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Vanadate conformation variations in vanadium pentoxide nanostructures
O'Dwyer, Colm; Lavayen, Vladimir; Newcomb, Simon B.; Santa-Ana, María A.; Benavente, Eglantina; Gonzalez, Guillermo; Sotomayor Torres, Clivia M.
We report the comparative structural-vibrational study of nanostructures of nanourchins, nanotubes, and nanorods of vanadium oxide. The tube walls comprise layers of vanadium oxide with the organic surfactant intercalated between atomic layers. Both Raman scattering and infrared spectroscopies showed that the structure of nanourchins, nanotubes, and nanorods of vanadium oxide nanocomposite are strongly dependent on the valency of the vanadium, its associated interactions with the organic surfactant template, and on the packing mechanism and arrangement of the surfactant between vanadate layers. Accurate assignment of the vibrational modes to the V-O coordinations has allowed their comparative classification and relation to atomic layer structure. Although all structures are formed from the same precursor, differences in vanadate conformations due to the hydrothermal treatment and surfactant type result in variable degrees of crystalline order in the final nanostructure. The nanotube-containing nanourchins contain vanadate layers in the nanotubes that are in a distorted γ- V5+ conformation, whereas the the nanorods, by comparison, show evidence for V5+ and V4+ species-containing ordered VOx lamina.
Keyword(s): Vanadium compounds; Nanotubes; Nanocomposites; Raman spectra; Organic compounds; Surfactants; Infrared spectra; Intercalation compounds; Phonons
Publication Date:
2007
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University College Cork
Funder(s): Science Foundation Ireland
Citation(s): O'Dwyer, C., Lavayen, V., Newcomb, S. B., Santa Ana, M. A., Benavente, E., Gonzalez, G., and Sotomayor Torres, M. A. (2007) 'Vanadate conformation variations in vanadium pentoxide nanostructures'. Journal of the Electrochemical Society, 154(8), pp. K29-K35. http://jes.ecsdl.org/content/154/8/K29.abstract
Publisher(s): Electrochemical Society
File Format(s): application/pdf
First Indexed: 2016-07-13 05:37:24 Last Updated: 2016-10-14 06:29:53