期刊
ADVANCED FUNCTIONAL MATERIALS
卷 22, 期 22, 页码 4763-4770出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201200922
关键词
g-C3N4; nanosheets; thermal oxidation etching; photocatalysis
类别
资金
- Major Basic Research Program, Ministry of Science and Technology of China [2009CB220001]
- NSFC [50921004, 51002160, 21090343, 51172243]
- Solar Energy Initiative of CAS
Graphitic (g)-C3N4 with a layered structure has the potential of forming graphene-like nanosheets with unusual physicochemical properties due to weak van der Waals forces between layers. Herein is shown that g-C3N4 nanosheets with a thickness of around 2 nm can be easily obtained by a simple top-down strategy, namely, thermal oxidation etching of bulk g-C3N4 in air. Compared to the bulk g-C3N4, the highly anisotropic 2D-nanosheets possess a high specific surface area of 306 m2 g-1, a larger bandgap (by 0.2 eV), improved electron transport ability along the in-plane direction, and increased lifetime of photoexcited charge carriers because of the quantum confinement effect. As a consequence, the photocatalytic activities of g-C3N4 nanosheets have been remarkably improved in terms of OH radical generation and photocatalytic hydrogen evolution.
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