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要旨:
V(2)O(5) nanotubes synthesized via the sol-gel route has been studied by
electron energy loss spectroscopy (EELS), x-ray absorption spectroscopy
(XAS), and energy dispersive x-ray analysis, in order to understand the
local structure of vanadium in the nanotubes. Contrary to our
expectation, all the features of the XAS and EELS spectra of the
V(2)O(5) nanotubes are in line with that of bulk layered vanadium oxide
revealing that vanadium is present in the 5(+) oxidation state in the
nanotubes. However, V(2)O(5) nanotubes exhibit additional surface states
in their electronic structure in comparison with bulk V(2)O(5). A
comparison of measured and calculated spectra allows us to distinguish
single-wall from multiwall V(2)O(5) nanotubes. (c) 2007 American
Institute of Physics.
