Regensburg 2002 – wissenschaftliches Programm

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O: Oberflächenphysik

O 4: Oberfl
ächenreaktionen (I)

O 4.4: Vortrag

Montag, 11. März 2002, 12:00–12:15, H43

Modelling of surface modifications caused by separated plasma species — •Markus Bach and Manfred Neumann — University of Osnabrück, Fachbereich Physik, Barbarastrasse 7, 49069 Osnabrück, Germany

To understand the plasma modification of polymer surfaces is a very complex task. The reactions in the plasma must be considered as well as the different interaction of the plasma species with the surface. Modifications caused by the plasma were reproduced by irradiation the sample with electrons or UV-light in our experimental set-up. One of the reactions on the polymer surface is the formation of double bonds. In order to detect these with x-ray photoelectron spectroscopy (XPS), we have to label them in a chemical reaction with bromine. In order to obtain concentration depth profiles in a non-destructive way, we performed angle dependant XPS measurements. For the separated modifications as well as for the plasma treatment we saw an increase of bromine concentration at the surface. The differences in the concentration profiles can be described and understood with respect to the different penetration depths for radiation and particles. In another reaction we passivate the radicals with nitrogen monoxide and investigate the chemical shifts of the nitrogen binding energy for the resulting group. These energies are specific for the kind of radical in the polymer chain caused by the plasma or the separated species.