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<p>Recently, the use of natural products to synthesize of carbon dots (CDs) has received much attention. Herein, citrus juice and urea were successfully turned into nitrogen-doped carbon dots (N-CDs) via the hydrothermal-carbonization route. The synthesized N-CDs have good fluorescence luminescence performance and high optical stability. In addition, the N-CDs exhibited selective and sensitive fluorescence quenching behavior towards Fe<sup>3+</sup> ions and the limit of detection (LOD) can reach 1.59 µM. Moreover, environmentally friendly fluorescent inks were prepared with N-CDs as fluorescent material and cellulose (HPC, HEC, HEMC, HPMC) as a binder. These fluorescent inks meet the viscosity (4000–12000 mPa·s) and surface tension (20–60 mN/m) requirements of screen printing. Fluorescent ink still maintains good fluorescence after forming a film on filter paper.</p>

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Eco-Friendly Synthesis of Nitrogen-Doped Fluorescent Carbon Dots from Citrus Juice for Detection of Fe3+ Ions and Anti-Counterfeiting Printing Applications

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Tianbao Fang,
  • Lei Wu,
  • Shaoyun Huang,
  • Ting Guo,
  • Yafeng Deng

摘要

Recently, the use of natural products to synthesize of carbon dots (CDs) has received much attention. Herein, citrus juice and urea were successfully turned into nitrogen-doped carbon dots (N-CDs) via the hydrothermal-carbonization route. The synthesized N-CDs have good fluorescence luminescence performance and high optical stability. In addition, the N-CDs exhibited selective and sensitive fluorescence quenching behavior towards Fe3+ ions and the limit of detection (LOD) can reach 1.59 µM. Moreover, environmentally friendly fluorescent inks were prepared with N-CDs as fluorescent material and cellulose (HPC, HEC, HEMC, HPMC) as a binder. These fluorescent inks meet the viscosity (4000–12000 mPa·s) and surface tension (20–60 mN/m) requirements of screen printing. Fluorescent ink still maintains good fluorescence after forming a film on filter paper.