Regensburg 2022 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 20: Poster

DS 20.51: Poster

Mittwoch, 7. September 2022, 16:00–18:00, P3

Fabrication and electrochemical characterization of 2D membranes — •Yossarian Liebsch — Universität Duisburg-Essen, AG Schleberger, Germany

Membranes are critical components in widely used industrial and technical processes, e.g., water filtration, desalination and energy storage and conversion. With their extreme thinness of only a few angstrom, two-dimensional (2D) materials have the potential to be used as highly efficient membranes, possibly outperforming conventional membranes by orders of magnitude. We fabricated two different types of 2D membranes: Membranes made of commercially available CVD-grown graphene and membranes made of self grown CVD MoS₂. The membranes were made by transferring the 2D material onto a 3 µm micropore. Subsequently the membranes were plasma etched (graphene) or irradiated by highly charged ions (MoS₂) in order to create nanopores. Raman and photoluminescence spectroscopy was used to analyse the membranes in terms of doping, stress and defects density. Additionally an electrochemical characterization of the membranes was done in a custom build membrane potential measurement stand. In case of the graphene membranes the measured membrane potentials were in good agreement to the well-known Theorell-Meyer-Sievers Theory. However for the MoS₂ membranes no potential could yet be measured. In upcoming experiments with this electrochemical cell we aim to investigate the correlations between the pore creation mechanisms and intrinsic membrane properties like pore size, pore chemistry and surface charge density.