CobaltMaghrebV1, PascalFrancis, Corpus, bibRecord, 000024

Optical study of annealed cobalt-porous silicon nanocomposites

Identifieur interne : 000024 ( PascalFrancis/Corpus ); précédent : 000023; suivant : 000025

Optical study of annealed cobalt-porous silicon nanocomposites

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

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.

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.

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.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

A01	`01`	`1`		`@0 0022-2313`
A02	`01`			`@0 JLUMA8`
A03		`1`		`@0 J. lumin.`
A05				`@2 143`
A08	`01`	`1`	`ENG`	`@1 Optical study of annealed cobalt-porous silicon nanocomposites`
A11	`01`	`1`		`@1 BOUZOURAA (M.-B.)`
A11	`02`	`1`		`@1 RAHMANI (M.)`
A11	`03`	`1`		`@1 ZAÏBI (M.-A.)`
A11	`04`	`1`		`@1 LORRAIN (N.)`
A11	`05`	`1`		`@1 HAJJI (L.)`
A11	`06`	`1`		`@1 OUESLATI (M.)`
A14	`01`			`@1 Unité de Nanomatériaux et Photonique, Faculté des Sciences de Tunis, Département de Physique, 2092 El Manar @2 Tunis @3 TUN @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 6 aut.`
A14	`02`			`@1 Ecole Supérieure des Sciences et Techniques de Tunis, 5 Avenue Taha Hussein @2 1008 Tunis @3 TUN @Z 3 aut.`
A14	`03`			`@1 Université Européenne de Bretagne, CNRS FOTON-UMR 6082, 6 rue de Kérampont, BP 80518 @2 22305 Lannion @3 FRA @Z 4 aut. @Z 5 aut.`
A20				`@1 521-525`
A21				`@1 2013`
A23	`01`			`@0 ENG`
A43	`01`			`@1 INIST @2 14666 @5 354000506590370840`
A44				`@0 0000 @1 © 2013 INIST-CNRS. All rights reserved.`
A45				`@0 27 ref.`
A47	`01`	`1`		`@0 13-0285949`
A60				`@1 P`
A61				`@0 A`
A64	`01`	`1`		`@0 Journal of luminescence`
A66	`01`			`@0 NLD`
C01	`01`		`ENG`	@0 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.
C02	`01`	`3`		`@0 001B70H67`
C02	`02`	`3`		`@0 001B80A07B`
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C03	`01`	`X`	`ENG`	`@0 Excitation energy transfer @5 03`
C03	`01`	`X`	`SPA`	`@0 Transferencia energía excitación @5 03`
C03	`02`	`3`	`FRE`	`@0 Propriété optique @5 41`
C03	`02`	`3`	`ENG`	`@0 Optical properties @5 41`
C03	`03`	`3`	`FRE`	`@0 Photoluminescence @5 43`
C03	`03`	`3`	`ENG`	`@0 Photoluminescence @5 43`
C03	`04`	`3`	`FRE`	`@0 Solution aqueuse @5 45`
C03	`04`	`3`	`ENG`	`@0 Aqueous solutions @5 45`
C03	`05`	`X`	`FRE`	`@0 Spectrométrie FTIR @5 46`
C03	`05`	`X`	`ENG`	`@0 Fourier-transformed infrared spectrometry @5 46`
C03	`05`	`X`	`SPA`	`@0 Espectrometría FTIR @5 46`
C03	`06`	`3`	`FRE`	`@0 Matériau poreux @5 47`
C03	`06`	`3`	`ENG`	`@0 Porous materials @5 47`
C03	`07`	`3`	`FRE`	`@0 Nanomatériau @5 50`
C03	`07`	`3`	`ENG`	`@0 Nanostructured materials @5 50`
C03	`08`	`3`	`FRE`	`@0 Nanocomposite @5 62`
C03	`08`	`3`	`ENG`	`@0 Nanocomposites @5 62`
C03	`09`	`3`	`FRE`	`@0 Cobalt Chlorure @2 NC @2 NA @5 63`
C03	`09`	`3`	`ENG`	`@0 Cobalt Chlorides @2 NC @2 NA @5 63`
C03	`10`	`3`	`FRE`	`@0 Spectre RX @5 64`
C03	`10`	`3`	`ENG`	`@0 X-ray spectra @5 64`
C03	`11`	`X`	`FRE`	`@0 Spectrométrie dispersive @5 65`
C03	`11`	`X`	`ENG`	`@0 Dispersive spectrometry @5 65`
C03	`11`	`X`	`SPA`	`@0 Espectrometría dispersiva @5 65`
C03	`12`	`3`	`FRE`	`@0 Spectre Raman @5 66`
C03	`12`	`3`	`ENG`	`@0 Raman spectra @5 66`
C03	`13`	`3`	`FRE`	`@0 Silicium @2 NC @5 67`
C03	`13`	`3`	`ENG`	`@0 Silicon @2 NC @5 67`
C03	`14`	`X`	`FRE`	`@0 Oxyde de cobalt @5 68`
C03	`14`	`X`	`ENG`	`@0 Cobalt oxide @5 68`
C03	`14`	`X`	`SPA`	`@0 Cobalto óxido @5 68`
C03	`15`	`3`	`FRE`	`@0 Transfert radiatif @5 69`
C03	`15`	`3`	`ENG`	`@0 Radiative transfer @5 69`
C03	`16`	`3`	`FRE`	`@0 Si @4 INC @5 71`
C03	`17`	`3`	`FRE`	`@0 8107 @4 INC @5 83`
C03	`18`	`3`	`FRE`	`@0 7867 @4 INC @5 84`
N21				`@1 273`

Format Inist (serveur)

NO :	PASCAL 13-0285949 INIST
ET :	Optical study of annealed cobalt-porous silicon nanocomposites
AU :	BOUZOURAA (M.-B.); RAHMANI (M.); ZAÏBI (M.-A.); LORRAIN (N.); HAJJI (L.); OUESLATI (M.)
AF :	Unité de Nanomatériaux et Photonique, Faculté des Sciences de Tunis, Département de Physique, 2092 El Manar/Tunis/Tunisie (1 aut., 2 aut., 3 aut., 6 aut.); Ecole Supérieure des Sciences et Techniques de Tunis, 5 Avenue Taha Hussein/1008 Tunis/Tunisie (3 aut.); Université Européenne de Bretagne, CNRS FOTON-UMR 6082, 6 rue de Kérampont, BP 80518/22305 Lannion/France (4 aut., 5 aut.)
DT :	Publication en série; Niveau analytique
SO :	Journal of luminescence; ISSN 0022-2313; Coden JLUMA8; Pays-Bas; Da. 2013; Vol. 143; Pp. 521-525; Bibl. 27 ref.
LA :	Anglais
EA :	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.
CC :	001B70H67; 001B80A07B
FD :	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
ED :	Excitation energy transfer; Optical properties; Photoluminescence; Aqueous solutions; Fourier-transformed infrared spectrometry; Porous materials; Nanostructured materials; Nanocomposites; Cobalt Chlorides; X-ray spectra; Dispersive spectrometry; Raman spectra; Silicon; Cobalt oxide; Radiative transfer
SD :	Transferencia energía excitación; Espectrometría FTIR; Espectrometría dispersiva; Cobalto óxido
LO :	INIST-14666.354000506590370840
ID :	13-0285949

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Pascal:13-0285949

Le document en format XML

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<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>
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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>
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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>
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<fA11 i1="02" i2="1"><s1>RAHMANI (M.)</s1>
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<fA11 i1="03" i2="1"><s1>ZAÏBI (M.-A.)</s1>
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<fA14 i1="01"><s1>Unité de Nanomatériaux et Photonique, Faculté des Sciences de Tunis, Département de Physique, 2092 El Manar</s1>
<s2>Tunis</s2>
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<sZ>3 aut.</sZ>
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<fA14 i1="03"><s1>Université Européenne de Bretagne, CNRS FOTON-UMR 6082, 6 rue de Kérampont, BP 80518</s1>
<s2>22305 Lannion</s2>
<s3>FRA</s3>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</fA14>
<fA20><s1>521-525</s1>
</fA20>
<fA21><s1>2013</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>14666</s2>
<s5>354000506590370840</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2013 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>27 ref.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>13-0285949</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Journal of luminescence</s0>
</fA64>
<fA66 i1="01"><s0>NLD</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>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.</s0>
</fC01>
<fC02 i1="01" i2="3"><s0>001B70H67</s0>
</fC02>
<fC02 i1="02" i2="3"><s0>001B80A07B</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Transfert énergie excitation</s0>
<s5>03</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Excitation energy transfer</s0>
<s5>03</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Transferencia energía excitación</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="3" l="FRE"><s0>Propriété optique</s0>
<s5>41</s5>
</fC03>
<fC03 i1="02" i2="3" l="ENG"><s0>Optical properties</s0>
<s5>41</s5>
</fC03>
<fC03 i1="03" i2="3" l="FRE"><s0>Photoluminescence</s0>
<s5>43</s5>
</fC03>
<fC03 i1="03" i2="3" l="ENG"><s0>Photoluminescence</s0>
<s5>43</s5>
</fC03>
<fC03 i1="04" i2="3" l="FRE"><s0>Solution aqueuse</s0>
<s5>45</s5>
</fC03>
<fC03 i1="04" i2="3" l="ENG"><s0>Aqueous solutions</s0>
<s5>45</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Spectrométrie FTIR</s0>
<s5>46</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Fourier-transformed infrared spectrometry</s0>
<s5>46</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Espectrometría FTIR</s0>
<s5>46</s5>
</fC03>
<fC03 i1="06" i2="3" l="FRE"><s0>Matériau poreux</s0>
<s5>47</s5>
</fC03>
<fC03 i1="06" i2="3" l="ENG"><s0>Porous materials</s0>
<s5>47</s5>
</fC03>
<fC03 i1="07" i2="3" l="FRE"><s0>Nanomatériau</s0>
<s5>50</s5>
</fC03>
<fC03 i1="07" i2="3" l="ENG"><s0>Nanostructured materials</s0>
<s5>50</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE"><s0>Nanocomposite</s0>
<s5>62</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG"><s0>Nanocomposites</s0>
<s5>62</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE"><s0>Cobalt Chlorure</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>63</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG"><s0>Cobalt Chlorides</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>63</s5>
</fC03>
<fC03 i1="10" i2="3" l="FRE"><s0>Spectre RX</s0>
<s5>64</s5>
</fC03>
<fC03 i1="10" i2="3" l="ENG"><s0>X-ray spectra</s0>
<s5>64</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Spectrométrie dispersive</s0>
<s5>65</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Dispersive spectrometry</s0>
<s5>65</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Espectrometría dispersiva</s0>
<s5>65</s5>
</fC03>
<fC03 i1="12" i2="3" l="FRE"><s0>Spectre Raman</s0>
<s5>66</s5>
</fC03>
<fC03 i1="12" i2="3" l="ENG"><s0>Raman spectra</s0>
<s5>66</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Silicium</s0>
<s2>NC</s2>
<s5>67</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Silicon</s0>
<s2>NC</s2>
<s5>67</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Oxyde de cobalt</s0>
<s5>68</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>Cobalt oxide</s0>
<s5>68</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Cobalto óxido</s0>
<s5>68</s5>
</fC03>
<fC03 i1="15" i2="3" l="FRE"><s0>Transfert radiatif</s0>
<s5>69</s5>
</fC03>
<fC03 i1="15" i2="3" l="ENG"><s0>Radiative transfer</s0>
<s5>69</s5>
</fC03>
<fC03 i1="16" i2="3" l="FRE"><s0>Si</s0>
<s4>INC</s4>
<s5>71</s5>
</fC03>
<fC03 i1="17" i2="3" l="FRE"><s0>8107</s0>
<s4>INC</s4>
<s5>83</s5>
</fC03>
<fC03 i1="18" i2="3" l="FRE"><s0>7867</s0>
<s4>INC</s4>
<s5>84</s5>
</fC03>
<fN21><s1>273</s1>
</fN21>
</pA>
</standard>
<server><NO>PASCAL 13-0285949 INIST</NO>
<ET>Optical study of annealed cobalt-porous silicon nanocomposites</ET>
<AU>BOUZOURAA (M.-B.); RAHMANI (M.); ZAÏBI (M.-A.); LORRAIN (N.); HAJJI (L.); OUESLATI (M.)</AU>
<AF>Unité de Nanomatériaux et Photonique, Faculté des Sciences de Tunis, Département de Physique, 2092 El Manar/Tunis/Tunisie (1 aut., 2 aut., 3 aut., 6 aut.); Ecole Supérieure des Sciences et Techniques de Tunis, 5 Avenue Taha Hussein/1008 Tunis/Tunisie (3 aut.); Université Européenne de Bretagne, CNRS FOTON-UMR 6082, 6 rue de Kérampont, BP 80518/22305 Lannion/France (4 aut., 5 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of luminescence; ISSN 0022-2313; Coden JLUMA8; Pays-Bas; Da. 2013; Vol. 143; Pp. 521-525; Bibl. 27 ref.</SO>
<LA>Anglais</LA>
<EA>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.</EA>
<CC>001B70H67; 001B80A07B</CC>
<FD>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</FD>
<ED>Excitation energy transfer; Optical properties; Photoluminescence; Aqueous solutions; Fourier-transformed infrared spectrometry; Porous materials; Nanostructured materials; Nanocomposites; Cobalt Chlorides; X-ray spectra; Dispersive spectrometry; Raman spectra; Silicon; Cobalt oxide; Radiative transfer</ED>
<SD>Transferencia energía excitación; Espectrometría FTIR; Espectrometría dispersiva; Cobalto óxido</SD>
<LO>INIST-14666.354000506590370840</LO>
<ID>13-0285949</ID>
</server>
</inist>
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Optical study of annealed cobalt-porous silicon nanocomposites

Optical study of annealed cobalt-porous silicon nanocomposites

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