微波法制备掺氮碳点及其用作探针检测铁离子

王诗琪; 涂雨菲; 刘之晓; 左丹英; 许静; 张宏伟

doi:doi:10.3788/fgxb20194006.0751

发光学报, 2019, 40 (6): 751, 网络出版: 2019-09-03

微波法制备掺氮碳点及其用作探针检测铁离子

Microwave Synthesis of Nitrogen-doped Carbon Dots and Its Application in Detection of Ferric Ions

论文大纲

王诗琪 ^*涂雨菲刘之晓左丹英许静张宏伟

作者单位

武汉纺织大学材料科学与工程学院, 湖北武汉 430073

碳量子点氮掺杂荧光探针铁离子 garbon dot nitrogen-doped fluorescent probe ferric ion

摘要

为了研究氮掺杂对纳米碳点荧光发射行为的影响和探索掺氮碳点的快速制备途径, 以2-氨基对苯二甲酸为前驱体, 与不同的修饰剂一起溶解于去离子水中, 经微波辐射3 min, 一步法合成了新型掺氮碳点。实验结果表明: 制备的掺氮碳点水溶性好, 发蓝色荧光, 且发射行为不依赖于激发波长; 颗粒近似为球形, 尺寸5～8 nm, 晶面间距为0.23 nm, 接近石墨碳(100)面晶格结构; Fe3+通过与掺氮碳点表面含氧基团的络合配位, 可有效地猝灭其荧光, Fe3+浓度在5～60 μmol·L-1的范围内与相对荧光强度呈现良好的线性关系, 检出限约为1.01 μmol·L-1, 可以作为检测Fe3+浓度的荧光探针。

Abstract

In order to study the impact of nitrogen-doping on the photoluminescence properties of carbon nanodots and explore a facile preparing approach for nitrogen-doping carbon dots(N-CDs), 2-aminoterephthalic acid as the precursor and various modifiers were firstly dissolved in deionized water. Thereafter the as-prepared solution was treated by microwave irradiation of 1 kW for 3 min and consequently a novel N-CD was obtained by the one-pot method. Experimental results indicated that the as-synthesized N-CDs were very soluble in water and exhibited bright blue emission under ultraviolet light. Furthermore, the fluorescence emission was independent of excitation wavelengths. The N-CDs showed an approximately spheric particle with a size of 5-8 nm and an obvious fringe distance of 0.23 nm, close to the (100) crystal lattice distance of graphitic carbon structure. The fluorescence of the obtained N-CDs could be effectively quenched by ferric ions via interacting with functional groups on the surface of N-CDs to form complex compounds. The normalized intensity versus the concentration of ferric ions showed a good linear relationship under the concentration in the range of 5-60 μmol·L-1. The detection limit of ferric ions was estimated to be 1.01 μmol·L-1. These results suggested that the as-synthesized N-CDs could be used as an effective fluorescent sensing platform for ferric ions in water.

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王诗琪, 涂雨菲, 刘之晓, 左丹英, 许静, 张宏伟. 微波法制备掺氮碳点及其用作探针检测铁离子[J]. 发光学报, 2019, 40(6): 751. WANG Shi-qi, TU Yu-fei, LIU Zhi-xiao, ZUO Dan-ying, XU Jing, ZHANG Hong-wei. Microwave Synthesis of Nitrogen-doped Carbon Dots and Its Application in Detection of Ferric Ions[J]. Chinese Journal of Luminescence, 2019, 40(6): 751.

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