Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTER: Biological Systems + New Materials

CPP 20.26: Poster

Wednesday, March 28, 2007, 16:00–18:30, Poster B

Nanostructuring and nanoaggregates on functionalized surfaces — •Thomas Baumgärtel, Harald Graaf, Maik Vieluf, and Christian von Borczyskowski — Centre for nanostructured materials and analytics, TU Chemnitz, 09107 Chemnitz

We investigated the nano-structuring of silicon covered with an alkene monolayer. This was achieved by local anodic oxidation by an atomic force microscope (AFM). The monolayers are formed by a self assembling process through a heat induced chemical reaction. The molecules of these monolayers are highly ordered featuring relative physical and chemical stability. Thus they represent a way to passivate the surface. Furthermore the surface properties could be tuned easily by variation of the head groups of the alkenes.

Local anodic oxidation degrades the monolayer partially and the underneath silicon surface is oxidized resulting in a silicon oxide nanostructure. The organic monolayer influences the oxidation process naturally. A clear dependence of the oxidation time on the stregth of the electric field was found.

The nanometer-sized siliconoxide structures were used for selective binding of optical active materials. Non-covalent interactions (e.g. ionic and hydrophobic) proved to be an elegant way for a selective modification of the structures as well as the surrounding surface. The in this manner modified surfaces have been examined both by atomic force microscopy and optical widefield microscopy.