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Treatment of aluminium foil by laser interference metallurgy for selective etching

M. D’ALESSANDRIA1,* , F. MÜCKLICH1

Affiliation

  1. Department of Material Science, Institute of Functional Materials, Saarland University, Campus D3.3, room 2.07, P.O. Box 15 11 50, D-66123, Saarbrücken, Germany

Abstract

In the preset work the site-controlled formation of the etch pits in aluminium foil modified by laser interference metallurgy (LIMET) is investigated. The principle of this technique is the fabrication of periodic patterns based on a spatial variation of the intensity created by the interference of several laser beams. Ordered local passivation and/or activation, this last promoted by the introduction of a small amount of lead on the aluminium foil, permit the selective etching of an exposed aluminium surface. By controlling the etching process, a better distribution of the etch pits can be achieved which may ultimately lead to an increase of the total surface area. The obtained ordered array of etch pits can be used to the improvement of electrolytic capacitors, which use surface-enlarged aluminium foil as electrode.

Keywords

Laser interference, Selective etching, Aluminium.

Submitted at: June 19, 2009
Accepted at: Feb. 27, 2010

Citation

M. D’ALESSANDRIA, F. MÜCKLICH, Treatment of aluminium foil by laser interference metallurgy for selective etching, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 3, pp. 783-788 (2010)