Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Colloidal and Nanoparticles
CPP 13.4: Talk
Tuesday, February 26, 2008, 15:45–16:00, C 264
Switchable photoluminiscent CdTe nanocrystals by temperature responsive microgels — Mukesh Agrawal1, Smrati Gupta1, Vera Cimrova2, Nikolai Gaponik3, Alexander Eychmüller3, Spyros Tzavalas1, Rosana Rojas-Reyna1, •Jorge Rubio-Retama1, Manfred Stamm1, and Nikolaos E. Zafeiropoulos1 — 1Leibniz-Institut für Polymerforschung Dresden, Hohe Strasse 6, Dresden 01069, Germany — 2Institute of Macromolecular Chemistry Praha, Czech Republic — 33Physcal-Chemistry Department, Teknische Universität Dresden, Dresden 01069 Germany
Microgels are perhaps of the most promising responsive systems due to their high specific surface, which yields materials with very short response time. In the present study we report a facile and reproducible method for preparing fluorescence thermo-sensitive hybrid material based on monodispersed and thermosensitive P(NIPAM) microgels covered with nanocrystals of CdTe of 3.2 nm of diameter. The CdTe nanocrystals were covalently immobilized on the surface of the microgels. Through temperature variation it was possible to modify the chemical environment around the CdTe nanocrystals. This change provoked a variation in the nanocrystal photoluminescence properties in such way that when the temperature was under the LCST of the polymer the photoluminescence of the nanocrystals was strongly quenched, while when the temperature was above the LCST of the microgels (36 C) the photoluminescence properties of the nanocrystals were strongly enhanced.