Nitrogen-doped carbon dots synthesized from acrylic acid and ethylenediamine for simple and selective determination of cobalt ions in aqueous media
Nitrogen-doped carbon dots synthesized from acrylic acid and ethylenediamine for simple and selective determination of cobalt ions in aqueous media
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DOI：
10.1016/j.jlumin.2018.10.059
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发表时间：
2019-02-01
影响因子：
3.6
通讯作者：
Zhang, Yong
中科院分区：
文献类型：
--
作者：
Jing, Na;Tian, Min;Zhang, Yong
以丙烯酸和乙二胺为原料，采用水热法一锅法合成了平均粒径为4.28 nm、量子产率为22.7%的氮掺杂荧光碳量子点（NCDs）。当在350 nm处激发时，NCD显示出中心在425 nm处的强发射峰，对应于蓝色荧光。有趣的是，对于NCD，在添加钴离子（Co2+）后观察到荧光显著降低。基于这种特殊的现象，合成的NCD被证明是一种有效的荧光探针，用于在1.0-60 μ M的线性范围内选择性和定量分析低浓度Co 2+。检测限（LOD）为0.25 μ M。通过紫外-可见吸收光谱和时间分辨荧光光谱对Co2+作为猝灭剂与NCDs的相互作用进行了进一步的研究，证实了Co2+与NCDs的某些官能团之间的相互作用是导致荧光猝灭的主要原因。
Fluorescent nitrogen-doped carbon dots (NCDs) with a quantum yield of 22.7% and an average size of about 4.28 nm were hydrothermally synthesized using acrylic acid and ethylenediamine in one pot. When excited at 350 nm, the NCDs showed a strong emission peak centered at 425 nm, corresponding to blue fluorescence. Interestingly, for NCDs, significant decrease in fluorescence was observed upon addition of cobalt ions (Co2+). On the basis of this particular phenomenon, the synthesized NCDs are demonstrated as an effective fluorescence probe for the selective and quantitative analysis of low concentration Co2+ in a linear range of 1.0-60 mu M. Limit of detection (LOD) is 0.25 mu M. Further detailed investigations on the interactions of NCDs with Co2+ as quencher by using various techniques (UV-vis absorption and time-resolved fluorescence techniques) confirmed that the fluorescence quenching is mainly induced by the interaction of between Co2+ and some functional groups of NCDs.