Hierarchical single-crystalline β-SiC nanowires were synthesized by simply heating carbonaceous silica xerogel. A fairly high
density of stacking faults was observed perpendicular to  growth direction of the hierarchical nanowires. A possible vapor-solid
growth mechanism for the hierarchical nanowires was discussed. The photoluminescence spectrum of hierarchical SiC nanowires at
room temperature shows two emission peaks at 406 nm and 432 nm. The blue emission at 432 nm may be related to 3C-SiC, while the
emission peak at 406 nm may be attributed to 6H-SiC segments formed by stacking faults in 3C-SiC nanowire matrix.
Keywords: Silicon carbide nanowires, photoluminescence, microstructure, electron microscopy
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