Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 20: Organic Polymer-Metal Interfaces (SYSA 7)
DS 20.3: Vortrag
Mittwoch, 27. Februar 2008, 18:30–18:45, H 2013
Immobilization of nanoparticles on polymer brushes for nanosensors — •Smrati Gupta1, Petra Uhlmann1, Ulrich Oertel1, Nikolai Gaponik2, Alexander Eychmüller2, and Manfred Stamm1 — 1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, 01069 Dresden, Germany — 2Technische Universität Dresden, Physikalische Chemie-Elektrochemie, 01062, Dresden, Germany
We report on the immobilization of nanoparticles (Au, Ag or CdTe) on responsive polymer brushes by covalent or electrostatic interactions. Atomic force microscopy (AFM) was used to study the film morphology. The presence of nanoparticles on the polymer brushes was proved by X-ray photoelectron spectroscopy (XPS). Changes in optical properties of quantum dots/metal nanoparticles after the immobilization was studied by photoluminescence or UV-VIS spectroscopy. The exploitation of such polymer brushes revealed suppressed nanoparticle aggregation and facilitated complete surface coverage. Finally, the systems were used to fabricate nanosensors for solvents or for the pH of the surrounding aqueous medium. The concept is based on the variation of the photoluminescence with changing interparticle distance due to the swelling/deswelling of the responsive polymer brushes.