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Preparation and characterization of nano-sized Ag/PVP composites for optical applications |
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| Authors: | G Carotenuto GP Pepe L Nicolais |
| Institution: | (1) Institute of Composite Materials Technology, National Research Council, Piazzale Tecchio 80, 80125 Napoli, Italy, IT;(2) Department of Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy, IT;(3) INFM, Department of Physical Sciences, University of Naples Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy, IT |
| Abstract: | A modification of the polyol process has enabled the direct synthesis of nm-sized Ag particles with narrow size distribution and controlled average dimension embedded in a polymeric matrix. Dispersion of colloidal silver was obtained by reduction of silver nitrate in ethylene-glycol in the presence of a polymeric protective agent (i.e., poly(N-vinylpyrrolidone)) and ultrasounds. The final particle size was controlled by removing the colloid from the reactive mixture by addition of acetone. The very strong plasmon resonance peak at 410 nm and a feature at 350 nm in the UV-visible spectra are a clear consequence of the nano-size of dilute Ag particles. The proposed process offers the possibility to effectively use these synthesised materials for the production of colour filters for advanced optical devices. Received 10 November 1999 |
| Keywords: | PACS 81 05 Ys Nanophase materials - 78 40 Fy Semiconductors - 78 40 Ha Other nonmetallic inorganics |
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