https://doi.org/10.1007/s100510070243
Preparation and characterization of nano-sized Ag/PVP composites for optical applications
1
Institute of Composite Materials Technology, National Research
Council, Piazzale Tecchio 80, 80125 Napoli, Italy
2
Department
of Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80,
80125 Napoli, Italy
3
INFM, Department of Physical Sciences, University of Naples Federico II, Piazzale Tecchio
80, 80125 Napoli, Italy
Corresponding author: a gpepe@na.infn.it
Received:
10
November
1999
Published online: 15 July 2000
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.
PACS: 81.05.Ys – Nanophase materials / 78.40.Fy – Semiconductors / 78.40.Ha – Other nonmetallic inorganics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
