Sun Dong, Liu Tiantian, Wang Chunfeng, Yang Lifang, Yang Shengkai, Zhuo Kelei
Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, PR China.
Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Oct 15;240:118598. doi: 10.1016/j.saa.2020.118598. Epub 2020 Jun 11.
Nitrogen and sulfur co-doped carbon dots (N/S-CDs) were prepared by a simple hydrothermal method using gardenia fruit as precursor. The N/S-CDs are nearly spherical particles with a size of 2.1 nm and possess excellent fluorescence stability in a wide pH range and high NaCl concentrations, as well as under UV light irradiation. The absolute quantum yield (QY) without any surface modification reaches up to 10.7%. Meanwhile, the N/S-CDs can be quenched by Hg (turn-off), while the quenched fluorescence can be recovered (turn-on) by introducing cysteine (Cys), with linear ranges of 2-20 μM for Hgand 0.1-2.0 μM for Cys. On the basis of the on-off-on sensing mode, the N/S-CDs can be used to detect Hg and Cys. Hence, the N/S-CDs would be a promising sensor in environmental and biological analysis.
以栀子果实为前驱体，通过简单的水热法制备了氮硫共掺杂碳点（N/S-CDs）。N/S-CDs为近球形颗粒，尺寸为2.1纳米，在较宽的pH范围、高NaCl浓度以及紫外光照射下均具有优异的荧光稳定性。未经任何表面修饰时，其绝对量子产率（QY）高达10.7%。同时，N/S-CDs能被Hg淬灭（关闭），而通过引入半胱氨酸（Cys）可使淬灭的荧光恢复（开启），Hg的线性范围为2-20μM，Cys的线性范围为0.1-2.0μM。基于这种开启-关闭-开启的传感模式，N/S-CDs可用于检测Hg和Cys。因此，N/S-CDs在环境和生物分析中有望成为一种有前景的传感器。
