Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Nanostructures at Surfaces: Graphene and Other Aspects
O 82.7: Vortrag
Mittwoch, 22. März 2017, 17:30–17:45, REC/PHY C213
Atomic structure and element distribution of graphene/Ir(111) supported Pt/Rh metal clusters — •Dirk Franz1,2, Nils Blanc3,4, Johann Coraux4, Heshmat Noei2, Roman Shayduk2, and Andreas Stierle1,2 — 1Universität Hamburg, D-20355 Hamburg, Germany — 2DESY NanoLab, D-22607 Hamburg, Germany — 3Institut NEEL, CNRS, F-38042 Grenoble, France — 4CEA-UJF, INAC, F-38054 Grenoble, France
Ultrasmall metallic nanoparticles exhibit altered structural, chemical and magnetic properties as compared to their bulk counterparts making them attractive for applications as highly active heterogeneous catalysts or high storage density magnetic media. To pinpoint structure-functionality relationships for systems containing nanoparticles with diameters smaller than 2 nm an atomic scale understanding of their structure is mandatory.
It was previously shown that different 2D metal cluster arrays can be grown using the moiré of graphene/Ir(111) as a template [1]. We have employed several surface sensitive techniques (SXRD, GISAXS, XPS) to investigate the structure of Pt/Rh particles (shape, epitaxy, strain, element distribution) with less than 50 atoms after growth on a graphene/Ir(111) support and in oxidizing/reducing gas environments. SXRD and GISAXS benefits essential from the ordered arrangement of the clusters and is able to reveal the average atomic structure of these small clusters.
[5] A. T. N’Diaye, et al., New J. Phys. 11, 103045 (2009).
[6] D. Franz, et al., Phys. Rev. Lett. 110, 065503 (2013).