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O: Fachverband Oberflächenphysik

O 16: Organic, Polymeric, and Biomolecular Films I

O 16.11: Talk

Monday, March 26, 2007, 16:45–17:00, H42

Laser-assisted fabrication of nanostructured organic templates for the selective adsorption of gold nanoparticles into confined domains — •Nils Hartmann, Daniel Dahlhaus, Steffen Franzka, and Eckart Hasselbrink — Fachbereich Chemie, Universitätsstr. 5, Universität Duisburg-Essen

A new laser-assisted procedure for the fabrication of nanostructured organic templates is reported. Octadecylsiloxane monolayers are grown on native Si(100) substrates. Subsequently these coatings are patterned using a focused beam of an argon ion laser. Local irradiation results in photothermal decomposition of the monolayers and provides a means for rapid large-area patterning with a lateral resolution significantly below the laser spot diameter [1]. In particular, at a spot diameter of about 2.5 microns, structures with a width below 100 nm are prepared. The patterned monolayers then are chemically functionalized via amination of the remaining hydrocarbon tails. The final chemical patterns represent functional templates which are suitable to direct the adsorption and self-assembly of nanoscopic components into micro- and nanostructured arrays [2]. In particular, citrate-coated gold nanoparticles with an average diameter of 16 nm are shown to self-assemble into one-dimensional arrangements, such as single chains.

1. T. Balgar, S. Franzka and N. Hartmann, Appl. Phys. A 82 (2006) 689.

2. D. Dahlhaus, S. Franzka, E. Hasselbrink and N. Hartmann, Nano Letters 6 (2006) 2358.