荧光
分析化学(期刊)
化学
离子
水溶液中的金属离子
碳纤维
发光
兴奋剂
猝灭(荧光)
检出限
光化学
材料科学
光电子学
光学
物理
色谱法
复合材料
有机化学
复合数
作者
Xiping Mei,Dongxiu Wang,Songbai Wang,Junfen Li,Chuan Dong
标识
DOI:10.1007/s00216-022-04277-z
摘要
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 F468/F628, 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.
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