A Novel Method for Fabricating Double Layers Porous Anodic Alumina in Phosphoric/Oxalic Acid Solution and Oxalic Acid Solution

Figure 1

(a) Top and (b) bottom FE-SEM images of PAA fabricated in 1 wt% H₃PO₄ electrolyte at 170 V; (c) top and (d) bottom FE-SEM images of PAA fabricated in 1 wt% H₃PO₄/0.03 M H₂C₂O₄ at 195 V.

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