Dresden 2009 – wissenschaftliches Programm
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SYSO: Symposium Self-organizing Surfaces and Interfaces
SYSO 3: Self-Organizing Surfaces and Interfaces - Posters
SYSO 3.1: Poster
Mittwoch, 25. März 2009, 17:30–19:30, P3
Controlling Structural Properties of Self-Assembled Oligonucleotide - Mercaptohexanol Monolayers — •Kurt Kummer1, Alfred Kick2, Martin Bönsch2, Denis Vyalikh1, Michael Mertig2, and Serguei Molodtsov1 — 1Institute of Solid State Physics, Dresden University of Technology, D-01062 Dresden, Germany — 2BioNanotechnology and Structure Formation Group, Max Bergmann Center of Biomaterials and Institute of Materials Science, Technische Universität Dresden, D-01062 Dresden, Germany
We present results of our recent investigations on the chemical conditions for the formation of mixed self-assembled monolayers of thiol-modified oligonucleotides and mercaptohexanol deposited onto gold surfaces. Using high-resolution X-ray photoemission spectroscopy we found that the spatial density of DNA strands can be varied in a controlled manner within a wide range by the concentration of MgCl2 in the immobilization buffer. We were also able to illuminate the question how the DNA probes affect the quality of the mercaptohexanol SAM more deeply. In particular, the use of aqueous instead of ethanolic mercaptohexanol solutions with a more moderate mercaptohexanol concentration is demonstrated to be favorable for the formation of high-quality mixed monolayers.