Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Supramolecular Aggregates

CPP 1.10: Talk

Monday, March 26, 2007, 12:15–12:30, H37

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

Structuring of surfaces by local oxidation induced by electrical atomic force microscopy opens a way to prepare functional nanostructures. Different properties of the nanostructures compared to the surrounded surfaces can be adjusted by modifying the surface and nanostructure with various monolayers.

We report here on the selective binding of dye molecules as well as nanoparticles by non- covalent bonding. We used silicon (100) as substrates. The silicon surfaces were modified by a covalently bond alkene monolayer. The surface properties can be tuned by using functionalized alkene molecules. The monolayers are characterized by a high physical and chemical stability. By local anodic oxidation the monolayer can be locally degraded and the underlying silicon oxidized leading to silicon oxide nanostructure.[1] Dye molecules and nanoparticles were bond selectively to the nanostructure and/or the surrounding monolayer. Non-covalent interactions as ionic or hydrophobic interactions were responsible for this propose.[2]

[1] M. Ara, H. Graaf, H. Tada, Appl.Phys.Lett. 80(2002) 2565

[2] H. Graaf, M. Vieluf, C. von Borczyskowski, submitted