Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 82: Nanostructures at Surfaces: Graphene and Other Aspects

O 82.2: Talk

Wednesday, March 22, 2017, 16:15–16:30, REC/PHY C213

Amorphous hydrogenated carbon (a-C:H) depositions on polyoxymethylen (POM) - polymer substrate effects for identical depositions — •Christian B. Fischer, Alberto Catena, Liz M. Rösken, and Stefan Wehner — Department of Physics, University Koblenz-Landau, 56070 Koblenz, Germany

The polymer polyoxymethylene (POM) has been gradually covered with a-C:H films by radio frequency plasma-enhanced chemical vapor deposition (RF-PECVD) with acetylene plasma after initial oxygen plasma cleaning. Both steps where performed on the same sample plate together with selected polymers like high-density polyethylene (HDPE) and polyethylene terephthalate (PET). The focus of this investigation is to study specific effects during an identical carbon coating on these chemically different polymer substrates. Especially the interlayer forming behavior between these two materials is of primary interest. Surface morphology was conducted by atomic force microscopy (AFM), the chemical composition by diffusive reflectance infrared Fourier transform (DRIFT), near-edge X-ray absorption (NEXAFS) and micro-Raman spectroscopy. Findings indicate the absence of a solid interlayer formation for POM as found for the other two polymers. Furthermore, the developing a-C:H network on POM is remarkably different to the carbon film structure on HDPE and PET. Altogether these results reveal that different plastic substrates strongly affect the resulting structure of the a-C:H coating during identical depositions.