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According to a previous theoretical study, the V 3d orbital is
usually located below the analogous d orbitals of the other
transition metals in the energy spectrum and lowers the bottom
conduction band to a more positive position. Accordingly,
vanadium is considered to be an important candidate element as
visible-light photocatalyst.

It has been well-known that low-dimension nanostructures
have unique optical, magnetic, and catalytic properties and are
expected to be elementary units of optoelectronic devices.
The synthesis of low-dimension nanostructures and guiding of
these nanometer-scaled building blocks to ordered superstructures
of complex functional architectures would offer great
opportunities to explore their novel properties and lead to the
construction of nanoscale devices.

The rough surfaces of the hierarchical architecture with increased area and permeability could provide ideal activity sites for photocatalytic reactions. Therefore, the development of facile, template-free, and self-assembly routes for the formation of
hierarchical nanostructures is of great interest.
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