ResearchSpace

From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons

Show simple item record

dc.contributor.author Mwakikunga, Bonex W
dc.contributor.author Maaza, M
dc.contributor.author Hillie, KT
dc.contributor.author Arendse, CJ
dc.contributor.author Malwela, T
dc.contributor.author Sideras-Haddadf, E
dc.date.accessioned 2012-06-14T11:49:47Z
dc.date.available 2012-06-14T11:49:47Z
dc.date.issued 2012-07
dc.identifier.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 en_US
dc.identifier.issn 0924-2031
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0924203112000513
dc.identifier.uri http://hdl.handle.net/10204/5910
dc.identifier.uri https://doi.org/10.1016/j.vibspec.2012.02.007
dc.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 en_US
dc.description.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. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Workflow;8992
dc.subject Vanadium oxides en_US
dc.subject Phonon confinement en_US
dc.subject Phonon splitting en_US
dc.subject Cations en_US
dc.subject Stoichiometry en_US
dc.title From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons en_US
dc.type Article en_US
dc.identifier.apacitation Mwakikunga, B. W., Maaza, M., Hillie, K., Arendse, C., Malwela, T., & Sideras-Haddadf, E. (2012). From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons. http://hdl.handle.net/10204/5910 en_ZA
dc.identifier.chicagocitation Mwakikunga, Bonex W, M Maaza, KT Hillie, CJ Arendse, T Malwela, and E Sideras-Haddadf "From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons." (2012) http://hdl.handle.net/10204/5910 en_ZA
dc.identifier.vancouvercitation Mwakikunga BW, Maaza M, Hillie K, Arendse C, Malwela T, Sideras-Haddadf E. From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons. 2012; http://hdl.handle.net/10204/5910. en_ZA
dc.identifier.ris TY - Article AU - Mwakikunga, Bonex W AU - Maaza, M AU - Hillie, KT AU - Arendse, CJ AU - Malwela, T AU - Sideras-Haddadf, E AB - 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. DA - 2012-07 DB - ResearchSpace DP - CSIR KW - Vanadium oxides KW - Phonon confinement KW - Phonon splitting KW - Cations KW - Stoichiometry LK - https://researchspace.csir.co.za PY - 2012 SM - 0924-2031 T1 - From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons TI - From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons UR - http://hdl.handle.net/10204/5910 ER - en_ZA


Files in this item

Thumbnail
Name: Mwakikunga1_2012.pdf
Size: 1.083Mb
Format: PDF
View/Open

This item appears in the following Collection(s)

Show simple item record