  Atomic models of quasi-one-dimensional 1D vanadium oxide nanostructures -
nanotubes of various morphology (cylinder or scroll-like) formed by rolling
(010) single layers of V2O5 are constructed and their electronic properties are
studied using the tight-binding band theory. Compared to the cylindrical zigzag
(n,0) and armchair (n,n)-like nanotubes, which are uniformly semi-conducting
with the bang gap of about 2.5-2.7 eV, the band gap of the scroll-like tubes
trends significantly to vanish (up to about 0.1 eV) depending on the atomic
configurations of the tubes and inter-wall distances.
