| Titre : |
Elaboration et caractérisation de matériaux composites à base des nanoparticules du semi-conducteur CuO et de l’oxyde de terre rare Dy2O3 dispersées dans les matrices diélectriques KBr, KCl et NaCl. |
| Type de document : |
texte imprimé |
| Auteurs : |
Samiya Addala, Auteur ; O. Halimi, Directeur de thèse |
| Editeur : |
Constantine : Université Mentouri Constantine |
| Année de publication : |
2015 |
| Importance : |
106 f. |
| Format : |
30 cm. |
| Note générale : |
2 copies imprimées disponibles
|
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
NaCl KCl KBr semiconducteur (CuO) oxyde de terre rare (Dy2O3) Czochralski DRX FT-IR µ-Ramn MEB-EDX UV-Visible photoluminescence semiconductor (CuO) rare earth oxide (Dy2O3) XRD IR μ-Ramn Uvi-Vis البليرات النانومترية نصف الناقل )CuO( أوكسيد)Dy2O3) طريقة شوخرالسكي انعراج أشعة X الامتصاص
الضوئي طيوف ريمان و الأشعة ما تحت الحمراء المجهر الإلكتروني الماسح MEB |
| Index. décimale : |
530 Physique |
| Résumé : |
Elaboration and characterization of composite materials based on nanoparticles of the semiconductor CuO and the rare earth oxide Dy2O3 dispersed in the dielectric matrix of KBr, KCl and NaCl In this work copper oxide (CuO) and dysprosium oxide (Dy2O3) nanocrystals doped KBr, KCl and NaCl single crystals have been grown by Czochralski (Cz) method.
The effects of doping on the structural and optical properties of the host matrices have been studied.
The structural studies of samples were performed by XRD, μ-Raman, IR spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX).The treatment of XRD spectrum confirms the existence of crystallites of dopants (Sb2O3 and Y2O3) in the nanometer regime;Studies by μ-Raman and IR confirmed the
presence of chemical bonds Dy—Oand Cu—O in the different matrices.
The morphological study using the scanning electron microscope (SEM) shows that the micron grains scattered on the surface. The microscopic size of these aggregates is due to the fact that the nanocrystals have a tendency to reduce its free energy (Gibbs energy) of surface. The energy dispersive X-ray analysis (EDX) spectrum indicates that
the NaCl:CuO single crystal has a very high purity.
The optical absorption and photoluminescence shows that the optical gaps of the crystallites (CuO and Dy2O3) have been shifted to the high energy due to the quantum confinement effect of the charges.
The samples have important intense luminescence properties in the ultraviolet range. This feature makes these materials candidates which might come in the manufacture of components for optical systems using shorter wavelengths.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/ADD6746.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=9870 |
Elaboration et caractérisation de matériaux composites à base des nanoparticules du semi-conducteur CuO et de l’oxyde de terre rare Dy2O3 dispersées dans les matrices diélectriques KBr, KCl et NaCl. [texte imprimé] / Samiya Addala, Auteur ; O. Halimi, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 106 f. ; 30 cm. 2 copies imprimées disponibles
Langues : Français ( fre)
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
NaCl KCl KBr semiconducteur (CuO) oxyde de terre rare (Dy2O3) Czochralski DRX FT-IR µ-Ramn MEB-EDX UV-Visible photoluminescence semiconductor (CuO) rare earth oxide (Dy2O3) XRD IR μ-Ramn Uvi-Vis البليرات النانومترية نصف الناقل )CuO( أوكسيد)Dy2O3) طريقة شوخرالسكي انعراج أشعة X الامتصاص
الضوئي طيوف ريمان و الأشعة ما تحت الحمراء المجهر الإلكتروني الماسح MEB |
| Index. décimale : |
530 Physique |
| Résumé : |
Elaboration and characterization of composite materials based on nanoparticles of the semiconductor CuO and the rare earth oxide Dy2O3 dispersed in the dielectric matrix of KBr, KCl and NaCl In this work copper oxide (CuO) and dysprosium oxide (Dy2O3) nanocrystals doped KBr, KCl and NaCl single crystals have been grown by Czochralski (Cz) method.
The effects of doping on the structural and optical properties of the host matrices have been studied.
The structural studies of samples were performed by XRD, μ-Raman, IR spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX).The treatment of XRD spectrum confirms the existence of crystallites of dopants (Sb2O3 and Y2O3) in the nanometer regime;Studies by μ-Raman and IR confirmed the
presence of chemical bonds Dy—Oand Cu—O in the different matrices.
The morphological study using the scanning electron microscope (SEM) shows that the micron grains scattered on the surface. The microscopic size of these aggregates is due to the fact that the nanocrystals have a tendency to reduce its free energy (Gibbs energy) of surface. The energy dispersive X-ray analysis (EDX) spectrum indicates that
the NaCl:CuO single crystal has a very high purity.
The optical absorption and photoluminescence shows that the optical gaps of the crystallites (CuO and Dy2O3) have been shifted to the high energy due to the quantum confinement effect of the charges.
The samples have important intense luminescence properties in the ultraviolet range. This feature makes these materials candidates which might come in the manufacture of components for optical systems using shorter wavelengths.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/ADD6746.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=9870 |
|
Affiner la recherche Interroger des sources externesCaractérisation structurale et optique des nanocristaux du semiconducteur CdSe dispérsés dans la matrice cristalline du KH2PO4 (KDP) / Samiya Addala
