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Issue 38, 2019
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Growth and stability of Pt nanoclusters from 1 to 50 atoms on h-BN/Rh(111)

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Abstract

The h-BN nanomesh on Rh(111) is used as eggbox-like template for the formation of arrays of Pt nanoclusters with a narrow size distribution. Nanoclusters with sizes from 1 up to 50 atoms are prepared simultaneously in a wedge-like structure by depositing a coverage gradient on the h-BN nanomesh, and thus can be investigated under identical conditions. We studied the preparation and properties of these Pt nanoclusters of different size in situ by high-resolution X-ray photoelectron spectroscopy and scanning tunneling microscopy. For a Pt coverage of 0.1 ML, all pores of the h-BN nanomesh are filled with nanoclusters with a remarkably uniform cluster size of ≈12 Pt atoms per pore, and high stability up to 400 K. Above 0.2 ML Pt, the clusters are less stable. The coverage dependent analysis shows that for Pt coverages below 0.1 ML, the number of nanoclusters is smaller – and the number of empty pores higher – than expected for a simple hit and stick mechanism. We assign this behavior to an initially higher mobility of the Pt atoms in a hot precursor state.

Graphical abstract: Growth and stability of Pt nanoclusters from 1 to 50 atoms on h-BN/Rh(111)

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Publication details

The article was received on 22 Jul 2019, accepted on 16 Sep 2019 and first published on 16 Sep 2019


Article type: Paper
DOI: 10.1039/C9CP04095A
Phys. Chem. Chem. Phys., 2019,21, 21287-21295

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    Growth and stability of Pt nanoclusters from 1 to 50 atoms on h-BN/Rh(111)

    F. Düll, M. Meusel, F. Späth, S. Schötz, U. Bauer, P. Bachmann, J. Steinhauer, H. Steinrück, A. Bayer and C. Papp, Phys. Chem. Chem. Phys., 2019, 21, 21287
    DOI: 10.1039/C9CP04095A

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