期刊
NANOSCALE
卷 7, 期 5, 页码 1872-1878出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr06365a
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资金
- National Nature Scientific Foundation of China [21175112, 21375112]
- Program of Science and Technology of Xiamen for University Innovation [3502Z20143025]
A facile bottom-up method for the synthesis of highly fluorescent nitrogen-doped graphene quantum dots (N-GQDs) has been developed via a one-step pyrolysis of citric acid and tris(hydroxymethyl)amino-methane. The obtained N-GQDs emitted strong blue fluorescence under 365 nm UV light excitation with a high quantum yield of 59.2%. They displayed excitation-independent behavior, high resistance to photo-bleaching and high ionic strength. In addition to the good linear relationship between the fluorescence intensity of the N-GQDs and pH in the range 2-7, the fluorescence intensity of the N-GQDs could be greatly quenched by the addition of a small amount of 2,4,6-trinitrophenol (TNP). A sensitive approach has been developed for the detection of TNP with a detection limit of 0.30 mu M, and a linearity ranging from 1 to 60 mu M TNP could be obtained. The approach was highly selective and suitable for TNP analysis in natural water samples.
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