Wan Zherui, Cui Xiaoxu, Li Zhonghao, Zhong Haorui, Liu Yilei, Liang Yesheng, Zhang Zhiyong, Yang Guang
Department of Chemistry and Chemical Engineering, College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, China.
Luminescence. 2024 Dec;39(12):e70058. doi: 10.1002/bio.70058.
Herein, a kind of N-doped fluorescent carbon dots (N-CDs) were prepared by using melamine and carboxymethyl cellulose (CMC) as precursors through a straightforward hydrothermal method. The designed sensor displayed a uniform nanoscale distribution, excellent hydrophilicity, and strong fluorescence emission with a fluorescence quantum yield of 37.98%. Moreover, the N-CDs could be utilized for Fe detection by the fluorescence "On-Off" transition via the mechanism of internal filtration effect (IFE) and static quenching process. Two good linear relationships within the concentrations of Fe from 10 to 100μM and 100 to 500 μM could be obtained, which indicated that the "On-Off" fluorescent sensor could quantitative analysis of Fe and the calculated detection limit (LOD) was 0.510 μM (3σ/slope). Additionally, the N-CDs could be used for the detection of Fe in the solid phase based on the fluorescence "On-Off" strategy, which is promising for anticounterfeiting application.
在此，以三聚氰胺和羧甲基纤维素（CMC）为前驱体，通过简单的水热法制备了一种氮掺杂荧光碳点（N-CDs）。所设计的传感器呈现出均匀的纳米级分布、优异的亲水性以及较强的荧光发射，荧光量子产率为37.98%。此外，N-CDs可通过内滤效应（IFE）和静态猝灭过程的机制，利用荧光“开-关”转变来检测铁。在铁浓度为10至100μM和100至500μM范围内可获得两个良好的线性关系，这表明“开-关”荧光传感器可对铁进行定量分析，计算得到的检测限（LOD）为0.510μM（3σ/斜率）。此外，基于荧光“开-关”策略，N-CDs可用于固相中铁的检测，这在防伪应用方面具有前景。
