Structural and luminescence properties of amorphous SiO2 nanoparticles

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Abstract

We report an experimental study on the photoluminescence band peaked at 2.7 eV (blue band) induced bythermal treatments in nanometric amorphous SiO2. In particular the emission dependence on the nanometricparticles size as a function of their mean diameter from 7 nm up to 40 nm is investigated. We found that theemission amplitude increases on decreasing the particle diameter, showing a strong correlation between theblue band and the nanometric nature of the particles. By Raman spectroscopy measurements it is evidencedthat the SiO2 nanoparticles matrix is significantly affected by the reduction of size. Basing on the shell-likemodel, these findings are interpreted assuming that the defects responsible for the photoluminescence arelocalized on a surface shell of the particles and not simply on their surface. In addition it is found that thegeneration efficiency of these defects depends on the structural properties of the SiO2 matrix in the surfaceshell.
Lingua originaleEnglish
pagine (da-a)1941-1944
Numero di pagine4
RivistaDefault journal
Volume357
Stato di pubblicazionePublished - 2011

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Luminescence
Photoluminescence
luminescence
Nanoparticles
nanoparticles
Defects
photoluminescence
Raman spectroscopy
Structural properties
defects
matrices

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

Cita questo

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title = "Structural and luminescence properties of amorphous SiO2 nanoparticles",
abstract = "We report an experimental study on the photoluminescence band peaked at 2.7 eV (blue band) induced bythermal treatments in nanometric amorphous SiO2. In particular the emission dependence on the nanometricparticles size as a function of their mean diameter from 7 nm up to 40 nm is investigated. We found that theemission amplitude increases on decreasing the particle diameter, showing a strong correlation between theblue band and the nanometric nature of the particles. By Raman spectroscopy measurements it is evidencedthat the SiO2 nanoparticles matrix is significantly affected by the reduction of size. Basing on the shell-likemodel, these findings are interpreted assuming that the defects responsible for the photoluminescence arelocalized on a surface shell of the particles and not simply on their surface. In addition it is found that thegeneration efficiency of these defects depends on the structural properties of the SiO2 matrix in the surfaceshell.",
keywords = "Point-defect, Raman, Silica nanoparticles, Time-resolved luminescence",
author = "Marco Cannas and Simonpietro Agnello and Gianpiero Buscarino and Lavinia Vaccaro and Gianfranco Vaccaro",
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TY - JOUR

T1 - Structural and luminescence properties of amorphous SiO2 nanoparticles

AU - Cannas, Marco

AU - Agnello, Simonpietro

AU - Buscarino, Gianpiero

AU - Vaccaro, Lavinia

AU - Vaccaro, Gianfranco

PY - 2011

Y1 - 2011

N2 - We report an experimental study on the photoluminescence band peaked at 2.7 eV (blue band) induced bythermal treatments in nanometric amorphous SiO2. In particular the emission dependence on the nanometricparticles size as a function of their mean diameter from 7 nm up to 40 nm is investigated. We found that theemission amplitude increases on decreasing the particle diameter, showing a strong correlation between theblue band and the nanometric nature of the particles. By Raman spectroscopy measurements it is evidencedthat the SiO2 nanoparticles matrix is significantly affected by the reduction of size. Basing on the shell-likemodel, these findings are interpreted assuming that the defects responsible for the photoluminescence arelocalized on a surface shell of the particles and not simply on their surface. In addition it is found that thegeneration efficiency of these defects depends on the structural properties of the SiO2 matrix in the surfaceshell.

AB - We report an experimental study on the photoluminescence band peaked at 2.7 eV (blue band) induced bythermal treatments in nanometric amorphous SiO2. In particular the emission dependence on the nanometricparticles size as a function of their mean diameter from 7 nm up to 40 nm is investigated. We found that theemission amplitude increases on decreasing the particle diameter, showing a strong correlation between theblue band and the nanometric nature of the particles. By Raman spectroscopy measurements it is evidencedthat the SiO2 nanoparticles matrix is significantly affected by the reduction of size. Basing on the shell-likemodel, these findings are interpreted assuming that the defects responsible for the photoluminescence arelocalized on a surface shell of the particles and not simply on their surface. In addition it is found that thegeneration efficiency of these defects depends on the structural properties of the SiO2 matrix in the surfaceshell.

KW - Point-defect

KW - Raman

KW - Silica nanoparticles

KW - Time-resolved luminescence

UR - http://hdl.handle.net/10447/53855

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VL - 357

SP - 1941

EP - 1944

JO - Default journal

JF - Default journal

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