The effect of voltage and diameter of anodic porous alumina in acid solutions

Anodic aluminum oxide (AAO) is fabricated by electrochemical anodization of aluminum. This work is focused on the optimization on the diameter of the pores in anodic aluminum oxide (AAO) template. The Al sheet (20 × 20 × 0.15 mm) and Al (1 μm) deposited on silicon wafers (p-type) were used for anodic aluminum oxide (AAO) growth. The growing time, temperatures, kinds of electrolyte, working voltage were used to optimize the anodization of alumina. Besides, the effect of working voltage on the diameter of pores was also investigated. The porous array of alumina film has a uniform; closely packs honeycomb structure approximately 15 nm to 150 nm in diameter. Because of this, the structure is a good material for photonic crystal application in the future. This structure of alumina film is observed by scanning electrical microscope (SEM), and the density of porous channels was also obtained (10¹⁰/cm²).