CobaltMaghrebV1, Main, Exploration, bibRecord, 000334

Optical study of annealed cobalt-porous silicon nanocomposites

Identifieur interne : 000334 ( Main/Exploration ); précédent : 000333; suivant : 000335

Optical study of annealed cobalt-porous silicon nanocomposites

Auteurs : M.-B. Bouzouraa [Tunisie] ; M. Rahmani [Tunisie] ; M.-A. Zaïbi [Tunisie] ; N. Lorrain [France] ; L. Hajji [France] ; M. Oueslati [Tunisie]

Source :

Journal of luminescence [ 0022-2313 ] ; 2013.

RBID : Pascal:13-0285949

Descripteurs français

Pascal (Inist)
- Transfert énergie excitation, Propriété optique, Photoluminescence, Solution aqueuse, Spectrométrie FTIR, Matériau poreux, Nanomatériau, Nanocomposite, Cobalt Chlorure, Spectre RX, Spectrométrie dispersive, Spectre Raman, Silicium, Oxyde de cobalt, Transfert radiatif, Si, 8107, 7867.
Wicri :
- topic : Cobalt.

English descriptors

KwdEn :
- Aqueous solutions, Cobalt Chlorides, Cobalt oxide, Dispersive spectrometry, Excitation energy transfer, Fourier-transformed infrared spectrometry, Nanocomposites, Nanostructured materials, Optical properties, Photoluminescence, Porous materials, Radiative transfer, Raman spectra, Silicon, X-ray spectra.
mix :
- Annealing temperature, Cobalt, Photoluminescence, Porous silicon, Raman.

Abstract

We report Raman and photoluminescence studies of cobalt-porous silicon nanocomposites (PS/Co). Cobalt was introduced in porous silicon (PS) by immersion method using CoCl₂ aqueous solution. The presence of cobalt in PS matrix was identified by FTIR spectroscopy and EDX analyses. The Raman spectroscopy revealed the presence of Si bonded to cobalt oxide in PS/Co. We discuss also the Raman spectra of PS and PS/Co samples under different annealing temperatures ranging from room temperature (RT) to 600 °C. The optical properties of PS and PS/Co were studied by photoluminescence (PL). The highest PL intensity was observed for an immersion time of 60 min. For long duration, the deposited cobalt quantity acts as energy trap and promotes the non-radiative energy transfer; it is the autoextinction phenomenon. We have studied also the effect of the annealing temperature on the PL of both PS and PS/Co samples. For PS, the annealing process leads to a rapid oxidation of the Si nanocrystallites (nc-Si). In the case of PS/Co sample, two different mechanisms are proposed; one is the desorption of Si-H_x(x=2.3) with the formation of cobalt oxide for annealing temperature less than 450 C which causes the increasing of PL intensity and the stability of PL energy, the other mechanism is the transformation of the porous silicon to silica at high temperatures (>450 C) which leads to the decreasing of the PL intensity and the blue shift of the PL curve.

Url:

https://hal.archives-ouvertes.fr/hal-00840826

Affiliations:

Le document en format XML

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<series><title level="j" type="main">Journal of luminescence</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aqueous solutions</term>
<term>Cobalt Chlorides</term>
<term>Cobalt oxide</term>
<term>Dispersive spectrometry</term>
<term>Excitation energy transfer</term>
<term>Fourier-transformed infrared spectrometry</term>
<term>Nanocomposites</term>
<term>Nanostructured materials</term>
<term>Optical properties</term>
<term>Photoluminescence</term>
<term>Porous materials</term>
<term>Radiative transfer</term>
<term>Raman spectra</term>
<term>Silicon</term>
<term>X-ray spectra</term>
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<term>Spectrométrie FTIR</term>
<term>Matériau poreux</term>
<term>Nanomatériau</term>
<term>Nanocomposite</term>
<term>Cobalt Chlorure</term>
<term>Spectre RX</term>
<term>Spectrométrie dispersive</term>
<term>Spectre Raman</term>
<term>Silicium</term>
<term>Oxyde de cobalt</term>
<term>Transfert radiatif</term>
<term>Si</term>
<term>8107</term>
<term>7867</term>
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<front><div type="abstract" xml:lang="en">We report Raman and photoluminescence studies of cobalt-porous silicon nanocomposites (PS/Co). Cobalt was introduced in porous silicon (PS) by immersion method using CoCl<sub>2</sub>
 aqueous solution. The presence of cobalt in PS matrix was identified by FTIR spectroscopy and EDX analyses. The Raman spectroscopy revealed the presence of Si bonded to cobalt oxide in PS/Co. We discuss also the Raman spectra of PS and PS/Co samples under different annealing temperatures ranging from room temperature (RT) to 600 °C. The optical properties of PS and PS/Co were studied by photoluminescence (PL). The highest PL intensity was observed for an immersion time of 60 min. For long duration, the deposited cobalt quantity acts as energy trap and promotes the non-radiative energy transfer; it is the autoextinction phenomenon. We have studied also the effect of the annealing temperature on the PL of both PS and PS/Co samples. For PS, the annealing process leads to a rapid oxidation of the Si nanocrystallites (nc-Si). In the case of PS/Co sample, two different mechanisms are proposed; one is the desorption of Si-H<sub>x(x=2.3)</sub>
 with the formation of cobalt oxide for annealing temperature less than 450 C which causes the increasing of PL intensity and the stability of PL energy, the other mechanism is the transformation of the porous silicon to silica at high temperatures (>450 C) which leads to the decreasing of the PL intensity and the blue shift of the PL curve.</div>
</front>
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Serveur d'exploration sur le cobalt au Maghreb

Optical study of annealed cobalt-porous silicon nanocomposites

Optical study of annealed cobalt-porous silicon nanocomposites

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

	Serveur d'exploration sur le cobalt au Maghreb
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