期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 214, 期 -, 页码 320-325出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.02.048
关键词
Copper ion; Grapheme quantum dots; Catalytic oxidation; Spectral overlap; Fluorescent analysis
类别
资金
- National Natural Science Foundation of China [51802118]
- Natural Science Foundation of Shandong Province [2018GSF118166, ZR2016BB29]
A simple and highly efficient off-on fluorescent sensor based on grapheme quantumdots (GQDs) for Cu2+ was developed. In this sensing platform, the fluorescence of GQDs was quenched in the presence of 2,4-dinitrophenylcysteine (DNPC), which is the reaction product of 1-chloro-2,4-dinitrobenzene (CDNB) and L-cysteine, owing to the spectral overlap between the absorption of DNPC and the excitation of GQDs. In the presence of Cu2+, L-cysteinewas catalytically oxidized to L-cystine by O-2, resulting in the reduction of DNPC. Thus, the fluorescence of GQDs was recovery. Based on this, the fluorescent detection of Cu2+ could be achieved. The proposed sensing strategy offered a selective identification of Cu2+ with a detection limit of 4.5 nM. Additionally, the practical application of this assay for Cu2+ determination in real water samples was also demonstrated. (C) 2019 Elsevier B.V. All rights reserved.
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