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

Gerber, Timm ; Knudsen, Jan LU ; Feibelman, Peter J. ; Grånäs, Elin LU ; Stratmann, Patrick ; Schulte, Karina LU ; Andersen, Jesper N LU and Michely, Thomas (2013) In ACS Nano 7(3). p.2020-2031
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
graphene, cluster, Smoluchowski ripening, sintering, carbon monoxide, diffusion, adsorption
in
ACS Nano
volume
7
issue
3
pages
2020 - 2031
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000316846700018
  • scopus:84875638999
  • pmid:23379255
ISSN
1936-086X
DOI
10.1021/nn400082w
language
English
LU publication?
yes
id
c3c7c375-a7e9-4963-8487-436d8684fe01 (old id 3749130)
date added to LUP
2016-04-01 09:48:13
date last changed
2020-01-07 01:00:26
@article{c3c7c375-a7e9-4963-8487-436d8684fe01,
  abstract     = {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.},
  author       = {Gerber, Timm and Knudsen, Jan and Feibelman, Peter J. and Grånäs, Elin and Stratmann, Patrick and Schulte, Karina and Andersen, Jesper N and Michely, Thomas},
  issn         = {1936-086X},
  language     = {eng},
  number       = {3},
  pages        = {2020--2031},
  publisher    = {The American Chemical Society (ACS)},
  series       = {ACS Nano},
  title        = {CO-Induced Smoluchowski Ripening of Pt Cluster Arrays on the Graphene/Ir(111) Moire},
  url          = {http://dx.doi.org/10.1021/nn400082w},
  doi          = {10.1021/nn400082w},
  volume       = {7},
  year         = {2013},
}