Raman Spectroscopy of Graphene Edges

Details Raman Spectroscopy of Graphene Edges Raman Spectroscopy of Graphene Edges

2008-10-29

arxiv.org/abs/0810.5358v1

Nano Lett., 9, 1433 (2009)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1021/nl8032697

Graphene edges are of particular interest, since their chirality determines the electronic properties. Here we present a detailed Raman investigation of graphene flakes with well defined edges oriented at different crystallographic directions. The position, width and intensity of G and D peaks at the edges are studied as a function of the incident light polarization. The D-band is strongest for light polarized parallel to the edge and minimum for perpendicular orientation. Raman mapping shows that the D peak is localized in proximity of the edge. The D to G ratio does not always show a significant dependence on edge orientation. Thus, even though edges can appear macroscopically smooth and oriented at well defined angles, they are not necessarily microscopically ordered.

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