Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 410, Issue 29, Pages 7701-7710Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-018-1387-x
Keywords
Fluorescent probe; Carbon quantum dots; Copper ion; Glutathione; pH
Funding
- National Natural Science Foundation of China [21475152, 21576296]
- Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety [2018TP1003]
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A facile one-step hydrothermal method was developed to synthesize nitrogen-doped carbon quantum dots (N-CQDs) by utilizing hexamethylenetetramine as the carbon and nitrogen source. The quantum yield (QY) of 21.7% was under the excitation wavelength of 420nm with maximum emission at 508nm. This N-CQD fluorescent probe has been successfully applied to selectively determine the concentration of copper ion (Cu2+) with a linear range of 0.1-40M and a limit of detection of 0.09M. In addition, the fluorescence of N-CQDs could be effectively quenched by Cu2+ and specifically recovered by glutathione (GSH), which render the N-CQDs as a premium fluorescent probe for GSH detection. This fluorescence turn-on protocol was applied to determine GSH with a linear range of 0.1-30M as well as a detection limit of 0.05M. For pH detection, there is good linearity in the pH range of 2.87-7.24. Furthermore, N-CQD is a promising and convenient fluorescent pH, Cu2+, and glutathione sensor with brilliant biocompatibility and low cytotoxicity in environmental monitoring and bioimaging applications.
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