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O: Fachverband Oberflächenphysik

O 44: Nanostructures at surfaces: Dots, particles, clusters, arrays III

O 44.7: Vortrag

Mittwoch, 16. März 2011, 12:45–13:00, WIL C107

Surface nano-structuring utilizing porous anodic alumina membranes; to the limits and beyond — •Stefan Ostendorp, Yong Lei, and Gerhard Wilde — Institute of Materials Physics and Center for Nanotechnology, University of Münster, 48149 Münster, Germany

Porous anodic alumina membranes (PAAMs) have been intensively investigated for more than two decades, especially for their applications as masks or templates for fabricating various nano-structures of regular hexagonal arrays of wires and tubes. In addition ultra-thin alumina membranes (UTAMs) are used as deposition masks for nano particles. The spacing of the hexagonal structure of PAAMs and UTAMs can be modified within certain limitations, that had been reported in the literature. So far there were only several *allowed* combinations of parameter values reported that lead to highly regular porous structures during the anodization process of the underlying aluminum foil. Here we present our latest results concerning the extension of these limits to larger interpore distances and pore sizes and concerning the ability to create structures with desired spacing. For this purpose, we combined two well known methods during the anodization process, which now allows adjusting the structural parameters beyond the previous known limitations, what is of great importance to device applications based on PAAM- and UTAM- prepared functional nanostructures.