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Title: Nucleation and growth of cobalt nanostructures on highly oriented pyrolytic graphite
Authors: Poon, S.W. 
Pan, J.S.
Tok, E.S. 
Issue Date: 2006
Citation: Poon, S.W., Pan, J.S., Tok, E.S. (2006). Nucleation and growth of cobalt nanostructures on highly oriented pyrolytic graphite. Physical Chemistry Chemical Physics 8 (28) : 3326-3334. ScholarBank@NUS Repository.
Abstract: Cobalt in the form of three-dimensional (3D) hemispherical clusters (size ∼10-30 nm) were observed to grow on pristine graphite surfaces via a Volmer-Weber growth mode. X-Ray photoelectron spectroscopy (XPS) reveals that these clusters are physisorbed on the surface. In the presence of minute surface contamination, the morphology of Co changes into a mixture of irregular and hemispherical three-dimensional islands. The formation of irregular islands appears to be mediated by the chemical interactions between Co and the surface contaminants as evidenced from analysis of the carbon π-π* transitions. Further analysis of size distribution of Co nanoclusters grown on pristine surfaces shows a critical nucleus size of i* = 1, i.e. a Co dimer forms the smallest stable cluster on a pristine graphite surface. © the Owner Societies 2006.
Source Title: Physical Chemistry Chemical Physics
ISSN: 14639076
DOI: 10.1039/b604627b
Appears in Collections:Staff Publications

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