Preparation and Formation Mechanism of Al_2O_3 Nanowires by Electrochemical Oxidation Process

Al_2O_3 nanowires were prepared with the method of electrochemical oxidation followed by acid corrosion. The morphology and structure of Al_2O_3 nanowires were characterized by SEM,EDS and IR.The experimental results show that Al_2O_3 nanowires with hexagonal arrangement and large aspect ratio are formed from Al_2O_3 porous film by electro-oxidation of aluminum substrate.The diameter of the pure Al_2O_3 nanowires is from 16nm to 60nm,and decreases with the rising of electrolyte temperature,cell voltage and the prolonging of corrosion time.On the basis of characterization of nanowires on Al_2O_3 porous film,a possible formation mechanism was proposed.