Dresden 2011 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.10: Poster
Wednesday, March 16, 2011, 17:00–19:00, P2
Combinatorial synthesis and characterisation of binary plasmonic metal nanoparticles in micro fluid segment sequences — •Andrea Knauer1, Steffen Schneider1, Andrea Csáki2, Wolfgang Fritzsche2, and J. Michael Köhler1,2 — 1Techn. University of Ilmenau, Germany — 2Inst. for Photonic Technologies, Jena, Germany
This work reports on the screening of optical properties of Au/Ag core/shell and multishell nanoparticles by automated stepwise variation of reactant ratios in two and three dimensional parameter spaces during the micro continuous-flow synthesis under segmented-flow conditions. The optical properties of binary metal nanoparticles shift with the layer ratio of the metallic components as well as with their shape, size, surface charge and ligand-shell. Therefore, the optimization of the optical properties is a multi parameter problem demanding for new experimental strategies. The complete space of the combinations of the reactant concentrations was covered by combined slowly shifting flow rates for two reactants and a periodically fast shifting flow rate of a third solution. The total flow rate was kept constant. For these synthesis screenings, the concentrations of metal salts, reducing agent, and added ligands were varied. The three-dimensional addressing of parameter spaces can be used for finding the optimal conditions for a narrow size distribution of the obtained nanoparticles and for a tuning of their optical properties.