Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster: Surface Reactions

O 35.5: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

Oxide reduction mechanisms on Cu and Fe surfaces under non-thermal plasma — •Viktor Udachin, Fabien Krebs, Oliver Höfft, Lienhard Wegewitz, and Wolfgang Maus-Friedrichs — Clausthal University of Technology, Clausthal-Zellerfeld, Germany

Oxide layers on metal surfaces usually limit the performance of materials in different industrial applications like coating or bonding. Therefore, the ability of rapid reduction of such oxides is of a big interest. Whereas methods as chemical reduction usually require complex procedures to obtain metallic surfaces, non-thermal plasmas have been shown as a quick and environmental-friendly method for surface deoxidation without notable morphological changes. Nevertheless, no detailed information on mechanisms of reduction on different metal systems is accessible. In the current work, the mechanisms of surface oxide reduction under non-thermal dielectric barrier discharge (DBD) Ar/H2 plasma were investigated. We performed depth profile characterization of oxidized Cu and Fe surfaces before and after treatment via angle resolved X-ray photoelectron spectroscopy (AR-XPS). Surface topography of Cu was studied in vacuum with atomic force microscopy (AFM), scanning tunneling microscopy (STM) as well as spectroscopy (STS) directly after oxide reduction, showing individual steps of surface deoxidation. Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 394563137 - SFB 1368

Keywords: Plasma; Deoxidation; Reduction; STM; XPS