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.
Vaccaro, L., Sciortino, L., Messina, F., Buscarino, G., Agnello, S., Cannas, M. (2014). Luminescent silicon nanocrystals produced by near-infrared nanosecond pulsed laser ablation in water. APPLIED SURFACE SCIENCE, 302, 62-65 [10.1016/j.apsusc.2014.01.041].
Luminescent silicon nanocrystals produced by near-infrared nanosecond pulsed laser ablation in water
VACCARO, Lavinia;SCIORTINO, Luisa;MESSINA, Fabrizio;BUSCARINO, Gianpiero;AGNELLO, Simonpietro;CANNAS, Marco
2014-01-01
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.
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