Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: Microfluidics I: Applications and Devices
CPP 34.10: Vortrag
Donnerstag, 26. März 2009, 12:00–12:15, ZEU 160
Promoting selective gold immobilization onto polymer nanotemplates using solution flow-stream technique — •Ezzeldin Metwalli1, Jean-Francois Moulin2, Jan Perlich1, Weinan Wang1, Alexander Dieter1, Stephan V. Roth3, and Peter Müller-Buschbaum1 — 1TU München, Physik Department LS E13, James-Franck-Str.1, 85747 Garching, Germany — 2FRM II, TU München, 85747 Garching, Germany — 3HASYLAB at DESY, Notke Str. 85, 22603 Hamburg, Germany
Guiding gold nanoparticles aggregation into an ordered nano-patterned structure has attracted an immense attention due to applications in nanoelectronics, bioelectronics, and gas sensors. In the current investigation, gold nanoparticles were cast onto nanostructured polymer templates using solutions subjected to hydrodynamic flow by utilizing a simple flow device. Phase-separated polystyrene-block-polyethylene P(S-b-E) diblock copolymer film with parallel cylinder morphology is selected as a nanostructured polymer template. Using in situ grazing incidence small angle X-ray scattering (GISAXS), the progressive gold deposition from solution at various flow rates onto the polymer template attached to the X-ray transparent flow-channel is investigated. The continuously flowing stream of gold solution causes a systematic increase of the X-ray contrast between both phase-separated blocks of the block copolymer template indicating a flow-induced selective gold immobilization. With further gold nanoparticles upload by the continuous flow, the selectivity characteristic of the flow deposition method diminishes with the formation of an almost uniform gold layer.