Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 6: Thin Film Characterization: Structure Analysis and Composition (XRD, TEM, XPS, SIMS, RBS,...)

DS 6.11: Talk

Monday, March 31, 2014, 17:45–18:00, CHE 89

Isolating free-standing diamond-like carbon membranes from coated biodegradable plastic materials — •Christian B. Fischer, Bastian Pause, Lukas Hoffmann, Alberto Catena, and Stefan Wehner — Department of Physics, University Koblenz-Landau, 56070 Koblenz, Germany

Diamond-like carbon (DLC) as an isolated single free-standing thin film is a very exciting material since it exhibits outstanding properties like high hardness, chemical inertness, selective barrier characteristics etc. The preparation of a 100 nm thick single free-standing DLC-film follows the route of depositing carbonaceous precursors on selected supporting materials first. The isolation of single DLC-pieces is very challenging and comprises several single steps in general. In the present work we report an easy access for stable isolated amorphous carbon (a-C:H) films via delamination from a coated biodegradable polymer. DLC contains a mixture of sp3- and sp2-centers determining its intrinsic hardness. By enhancing the proportion of sp2-carbons a more flexible carbon layer on the pure bioplastic polyhydroxybutyrat (PHB) foil as support is realized by PECVD. Delamination is performed using several organic solvents. The surface structures of uncovered materials and isolated thin films have been analyzed by SEM and AFM spectroscopy. Significant differences of the contact side depending on the used solvent are found. This provides further insights into the interaction of hard DLC coating and soft plastic material.