Mixed Au-Ag nanoparticles were obtained by pulsed laser ablation of metallic targets, subsequently mixing and re-irradiating different volumes of each nano-colloid. The study of these colloids after different irradiation times, performed by spectral analysis in the plasmonic resonance ( PR) region, allows us to ascertain that solid solutions of Aginto Au nano-crystals are obtained after an initial formation of Au(core)-Ag(shell) nanoparticles. These findings are corroborated by fitting the PR spectra with a simulation model based on the Mie-Gans theory. X-ray photoelectron spectroscopy and transmission electron microscopy data support these results and their interpretation. (c) 2008 Elsevier B. V. All rights reserved.
Spectroscopic evidence of a core-shell structure in the earlier formation stages of Au-Ag nanoparticles by pulsed laser ablation in water
COMPAGNINI, Giuseppe Romano;PUGLISI, Orazio Gaetano;
2008-01-01
Abstract
Mixed Au-Ag nanoparticles were obtained by pulsed laser ablation of metallic targets, subsequently mixing and re-irradiating different volumes of each nano-colloid. The study of these colloids after different irradiation times, performed by spectral analysis in the plasmonic resonance ( PR) region, allows us to ascertain that solid solutions of Aginto Au nano-crystals are obtained after an initial formation of Au(core)-Ag(shell) nanoparticles. These findings are corroborated by fitting the PR spectra with a simulation model based on the Mie-Gans theory. X-ray photoelectron spectroscopy and transmission electron microscopy data support these results and their interpretation. (c) 2008 Elsevier B. V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
