Journal
CARBON
Volume 80, Issue -, Pages 213-221Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.08.059
Keywords
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Funding
- National High Technology Research and Development Program of China (863 Program) [2012AA06A304]
- National Science Foundation of China [21177044, 21377169]
- Scientific Research Key Project of Hubei Provincial Department of Education (China) [D20121503]
- Natural Science Foundation of Hubei Province (China) [2012FFB04702]
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Graphitic carbon nitride (g-C3N4) has attracted worldwide attention, because of its promising potential applications and theoretical prediction of its unique properties. Herein, 1-, 2-and 4-layer g-C3N4 nanosheets were synthesized in a well-crystallized form by controlling the intercalation time in a simple intercalation-exfoliation process. The electronic structures of the nanosheets were captured in their Raman spectra that clearly evolved with the layer number of the nanosheets for the first time. A clear correlation between the spectral properties and the layer number of the nanosheets was clarified by combining Raman spectra and the first-principles calculations. Raman vibrational modes of g-C3N4 were assigned. The layer-layer deformation vibrations and related in-plane twisting vibrations or symmetrical stretching vibrations reflected the change in the electronic structure of the nanosheets with different layers. The results may shed light on brand-new opportunities for significant improvements in the synthesis, structure, electronic and optical properties of single-layer and ultrathin g-C3N4 nanosheets toward desirable functional materials. (C) 2014 Elsevier Ltd. All rights reserved.
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