Shen Tong-Yang, Jia Pei-Yun, Chen Da-Shu, Wang Li-Na
School of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26, Hexing Road, Harbin 150040, PR China.
School of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26, Hexing Road, Harbin 150040, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Mar 5;248:119282. doi: 10.1016/j.saa.2020.119282. Epub 2020 Dec 11.
Carbon quantum dots (CQDs), owing to their characteristic luminescent properties, have become a new favorite in the field of luminescence. They have been widely used in light emitting diode, ion detection, cell-imaging, ect. Herein a facile synthesis method of nitrogen-doped carbon quantum dots (N-CQDs) has been developedviaa one-step hydrothermal of glucose and m-phenylenediamine. The chemical composition, surface functional groups, and crystal structure of so prepared N-CQDs were systematically characterized. The characterizations indicate that nitrogen has been chemically doped in the CQDs and the N-CQDs crystallize in a graphene structure. Photoluminescence (PL) measurements show that the N-CQDs emit strong blue emission under the irradiation of ultraviolet. The emission is excitation-dependent, is resistant to photo bleaching and high ionic strength, and slightly decreases with the increase of temperature. The quantum yield of them is about 17.5%. The PL intensity of N-CQDs quenches linearly with the increase of the concentrations of Fe(0.5-1.0 mM) and CrO(0.3-0.6 mM), which are a kind of excellent fluorescent probe for the detection of Fe and CrO. The quenching mechanism of Fe and CrOis verified to be a static quenching mechanism based on inner filter effect. The N-CQDs are also found to be a good cell-imaging reagent of Hela cells.
碳量子点（CQDs）因其独特的发光特性，已成为发光领域的新宠。它们已广泛应用于发光二极管、离子检测、细胞成像等领域。在此，通过葡萄糖和间苯二胺的一步水热法开发了一种简便的氮掺杂碳量子点（N-CQDs）合成方法。对如此制备的N-CQDs的化学成分、表面官能团和晶体结构进行了系统表征。表征表明氮已化学掺杂在CQDs中，且N-CQDs以石墨烯结构结晶。光致发光（PL）测量表明，N-CQDs在紫外光照射下发出强烈的蓝色发射。该发射依赖于激发，抗光漂白和高离子强度，且随温度升高略有降低。它们的量子产率约为17.5%。N-CQDs的PL强度随Fe（0.5 - 1.0 mM）和CrO（0.3 - 0.6 mM）浓度的增加而线性猝灭，它们是检测Fe和CrO的一种优良荧光探针。基于内滤效应，验证了Fe和CrO的猝灭机制为静态猝灭机制。还发现N-CQDs是一种良好的Hela细胞成像试剂。
