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FABRIZIO MESSINA

Oxidation of silicon nanoparticles produced by ns laser ablation in liquids

  • Authors: Vaccaro, L; Camarda, P; Messina, F; Buscarino, G; Agnello, S; Gelardi, F.M; Cannas, M; Boscaino, R
  • Publication year: 2014
  • Type: Proceedings
  • Key words: laser ablation, nanoparticles, oxidation, Si/SiO2 core-shell, time-resolved luminescence
  • OA Link: http://hdl.handle.net/10447/96328

Abstract

The investigation of nanoparticles produced by ns pulsed Nd:YAG laser ablation of silicon in liquids is reported. Combined characterization by morphological and structural techniques shows that these nanoparticles have a mean diameter of ~3 nm and a core-shell structure consisting of a Si-nanocrystal surrounded by a layer of oxidized Si. Time resolved luminescence spectra evidence visible and UV emissions: a broad 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.