Fabrication and Characterization of Highly Ordered Porous Alumina Templates by a Two-Step Anodization Process

Abstract:

Highly ordered through-hole anodic porous alumina membranes were fabricated by electrochemical oxidation of aluminum in a controlled two-step process. A teflon dispositive was used to ensure single side anodization. Under the most appropriate condition for the fabrication of ideally ordered anodic aluminum oxide (AAO), the voltage used was 15 V during 24 h in a 15 % w/v sulfuric acid solution. SEM, TEM and FESEM characterization shows that the as-fabricated AAO film has a defect-free array of straight parallel channels perpendicular to the surface. The thickness of the porous membrane is 20 microns, approximately. The ordered channels are formed in a honey comb arrange with a pore diameter in the range 20-30 nm, wall thickness of 10-20 nm, interpore distance of 40 nm, and high aspect ratio of 850. The pore density, quantified by image analysis, is 5.4×10¹⁰ pore/cm²; perfect ordering was maintained in the full depth of the membrane. Dimensions of this porous structure provide a convenient way to precision engineer the nanoscale morphology.

• Periodical: Materials Science Forum (Volume 755)
• Pages: 75-81
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.755.75
• Online since: April 2013
• Authors: C.A. León-Patiño, E.A. Aguilar-Reyes, C. Ruiz-Aguilar
• Keywords: Anodic Alumina, Anodization, Auto-Ordered Structure, Nanopore, Porous templates

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