Title |
Effect of the anodization voltage on the pore-widening rate of nanoporous anodic alumina
|
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Published in |
Discover Nano, August 2012
|
DOI | 10.1186/1556-276x-7-474 |
Pubmed ID | |
Authors |
Mohammad Mahbubur Rahman, Enric Garcia-Caurel, Abel Santos, Lluis F Marsal, Josep Pallarès, Josep Ferré-Borrull |
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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