Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 15: C/diamond I

HL 15.5: Vortrag

Dienstag, 24. März 2009, 10:30–10:45, POT 51

Raman Spectroscopy on folded Graphene — •Robert Panknin, Philipp Klar, Cinzia Casiraghi, and Stephanie Reich — Fachbereich Physik, Freie Universität, Berlin

Raman spectroscopy is a non-destructive technique able to identify graphene from graphite, to probe the doping level of graphene and determine the amount of defects [1-3].

Here we investigate the effect of the interaction between graphene layers and their stacking order by Raman spectroscopy. The stacking order affects the second order Raman spectrum, as shown in graphite (AB stacking) and turbostratic (random stacking) graphite [4].

Graphene and few graphene layers are obtained by micromechanical cleavage. Folded flakes are then selected. We show that the folding changes the electronic structure of graphene and this can be uniquely probed by Raman spectroscopy.

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Pisana, S. et al., Nature Mater. 6, 198-201 (2007)
Casiraghi, C. et al., Appl. Phys. Lett. 91, 233108 (2007)
Lespade P. et al., Carbon 22, 375 (1984)

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