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CO-Induced Smoluchowski Ripening of Pt Cluster Arrays on the Graphene/Ir(111) Moire

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Author

Summary, in English

Regular Pt cluster arrays grown on the moire template formed by graphene on Ir(111) were tested for their stability with respect to CO gas exposure. Cluster stability and adsorption-Induced processes were analyzed as a function of cluster size, with In situ scanning tunneling microscopy and X-ray photoelectron spectroscopy. Small clusters containing fewer than 10 atoms were unstable upon CO adsorption. They sintered through Smoluchowski ripening-cluster diffusion and coalescence rather than the frequently reported Ostwald ripening mediated by metal-adsorbate complexes. Larger dusters remained immobile upon CO adsorption but became more three-dimensional. Careful analysis of the experimental data complemented by ab initio density functional theory calculations provides insight Into the origin of the CO-induced Pt cluster ripening and shape transformations.

Publishing year

2013

Language

English

Pages

2020-2031

Publication/Series

ACS Nano

Volume

7

Issue

3

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Nano Technology

Keywords

  • graphene
  • cluster
  • Smoluchowski ripening
  • sintering
  • carbon monoxide
  • diffusion
  • adsorption

Status

Published

ISBN/ISSN/Other

  • ISSN: 1936-086X