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| Interaction of Nitrogen-doped Graphene Quantum Dots with Fe3+ |
| WANG Ying, LIU Fang tong, ZHANG Ke-shi, JIN Li
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Abstract Nitrogen-doped graphene quantum dots were synthesized by citric acid pyrolysis method. Based on the strong fluorescence quenching effect of Fe3+ on nitrogen-doped graphene quantum dots, a method for detecting Fe3+ was established. The study found that there is a good linear relationship between the fluorescence intensity of nitrogen-doped graphene quantum dots (F0/F) and the concentration of Fe3+.The linear range is 0.0185~0.5365 mmol/L. The detection limit is 1.73 nmol/L. At the same time, the effects of pH,temperature and time on the fluorescence quenching system were discussed, and the experimental conditions were optimized. The temperature quenching mechanism and thermodynamic calculations were used to investigate the mechanism of fluorescence quenching. It was shown that the process is a spontaneous、exothermic、dynamic quenching process, and the detection of Fe3+ in foods was realized. It provides a theoretical and experimental basis for the establishment of new fluorescence sensors.
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Published: 25 May 2018
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