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Regensburg 2007 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 19: Biosensors and Biofunctionalized Systems

BP 19.4: Vortrag

Mittwoch, 28. März 2007, 16:15–16:30, H43

Chemical Grafting of Biphenyl Self-Assembled Monolayers on Diamond for the Electro-Addressing of Proteins — •Simon Lud1, Florian Spirkl1, Marin Steenackers2, Rainer Jordan2, Paola Bruno3, Dieter M. Gruen3, Stefan Neppl4, Peter Feulner4, Jose A. Garrido1, and Martin Stutzmann11Walter Schottky Institut, Technische Universität München — 2Lehrstuhl für Makromolekulare Stoffe, Technische Universität München — 3Materials Science Department, Argonne National Laboratory — 4Physics Department E20, Technische Universität München

We have explored the formation of self-assembled monolayers (SAMs) of 4’-nitro-1,1-biphenyl-4-diazonium tetrafluoroborate (NBD) onto ultrananocrystalline diamond (UNCD) thin films. In contrast to the established method to modify diamond and diamond like substrates by electrografting, the SAM was formed from the saturated solution of NBD in acetonitrile by spontaneous chemical grafting. Atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), and near edge X-ray absorption fine structure spectroscopy (NEXAFS) have been used to verify the direct covalent attachment of the 4’-nitro-1,1-biphenyl (NB) SAM on the diamond substrate via stable C-C bonds. The results confirm the presence of a very stable, homogeneous, and dense monolayer. Quantitative analysis by XPS, NEXAFS, and CV has confirmed the presence of a densely packed monomolecular layer with a grafting density of 4.5-5.3 x 10−10mol/cm2, equivqalent to a nominal area of 31-37 Å2/molecule.

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