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<p> A&#xa0;facile one-pot hydrothermal method was established&#xa0;to simultaneously prepare blue and yellow emissive carbon dots (BCDs and YCDs) in an immiscible system. This method eliminated the need for complex purification steps. The resulting BCDs and YCDs exhibited uniform sizes and excellent fluorescence properties. A ratiometric fluorescent probe based on B/YCDs was designed for the rapid and selective detection of Hg<sup>2+</sup> with a detection limit of 15&#xa0;nM. The probe was capable of reliable detection in real water samples with recoveries of 92.42 ~ 110.02%. To further enhance practicality, we incorporated fluorescent papers and hydrogels for visual Hg<sup>2+</sup>&#xa0;detection, making it ideal for on-site applications. Additionally, a smartphone-based sensing platform, integrating RGB value analysis, was also developed for accurate Hg<sup>2+</sup> detection. This work represents a significant advancement in the field by providing a user-friendly and cost-effective approach for sensitive on-site detection of hazardous mercury&#xa0;pollution.</p> Graphical Abstract <p></p>

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Ratiometric fluorescent detection of Hg2+ using dual-emissive carbon dots in an immiscible system

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Fei Shen,
  • Xiangzhi Meng,
  • Wenxi Zhang,
  • Jing Sun,
  • Juan Hou

摘要

A facile one-pot hydrothermal method was established to simultaneously prepare blue and yellow emissive carbon dots (BCDs and YCDs) in an immiscible system. This method eliminated the need for complex purification steps. The resulting BCDs and YCDs exhibited uniform sizes and excellent fluorescence properties. A ratiometric fluorescent probe based on B/YCDs was designed for the rapid and selective detection of Hg2+ with a detection limit of 15 nM. The probe was capable of reliable detection in real water samples with recoveries of 92.42 ~ 110.02%. To further enhance practicality, we incorporated fluorescent papers and hydrogels for visual Hg2+ detection, making it ideal for on-site applications. Additionally, a smartphone-based sensing platform, integrating RGB value analysis, was also developed for accurate Hg2+ detection. This work represents a significant advancement in the field by providing a user-friendly and cost-effective approach for sensitive on-site detection of hazardous mercury pollution.

Graphical Abstract