SnO
2 nanostructures with cactus-like morphology were synthesized by thermal evaporation of Sn powder. Any catalyst and substrate were not used for the formation of SnO
2 nanostructures. X-ray diffraction result showed that the SnO
2 nanostructures had rutile crystallographic structure. Scanning electron microscopy study revealed that the cactus-like SnO
2 nanostructure consisted of main microrod stem and many branched nanowires. The secondary growth of SnO
2 nanowire branches occurred on the primary main SnO
2 microrods. Vapor–solid growth mechanism was proposed for the growth of the SnO
2 nanostructures because no catalytic particles were found at the tips of the nanowires. A strong visible emission peak at 530 nm was observed in the cathodoluminescence spectrum taken from the cactus-like SnO
2 nanostructures at room temperature.
抄録全体を表示