Spectroscopic evidence of positive clusters in Ag colloids obtained by laser ablation in aqueous solutions (Articolo in rivista)

Type
Label
  • Spectroscopic evidence of positive clusters in Ag colloids obtained by laser ablation in aqueous solutions (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00339-014-8277-7 (literal)
Alternative label
  • E. Giorgetti (1); P. Marsili (1,3); M. Muniz-Miranda (2); C. Gellini (2); F. Giammanco (3) (2014)
    Spectroscopic evidence of positive clusters in Ag colloids obtained by laser ablation in aqueous solutions
    in Applied physics. A, Materials science & processing (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • E. Giorgetti (1); P. Marsili (1,3); M. Muniz-Miranda (2); C. Gellini (2); F. Giammanco (3) (literal)
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  • 1 (literal)
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  • 5 (literal)
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  • http://link.springer.com/article/10.1007/s00339-014-8277-7 (literal)
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  • February (literal)
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  • 5 (literal)
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  • online (literal)
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  • Scopu (literal)
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  • (1). Institute of Complex Systems (ISC-CNR), Via Madonna del Piano 10, Sesto Fiorentino, FI, Italy (3). Department of Physics \"E. Fermi\", University of Pisa, Pisa, Italy (2). University of Firenze, Firenze, Italy (literal)
Titolo
  • Spectroscopic evidence of positive clusters in Ag colloids obtained by laser ablation in aqueous solutions (literal)
Abstract
  • We have found evidence of positive cluster formation during the laser ablation process of a silver target in aqueous solutions. In particular, by employing in situ shot-by-shot UV-vis spectroscopy in the early stages of the ablation, we observed a weak and unstable absorption band around 266 nm and a more stable one around 290 nm, which could be assigned to charged clusters like Ag 3 2+ and Ag 4 2+ , respectively. Surface-enhanced Raman scattering experiments performed with a test molecule adsorbed on a silver colloid obtained in pure water were compatible with the presence of Ag 4 2+ active sites on the surface of the Ag nanoparticles. (literal)
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