期刊
SCIENCE CHINA-MATERIALS
卷 60, 期 2, 页码 109-118出版社
SCIENCE PRESS
DOI: 10.1007/s40843-016-5131-9
关键词
graphitic carbon nitrides; monolayer nanosheets; photocatalysis; fluorescence; cell imaging
资金
- National Basic Research Program of China [2014CB932400]
- National Natural Science Foundation of China [51525204, 51302274]
- Shenzhen Basic Research Project [ZDSYS20140509172959981]
- Key Laboratory of Advanced Materials of Ministry of Education [2016AML02]
Two-dimensional graphitic carbon nitride (g-C3N4) nanosheets (GCNNs) have been considered as an attractive metal-free semiconductor because of their superior catalytic, optical, and electronic properties. However, it is still challenging to prepare monolayer GCNNs with a reduced lateral size in nanoscale. Herein, a highly efficient ultrasonic technique was used to prepare nanosized monolayer graphitic carbon nitride nanosheets (NMGCNs) with a thickness of around 0.6 nm and an average lateral size of about 55 nm. With a reduced lateral size yet monolayer thickness, NMGCNs show unique photo-responsive properties as compared to both large-sized GCNNs and GCN quantum dots. A dispersion of NMGCNs in water has good stability and exhibits strong blue fluorescence with a high quantum yield of 32%, showing good biocompatibility for cell imaging. Besides, compared to the multilayer GCNNs, NMGCNs show a highly improved photocatalysis under visible light irradiation. Overall, NMGCNs, characterized with monolayer and nanosized lateral dimension, fill the gap between large size (very high aspect ratio) and quantum dot-like counterparts, and show great potential applications as sensors, photo-related and electronic devices.
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