Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: POSTERS Polymer Physics
CPP 13.15: Poster
Dienstag, 24. März 2009, 14:00–16:30, P3
Quantum dot synthesis on thin polymer films — •Jannis Ochsmann1,2 and Jochen Gutmann1,2 — 1Max-Planck Institute für Polymerforschung, 55128 Mainz, Germany — 2Universität Mainz, 55099 Mainz, Deutschland
Thin polymer films of asymmetric diblock copolymer of polystyrene and poly(ethylene oxide), PS-b-PEO, were spin-coated on glass substrate. The conditions were optimised to obtain cylindrical PEO microdomains normal to the surface1. The obtained PEO domains were swollen by immersing the copolymer film in an acidic thioacetamide solution. Heating the film induces a hydrolysation reaction of the thioacetamide and S2-ions were obtained inside the PEO microdomains. By this means, we created a localized S2-ions source in the film. Immersing the swollen film into a solution of CdCl2, leads to an reaction between the S2-ions and the Cd2+ions at the film/water interface to form CdS quantum dots. The effect of the concentration of thioacetamide, CdCl2, the temperature and pH is investigated with AFM, X-ray reflectivity and UV/Vis spectroscopy.
1Kim, D. H., S. H. Kim, et al. (2004) Nano Letters 4(10): 1841-1844