München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.31: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Characterization of charge distributions on dielectrics due to atmospheric-pressure plasma discharges — •Eric Andersen1, Sven Kraft1, Regina Lange1, Ingo Barke1, Sylvia Speller1, and Ronny Brandenburg1,21Institute of Physics, University of Rostock, 18051 Rostock — 2Leibniz Institute for Plasma Science and Technology (INP), 17489 Greifswald

The interaction of nonthermal plasma with dielectric boundaries leads to a deposition of surface charges, which determine the discharge development and dynamics as well as the effects of plasma surface treatment. The amount and behavior of surface charges are fundamentally important in dielectric barrier discharges [1,2] and plasma jets. Our aim is to study charge distributions on dielectric surfaces such as glass, polymers, and ceramics due to exposure to nonthermal atmospheric-pressure plasma. We explore how these charges are distributed in the outer regions of the discharge footprints. Apart from the distributions, residence times are of interest. Charges can be deposited by means of a helium plasma jet or via corona discharge in air. To study the feature sizes, scanning probe microscopy approaches are employed, i.e. electrostatic and Kelvin probe force microscopy (EFM and KPFM). Sensitivity of both methods needs to be assessed on ordinary reference samples such as interdigitated electrode systems and oxides.

[1] L Stollenwerk et al 2007 Phys Rev Lett. 98 255001,

[2] M Bogaczyk et al 2012 J. Phys. D: Appl. Phys. 45 465202

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