Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 75: Fundamentals of Catalysis I

O 75.9: Vortrag

Donnerstag, 4. April 2019, 12:45–13:00, H5

Coverage and temperature dependent size and distribution variations of entrapped Pt-nanoclusters on h-BN/Rh(111) — •Manuel Meusel, Fabian Düll, Simon Schötz, Florian Späth, Udo Bauer, Philipp Bachmann, Johan Steinhauer, Hans-Peter Steinrück, Andreas Bayer, and Christian Papp — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany

UHV methods provide a powerful tool to investigate surfaces down to the atomic level. However, a large material gap exists between highly defined single crystalline surfaces under UHV conditions and real life materials. One route to bridge this material gap are, at first, more complex surfaces with steps, followed by nanoclusters with mainly edges and corners. By using the Moiré pattern of hexagonal boron-nitride (h-BN) on Rh(111), it is possible to prepare highly defined arrays of separated metal nanoclusters. These systems are promising candidates as model systems for the complex surfaces of heterogeneous catalysts, while still being accessible to investigations via surface science methods. Therefore, the controlled fabrication and understanding of such systems is crucial. We conducted STM and XPS investigations on the coverage- and temperature-dependence of distribution and size of the Pt nanoclusters in the h BN/Rh(111) nanomesh at sub-monolayer coverages. Above 0.1 ML of Pt, we observe well-ordered nanoclusters with a uniform shape. Below this coverage, an inhomogeneous appearance suggests the presence of smaller, more mobile clusters. Further, we discuss the temperature-dependent sintering behaviour.