SMuK 2023 – scientific programme

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P: Fachverband Plasmaphysik

P 11: Poster I

P 11.25: Poster

Wednesday, March 22, 2023, 14:00–15:30, HSZ EG

Investigation of the influence of nanosecond pulsed plasmas in water on surfaces and on nanoparticle formation — •Pia-Victoria Pottkämper, Katharina Laake, Elia Jüngling, Oliver Krettek, and Achim von Keudell — Ruhr-Universität Bochum

One application of in-liquid plasmas is the formation of nanoparticles both in the treated liquid and on a surface in contact with the liquid. Plasmas in liquids ignited by voltage pulses with fast rise times and nanosecond pulse lengths applied to an electrode cause a dissociation of the molecules in the liquid. The reactive species created by the in-liquid plasma can propagate through the liquid and are able to modify surfaces in direkt contact with it. For instance it is possible to initiate surface growth of nanoparticles. In this project the modification of copper surfaces by in-liquid plasma treatment is investigated. On copper surfaces nanoparticles can be found in the shape of CuxO nanocubes which can act as catalysts e.g. in the reduction of CO2. The activity of these catalysts decreases over time. The plasma in water causes the formation of reactive oxygen species from the water molecules which can react with the surface to re-oxidize the material, leading to the formation of new CuxO nanocubes. It is postulated that by an in-situ in-liquid plasma treatment a re-activation of the surface could be achieved, thereby extending the lifetime of the catalytic surface. Furthermore the in-liquid plasmas can also yield particles through erosion of the electrode material itself. These particles dissolved in the liquid and their production is also investigated in this project.