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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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gohappy: ½ð±Ò+1 2012-04-22 07:21:44
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