Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 62: Graphene III
O 62.6: Vortrag
Donnerstag, 25. März 2010, 11:45–12:00, H31
Nucleation and growth of nickel and cobalt nanoclusters on graphene Moiré on Rh(111) — •Muriel Sicot1, Samuel Bouvron1, Ole Zander1, Mikhail Fonin1, Ulrich Rüdiger1, and Yuriy. S. Dedkov2 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 2Fritz-Haber-Institut der Max-Planck Gesellschaft, 14195 Berlin, Germany
The development of advanced routes to fabricate highly-ordered monodispersed metallic nanostructures is one of the key challenges in nanotechnology. One of the promising ways to produce arrays of monodispersed nanoclusters (NCs) is to use a bottom-up approach where self-organization growth phenomena on template substrates are used. In this work, we use a graphene Moiré grown on Rh(111) as a template. The possibility to create arrays of magnetic clusters on this graphene Moiré is investigated by means of scanning tunneling microscopy. Regularly sized Ni and Co NCs have been grown. We determine that the initial growth of Co and Ni at 150 K leads to preferential nucleation of monodispersed NCs at specific sites of the Moiré superstructure. The NCs exhibit a typical diameter of about 3 nm and are 4 monolayers high. However, a defined long-range ordering of NCs with increasing coverage is not observed. These results suggest that the graphene nanomesh on Rh(111) is suitable for the growth of low density superlattices only. Room temperature growth of Co shows the same behaviour than at 150 K whereas Ni forms large triangular-shaped nanoislands which are well-matched to the Moiré registry. This work was supported by DFG through SFB 767 (TP C5).