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|Title:||Nucleation and growth of cobalt nanostructures on highly oriented pyrolytic graphite||Authors:||Poon, S.W.
|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. https://doi.org/10.1039/b604627b||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||URI:||http://scholarbank.nus.edu.sg/handle/10635/97388||ISSN:||14639076||DOI:||10.1039/b604627b|
|Appears in Collections:||Staff Publications|
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