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

Jen-Yi Fan1, Ming-Chun Chien2 and Gou-Jen Wang1*

Author Affiliations

1 Department of Mechanical Engineering, National Chung-Hsing University, Taichung, 40227, Taiwan

2 Department of Electronic Engineering, Chung Chou Institute of Technology, Yuan-lin, 510, Taiwan

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Nanoscale Research Letters 2006, 2:49-53  doi:10.1007/s11671-006-9029-1

The electronic version of this article is the complete one and can be found online at:

Received:4 August 2006
Accepted:23 October 2006
Published:28 November 2006

© 2006 to the authors


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

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

Nano Express



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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