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Partager le résultat de cette recherche Interroger des sources externesElaboration 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. / Samiya Addala
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
PhysiqueTags : 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 MEBIndex. 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 : 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
PhysiqueTags : 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 MEBIndex. 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 : Permalink : index.php?lvl=notice_display&id=9870 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité ADD/6746 ADD/6746 Thèse Bibliothèque principale Thèses Disponible 
Titre : Elaboration et caractérisation structurale et optique des nanocristaux du semiconducteur Sb2O3 et de l'oxyde Y2O3 dispersés dans les matrices cristallines des halogénures alcalins KBr, KCl et NaCl Type de document : texte imprimé Auteurs : Lazhar Bouhdjer, Auteur ; M. Sebais, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 93 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
PhysiqueTags : semi-conducteur Sb2O3 oxyde de terre rare Y2O3 Czochralski DRX FT-IR μ-Ramn absorption UV-Visible photoluminescence semiconductor (Sb2O3) rare earth oxide (Y2O3) XRD IR μ-
Ramn Uvi-Vis البليرات النانومترية
طريقة شوخرالسكي الامتصاص الضوئي طيوف ريمان و الأشعة ما تحت الحمراء المجهر الإلكتروني الماسح MEB (Sb2O3)نصف الناقل (Y2O3)أوكسيد
أنعراج الأشعة XIndex. décimale : 530 Physique Résumé : Preparation and structural and optical characterization of semiconductor nanocrystals
of Sb2O3 and Y2O3 oxide dispersed in a crystalline matrices of alkali halides KBr, KCl
and NaCl.
In this work antimony oxide (Sb2O3) and yttrium oxide (Y2O3) 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; on the other hand, the existence of the stable monoclinic phase crystallites (Y2O3) under atmospheric conditions reconfirms presence of (Y2O3) in nanoscale.
Studies by μ-Raman and IR confirmed the presence of chemical bonds Y—O and Sb—O in the different matrices.
The morphological study using the scanning electron microscope (SEM) shows that the micron grains scattered on the surface. The volume of these aggregates is due to the fact that the nanocrystals have a tendency to reduce its free energy (Gibbs energy) of surface.
The optical absorption and photoluminescence shows that the optical gaps of the crystallites (Sb2O3 and Y2O3) 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/BOU6378.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9379 Elaboration et caractérisation structurale et optique des nanocristaux du semiconducteur Sb2O3 et de l'oxyde Y2O3 dispersés dans les matrices cristallines des halogénures alcalins KBr, KCl et NaCl [texte imprimé] / Lazhar Bouhdjer, Auteur ; M. Sebais, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2013 . - 93 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
PhysiqueTags : semi-conducteur Sb2O3 oxyde de terre rare Y2O3 Czochralski DRX FT-IR μ-Ramn absorption UV-Visible photoluminescence semiconductor (Sb2O3) rare earth oxide (Y2O3) XRD IR μ-
Ramn Uvi-Vis البليرات النانومترية
طريقة شوخرالسكي الامتصاص الضوئي طيوف ريمان و الأشعة ما تحت الحمراء المجهر الإلكتروني الماسح MEB (Sb2O3)نصف الناقل (Y2O3)أوكسيد
أنعراج الأشعة XIndex. décimale : 530 Physique Résumé : Preparation and structural and optical characterization of semiconductor nanocrystals
of Sb2O3 and Y2O3 oxide dispersed in a crystalline matrices of alkali halides KBr, KCl
and NaCl.
In this work antimony oxide (Sb2O3) and yttrium oxide (Y2O3) 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; on the other hand, the existence of the stable monoclinic phase crystallites (Y2O3) under atmospheric conditions reconfirms presence of (Y2O3) in nanoscale.
Studies by μ-Raman and IR confirmed the presence of chemical bonds Y—O and Sb—O in the different matrices.
The morphological study using the scanning electron microscope (SEM) shows that the micron grains scattered on the surface. The volume of these aggregates is due to the fact that the nanocrystals have a tendency to reduce its free energy (Gibbs energy) of surface.
The optical absorption and photoluminescence shows that the optical gaps of the crystallites (Sb2O3 and Y2O3) 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/BOU6378.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9379 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/6378 BOU/6378 Thèse Bibliothèque principale Thèses Disponible Documents numériques
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