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Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 30: POSTER: Chemical physics

CPP 30.33: Poster

Tuesday, March 8, 2005, 16:30–18:30, Poster TU D

A TEM and XANES study of vanadium oxide nanotubes — •A. Gloskovskii1, S. A. Nepijko1, G. Schönhense1, A. Reiber2, H. A. Therese2, G. H. Fecher2, H. C. Kandpal2, C. Felser2, W. Tremel2, and M. Klimiankou31Institut für Physik, Johannes Gutenberg - Universität, 55099 Mainz — 2Institut für Anorganische und Analytische Chemie, Johannes Gutenberg - Universität, 55099 Mainz — 3Institut für Materialforschung I, Forschungszentrum Karlsruhe GmbH, 76021 Karlsruhe

The vanadium oxide nanotubes used in this study were synthesized using the sol-gel technique following the procedure reported by Krumeich et al. [1]. TEM studies of vanadium oxide nanotubes show that the samples consist of multi-walled nanotubes with inner diameters in the range of 20-40 nm, and a length of typically several µ m (it can even reach tens of µ m). Spectroscopic measurements were performed to understand the electronic state of vanadium in relation to bulk material. The EDX and EELS measurements revealed that the chemical formula of the nanotubes is V2O5. Comparison of XAS measurements taken from nanotubes and bulk V2O5 revealed an overall similarity but also significant differences in details between their spectra. The latter can be explained by a major contribution of the surface to the electronic structure and electronic transitions of V2O5 nanotubes in comparison to bulk material. Band structures for both bulk and slab V2O5 were calculated by LMTO and FLAPW methods showing a good agreement with the experiment.

(This work is funded by the DFG in SFB 625 TP9.)

[1] F. Krumeich et al.; J. Am. Chem. Soc. 121, (1999) 8324

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