Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Metal Oxide Surfaces II: Structure, Epitaxy and Growth

O 37.9: Talk

Tuesday, April 2, 2019, 16:00–16:15, H16

Probing copper oxidation by in-situ optical spectroscopy — •Björn Maack and Niklas Nilius — Institute of Physics, Carl von Ossietzky University, 26111 Oldenburg, Germany

The oxidation characteristic of metals stands in the focus of fundamental and applied research already for many decades. Standard rate-laws for oxidation, as predicted by Cabrera/Mott and Wagner, are typically valid only at the onset of oxide formation and deviate from the experimental findings with increasing oxide thickness. Using optical transmission spectroscopy, we have followed the process of copper oxidation in-situ at well-defined pressure and temperature conditions. The data were analyzed with the transfer-matrix method, including plasmonic, percolation and interference effects. The derived time-dependence of oxide growth reveals an accelerated rate at intermediate film thicknesses, in contrast to classical theories. This behavior is understood, if the increase of the reactive metal-oxide interface is considered together with the diffusive transport of the reactive species.