Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 2: Atmospheric Plasmas and their Applications I

P 2.6: Vortrag

Montag, 31. März 2025, 15:30–15:45, ZHG006

Tuning plasma chemistry by various excitation mechanisms for the H₂O₂ production of atmospheric pressure plasma jets — •Steffen Schüttler, Niklas Eichstaedt, and Judith Golda — Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, Germany

Atmospheric pressure plasmas (APPJs) are widely used in various fields of research and applications. There are plenty of different APPJs designed with various geometries and excitation mechanisms ranging from µs and fast ns pulses pulsed at kHz frequencies to RF-driven waveforms. A direct comparison of these APPJs is challenging as the different excitation mechanisms at different geometries are barely comparable. In this work, a capillary plasma jet was used that is operable at kHz pulsing with a high voltage pulse with µs or ns rise time and a sinusoidal voltage pulse at 13.56 MHz (RF) at the same plasma jet geometry [1]. The effect of the excitation mechanisms on the production of H₂O₂ was investigated by treating liquids and measuring the H₂O₂ concentration in the treated liquid. The plasma jet is operable under all excitation mechanisms up to a plasma power of 1.5 W. An increased humidity admixture and higher plasma powers lead to enhanced H₂O₂ production under all excitation mechanisms. The fast ns pulses and the RF operation show similar results, while the µs operation is less effective.

This work is supported by the DFG within CRC 1316 (Subproject B11, project number 327886311).

[1] S. Schüttler et al 2025 J. Phys. D: Appl. Phys. 58 025203

Keywords: Atmospheric pressure plasma; H$_2$O$_2$; excitation mechanisms; kHz pulsing; RF