Fabrication of highly ordered porous anodic alumina membrane with ultra-large pore intervals in ethylene glycol-modified citric acid solution

Fabrication of anodic alumina membrane with ultra-large pore intervals is still a challenge because it is difficult to maintain stable anodization without breakdown or burning of the alumina due to the corrosive acid attack at high electric fields. A novel strategy is proposed that the undesired burning phenomena of the alumina can be avoided at relatively high voltage anodization in ethylene glycol-modified citric acid solution at room temperature, and an ultra-large pore interval up to 1,800 nm was achieved at 700 V. A large pore of 800 nm was readily obtained by chemical etching of the alumina pore wall in 5.0 wt% H3PO4 solution.

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