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Nanoscale Res Lett. 2012 Aug 23;7(1):474.

Effect of the anodization voltage on the pore-widening rate of nanoporous anodic alumina.

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1
LPICM, Ecole Polytechnique, CNRS, Palaiseau, 91128, France. enric.garcia-caurel@polytechnique.edu.

Abstract

A detailed study of the pore-widening rate of nanoporous anodic alumina layers as a function of the anodization voltage was carried out. The study focuses on samples produced under the same electrolyte and concentration but different anodization voltages within the self-ordering regime. By means of ellipsometry-based optical characterization, it is shown that in the pore-widening process, the porosity increases at a faster rate for lower anodization voltages. This opens the possibility of obtaining three-dimensional nanostructured nanoporous anodic alumina with controlled thickness and refractive index of each layer, and with a refractive index difference of up to 0.24 between layers, for samples produced with oxalic acid electrolytes.

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