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The research will focus on the fundamentals of non-equilibrium plasmas and their interaction with the surrounding media such as solids or liquids using spectroscopic techniques.

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Creative Commons Attribution 4.0 International
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Tuning plasma chemistry by various excitation mechanisms for the H2O2 production of atmospheric pressure plasma jets

Plasma Science Fundamentals

Atmospheric pressure plasmas (APPJs) are widely used for research purposes or industrial applications. There are plenty of different APPJs designed with various geometries and excitation frequencies ranging from kHz over RF (MHz) to fast ns pulses. A direct comparison of these APPJs is often challenging as the different geometries or the different excitation frequencies are not the same and can strongly influence plasma behaviour. In this work, this challenge is met and overcome by the use of an APPJ which can be operated at various excitation frequencies. kHz pulsing with a high voltage peak with μs rise time, sinusoidal voltage pulse at 13.56 MHz and fast high voltage ns pulse are applied to the plasma jet used. The production of H2O2 was investigated by treating liquids and measuring the H2O2 concentration in the treated liquid. Fast ns pulses and RF excitation show similar results, while the kHz excitation is less effective in the H2O2 production

atmospheric pressure plasma jet
plasma-treated liquid
hydrogen peroxide
excitation
FieldValue
Publisher
PIP
Authors
Steffen Schüttler
Niklas Eichstaedt
Judith Golda
Release Date
2024-10-01
Identifier
04dfdc48-5e4b-4955-b417-6042d7b5306c
Permanent Identifier (URI)
https://rdpcidat.rub.de/node/1012
Is supplementing
J. Phys. D: Appl. Phys. 58 025203 (2025)
Plasma Source Name
Capillary Plasma Jet
Plasma Source Specification
atmospheric pressure
ns excitation
kHz
RF
Plasma Source Properties
Two stainless steel electrodes with capillary (borosilicate, wall thickness 0.2mm) in between. Distance between the electrodes: 1.4mm. Width of capillary: 4.5mm, width of grounded electrode: 4mm and width of powered electrode: 1mm. Length of electrodes: 40mm. kHz excitation with pulses in the µs range (up to 9kV) or ns range (up to 5kV) were applied or RF excitation was applied at 13.56 MHz (1.5kV). RF was able to be operated in continuous or pulse mode). Repetition frequencies in the range of 2kHz to 6kHz were used.
Language
English (United Kingdom)
License
Creative Commons Attribution 4.0 International
Plasma Medium Name
He
H2O
Plasma Medium Properties
Flow rate: 1 slm, humidity admixtures: 0 - 6400ppm (0-100% of gas flow through ice cooled bubbler)
Plasma Medium Procedure
Cooling of the bubbler 1h before measurements with 900mL ice cubes and 400mL fridge-cooled water.
Plasma Target Name
distilled water
Contact Name
Schüttler, Steffen
Plasma Target Properties
3 mL liquid volume in UV cuvette of ammonium metavandate solution, adjustment of capillary to a distance of 14mm from liquid surface
Plasma Target Procedure
Ammonium metavandate solution preparation: 3.109 mL sulfuric acid (Fisher Chemical, >95%) was used to dissolve 725.26 mg ammonium metavanadate (Thermo Fisher Scientific, 99.5%) with stirring at 50°C. After complete dilution, the solution was diluted with 1 L of distilled water. The final solution had a pH < 3.
Contact Email
steffen.schuettler@rub.de
Plasma Diagnostic Properties
Absorption spectroscopy with an absorption peak at 450 nm. Light of a laser-driven light source (Energetiq EQ-99 LDLS) and an Avantes spectrometer (Avantes Avaspec-ULS 2049x64 TEC-EVO) were used.
Public Access Level
Public
Plasma Diagnostic Name
Spectrophotometry
Funding Agency
German Science Foundation (DFG)
Project
SFB 1316
Subproject
B11

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