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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. Vapor­solid 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. [doi:10.2320/matertrans.M2013240]

Cactus-Like SnO<sub>2</sub> Nanostructures Grown by Thermal Evaporation Technique