Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Poster: Nanoparticles and Composite Materials

CPP 36.18: Poster

Wednesday, March 24, 2010, 17:30–19:00, Poster B2

Optical investigations of plasmons generated in silver nanowires and their influence on the emission of dye molecules — •Florian Feil, Melari Davies, Christophe Jung, Angela Wochnik, Christina Scheu, Jens Michaelis, and Christoph Bräuchle — Department für Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, 81377 München

In recent years there has been a growing interest in coupling of plasmons created in nanostructures such as particles and wires to luminescent particles such as dye molecules or quantum dots. In particular, silver is known for exhibiting plasmon resonances for particle sizes in the nanometer regime. Also the shape of the metal, e.g. the aspect ratio of silver nanowires, has a tremendous influence on the plasmonic properties. Therefore it is first important to characterize the nanowires themselves, because small defects can create local emitting entities. In this work, silver nanowires were synthesized and characterized using transmission electron microscopy (TEM) and fluorescence microscopy. They exhibit interesting fluorescence dynamics such as fluctuations in intensity during laser illumination as well as spectral dynamics. We were able to correlate these effects to the structure of the nanowires by overlaying fluorescence and TEM data. Very interestingly, synchronous emission at several micrometer separated positions of the nanowire could be observed, which requires coupling through the wire. These nanowires were then used to enhance the emission of single fluorescent dye molecules deposited in their vicinity.