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Silver-poly(vinylidene flouride-trifluoroethylene) nanocomposites with tunable surface-plasmonic properties

: Greco, T.; Wegener, M.


Andrews, D.L. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nanophotonics IV : 15 - 19 April 2012, Brussels, Belgium
Bellingham, WA: SPIE, 2012 (Proceedings of SPIE 8424)
ISBN: 978-0-8194-9116-9
Art. 84240W
Conference "Nanophotonics" <4, 2012, Brussels>
Fraunhofer IAP ()

Noble metal nanoparticles exhibit tunable optical properties due to surface-plasmon resonances, which depend on the distribution, size and shape of the metallic nanoparticles. In order to handle the nanoparticles they have to be embedded e. g. into a polymer matrix. Here, the synthesis of silver nanoparticles within the polymer matrix is performed by thermal as well as photochemical decomposition of a silver precursor. This in situ synthesis offers the possibility to perform the particle formation before, during or after drying of the soluble polymer matrix. In detail, we focus on the particle generation after processing blends of the polymer and the silver precursor as thin films. A very broad range of mass fractions of nanoparticulate silver from 0.001 up to 0.3 was realized, which allows the adjustment of the surface-plasmon resonance. For low silver nanoparticle contents up to 1 wt.% the surface-plasmon resonance peak is typically observed in the blue spectral regio n, whereas higher silver amounts cause a high extinction in the visible and near infrared spectral range. As polymeric matrix poly(vinylidene fluoride-trifluoroethylene) was chosen und prepared in a thin-film geometry. On the long range the prepared nanocomposites represent multifunctional materials due to the expected ferroelectric properties of the polymer and the surface-plasmon resonance properties of the silver nanoparticles. In addition to the optical properties, the influence of the particle synthesis on the polymer matrix and morphology is studied. As a result, any degradation of the polymer is excluded.