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Science and Engineering of Composite Materials

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Optical limiters based on silver nanoparticles embedded in amorphous polystyrene

1 / Mariano Palomba1 / Angela Longo1 / Sergio De Nicola2 / Luigi Nicolais1

1Institute of Composite and Biomedical Materials, National Research Council, Piazzale Tecchio, 80, 80125 Napoli, Italy

2National Institute of Optics, National Research Council, Via Campi Flegrei, 34, 80078 Pozzuoli, Italy

Corresponding author

Citation Information: Science and Engineering of Composite Materials. Volume 18, Issue 3, Pages 187–190, ISSN (Online) 2191-0359, ISSN (Print) 0792-1233, DOI: https://doi.org/10.1515/secm.2011.030, September 2011

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A simple technique to prepare plastic color-filters based on the surface plasmon resonance (SPR) of silver nanoparticles has been developed. In particular, silver/polystyrene nanocomposites have been prepared by dissolving silver acetylacetonate in amorphous polystyrene and heating the obtained solid solution at a convenient temperature (ca. 200°C). When the metal precursor decomposes, the produced silver atoms diffuse into the polymeric matrix and clusterize, leading to the formation of a contact-free dispersion of hyperfine silver phase. The obtained films have been characterized by UV-VIS spectroscopy and the optical extinction spectra have been fitted by the Mie’s theory, introducing the limitation of the mean free path due to the collisions of conduction electrons with the boundary of the nanoparticles.

Keywords: nanocomposites; optical filters; polystyrene; silver acetylacetonate; silver nanoparticles; surface plasmon resonance; thermolysis

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