F-CDs has been developed with the assistance of MATLAB, realizing high-performance fingerprint visualization and recognition. The results serve to underscore that the synthesized F-CDs not only provide a new tool for Cu2+ detection in real samples, but also show great potential for LFPs visualization and information identification.

Graphical abstract