Regensburg 2007 – scientific programme
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.108: Poster
Tuesday, March 27, 2007, 18:00–20:00, Poster B
Adsorption of CdTe nanoparticles on Poly(acrylic acid) brushes — •Smrati Gupta1, Petra Uhlmann1, Nikolai Gaponik2, and Manfred Stamm1 — 1Leibniz-Institut für Polymerforschung Dresden, 01069 Dresden, Germany — 2Technische Universität Dresden, Institut für Physikalische Chemie und Elektrochemie, 01062 Dresden, Germany
We report on the adsorption of amino functionalized CdTe nanoparticles on Poly(acrylic-acid) (PAA) polymer chains, tethered by one end to an underlying substrate in a polymer brush configuration. PAA brushes were prepared on silica substrate via *grafting to* method and 2-aminoethanethiol stabilized CdTe nanoparticles (2-4 nm) were prepared using the reaction between Cd2+ and NaHTe under specific reaction conditions. Functionalized particles were found to get adsorbed on the brushes by the physical interaction between carboxylic groups of PAA polymer chains and amino groups of CdTe nanoparticles. Presence of CdTe nanoparticles on the polymer brushes was confirmed by the Atomic Force Microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and Photoluminescence (PL) spectroscopy. Switching of the modified PAA brushes by changing the pH of surrounding media, explore the use of this system in the fabrication of the sensors.