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O: Oberflächenphysik

O 35: Organic films III

O 35.7: Vortrag

Donnerstag, 30. März 2006, 12:45–13:00, WIL B321

Nanostructured organic templates for the directed self-assembly of gold nanoparticles into confined domains — •Daniel Dahlhaus, Steffen Franzka, Nils Hartmann, and Eckart Hasselbrink — Universität Duisburg-Essen, Campus Essen, Fachbereich Chemie, Universitätsstr. 5, 45141 Essen

A new procedure for the preparation of ordered arrays of gold nanoparticles is demonstrated. Octadecylsiloxane monolayers are grown on native silicon substrates. Subsequently these coatings are patterned using a focused beam of an argon ion laser [1]. The method allows for a well-confined decomposition of the monolayer with a lateral resolution which is significantly below the laser spot diameter. In particular, at a spot diameter of about 2.5 microns, structures with a width of 100 nm and below have been prepared. After patterning the remaining domains of the monolayer are chemically functionalized via amination of the hydrocarbon tails. The chemically functionalized patterns are suitable to direct the adsorption and self-assembly of citrate-coated gold nanoparticles. In particular, gold nanoparticles with an average diameter of 16 nm are shown to self-assemble into quasi one-dimensional structures.

[1] T. Balgar, S. Franzka and N. Hartmann, Appl. Phys. A, in press