| Abstract
| - Microscale hollow spherical architectures consisting of closely packed and radially well-aligned Zn2SiO4nanowires (NWs) with and without ZnO spherical nanocrust have been achieved on Si wafers through asimple thermal evaporation and condensation process by using a mixture of any of three carbonates (ZnCO3·2Zn(OH)2·H2O, (MgCO3)4·Mg(OH)2·5H2O, and MnCO3) and graphite at the bottom and a layer of zinc powderon top as source materials. The major hollow spherical architectures consist of closely packed and well-aligned Zn2SiO4 NWs growing radially inward from the inner surface of ZnO outer nanocrust. The minorones are composed of oriented Zn2SiO4 NWs growing radially outward, with the NW tips forming numerousarchitectures looking like Chinese writing brush heads. The ZnO outer nanocrust has a strong UV emissionat about 390 nm and a green one at about 510 nm, while the well-aligned Zn2SiO4 NWs have a broad greenemission centered at about 520 nm. The novel hollow spherical architectures may have potentials in futurenanotechnology.
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