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Effect of a Bubble Gas on the Formation of Self-Organized Pore Arrays in Anodic Aluminum Oxide
VanChiem Chu,Huiting Li,김희동,서재명 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6
Based on different morphologies of both sides of an anodic aluminum oxide (AAO) membrane detached from an Al substrate, we proposed that the bubble gas generated at the interface between the Al substrate and an aqueous solution plays a critical role in forming self-organized hexagonal pore arrays in anodic alumina. Such a proposal not only successfully explains the experimental observation that hexagonal pore arrays are ordered better on a flatter substrate at the initial stage of oxidation but also corrects the previously proposed `continuous model,' putting emphasis on the surface depression for pore initiation and predicting ordered hemispherical pore tips at the interface between the AAO and the Al substrate.