We report an experimental study on the photoluminescence band peaked at 2.7 eV (blue band) induced by thermal treatments in nanometric amorphous SiO 2. In particular the emission dependence on the nanometric particles size as a function of their mean diameter from 7 nm up to 40 nm is investigated. We found that the emission amplitude increases on decreasing the particle diameter, showing a strong correlation between the blue band and the nanometric nature of the particles. By Raman spectroscopy measurements it is evidenced that the SiO2 nanoparticles matrix is significantly affected by the reduction of size. Basing on the shell-like model, these findings are interpreted assuming that the defects responsible for the photoluminescence are localized on a surface shell of the particles and not simply on their surface. In addition it is found that the generation efficiency of these defects depends on the structural properties of the SiO2 matrix in the surface shell. © 2011 Elsevier B.V. All rights reserved.

Vaccaro, G., Agnello, S., Buscarino, G., Cannas, M., Vaccaro, L. (2011). Structural and luminescence properties of amorphous SiO2 nanoparticles. JOURNAL OF NON-CRYSTALLINE SOLIDS, 357(8-9), 1941-1944 [10.1016/j.jnoncrysol.2010.10.040].

Structural and luminescence properties of amorphous SiO2 nanoparticles

VACCARO, GIANFRANCO
;
2011

Abstract

We report an experimental study on the photoluminescence band peaked at 2.7 eV (blue band) induced by thermal treatments in nanometric amorphous SiO 2. In particular the emission dependence on the nanometric particles size as a function of their mean diameter from 7 nm up to 40 nm is investigated. We found that the emission amplitude increases on decreasing the particle diameter, showing a strong correlation between the blue band and the nanometric nature of the particles. By Raman spectroscopy measurements it is evidenced that the SiO2 nanoparticles matrix is significantly affected by the reduction of size. Basing on the shell-like model, these findings are interpreted assuming that the defects responsible for the photoluminescence are localized on a surface shell of the particles and not simply on their surface. In addition it is found that the generation efficiency of these defects depends on the structural properties of the SiO2 matrix in the surface shell. © 2011 Elsevier B.V. All rights reserved.
Articolo in rivista - Articolo scientifico
Point-defect; Raman; Silica nanoparticles; Time-resolved luminescence; Condensed Matter Physics; Ceramics and Composites; Electronic, Optical and Magnetic Materials; Materials Chemistry2506 Metals and Alloys
English
2011
357
8-9
1941
1944
none
Vaccaro, G., Agnello, S., Buscarino, G., Cannas, M., Vaccaro, L. (2011). Structural and luminescence properties of amorphous SiO2 nanoparticles. JOURNAL OF NON-CRYSTALLINE SOLIDS, 357(8-9), 1941-1944 [10.1016/j.jnoncrysol.2010.10.040].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/123853
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