Dresden 2006 – scientific programme

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HL: Halbleiterphysik

HL 25: C/diamond

HL 25.3: Talk

Tuesday, March 28, 2006, 18:30–18:45, POT 151

Chemical functionalization of ultrananocrystalline diamond thin films with aromatic molecules — •S.Q. Lud¹, M. Dankerl¹, J. Hernando¹, M. Steenackers², R. Jordan², P. Bruno³, D.M. Gruen³, P. Feulner⁴, J.A. Garrido¹, and M. Stutzmann¹ — ¹Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany — ²Lehrstuhl für Makromolekulare Stoffe, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany — ³Materials Science Department, Argonne National Laboratory, Argonne, Illinois 60439, USA — ⁴Physics Department E20, Technische Universität München, James-Franck-Strasse, 85748, Garching, Germany

We present a novel approach for the surface functionalization of ultrananocrystalline diamond films via grafting of high-reactive 4-nitro-biphenyl-4-diazonium cations. The grafting process is associated with the cleavage of dinitrogen followed by the binding of the remaining radicals to the surface, forming a stable and covalent C-C bond. X-ray photoelectron spectroscopy, ac impedance spectroscopy, atomic force microscopy and cyclic voltammetry have been used to investigate the stucture and surface coverage of the organic overlayer. We have further explored the electrochemically controlled conversion of the surface nitro group to an amino group. The resulting surface offers a reliable surface chemistry for subsequent modification in contrast to the non-reactive nitro group. With this approach, an adressable coupling of biological molecules to an inert and inorganic solid substrate, with considerable importance for biosensing tasks, can be explored.