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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Nanoparticles, Nanocrystals and Composites II

CPP 9.4: Talk

Monday, March 7, 2016, 15:45–16:00, H41

Nucleation and Growth Kinetics of Multinary Nanocrystals by Quick Extended X-ray Absorption Fine Structure — •Justus Just^1,2, Oliver Müller², Claudia Coughlan³, Kevin M. Ryan³, Dirk Lützenkirchen-Hecht², Ronald Frahm², and Thomas Unold¹ — ¹Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany — ²Bergische Universität Wuppertal, Gaußstraße 20, 42109 Wuppertal, Germany — ³Materials and Surface Science Institute and Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland

Early stage nucleation and subsequent growth of multinary nanocrystals (Cu₂ZnSnS₄) are investigated by real time in-situ measurements of the X-ray absorption fine structure at the Cu and Zn K-edges in conjunction with simultaneously measured small angle X-ray scattering and optical transmission. The specially designed hot-injection reaction setup as well as the QEXAFS experimental setup allows to investigate the chemical reaction within timescales of several 10 ms which especially enables the investigation of early reaction stages. We found the monodispersed rod shaped hexagonal nanocrystals to grow within six well distinguishable reaction stages, the kinetics of which are influenced by the choice of ligands and solvents.