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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5910

Title: From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons
Authors: Mwakikunga, BW
Maaza, M
Hillie, KT
Arendse, CJ
Malwela, T
Sideras-Haddadf, E
Keywords: Vanadium oxides
Phonon confinement
Phonon splitting
Cations
Stoichiometry
Issue Date: Jul-2012
Publisher: Elsevier
Citation: Mwakikunga, BW, Maaza, M, Hillie, KT, Arendse, CJ, Malwela, T and Sideras-Haddadf, E. 2012. From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons. Vibrational Spectroscopy, vol. 61, pp 105-111
Series/Report no.: Workflow;8992
Abstract: Raman spectroscopy of the VOx nano-ribbons is discussed in the framework of the Richter (1981) equation for optical phononconfinement (a) as modified for thin films by Fauchet and Campbell (1986), (b) as presented by Kim and co-workers for slabs, (c) as explained by Eklund's group for surface phonons and (d) our own modification based on the transformation from the spherical coordinates in the Richter equation to Cartesian coordinates; the latter being in keeping with the ribbon geometry. The change of coordinates also influences the profiles of the phonon dispersion curves. Phononsplitting is ascribed to the bi-layer and core–shell geometries of the ribbons and this is used to calculate the ratio of the V5+ to V4+ to the value of 0.54 ± 0.10. This is in perfect agreement with the V5+/V4+ 54.60% from X-ray photo-electron spectroscopy (XPS) measurements.
Description: Copyright: 2012 Elsevier. This is the post-print version of the work. The definitive version is published in Vibrational Spectroscopy, vol. 61, pp 105-111
URI: http://www.sciencedirect.com/science/article/pii/S0924203112000513
http://hdl.handle.net/10204/5910
ISSN: 0924-2031
Appears in Collections:National Centre for nano-structured materials
Nanotechnology
CSIR ScienceScope
CSIR e-News
Analytical science
Sensor science and technology
National building research institute of the CSIR
General science, engineering & technology

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