We made a nano-porous alumina membrane by anodization under 40 V by two steps (10 minutes and 120 minutes) in oxalic acid, followed by chemical treatment in phosphoric acid assisted by an ultrasonic bath. Thus, we achieved a total relatively short time (3 h 30 min) for the synthesis, having all physicochemical processes been done at room temperature (25 °C). We verified a hexagonal arrangement structure with 56 nm inter-pore diameter, and density of 10 10 pores/cm 2 , characteristic of the self-ordered porous alumina. Therefore, our membranes can be used as a template for fast synthesis of nanostructures as nanowires, nano-tubes.
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