Stuttgart 2012 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 14: Poster: Plasmatechnologie

P 14.16: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.III

Interface reactions of plasma polymerized ethylenediamine thin films on metallic substrates relevant for biomedical applications — •Holger Testrich, Vítězslav Stranak, Rainer Hippler, and Jürgen Meichsner — University of Greifswald, Institute of Physics, Felix-Hausdorff-Str. 6, 17487 Greifswald

Low pressure capacitively coupled 13.56 MHz plasma in a mixture of argon and ethylenediamine was applied for deposition of plasma polymerized ethylenediamine (PPEDA) thin films (20-100 nm) on different metallic substrate materials relevant for biomedical applications. The metallic Cu, Ti/Cu and Ag layers were prepared by high power pulse magnetron sputtering (HIPIMS). The plasma processing parameters (RF power, pressure) have influence on the cross-linking of PPEDA thin films. Therefore, the plasma polymerized thin films are characterized by free macro-radicals and they may contain oligomers or other low-molecular fractions which can undergo chemical reactions in the interface to the metallic substrate or with the ambient air (thin film ageing). In particular, the molecular structure and chemical composition of the thin PPEDA films were studied with the focus on interface reactions with the metallic substrate by use of Fourier Transform infrared-reflection-absorption-spectroscopy (FT-IRRAS). While the Al-surface reveals no reaction with the thin PPEDA film, new absorption bands are found in the combination Cu-PPEDA. Furthermore a temporal development of these absorption bands was observed within 30 days after deposition. Funded by BMBF collaborative research project ''Campus PlasmaMed'', grant no 13N9774.