2013 Volume 54 Issue 11 Pages 2159-2161
SnO2 nanostructures with cactus-like morphology were synthesized by thermal evaporation of Sn powder. Any catalyst and substrate were not used for the formation of SnO2 nanostructures. X-ray diffraction result showed that the SnO2 nanostructures had rutile crystallographic structure. Scanning electron microscopy study revealed that the cactus-like SnO2 nanostructure consisted of main microrod stem and many branched nanowires. The secondary growth of SnO2 nanowire branches occurred on the primary main SnO2 microrods. Vapor–solid growth mechanism was proposed for the growth of the SnO2 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 SnO2 nanostructures at room temperature.