Preparation of the very uniform pore diameter of anodic alumina oxidation by voltage compensation mode

●Tapered pores were demonstrated in the traditional AAO template.●Ion exchange rate decrease and corrosion by electrolyte in AAO preparation.●We adopted a voltage compensation mode to prepare very uniform pores.

In this paper, we adopted a voltage compensation mode and prepared a porous anodic alumina oxidation template with very uniform pore diameter even when the pore length reaches to 60 μm. This compensation voltage mode can effectively compensate the uneveness of the pore size caused by ion concentration decrease at the bottom of the pores directly involved in the anodic oxidation in the continuously growing process of holes, and the chemical corrosion effect of the pre-formed hole by electrolyte. This very uniform pore diameter alumina oxidation template will be helpful for further studies on the properties related to diameter of nanowires.