Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Nanostructure at Surfaces: Dots and Clusters
O 82.5: Vortrag
Donnerstag, 19. März 2015, 11:30–11:45, MA 043
Structure of graphene/Ir(111) supported Pt/Rh clusters — •Dirk Franz1,2, Nils Blanc3,4,5, Johann Coraux3,4, Heshmat Noei2, Roman Shayduk2, and Andreas Stierle1,2 — 1Universität Hamburg, D-20355 Hamburg, Germany — 2DESY NanoLab, D-22607 Hamburg, Germany — 3Université Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France — 4CNRS, Inst NEEL, F-38042 Grenoble, France — 5CEA-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, XRR, GISAXS, XPS) to investigate the structure and composition of Pt/Rh particles (shape, epitaxy, strain) with less than 50 atoms grown on a graphene/Ir(111) support. SXRD and GISAXS essentially benefit from the ordered arrangement of the clusters and are able to reveal the average atomic structure of these small clusters [2].
[1] A. T. N'Diaye, et al., New J. Phys. 11, 103045 (2009).
[2] D. Franz, et al., Phys. Rev. Lett. 110, 065503 (2013).