Ratiometric fluorescence nanoprobe based on nitrogen-doped carbon dots for Cu2+ and Fe3+ detection

文献类型： 外文期刊

第一作者： Yang, Chunlei

作者： Yang, Chunlei;Xu, Guiju;Hou, Chenghao;Zhang, Hongwei

作者机构：

关键词： Quantum dots; Carbon dots; Heavy metal ions; Ratiometric fluorescence; Cu2+ and Fe3+ detection

期刊名称：SCIENTIFIC REPORTS （ 影响因子：3.9； 五年影响因子：4.3 ）

ISSN： 2045-2322

年卷期： 2025 年 15 卷 1 期

页码：

收录情况： SCI

摘要： Heavy metal ions pollution in environmental waters has an increasing impact on human health. As two common metal ions, copper ions (Cu2+) and ferric ions (Fe3+) widely exist in nature and play a vital role in life process. Therefore, it is significant to design sensitive and simple detection approaches for Cu2+ and Fe3+. In our work, the ratiometric fluorescence analysis method (denoted as N-CDs/OPD) was established for Cu2+ and Fe3+ detection. The N-CDs exhibited a Cu2+ and Fe3+ fluorescence quenching response properties. The o-phenylenediamine (OPD) may be oxidized to 2,3-diaminophenazine (DAP) by Cu2+ and Fe3+. With addition of Cu2+ or Fe3+, the fluorescence of N-CDs (436 nm) was quenched and a new peak at 556 nm (DAP) appeared, which realized fluorescent ratiometric detection of Cu2+ and Fe3+. The Cu2+ concentration shows a good linear correlation versus fluorescence ratio (F-436/F-556) in the range of 10 to 30 mu M (R-2 = 0.9981) with detection limit (LOD) of 0.86 mu M. In addition, a good linear relationship between fluorescence ratio (F-436/F-556) and Fe3+ concentration in the range of 20 to 80 mu M (R-2 = 0.9880) with LOD of 7.12 mu M. This nanoprobe realizes the detection of authentic samples successfully, which is expected to serve as a testing kit for analysis in water samples.

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