Regensburg 2007 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 37: Nano structured materials V
MM 37.1: Vortrag
Donnerstag, 29. März 2007, 16:45–17:00, H4
Assembly of shape controlled nanocrystals at nanopatterned interfaces — •Eva Bock1,2, Angela Fiore3, Liberato Manna3, and Joachim Spatz1,2 — 1Max-Planck-Institute for Metals Research, Dept. New Materials & Biosystems, Heisenbergstr. 3, 70569 Stuttgart, Germany — 2University of Heidelberg, Dept. Biophysical Chemistry, INF 253, 69120 Heidelberg, Germany — 3National Nanotechnology Laboratories of CNR, Via Arnesano, 73100 Lecce, Italy
Gold nanoclusters with diameters between 2 and 30 nm and lateral distances of 20 to 250 nm are arranged onto silicon or glass substrates with a uniform diameter and a defined interparticle spacing. The patterning technique is based on self-assembly of metal loaded diblockcopolymer micelles (poly[styrene-b-2-vinylpyridine(HAuCl4)]) which form a quasi-hexagonal close packed monolayer. The individual gold nanoparticles are potential candidates for immobilizing single molecules or nanoscopic objects. We developed different methods for the assembly of several nanoparticles on nanostructured surfaces. Nanocrystals of different shape and dimensions have been widely developed during the last decade due to their size- and shape-dependent optical, physical and magnetic properties. One method for the assembly of the nanoparticles is based on thiol-chemistry, the other is based on the hybridization of DNA-strands. For the second way the nanocrystals had first to be transferred from organic into aqueous solution.
This work describes an approach which allows for hierarchical organization of different nanocrystals at interfaces which in turn will allow for tuning its optical properties.