Resumo

RIVERA-FLORES, B. L. et al. Growth of polyhedral stacked micro columns and micro particles of zinc by thermal evaporation and condensation technique. Superf. vacío [online]. 2014, vol.27, n.3, pp.82-87. ISSN 1665-3521.

Metallic zinc nano structures have been grown by the thermal evaporation and condensation technique using a mixture of zinc and manganese oxide powders and nitrogen as carrier gas. 650 °C and 1 atm were used as processing temperature and pressure, respectively. It was found that the shape of zinc structures is dependent on the source materials. When a mixture of Zn/MnO₂ powders is used as raw material micro-particles with oblate spherical shape and micro-columns are obtained. On the other hand, when only zinc powder is used as source material, spherical stones without facets are deposited. It is assumed that evaporation from the source is inhibited when a mixture of Zn and MnO₂ is used. Therefore, supersaturation downstream from the source changes and as a consequence the morphology of the structures is modified. Synthesized material is make-up of zinc atoms and no other impurities or catalytic particles were detected according to elemental analysis. Vapor-solid is though as mechanism for growing those zinc structures.

Palavras-chave : Zinc microstructures; Evaporation-Condensation Technique; Hexagonal Zinc.