Abstract
AAO membranes were detached from Al substrates via an anodic voltage pulse using aqueousHClO4 solution without any organic reagents. Previous studies used a mixture ofHClO4(aq) and 2,3-butanedione or methanol. However, 2,3-butanedione has a strong disagreeableodour, methanol is harmful, and the oxidized products of organic reagents contaminate theAAO template. Eliminating organic reagents makes the detachment process easy and clean,with great potential for the mass fabrication and application of AAO films. The voltageand acidity are critical factors in obtaining open-through AAO films. We propose amechanism for the detachment process, consistent with our experimental results.
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