Berlin 2008 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 4: Novel Methods
BP 4.3: Vortrag
Montag, 25. Februar 2008, 15:00–15:15, PC 203
Immobilization of semiconductor nanocrystals on nanopatterned interfaces — •Eva Bock1, Stefan Kudera1, Angela Fiore2, Liberato Manna2, and Joachim P. Spatz1 — 1Max-Planck-Institute for Metals Research, Dept. of New Materials & Biosystems & University of Heidelberg, Dept. of Biophysical Chemistry, Heisenbergstr. 3, D - 70569 Stuttgart — 2National Nanotechnology Labs of CNR, Via Arnesano, I * 73100 Lecce
Here we describe different approaches for the functionalization of nanopatterned substrates with semiconductor nanocrystals which are exceptional materials for their unique optical flexibility. Gold nanoclusters with diameters between 2 and 30 nm and lateral distances of 20 to 250 nm are arranged onto silicon wafers with a uniform diameter and a defined interparticle spacing. The patterning technique is based on self-assembly of metal loaded diblockcopolymer micelles (polystyrene-b-poly[2-vinylpyridine(HAuCl4)]) which form a quasi-hexagonal closed packed monolayer. The individual gold nanoparticles are potential candidates for immobilizing single molecules or nanoscopic objects. Several approaches proved useful for the immobilization of different semiconductor nanocrystals, such as tetrapods, dimers and dumbbells. One method of assembling nanoparticles on the surface is based on thiol-chemistry, another one is based on the hybridization of DNA. A third approach involves the direct attachment of the nanocrystals on the gold dots without organic linker molecules.