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P: Fachverband Plasmaphysik

P 14: Atmospheric Pressure Plasmas and their Applications II

P 14.5: Vortrag

Donnerstag, 2. September 2021, 15:15–15:30, H5

Reaction kinetics of H2O2 in a cold atmospheric pressure plasma jet — •Sarah-Johanna Klose¹, Levin Krös², Igor L Semenov¹, and Jean-Pierre van Helden¹ — ¹Leibniz-Institut für Plasmaforschung und Technologie e.V. (INP), Felix-Hausdorff-Str. 2, Greifswald — ²Universität Greifswald, Greifswald

Since cold atmospheric pressure plasma jets have gained high interest particularly for biomedical applications, the tailoring of the reactive species composition produced by the plasma jet is an important issue. To be able to adapt the reactive species composition and to comprehend the impact of plasmas on cells, a good understanding of the production and consumption mechanisms in the plasma jet is pivotal. Hydrogen peroxide (H2O2) for example is a species with a high impact on cells that works as a signalling agent for intracellular communications when dissolved in a cell containing liquid.

In this work, we present the density distributions of H2O2, HO2, and H and O atoms in the gas phase of the plasma jet kINPen without contact to a liquid and deduce the most important reaction mechanisms by comparing the results to a reaction kinetics model. The distributions were obtained by continuous wave cavity ring-down spectroscopy and picosecond two-photon absorption laser-induced fluorescence spectroscopy. We will discuss the reactions in the plasma zone and the impact of the effluent's surrounding gas composition on the chemistry leading to the formation and consumption of H2O2 and its precursors.