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<p>In this study, nitrogen-doped carbon dots (N-CDs) were successfully synthesized through a facile one-step hydrothermal approach using honeysuckle and ethylenediamine (EDA) as carbon and nitrogen sources, respectively. The obtained N-CDs displayed intense blue fluorescence emission at 420&#xa0;nm upon excitation at 350&#xa0;nm, along with an exceptional fluorescence quantum yield of 60.53%. Systematic characterization experiments employing transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) revealed the morphological features, surface functional groups, and elemental composition of the N-CDs. Remarkably, in HCl medium, chloride ion-catalyzed bromate oxidation led to pronounced fluorescence quenching of the N-CDs. A highly linear correlation (<i>R</i>² = 0.9965) was found between bromate concentration (64–1024 ng·mL<sup>− 1</sup>) and fluorescence quenching efficiency, as quantified by the equation log(<i>I</i>₀/<i>I</i>) = 3.86685<i>C</i> + 0.00557, with an impressive detection limit of 14 ng·mL<sup>− 1</sup> (<i>S</i>/<i>N</i> = 3). The practical application of this sensing platform to bromate determination in flour-based food products and tap water samples yielded satisfactory recoveries, ranging from 87.4 to 104.4%, with relative standard deviations below 3.5%. These findings highlight the great potential of the as-synthesized N-CDs as a reliable fluorescent nanoprobe for sensitive and selective bromate detection in complex food and environmental samples.</p>

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High-quantum Yield Carbon Dots as Selective Fluorescence Turn-off Probe for Bromate Detection in Food Samples Via Catalytic Oxidation Mechanism

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Guoqiang Xiang,
  • Chengwen Wang,
  • Yaming Sun,
  • Lijun He,
  • Xiuming Jiang,
  • Renyong Zhao,
  • Peng Li

摘要

In this study, nitrogen-doped carbon dots (N-CDs) were successfully synthesized through a facile one-step hydrothermal approach using honeysuckle and ethylenediamine (EDA) as carbon and nitrogen sources, respectively. The obtained N-CDs displayed intense blue fluorescence emission at 420 nm upon excitation at 350 nm, along with an exceptional fluorescence quantum yield of 60.53%. Systematic characterization experiments employing transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) revealed the morphological features, surface functional groups, and elemental composition of the N-CDs. Remarkably, in HCl medium, chloride ion-catalyzed bromate oxidation led to pronounced fluorescence quenching of the N-CDs. A highly linear correlation (R² = 0.9965) was found between bromate concentration (64–1024 ng·mL− 1) and fluorescence quenching efficiency, as quantified by the equation log(I₀/I) = 3.86685C + 0.00557, with an impressive detection limit of 14 ng·mL− 1 (S/N = 3). The practical application of this sensing platform to bromate determination in flour-based food products and tap water samples yielded satisfactory recoveries, ranging from 87.4 to 104.4%, with relative standard deviations below 3.5%. These findings highlight the great potential of the as-synthesized N-CDs as a reliable fluorescent nanoprobe for sensitive and selective bromate detection in complex food and environmental samples.