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<p>In this study, a simple and efficient method for synthesizing nitrogen-doped carbon quantum dots (N-CQDs) has been developed through a one-step hydrothermal process using <i>hedyotis diffusa</i> willd. The morphology, chemical composition, and optical properties of the resulting N-CQDs were thoroughly characterized. The synthesized N-CQDs exhibited a spherical shape with an average particle size of 4.32&#xa0;nm, and the crystal lattice spacing was determined to be 0.17&#xa0;nm. Notably, the N-CQDs demonstrated a significant fluorescence quenching effect in the presence of Fe<sup>3</sup>⁺ ions, exhibiting high selectivity and sensitivity. The detection limit for Fe<sup>3</sup>⁺ ions was found to be 6.62 × 10⁻<sup>3</sup>&#xa0;μmol/L within a linear range of 0.01–0.1&#xa0;μmol/L. Furthermore, the N-CQDs displayed significant antimicrobial activity against both Gram-positive (<i>Staphylococcus aureus</i>) and Gram-negative (<i>Escherichia coli</i>) bacteria, with minimum inhibitory concentration (MIC) values of 0.055&#xa0;mg/mL and 0.038&#xa0;mg/mL, respectively. These findings suggest that the N-CQDs can serve as an effective fluorescent sensor and a promising antibacterial agent. This work provides a new strategy for the preparation of N-CQDs from natural plant sources, highlighting their potential applications as both fluorescent sensors and antimicrobial agents.</p>

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Synthesis of N-doped Carbon Quantum Dots as an Effective Fluorescent Sensor of Fe3+ Ions and a Potent Antibacterial Agent

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Shuchen Pei,
  • Shaoyu Cai,
  • Kangli Yan,
  • Jinjing Zhou,
  • Kang Luo,
  • Xinan Chen

摘要

In this study, a simple and efficient method for synthesizing nitrogen-doped carbon quantum dots (N-CQDs) has been developed through a one-step hydrothermal process using hedyotis diffusa willd. The morphology, chemical composition, and optical properties of the resulting N-CQDs were thoroughly characterized. The synthesized N-CQDs exhibited a spherical shape with an average particle size of 4.32 nm, and the crystal lattice spacing was determined to be 0.17 nm. Notably, the N-CQDs demonstrated a significant fluorescence quenching effect in the presence of Fe3⁺ ions, exhibiting high selectivity and sensitivity. The detection limit for Fe3⁺ ions was found to be 6.62 × 10⁻3 μmol/L within a linear range of 0.01–0.1 μmol/L. Furthermore, the N-CQDs displayed significant antimicrobial activity against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, with minimum inhibitory concentration (MIC) values of 0.055 mg/mL and 0.038 mg/mL, respectively. These findings suggest that the N-CQDs can serve as an effective fluorescent sensor and a promising antibacterial agent. This work provides a new strategy for the preparation of N-CQDs from natural plant sources, highlighting their potential applications as both fluorescent sensors and antimicrobial agents.