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Experimental investigation on the bi-directional growing mechanism of the foils laminate approach in AAO fabrication


The foils laminate approach can be implemented to grow bi-directional porous pattern from both the top and bottom surfaces of an aluminum foil. It was intuitively inferred that leakage of etchant from the clamped area can be a feasible cause to have the upward pores grow in the notches of the unpolished surface. This leakage hypothesis has been disproved by the leakage blocking and triple layers laminate experiments. It is further inferred that the non-uniformity of the thickness or material properties of the aluminum foil causes non-uniformed anodization rate along the sample surface. The fast oxidized areas create a pathway for leakage such that a shorter porous array from the back side is observed. Experiments with the process time being reduced by two hours validate this inference



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The authors would like to express their gratitude to the reviewers for their valuable comments and suggestions. The authors also would like to thank the National Science Council of Taiwan, for financially supporting this work under Contract No. NSC-94–2212-E-005–010. The Center of Nanoscience and Nanotechnology at National Chung-Hsing University, Taiwan, is appreciated for use of its facilities.

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Correspondence to Gou-Jen Wang.

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Fan, JY., Chien, MC. & Wang, GJ. Experimental investigation on the bi-directional growing mechanism of the foils laminate approach in AAO fabrication. Nanoscale Res Lett 2, 49 (2007).

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  • Anodic aluminum oxide
  • Foils laminate approach
  • Non-uniformed anodization