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<p>Three types of carbon dots were synthesized using the same precursor (folic acid and europium nitrate) via different preparation methods (doping and direct coordination). A comprehensive comparison and analysis of the morphology, surface groups, and optical properties of the prepared carbon dots (CD), europium-doped carbon dots (CD-Eu), and europium-functionalized carbon dots (CD@Eu) were conducted. Moreover, due to the higher quantum yield, excellent stability, and outstanding selectivity for UO<sub>2</sub><sup>2+</sup> exhibited by CD-Eu, we selected CD-Eu as the probe for subsequent applications. CD-Eu showed a sensitive response to UO<sub>2</sub><sup>2+</sup> within the concentration range 25 ~ 200&#xa0;nM, with a detection limit of 0.84&#xa0;nM (0.42&#xa0;μg·L<sup>−1</sup>). Additionally, CD-Eu demonstrated excellent accuracy and recovery in spiked detection of real water samples. Furthermore, we discovered that this probe could detect UO<sub>2</sub><sup>2+</sup> both <i>in</i> <i>vitro</i> and <i>in</i> <i>viv</i>o. This strategy provides a promising fluorescent sensor for the detection of UO<sub>2</sub><sup>2+</sup> in water and biological samples, holding significant implications for addressing UO<sub>2</sub><sup>2+</sup> contamination issues.</p> Graphical abstract <p></p>

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Engineering fluorescent carbon dot sensor with rare earth europium for the detection of uranium (VI) ion in vivo

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Xiayu Zhou,
  • Yue Wang,
  • Jiayi Song,
  • Lihao Xiong,
  • Xin Zhao,
  • Sihan Chen,
  • Weichao Zhao,
  • Le Li,
  • Deshuai Zhen

摘要

Three types of carbon dots were synthesized using the same precursor (folic acid and europium nitrate) via different preparation methods (doping and direct coordination). A comprehensive comparison and analysis of the morphology, surface groups, and optical properties of the prepared carbon dots (CD), europium-doped carbon dots (CD-Eu), and europium-functionalized carbon dots (CD@Eu) were conducted. Moreover, due to the higher quantum yield, excellent stability, and outstanding selectivity for UO22+ exhibited by CD-Eu, we selected CD-Eu as the probe for subsequent applications. CD-Eu showed a sensitive response to UO22+ within the concentration range 25 ~ 200 nM, with a detection limit of 0.84 nM (0.42 μg·L−1). Additionally, CD-Eu demonstrated excellent accuracy and recovery in spiked detection of real water samples. Furthermore, we discovered that this probe could detect UO22+ both in vitro and in vivo. This strategy provides a promising fluorescent sensor for the detection of UO22+ in water and biological samples, holding significant implications for addressing UO22+ contamination issues.

Graphical abstract