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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.104: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
Preparation and investigation of graphene on Rh(111) — •Ole Zander1, Mikhail Fonin1, Sönke Voss1, Ulrich Rüdiger1, and Yuri S. Dedkov2 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
Graphene, a flat monolayer of carbon atoms packed in a honeycomb-lattice, exhibits exceptional electronic properties chracteristic for twodimensional Dirac fermions. There are three major ways of graphene preparation: exfoliation of graphite, thermal decomposition (graphitization) of SiC and low pressure chemical vapor deposition (CVD) on noble metals. The latter method is the most promising route for large-scale graphene preparation yielding excellent film qualities with low defect densities over large length scales. Depending on the metallic substrate, graphene grows completely flat or corrugated.
By using CVD we succeeded in growing a monolayer of graphite on Rh(111). High resolution scanning tunneling microscopy (STM) imaging revealed a corrugated graphene superstructure of about 30 Å periodicity. Depending on the preparation conditions we observed either a mixture of several superstructures occurring at lower preparation temperatures with periodicities from 11 Å up to 30 Å, or a single phase, the 30 Å moiré-pattern, at higher temperatures. Moreover, we successfully used grapehen nanomesh on Rh(111) as a template for the growth of highly-ordered d-metal cluster arrays as suggested in [1].
[1] N'Diaye et al., Phys. Rev. Lett. 97, 215501 (2006).