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<p>Carbon dots have attracted considerable attention in the field of ion sensing due to their excellent optical properties and biocompatibility. Currently, arginine-based carbon dots are predominantly synthesized via hydrothermal methods, which suffer from long synthesis times and the use of a single solvent system. In this study, L-arginine was employed as the sole carbon source, utilizing its intrinsic alkalinity to adjust the solution pH. Nitrogen-doped carbon dots were synthesized in one step in an ethanol system using a microwave reactor at 210&#xa0;°C. The as-prepared carbon dots exhibit an emission peak at 350&#xa0;nm under 290&#xa0;nm excitation, with a fluorescence quantum yield of 11.31% and a full width at half maximum (FWHM) of only 54&#xa0;nm, which is significantly narrower than that of carbon dots synthesized by conventional microwave methods. A fluorescence sensor for Fe³⁺ constructed based on these carbon dots demonstrates good selectivity and a wide linear response range (0.5–5180µmol·L<sup>− 1</sup>), providing a simple and efficient synthetic strategy and material foundation for the development of high-performance fluorescence sensors.</p>

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Preparation of N-Doped Carbonized Polymer Dots with Narrow FWHM Based on Single Source with Self-Alkaline Induced Hydrolysis for Fluorescence Probe

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Yuran Tang,
  • Jieting Wen,
  • Jing Wang,
  • Dingda Xu,
  • Yuan Peng

摘要

Carbon dots have attracted considerable attention in the field of ion sensing due to their excellent optical properties and biocompatibility. Currently, arginine-based carbon dots are predominantly synthesized via hydrothermal methods, which suffer from long synthesis times and the use of a single solvent system. In this study, L-arginine was employed as the sole carbon source, utilizing its intrinsic alkalinity to adjust the solution pH. Nitrogen-doped carbon dots were synthesized in one step in an ethanol system using a microwave reactor at 210 °C. The as-prepared carbon dots exhibit an emission peak at 350 nm under 290 nm excitation, with a fluorescence quantum yield of 11.31% and a full width at half maximum (FWHM) of only 54 nm, which is significantly narrower than that of carbon dots synthesized by conventional microwave methods. A fluorescence sensor for Fe³⁺ constructed based on these carbon dots demonstrates good selectivity and a wide linear response range (0.5–5180µmol·L− 1), providing a simple and efficient synthetic strategy and material foundation for the development of high-performance fluorescence sensors.