Fig. 1. The procedure of electrochemical anodization technique: (a) Aluminum, (b) 1st Anodization step, (c) Chemical etching for anodic oxide removal, (d) 2nd Anodization step.
Fig. 2. FE-SEM of surface morphology and thickness of the aluminum oxide prepared by modulating 1st anodization voltage for 30 min at (a, b) 100 V, (c, d) 120 V.
Fig. 3. Variation of pore thickness according to 1st anodization time for 30 min at 100 and 120 V.
Fig. 4. FE-SEM of surface morphology after chemical etching (AAO removal step) at (a, b) 100 V, (c, d) 120 V.
Fig. 5. FE-SEM of surface morphology and thickness of the aluminum oxide prepared by modulating 2nd anodization voltage for 20 min at (a, b) 100 V and (c, d) 120 V.
Fig. 6. Variation of pore thickness according to 2nd anodization time for 20 min at 100 and 120 V.
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