Various pore sizes of anodic aluminum oxide (AAO) were fabricated using a two-step anodization process. AAO pores with diameters ranging from 5 to 500 nm were formed in diluted electrolyte solutions of sulfuric acid, oxalic acid, and phosphoric acid. Irregularly shaped tin particles in nano sizes were formed on the AAO using a thermo-vaporizing process. Tin spheres with diameters ranging from 3 to 500 nm were then obtained by reflowing vaporized AAO in silicate oil. A transmission electron microscope (TEM JEOL 2000) was employed to characterize the crystalline structure of a tin sphere with 18 nm diameter.
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