Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.48: Poster
Tuesday, March 27, 2012, 18:15–21:45, Poster B
Patterning of the surface termination of ultrananocrystalline diamond films — •Mahsa Mozafari, Alexandra Voss, Cyril Popov, and Johann Peter Reithmaier — Universität Kassel, Institut für Nanostrukturtechnologie und Analytik, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
Diamond and diamond films attract an ever increasing interest for different biotechnological applications due to their extraordinary properties, like excellent biocompatibility, high chemical stability, wide electrochemical window, high wear resistance and optical transparence, etc. Further advantage of the diamond surface is the possibility to tailor the surface termination and respectively the surface properties, including the wettability and conductivity. These properties are decisive for the interactions with any bioentity (cells, proteins, RNA, DNA). In the current work we present the results for the surface modification of ultrananocrystalline diamond/amorphous carbon (UNCD/a-C) composite films and its patterning. The surface of these films is H-terminated after growth, which determines the hydrophobic character and the p-type surface conductivity. Applying O2-plasma, NH3/N2-plasma or UV/O3 modifications it can be rendered hydrophilic and insulating due to the change of the surface termination. The modified surfaces were investigated by contact angle measurements, SEM, AFM, XPS and electrical measurements. Further, the possibility to pattern the surface termination by electron, ion and laser beams was also studied.