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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.106: Poster

Wednesday, March 16, 2011, 17:30–21:00, P4

Investigations of different techniques for oxygen termination of ultrananocrystalline diamond films — •Alexandra Voss, Hermann Koch, Cyril Popov, and Johann Peter Reithmaier — Universität Kassel, Institut für Nanotechnologie und Analytik, Heinrich-Plett-Straße 40, 34132 Kassel, Germany

Due to the high electrochemical potential window and high chemical stability, combined with a number of superior physical properties, all types of diamond films are ideal candidates for platforms for biosensors and DNA-chips. In almost all cases, after growth the surfaces of these films are hydrogen terminated and require photo-, plasma-, electro- or thermochemical processes to change the termination or to attach desired surface functionalities. In the current work we present the results for the surface modification of ultrananocrystalline diamond/amorphous carbon (UNCD/a-C) composite films by two different methods for oxygen termination, a O₂-plasma process and a UV/ozone treatment. The surfaces emerging from both modification ways were characterized by contact angle (CA) measurements, SEM, XPS, ToF-SIMS and STM, and their longtime stability with respect to different storage conditions was observed. In addition, the rate of the modification was determined with time dependent experiments to achieve highly hydrophilic surfaces (CA below 10º). The modification of the UNCD/a-C films increases their versatility for tailoring the surface properties for applications in biosensors, which requires a variety of functionalities in order to immobilize biomolecules.