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Article Dans Une Revue Nano Letters Année : 2009

Raman Spectroscopy of Graphene Edges

Résumé

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.

Dates et versions

hal-00353030 , version 1 (14-01-2009)

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C. Casiraghi, A. Hartschuh, H. Qian, S. Piscanec, C. Georgi, et al.. Raman Spectroscopy of Graphene Edges. Nano Letters, 2009, 9, pp.1433. ⟨hal-00353030⟩

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