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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5836

Title: Epitaxial deposition of silver ultrafine nano-clusters on defect-free surfaces of HOPG-derived few-layer graphene in a UHV multi-chamber by in-situ STM, ex-situ XPS and ab initio calculations
Authors: Ndlovu, GF
Roos, WD
Wang, ZM
Asante, JKO
Mashapa, MG
Jafta, C
Mwakikunga, BW
Hillie, KT
Keywords: Ag clusters
Silver
Graphene
STM
Issue Date: Mar-2012
Publisher: Springer
Citation: Ndlovu, GF, Roos, WD, Wanf, ZM, Asante, JKO, Mashapa, MG, Jafta, C, Mwakikunga, BW and Hillie, KT. 2012. Epitaxial deposition of silver ultrafine nano-clusters on defect-free surfaces of HOPG-derived few-layer graphene in a UHV multi-chamber by in-situ STM, ex-situ XPS and ab initio calculations. Nanoscale Research Letters, vol. 7:173, DOI: 10.1186/1556-276X-7-173
Series/Report no.: Workflow: 8595
Abstract: The growth of three-dimensional ultra-fine spherical nano-particles of silver on few layers of graphene derived from highly oriented pyrolytic graphite in ultra-high vacuum were characterized using in situ scanning tunneling microscopy (STM) in conjunction with X-ray photoelectron spectroscopy. The energetics of the Ag clusters was determined by DFT simulations. The Ag clusters appeared spherical with size distribution averaging approximately 2 nm in diameter. STM revealed the preferred site for the position of the Ag atom in the C-benzene ring of graphene. Of the three sites, the C-C bridge, the C-hexagon hollow, and the direct top of the C atom, Ag prefers to stay on top of the C atom, contrary to expectation of the hexagon-close packing. Ab initio calculations confirm the lowest potential energy between Ag and the graphene structure to be at the exact site determined from STM imaging.
Description: Copyright: 2012 Ndlovu et al; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
URI: http://rd.springer.com/article/10.1186/1556-276X-7-173
http://hdl.handle.net/10204/5836
ISSN: 1556-276X
1931-7573
Appears in Collections:National Centre for nano-structured materials
Nanotechnology
Open source
General science, engineering & technology
General research interest

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