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Diffusion-Controlled Growth Model for Electrodeposited Cobalt Nanowires in Highly Ordered Aluminum Oxide Membrane
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2010
Year
Electrodeposited Cobalt NanowiresEngineeringNanoporous MaterialChemistryChemical EngineeringCobalt NanowiresDiffusion-controlled Growth ModelNanostructure SynthesisMaterials ScienceNanotechnologyOxide ElectronicsSurface ElectrochemistryMetallic NanowiresElectrochemical CellElectrochemical ProcessElectrochemistryNanomaterialsApplied PhysicsCo NanowiresElectrochemical Surface Science
This work studies the electrochemical growth behavior of cobalt nanowires in highly ordered aluminum oxide membrane. Considering the electrodeposition of metallic nanowires, cation concentration profile in each nano pore was calculated. With assumption of linear diffusion zone on the growing surface of nanowires, a modified Cottrell equation was evaluated. To confirm the model, the Co nanowires were electrodeposited into porous anodic aluminum oxide (AAO) templates and the mechanism of deposition was studied. Comparing the results of model and the experiments has proved the accuracy of the model. Also, it was observed that the growth of the Co nanowires was controlled mainly by diffusion process. With these considerations, the diffusion coefficient of the Co2+ cation in pore was determined about D = 2.14×10-5 cm2.s-1. SEM and TEM analysis showed high density and uniform nanowires that retained the shape of pores.