Darmstadt 2008 – scientific programme
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P: Fachverband Plasmaphysik
P IV: Poster: Niedertemperaturplasmen II, Astrophysikalische Plasmen, Magnetischer Einschluss, Plasma-Wand-Wechselwirkung
P IV.16: Poster
Thursday, March 13, 2008, 16:00–18:30, Poster C2
XPS Analysis of Polystyrene Surfaces treated with an Atmospheric Pressure Plasma Jet (APPJ) in Ar-Air Mixtures — •A. Vogelsang, H. Steffen, and R. Foest — Leibniz-Institute for Plasma Science and Technology e.V., Greifswald, Germany
Atmospheric plasma jets (APPJ) have been established as tools for local surface treatment with applications for cleaning, activation, and film deposition in particular on 3D surfaces (e.g. trenches, wells or inner walls). Here, the modification of the chemical composition of polystyrene samples after exposure to an APPJ is studied with X-ray photoelectron spectroscopy. As plasma source a non-thermal, rf capillary jet at 27.17 MHz with quartz capillary, central inner rod electrode, and grounded ring electrode [1] was used. The source was operated with argon and small admixtures of N2, O2, or air, respectively. Results of XPS and water contact angle measurements are presented for varying experimental conditions and for static treatment with no relative movement of source and substrate. Exposure to the APPJ results in a substantial incorporation of oxygen. Moreover, a smaller amount of nitrogen functional groups was incorporated into the sample surface. Both elements show a multimodal distribution around the center of the treated area. Different nitrogen-containing groups were detected and their radial distribution is presented. It is concluded that the observed structures are primarily determined by the type of carbon radicals on the surface.
[1] R. Foest, E. Kindel, A. Ohl, M. Stieber, K.-D. Weltmann, Plasma Phys. Contr. Fusion 47 (2005) B525-B536