Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 56: Poster Wednesday: Nanostructures 2

O 56.1: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Pt Wedge on h-BN/Rh(111): Structural Analysis by HR-XPS — •Natalie J. Waleska, Fabian Düll, Florian Späth, Udo Bauer, Philipp Bachmann, Johann Steinhauer, and Christian Papp — Friedrich-Alexander-Universität, Erlangen, Germany

An approach to overcome the material gap to commercial catalysts is the investigation of metal nanoclusters on 2D materials (e.g. h-BN). To date, mostly 3D metal clusters with a narrow size distribution on such support materials were studied. However, the clusters' structure and thus the available adsorption sites, as well as the catalytic activity varies strongly from 3D to monolayer clusters or even single atoms.

To investigate the structural differences of clusters with varying sizes, a Pt wedge was prepared in a single preparation step on the h-BN/Rh(111) substrate, ranging from 0.21 to 0.001 ML Pt coverage. The analysis was performed using HR-XPS and CO as a probe molecule. From the data, we were able to determine the transition from monolayer to 3D cluster formation for the as-prepared Pt wedge. Upon heating to 550 K, structural changes of the Pt clusters were observed as a result of cluster ripening and sintering.

We thank Helmholtz-Zentrum Berlin for allocation of synchrotron-radiation beamtime and BESSY II staff for support during beamtime. This work was funded by the DFG within SFB 953 "Synthetic Carbon Allotropes" (Project #182849149).