Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)
O 44.29: Poster
Mittwoch, 28. März 2007, 17:00–19:30, Poster C
Kinetics of Ir-cluster lattice formation on a moiré of graphene with Ir(111) — •Tim Plasa1, Alpha T. NDiaye1, Josef Mysliveček2, and Thomas Michely3 — 1I.Physikalisches Institut, RWTH Aachen — 2Institut für Bio- und Nanosysteme IBN-3, Forschungszentrum Jülich — 3II. Physikalisches Institut, Universität Köln
Highly ordered arrays of Ir clusters can be obtained by depositing Ir on Ir(111) surface covered with a graphene monolayer. The periodicity of these arrays is determined by the moire pattern of graphene on Ir(111) [N’Diaye et al., Phys. Rev. Lett. 97, 215501, 2006]. In order to uncover the mechanisms of Ir-cluster lattice formation on a moiré of graphene with Ir(111) we investigated the average cluster size and the occupation probability of moiré cells as a function of coverage, temperature and annealing time. We used a simple kinetic Monte Carlo simulation to derive atomistic parameters of adatom and cluster motion during the lattice formation. Assuming monomer and dimer mobility only, the data for temperatures up to 400 K may be reproduced fairly well, while at higher temperatures or longer annealing time the effect of the mobility of larger clusters become noticable.