Silver nanoparticles were synthesized in vacuum (10-7) by using a Nd:YAG high-power pulsed laser without any catalytic gas and/or thermal annealing processes. The ablated material was collected on several SiO 2/Si substrates (with 50nm thickness) deposited before the laser ablation with a plasma-enhanced chemical vapor deposition system. The substrates were analyzed with the aid of a variable angle spectra ellipsometer at different angles. The analysis revealed the presence of a surface plasmon resonance at about 3eV, which is in good agreement with results in the literature. A deconvolution method utilizing the Lorentz model was applied to fit the experimental optical absorption peaks in order to recognize different groups of nanoclusters with different sizes varying from 2 to 10nm in radius. Electronic elaborations of scanning electron microscopy of the embedded particles in the SiO2 matrix were also carried out to measure their densities as a function of the deposition time and dimension distributions. The experimental measurements were performed at the INFN-LNS laboratory of Catania and at the MT laboratory of the FBK-IRST foundation of Trento.
Copyright 2010 Elsevier B.V., All rights reserved.
- Laser ablation
- Surface plasmon resonance
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Materials Science(all)
- Condensed Matter Physics