Near-Infrared emission of O2 embedded in amorphous SiO2 nanoparticles

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18 Citazioni (Scopus)

Abstract

We report an experimental study on the emission properties of O2molecules loaded by a thermal diffusion process at 200 °C into high-purity silicananoparticles with mean diameters of 7 and 40 nm. The embedded O2 features a singletto triplet emission band peaked at 1272 nm in agreement with the band observed for bulksilica materials. The photoluminescence excitation spectra have been determined in the visible and in the infrared range and are characterized by narrow bands peaked at 691, 764,and 1069 nm, respectively. By comparison of the transition energies, the vibrational quanta have been determined for the ground and for both the excited states; the values found are lower than the corresponding energies reported for the O2 gaseous molecule. The singlet to triplet emission lifetime has been also evaluated and shows a value lower than that typically reported for bulk silica. Our results show that even if the main spectroscopic properties of O2 embedded in nanometric silica are analogous to those of free O2 and O2 embedded in bulk silica, the nanometric host imposes differences related to the dynamics of the electronic states.
Lingua originaleEnglish
pagine (da-a)12831-12835
Numero di pagine5
RivistaDefault journal
Volume115
Stato di pubblicazionePublished - 2011

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Silicon Dioxide
Nanoparticles
Infrared radiation
Thermal diffusion
Electronic states
Excited states
Photoluminescence
Molecules

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cita questo

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title = "Near-Infrared emission of O2 embedded in amorphous SiO2 nanoparticles",
abstract = "We report an experimental study on the emission properties of O2molecules loaded by a thermal diffusion process at 200 °C into high-purity silicananoparticles with mean diameters of 7 and 40 nm. The embedded O2 features a singletto triplet emission band peaked at 1272 nm in agreement with the band observed for bulksilica materials. The photoluminescence excitation spectra have been determined in the visible and in the infrared range and are characterized by narrow bands peaked at 691, 764,and 1069 nm, respectively. By comparison of the transition energies, the vibrational quanta have been determined for the ground and for both the excited states; the values found are lower than the corresponding energies reported for the O2 gaseous molecule. The singlet to triplet emission lifetime has been also evaluated and shows a value lower than that typically reported for bulk silica. Our results show that even if the main spectroscopic properties of O2 embedded in nanometric silica are analogous to those of free O2 and O2 embedded in bulk silica, the nanometric host imposes differences related to the dynamics of the electronic states.",
keywords = "diffusione, fosforescenza, fumed silica, nanoparticelle",
author = "Gelardi, {Franco Mario} and Roberto Boscaino and Lavinia Vaccaro and Maurizio Leone and Valeria Militello and Marco Cannas and Simonpietro Agnello and Gianfranco Vaccaro",
year = "2011",
language = "English",
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pages = "12831--12835",
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TY - JOUR

T1 - Near-Infrared emission of O2 embedded in amorphous SiO2 nanoparticles

AU - Gelardi, Franco Mario

AU - Boscaino, Roberto

AU - Vaccaro, Lavinia

AU - Leone, Maurizio

AU - Militello, Valeria

AU - Cannas, Marco

AU - Agnello, Simonpietro

AU - Vaccaro, Gianfranco

PY - 2011

Y1 - 2011

N2 - We report an experimental study on the emission properties of O2molecules loaded by a thermal diffusion process at 200 °C into high-purity silicananoparticles with mean diameters of 7 and 40 nm. The embedded O2 features a singletto triplet emission band peaked at 1272 nm in agreement with the band observed for bulksilica materials. The photoluminescence excitation spectra have been determined in the visible and in the infrared range and are characterized by narrow bands peaked at 691, 764,and 1069 nm, respectively. By comparison of the transition energies, the vibrational quanta have been determined for the ground and for both the excited states; the values found are lower than the corresponding energies reported for the O2 gaseous molecule. The singlet to triplet emission lifetime has been also evaluated and shows a value lower than that typically reported for bulk silica. Our results show that even if the main spectroscopic properties of O2 embedded in nanometric silica are analogous to those of free O2 and O2 embedded in bulk silica, the nanometric host imposes differences related to the dynamics of the electronic states.

AB - We report an experimental study on the emission properties of O2molecules loaded by a thermal diffusion process at 200 °C into high-purity silicananoparticles with mean diameters of 7 and 40 nm. The embedded O2 features a singletto triplet emission band peaked at 1272 nm in agreement with the band observed for bulksilica materials. The photoluminescence excitation spectra have been determined in the visible and in the infrared range and are characterized by narrow bands peaked at 691, 764,and 1069 nm, respectively. By comparison of the transition energies, the vibrational quanta have been determined for the ground and for both the excited states; the values found are lower than the corresponding energies reported for the O2 gaseous molecule. The singlet to triplet emission lifetime has been also evaluated and shows a value lower than that typically reported for bulk silica. Our results show that even if the main spectroscopic properties of O2 embedded in nanometric silica are analogous to those of free O2 and O2 embedded in bulk silica, the nanometric host imposes differences related to the dynamics of the electronic states.

KW - diffusione

KW - fosforescenza

KW - fumed silica

KW - nanoparticelle

UR - http://hdl.handle.net/10447/55100

M3 - Article

VL - 115

SP - 12831

EP - 12835

JO - Default journal

JF - Default journal

ER -