Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Crystallization, Nucleation and Self Assembly I

CPP 14.12: Talk

Tuesday, March 12, 2013, 12:30–12:45, H39

Ripening of ZnO nanoparticles - influence of the stabilizing layer — •Torben Schindler, Martin Schmiele, Thaer Kassar, and Tobias Unruh — Lehrstuhl für Kristallographie und Strukturphysik, Friedrich-Alexander Universität Erlangen Nürnberg, Staudtstr. 3, 91058 Erlangen

ZnO semiconductor nanoparticles (NPs) exhibit promising electro-optical properties for applications in e.g. solar cells or light emitting devices due to the quantum size effect. Thus, the preparation of well-defined, stable ZnO-NPs is of high interest and therefore knowledge about the nucleation and growth processes is crucial.

For the synthesis ethanolic solutions of zincacetate and lithiumhydroxide are simply mixed. The nucleation of the NP occurs instantly, while a further ripening of the ZnO-NPs starting from about 2.5 nm as a function of temperature was observed using UV/Vis measurements. The ripening process is further investigated in detail using temperature- and time-dependent small angle x ray scattering (SAXS) measurements. To determine the influence of the stabilizing acetate layer for the particle growth, small angle neutron scattering (SANS) is used and first results will be presented.