Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 61: Nanostructures at Surfaces III
O 61.6: Talk
Wednesday, April 2, 2014, 17:15–17:30, WIL B321
Structure of graphene/Ir(111) supported metal clusters — •Dirk Franz1,2, Timm Gerber3, Carsten Busse3, Thomas Michely3, Nils Blanc4,5, Johann Coraux4, Uta Hejral1,2, Roman Shayduk1, and Andreas Stierle1,2 — 1Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany — 2Fachbereich Physik, Universität Hamburg, D-20355 Hamburg, Germany — 3II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln — 4Institut NEEL, CNRS and Universite Joseph Fourier, BP166, F-38042 Grenoble Cedex 9, France — 5CEA-UJF, INAC, SP2M, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
It was previously shown that different 2d metal cluster arrays can been grown using the moire of graphene/Ir(111) as a template [1].
We have employed several surface sensitive techniques (SXRD, XRR, GISAXS, HEXRD, STM) to investigate the structure of the particles (shape, epitaxy, strain) and the coherence of the 2d lattice. SXRD and GISAXS analysis benefits substantial from the regular arrangement of the particles and has the potential to be a possible standard technique to solve the atomic structure of ordered cluster arrays.
In particular we investigated the structure of Ir clusters in ultra high vacuum [2], Pt cluster in CO environment and alloy clusters with sequential deposition and co-deposition of Pt/Rh. A shape change of Pt/Rh clusters in an oxidizing environment has been observed.
[1] N'Diaye et al. in: Phys. Rev. Lett. 97, 215501 (2006)
[2] Franz et al. in: Phys. Rev. Lett. 110, 065503 (2013)