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.
Vaccaro, L., Camarda, P., Messina, F., Buscarino, G., Agnello, S., Gelardi, F.M., et al. (2014). Oxidation of silicon nanoparticles produced by ns laser ablation in liquids. In Fundamentals and applications in silica and advanced dielectrics (SiO2014) [10.1063/1.4900474].
Oxidation of silicon nanoparticles produced by ns laser ablation in liquids
VACCARO, Lavinia;CAMARDA, Pietro;MESSINA, Fabrizio;BUSCARINO, Gianpiero;AGNELLO, Simonpietro;GELARDI, Franco Mario;CANNAS, Marco;BOSCAINO, Roberto
2014-10-21
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.
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