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Journal of Nanomaterials
Volume 2016, Article ID 2978571, 6 pages
http://dx.doi.org/10.1155/2016/2978571
Research Article

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

Yanfang Xu,1 Xiaojiu Li,1,2 Hao Liu,1,2,3 and Jie Xu1

1School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China
2Key Laboratory of Advanced Textile Composite Materials, Ministry of Education of China, Tianjin 300387, China
3Research Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China

Received 20 December 2015; Accepted 28 February 2016

Academic Editor: Zhi Li Xiao

Copyright © 2016 Yanfang Xu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel method for fabricating ordered double layers porous anodic alumina (DL-PAA) with controllable nanopore size was presented. Highly ordered large pore layer with interpore distance of 480 nm was fabricated in phosphoric acid solution with oxalic acid addition at the potential of 195 V and the small pore layer was fabricated in oxalic acid solution at the potential from 60 to 100 V. Experimental results show that the thickness of large pore layer is linearly correlative with anodizing time, and pore diameter is linearly correlative with pore widening time. When the anodizing potential in oxalic acid solution was adjusted from 60 to 100 V, the small pore layers with continuously tunable interpore distance from 142 to 241 nm and pore density from to  cm−2 were obtained. And the interpore distance and the pore density of small pore layers are closely correlative with the anodizing potential. The fabricated DL-PAA templates can be widely utilized for fabrication of ordered nanomaterials, such as superhydrophobic or gecko-inspired adhesive materials and metal or semiconductor nanowires.