Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 97: Nanostructure at Surfaces: Structures and Properties

O 97.1: Vortrag

Freitag, 20. März 2015, 10:30–10:45, MA 005

Thin diamond-like carbon (DLC) coatings on bio plastic films of polyhydroxybutyrate (PHB) — •Christian B. Fischer and Stefan Wehner — Department of Physics, University Koblenz-Landau, 56070 Koblenz, Germany

Bio generated and biodegradable polymers represent a promising alternative for conventional petroleum-based plastics. These bio plastics are ideal for packaging in food industry, agricultural usage or in the medical field. In many cases parent plastic material suits mechanical requirements but exhibits poor surface features, leading to bacterial adhesion, for instance. This can be avoided by appropriate surface modifications. One frequently used technique is the coating of parent material with thin films of diamond-like carbon (DLC) via PECVD. The surface morphologies of a 50 μm thick foil of polyhydroxybutyrate (PHB) coated with two different DLC-types of various thicknesses are examined by SEM and AFM. The r-type is sp3-enriched which results in a more robust layer, and the f-DLC is sp2-enriched, making it more flexible. Layers of r-type up to around 450 nm are intact, further deposition results in cracking and exfoliation of the DLC coating due to increasing internal stress. Furthermore, the effect of an improved understanding of hard DLC and soft PHB material is part of the present work.