Preparation of Nitrogen Self-doped Carbon Quantum Dots and Detection of Fe3+
李浩哲① LI Hao-zhe；刘德鸿① LIU De-hong；杨丹①YANG Dan；
冉诗兰① RAN Shi-lan；张星①② ZHANG Xing；郝艳玲①②HAO Yan-ling
（①兴义民族师范学院物理与工程技术学院，兴义 562400；②黔西南州微纳功能材料重点实验室，兴义 562400）
（①College of Physics and Engineering Technology，Minzu Normal University of Xingyi，Xingyi 562400，China；②Key Laboratory for Micro-nano Functional Materials of Qianxinan，Xingyi 562400，China）
摘要：以富含氨基酸的薏仁米为原料，通过水热法合成了氮自掺杂绿色荧光碳量子点（N-CQDs）。通过 TEM、FTIR、XPS、PL 和UV-Vis 对 N-CQDs 的形貌、表面结构及光学性质进行了表征分析，并将其应用于离子检测。结果表明，N-CQDs 存在明显的晶格条纹，表面含有羟基、羧基、氨基等官能团，在水中有良好的溶解性；Fe3+对 N-CQDs 的荧光有明显的猝灭作用，在 100-200滋mol/L 的浓度范围内，Fe3+浓度与 N-CQDs 的荧光强度成线性关系，表明 N-CQDs 在一定范围内能作为荧光探针检测水溶液中微量的 Fe3+，检出限为 10滋mol/L，该研究为制备自掺杂碳量子点提供了参考，为新型荧光碳点的实际应用提供了有益借鉴。
Abstract: Nitrogen self-doped green fluorescent carbon quantum dots (N-CQDs) were synthesized by hydrothermal method from Coix seed, which is rich in amino acids. The morphology, surface structure and optical properties of N-CQDs were characterized by TEM FTIR, XPS, PL and UV-Vis, and then applied to ion detection. The results show that N-CQDs has obvious lattice fringes, containing hydroxyl, carboxyl, amino and other functional groups on the surface, and has good solubility in water. Fe3+ has a significant quenching effect on the fluorescence of N-CQDs. In the concentration range of 100-200滋mol/L, the concentration of Fe3+ is linear with the fluorescence intensity of
N-CQDs, indicating that N-CQDs can be used as a fluorescence probe to detect trace Fe3+ in aqueous solution in a certain range, and the detection limit is 10滋mol/L. This study provides a reference for the preparation of self-doped carbon quantum dots and provides a useful reference for the practical application of new fluorescent carbon dots.
关键词：薏仁米；水热法；自掺杂碳量子点；荧光探针
Key words: coix seed；hydrothermal method；self-doped carbon quantum dots；fluorescence probe
中图分类号：TB383 文献标识码：A 文章编号：1006-4311（2024）29-095-04 doi:10.3969/j.issn.1006-4311.2024.29.029
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