期刊
JOURNAL OF MATERIALS CHEMISTRY B
卷 7, 期 9, 页码 1494-1502出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tb03103g
关键词
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资金
- Beijing Municipal Graphene Science and Technology Innovation Project [Z161100002116026]
- International Partnership Program of Chinese Academy of Sciences [GJHZ1818]
- National Natural Science Foundation of China [21874143]
A novel electrochemical strategy for simple and facile synthesis of semicarbazide functionalized nitrogendoped graphene quantum dots (N-GQDs) was reported, based on direct exfoliation and oxidation from graphite rods. The average diameter of the as-synthesized N-GQDs is about 20 nm, and their dispersion is bright yellow due to the rich nitrogen and oxygen functional groups on their surface. The N-GQD dispersion was further applied in the selective detection of ferric ions (Fe3+) based on the photoluminescence (PL) quenching of N-GQDs after adding Fe3+. The fluorescent sensor has a wide linear range of 0-200 mu M and a detection limit of 0.87 mu M, which is much lower than the maximum level (0.3 mg L-1, equivalent to 5.4 mu M) of Fe3+ permitted in drinking water by the U. S. Environmental Protection Agency (EPA). Moreover, these novel N-GQDs exhibit much wider emission bands, which extend into the entire visible region, and emit three primary color fluorescence independently. This distinctive behavior of the as-prepared GQDs not only breaks the limitation that traditional reported GQDs only exhibit blue emission in the shortwavelength region, but may also provide a new research platform for further applications of GQDs in real environmental detection and biological imaging systems.
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