School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China.
Institute of Environmental Science, Shanxi University, Taiyuan, 030006, China.
Anal Bioanal Chem. 2022 Oct;414(24):7253-7263. doi: 10.1007/s00216-022-04277-z. Epub 2022 Aug 18.
In this paper, intrinsic dual-emission fluorescent carbon dots (CDs) doped with N and S atoms have been firstly fabricated. The characterization results show that CDs are successfully synthesized with two separate fluorescence emissions at 468 nm and 628 nm, respectively. The strong and selective interaction of Cr (VI) ions with CDs lead to obvious fluorescence decrease of CDs at 468 nm, which is caused by a mixed quenching mechanism. At the same time, the fluorescence at 628 nm increase. Interestingly, the CDs solution show obvious color change under the daylight and UV light, so visualization detection of Cr (VI) can be realized in water samples. Based on the data of the emission intensity ratios of F/F, Cr (VI) can be detected from 3.8 to 38.9 μM combined with the linear correlation coefficient of 0.998, and the lowest detection concentration is 47.2 nM. The platform is satisfactorily applied to the detection of Cr (VI) ions in water samples. In addition, the CDs could be applied as fluorescent probes for cell imaging with dual fluorescent emission.
本文首次制备了氮、硫共掺杂的内禀双发射荧光碳点（CDs）。表征结果表明，成功合成了具有 468nm 和 628nm 两个独立荧光发射的 CDs。Cr（VI）离子与 CDs 的强选择性相互作用导致 CDs 在 468nm 处的荧光明显减弱，这是由混合猝灭机制引起的。同时，628nm 处的荧光增强。有趣的是，CDs 溶液在日光和紫外光下显示出明显的颜色变化，因此可以在水样中实现 Cr（VI）的可视化检测。基于 F/F 的发射强度比的数据，结合 0.998 的线性相关系数，Cr（VI）可以在 3.8 到 38.9 μM 的范围内进行检测，最低检测浓度为 47.2 nM。该平台可满意地应用于水样中 Cr（VI）离子的检测。此外，CDs 可用作具有双荧光发射的细胞成像荧光探针。
