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O: Fachverband Oberflächenphysik
O 78: Nanostructures at Surfaces IV: Various Aspects
O 78.8: Vortrag
Donnerstag, 10. März 2016, 12:15–12:30, S052
Chemical characterization and structural evolution of diamond-like carbon films with increasing deposition on polyethylene terephthalate — •Alberto Catena1, Michael Kunze2, Simone Agnello3, Stefan Wehner1, and Christian B. Fischer1 — 1Department of Physics, University Koblenz-Landau, 56070 Koblenz, Germany — 2Department of Chemistry, University Koblenz-Landau, 56070 Koblenz, Germany — 3Department of Physics and Chemistry, University of Palermo, 90100 Palermo, Italy
The interest in diamond-like carbon (DLC) films on polyethylene terephthalate (PET) steadily increases due to their potential applications as food/beverage packaging and medical devices. Although much is known about the macroscopic features of such composites, the physical and chemical properties of the DLC/PET interface and the film evolution during the deposition are still not fully understood. The films were gradually deposited on PET by radio frequency plasma enhanced chemical vapor deposition with acetylene plasma, and analyzed by Diffusive Reflectance Infrared Fourier Transform and Raman spectroscopy. Chemical changes of the growing films are discussed in terms of subplantation processes and interface effects. After an initial intermixing between DLC and PET forming an interlayer, the epitaxial growth of a polymer-like DLC structure is observed. For higher depositions a structural modification between the polymer-like to a more diamond-like DLC configuration is revealed. This transition is related to the folding of dehydrogenated sp2 segmented chains with subsequent rearrangement of the DLC network in higher depositions.