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Open Access Nano Express

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

Mohammad Mahbubur Rahman1, Enric Garcia-Caurel2*, Abel Santos1, Lluis F Marsal1, Josep Pallarès1 and Josep Ferré-Borrull1

Author affiliations

1 Nano-electronic and Photonic Systems (NePhoS), Universitat Rovira i Virgili, Avinguda Paisos Catalans 26, Tarragona, 43007, Spain

2 LPICM, Ecole Polytechnique, CNRS, Palaiseau, 91128, France

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Citation and License

Nanoscale Research Letters 2012, 7:474  doi:10.1186/1556-276X-7-474

Published: 23 August 2012

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.

Keywords:
Anodization voltage; Alumina; Nanostructures; Nanoporous anodic alumina; Ellipsometry