Abstract
Aluminum was anodized in an oxalic acid bath using AC and DC hybrid electrolysis at a frequency of 0.1-1000 Hz and with DC galvanostatic electrolysis. Palladium was electrodeposited as a catalyst into pores of the anodized films using AC potentiostatic electrolysis. Electroplating was prepared continuously on anodized films of aluminum. Then the anodized film was dissolved in 5 mol dm−3 NaOH aqueous solution at room temperature to obtain nickel nanopillar aggregate (about 50-90 nm diameter).Results of SEM evaluation showed that the pore diameter and number (structure) of anodized films were governed by the impressed frequency. The frequency and the pore diameter showed an inverse relation. In addition, nickel nanopillars were prepared from an anodized film template. Results show that the pillar diameter accorded with the pore diameter of the anodized film.
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