期刊
NANOSCALE
卷 5, 期 24, 页码 12272-12277出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr04402e
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资金
- Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry
- National Natural Science Foundation of China [21201159, 61176016, 21104075]
- China Postdoctoral Science Foundation [2012M510892]
- Science and Technology Department of Jilin Province [20121801]
- Returnee startup fund of Jilin
- CAS
- Innovation and Entrepreneurship Program of Jilin
- CIAC
A facile hydrothermal synthesis route to N and S, N co-doped graphene quantum dots (GQDs) was developed by using citric acid as the C source and urea or thiourea as N and S sources. Both N and S, N doped GQDs showed high quantum yield (78% and 71%), excitation independent under excitation of 340-400 nm and single exponential decay under UV excitation. A broad absorption band in the visible region appeared in S, N co-doped GQDs due to doping with sulfur, which alters the surface state of GQDs. However, S, N co-doped GQDs show different color emission under excitation of 420-520 nm due to their absorption in the visible region. The excellent photocatalytic performance of the S, N co-doped GQD/TiO2 composites was demonstrated by degradation of rhodamine B under visible light. The apparent rate of S, N: GQD/TiO2 is 3 and 10 times higher than that of N: GQD/TiO2 and P25 TiO2 under visible light irradiation, respectively.
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