Regensburg 2016 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 49: Nanomaterials II: Synthesis

MM 49.4: Talk

Thursday, March 10, 2016, 11:00–11:15, H39

Anodic aluminum oxide: regularity evolution with time, temperature and underlying aluminum structure — •Stefan Ostendorp, Martin Peterlechner, and Gerhard Wilde — Institute of Materials Physics, WWU Münster, 48149 Münster, Germany

Anodic aluminum oxide (AAO) has proven itself as a versatile tool for nano-structuring purposes. Its ability to form a regularly arranged hexagonal pore array renders its utilization as a template or mask for the fabrication of zero- and one-dimensional nanostructures possible. Ever since pre-structuring and multistep anodizations have been introduced to yield regular through-hole structures, AAO has been used for the synthesis of different functional surface nano-structures. However, AAO growth and especially the regularity evolution under certain anodization conditions remained impossible to explain in a comprehensive way. Thus we focus in this work on quantitative investigations of AAO's regularity evolution with anodization time, temperature and with respect to the structure of the aluminum, the AAOs have been anodized from, to derive conditions for regular pore formation. Based on advanced anodization control as well as a graphical regularity analysis, AAOs fabricated under mild and hard anodization conditions have been studied and compared. It has been found, that the aluminum grain size and orientation has only a minor effect on the AAO's regularity. Moreover, there is actually no temperature dependence of the obtained regularity at all. Finally the regularity evolution with time revealed an electrolyte degeneration being responsible for sudden regularity loss, which might have been misinterpreted in previous works.