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Luminescent silicon nanocrystals produced by near-infrared nanosecond pulsed laser ablation in water

  • Autori: Vaccaro, L.; Sciortino, L.; Messina, F.; Buscarino, G.; Agnello, S.; Cannas, M.
  • Anno di pubblicazione: 2014
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • Parole Chiave: Laser ablation;Si nanocrystal;Silica;Core–shell;Time-resolved luminescence;Atomic force microscopy;Micro-Raman;IR absorption
  • OA Link: http://hdl.handle.net/10447/96050

Abstract

We report the investigation of luminescent nanoparticles produced by ns pulsed Nd:YAG laser ablation of silicon in water. Combined characterization by AFM and IR techniques proves that these nanoparticles have a mean size of ∼3 nm and a core–shell structure consisting of a Si-nanocrystal surrounded by an oxide layer. Time resolved luminescence spectra evidence visible and UV emissions; a band around 1.9 eV originates from Si-nanocrystals, while two bands centered at 2.7 eV and 4.4 eV are associated with oxygen deficient centers in the SiO2 shell.