Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 59: Molecular Nanostructures

O 59.2: Talk

Thursday, February 28, 2008, 09:45–10:00, MA 041

Structural coherency of graphene on Ir(111) — •Coraux Johann, N’Diaye Alpha, Busse Carsten, and Michely Thomas — University of Cologne - Institute of Physics 2, Zuelpicher Str. 77, 50937 Cologne, Germany

We investigate the high structural quality of monolayers of graphene prepared on Ir(111). Using scanning tunneling microscopy, we show that graphene prepared this way exhibits remarkably large-scale continuity of its carbon rows over terraces and step edges. The graphene layer contains only a very low density of defects. These are zero-dimensional defects, edge dislocation cores consisting of heptagon-pentagon pairs of carbon atom rings, which we relate to small-angle in-plane tilt boundaries in the graphene. We quantitatively examined the bending of graphene across Ir step edges. The corresponding radius of curvature compares to those of thin single-wall carbon nanotubes.
J. Coraux, A. T. N’Diaye, C. Busse, T. Michely, submitted.