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Open Access Nano Express

Structural tuning of photoluminescence in nanoporous anodic alumina by hard anodization in oxalic and malonic acids

Abel Santos, Maria Alba, Mahbubur M Rahman, Pilar Formentín, Josep Ferré-Borrull, Josep Pallarès and Lluis F Marsal*

Author affiliations

Departament d’Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avda. Països Catalans 26, Tarragona, 43007, Spain

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Citation and License

Nanoscale Research Letters 2012, 7:228  doi:10.1186/1556-276X-7-228

Published: 19 April 2012

Abstract

We report on an exhaustive and systematic study about the photoluminescent properties of nanoporous anodic alumina membranes fabricated by the one-step anodization process under hard conditions in oxalic and malonic acids. This optical property is analysed as a function of several parameters (i.e. hard anodization voltage, pore diameter, membrane thickness, annealing temperature and acid electrolyte). This analysis makes it possible to tune the photoluminescent behaviour at will simply by modifying the structural characteristics of these membranes. This structural tuning ability is of special interest in such fields as optoelectronics, in which an accurate design of the basic nanostructures (e.g. microcavities, resonators, filters, supports, etc.) yields the control over their optical properties and, thus, upon the performance of the nanodevices derived from them (biosensors, interferometers, selective filters, etc.)

Keywords:
Photoluminescence; Hard anodization; Porous alumina; Pore widening; Heat treatment; Geometric characteristics