Journal
DIAMOND AND RELATED MATERIALS
Volume 19, Issue 5-6, Pages 608-613Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2009.12.013
Keywords
Graphene; Mechanical exfoliation; Micro-Raman; Spontaneous strain
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A micro-Raman investigation was carried out on several flakes of monolayer (1 L) graphene obtained by the micro-mechanical exfoliation technique and, then, put on a c-Si wafer coated by a SiO2 thin film. Some of the 1 L zones show a remarkable dispersion of the 2D-overtone wavenumber as a function of the position within the graphene sheet, and, in some case, a significant broadening of the E-2g phonon (G band) is associated to this wavenumber shift of 2D-band. Such effects were studied, in particular, for a 1 L zone characterized by a rather strong lattice disorder, as revealed by the strong D/G band intensity ratio, and for other zones quite ordered, showing a vanishing intensity of the D band. Moreover, by moving along different directions within 1 L graphene sheets, different trends for 20 wavenumber and E-2g phonon bandwidth vs. position were observed. All these reported behaviours are explained in terms of different distributions of intrinsic uniaxial strain occurring within the 1 L graphene sheets. (C) 2010 Elsevier B.V. All rights reserved.
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