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Partager le résultat de cette recherche Interroger des sources externesEtude structurale et optique de films minces ZnO élaborés par voie physique et/ou chimique / Adel Taabouche
Titre : Etude structurale et optique de films minces ZnO élaborés par voie physique et/ou chimique Type de document : texte imprimé Auteurs : Adel Taabouche, Auteur ; A. Bouabellou, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2015 Importance : 107 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Sciences des matériaux Couche mince ZnO PLD Spray DRX AFM RBS M-lines UV-visible Effet Hall Thin films XRD Hall Effect ????? ????? ????????? ??????? ???? ??? ?????? ?????? ??????
??????? ??????? ??????? ??????? ?????? ??????? ??? ???Index. décimale : 530 Physique Résumé : In the present work, we have studied essentially the structural and optical properties of ZnO thin films elaborated using the physical technique s of the pulsed laser ablation (PLD) and the chemical method of the ultrasonic spray pyrolysis.
We have prepared undoped (ZnO) and cobalt-doped zinc oxide (CZO) thin films (Co: 3,5 at.%) by means of the PLD method. Synthesized films have been deposited on glass and silicon substrates heated at 450°C. The used source was a KrF eximer laser (248 nm, 25 ns, 2 J ⁄cm2). Different experimental techniques have been carried out to analyze the fabricated films: the X-ray diffraction (XRD), atomic force microscopy (AFM), Rutherford Backscattering spectrometry (RBS), UV-visible spectrophotometry, M-lines
spectroscopy and Hall effect.
While the ZnO films obtained by the ultrasonic spray technique have been deposited with different deposition times (10, 20, 30 min) on a glass substrate heated at 410 °C, and then they have characterized by XRD, AFM, UV-visible, M-lines and hall effect techniques.
The carried out study shows that all the prepared zinc oxide films have a hexagonal wurtzite-type structure and a preferentially oriented along the direction (002) confused with the c-axis perpendicular to the surface of the substrates. The grain sizes deducted from the XRD measurements vary between 24 and 40 nm. The optical coupling analysis realized by M-lines show that the ZnO films are monomode (for both TE and TM polarizations). However, the undoped ZnO film obtained by PLD is found to be two
guiding modes for TM. The films obtained have an optical transmission of 70 to 90% in the visible region of the spectrum and an optical band gap varying from 3.18 to 3.37 eV.
The electrical conductivity and the concentration of carriers, deduced from Hall effect measurements, are relatively low namely for the films prepared by spray pyrolysis technique.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/TAA6719.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9904 Etude structurale et optique de films minces ZnO élaborés par voie physique et/ou chimique [texte imprimé] / Adel Taabouche, Auteur ; A. Bouabellou, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 107 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Sciences des matériaux Couche mince ZnO PLD Spray DRX AFM RBS M-lines UV-visible Effet Hall Thin films XRD Hall Effect ????? ????? ????????? ??????? ???? ??? ?????? ?????? ??????
??????? ??????? ??????? ??????? ?????? ??????? ??? ???Index. décimale : 530 Physique Résumé : In the present work, we have studied essentially the structural and optical properties of ZnO thin films elaborated using the physical technique s of the pulsed laser ablation (PLD) and the chemical method of the ultrasonic spray pyrolysis.
We have prepared undoped (ZnO) and cobalt-doped zinc oxide (CZO) thin films (Co: 3,5 at.%) by means of the PLD method. Synthesized films have been deposited on glass and silicon substrates heated at 450°C. The used source was a KrF eximer laser (248 nm, 25 ns, 2 J ⁄cm2). Different experimental techniques have been carried out to analyze the fabricated films: the X-ray diffraction (XRD), atomic force microscopy (AFM), Rutherford Backscattering spectrometry (RBS), UV-visible spectrophotometry, M-lines
spectroscopy and Hall effect.
While the ZnO films obtained by the ultrasonic spray technique have been deposited with different deposition times (10, 20, 30 min) on a glass substrate heated at 410 °C, and then they have characterized by XRD, AFM, UV-visible, M-lines and hall effect techniques.
The carried out study shows that all the prepared zinc oxide films have a hexagonal wurtzite-type structure and a preferentially oriented along the direction (002) confused with the c-axis perpendicular to the surface of the substrates. The grain sizes deducted from the XRD measurements vary between 24 and 40 nm. The optical coupling analysis realized by M-lines show that the ZnO films are monomode (for both TE and TM polarizations). However, the undoped ZnO film obtained by PLD is found to be two
guiding modes for TM. The films obtained have an optical transmission of 70 to 90% in the visible region of the spectrum and an optical band gap varying from 3.18 to 3.37 eV.
The electrical conductivity and the concentration of carriers, deduced from Hall effect measurements, are relatively low namely for the films prepared by spray pyrolysis technique.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/TAA6719.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9904 Exemplaires
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Titre : Élaboration et caractérisation d’un dépôt de couches minces d’oxyde de zinc par spray pyrolyse Type de document : texte imprimé Auteurs : Salah Boulmelh, Auteur ; Lynda Saci, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 103 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Couche mince oxyde de zinc (ZnO) Spray Pyrolyses Diffraction rayons X Spectroscopie Raman UV-visible Méthode des quatre pointes Thin film zinc oxide (ZnO) Spray Pyrolysis X-ray diffraction Raman
spectroscopy four-points method ??????? ??????? ????? ????? ???? ????????? ?????? ??????? ??????? ????? ???? ???? UV-VISIndex. décimale : 621 Electronique Résumé : The proposed topic in the context of this thesis focuses on the study, elaboration and characterization of pure zinc oxide (ZnO) thin films deposited on glass substrates by pyrolytic spraying technique mostly called SPRAY PYROLYSIS.
It's the effect of temperature and molarities on the physicochemical properties of ZnO thin films obtained by the spray process that interest us in this study.
Note that these deposits were developed at various temperatures (300 to 450°C) and molarities (0.05 to 0.4 M), using Zn (C2 H3 O2)2 • 2H2O an organometallic precursor.
The structural characterization by X-ray diffraction and Raman spectroscopy showed that the deposited films have a hexagonal polycrystalline wurtzite type structure whose
preferential crystallographic orientation is obtained according to the (100) plane.
Thus, we found an average crystallite size between 18 and 30 nm.
The optical characterization of the films was carried out using the UV-Visible spectroscopy in the spectral range from 200 to 800 nm. The results shows, that the transparence films are around 15 to 95%. The transmittance spectra analysis allowed us to determine the gap (3.16 to 3.3 eV) and the disorder of our estimated films (65.8 meV). These results are consistent with those obtained in the literature. We also conducted an electrical characterization of our samples by the four-point method. The deducted values of the pure zinc oxide electric conductivity are ranging from 8.15 to 80 (Ω.cm)
-1 at various temperatures and molarities. Thus, the deposited films have more conductive character for the deposit of ZnO in M=0.2 M and at 350°C.
In conclusion, the results show that films with low molarities (≤0,2 M) can be used as buffer layers in photovoltaic cells, while those with high molarities (˃0.2 M) are more promoters candidates for applications as gas sensors.
Diplôme : Magistère En ligne : ../theses/electronique/BOU6797.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10036 Élaboration et caractérisation d’un dépôt de couches minces d’oxyde de zinc par spray pyrolyse [texte imprimé] / Salah Boulmelh, Auteur ; Lynda Saci, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2015 . - 103 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Couche mince oxyde de zinc (ZnO) Spray Pyrolyses Diffraction rayons X Spectroscopie Raman UV-visible Méthode des quatre pointes Thin film zinc oxide (ZnO) Spray Pyrolysis X-ray diffraction Raman
spectroscopy four-points method ??????? ??????? ????? ????? ???? ????????? ?????? ??????? ??????? ????? ???? ???? UV-VISIndex. décimale : 621 Electronique Résumé : The proposed topic in the context of this thesis focuses on the study, elaboration and characterization of pure zinc oxide (ZnO) thin films deposited on glass substrates by pyrolytic spraying technique mostly called SPRAY PYROLYSIS.
It's the effect of temperature and molarities on the physicochemical properties of ZnO thin films obtained by the spray process that interest us in this study.
Note that these deposits were developed at various temperatures (300 to 450°C) and molarities (0.05 to 0.4 M), using Zn (C2 H3 O2)2 • 2H2O an organometallic precursor.
The structural characterization by X-ray diffraction and Raman spectroscopy showed that the deposited films have a hexagonal polycrystalline wurtzite type structure whose
preferential crystallographic orientation is obtained according to the (100) plane.
Thus, we found an average crystallite size between 18 and 30 nm.
The optical characterization of the films was carried out using the UV-Visible spectroscopy in the spectral range from 200 to 800 nm. The results shows, that the transparence films are around 15 to 95%. The transmittance spectra analysis allowed us to determine the gap (3.16 to 3.3 eV) and the disorder of our estimated films (65.8 meV). These results are consistent with those obtained in the literature. We also conducted an electrical characterization of our samples by the four-point method. The deducted values of the pure zinc oxide electric conductivity are ranging from 8.15 to 80 (Ω.cm)
-1 at various temperatures and molarities. Thus, the deposited films have more conductive character for the deposit of ZnO in M=0.2 M and at 350°C.
In conclusion, the results show that films with low molarities (≤0,2 M) can be used as buffer layers in photovoltaic cells, while those with high molarities (˃0.2 M) are more promoters candidates for applications as gas sensors.
Diplôme : Magistère En ligne : ../theses/electronique/BOU6797.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10036 Exemplaires
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Titre : Recherche et détermination structurale de métabolites secondaires de deux plantes Algériennes de la famille des lamiaceae Type de document : texte imprimé Auteurs : Sabrina Mohamadi, Auteur ; Samir Benayache, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 334 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : UV-visible SM-MR RMN,1H 13C cosy noesy HSQC HMBC ABTS ORAC DPPH ??? ??????? ?????? ??????? ?????? ??? ????????? ??????? ?????? ????? ????? ??????? ?????? ?????????? Index. décimale : 540 Chimie et sciences connexes Résumé : This work deals with the structural determination and biological evaluation of natural substances isolated from two species of the Lamiaceae family (Salvia aegyptiaca and Saccocalyx satureioides). These family and the genus Salvia are known for their rich antioxidant compounds including polyphenols and flavonoids.
The phytochemical study of the aerial parts of these species allowed after extraction, separation and purification the isolation and identification of nineteen compounds from Saccocalyx satureioides and fourteen compounds from Salvia aegyptiaca .These compounds were identified by the combination of spectroscopic methods including : UV-visible absorption spectroscopy, high resolution HR-MS mass spectrometry, 1H and 13C-NMR and two-dimensional experiments (COSY, NOESY, HSQC, and HMBC) The isolated compounds were :
A flavonol : Quercetin (14).
Fifteen flavones : 7-methyl- sudachitin (8), Sideritiflavone (17), Luteolin (25),
Apigenin (27), Salvigenin(28), 4',7-dimethylapigenin (29), 5-hydroxy 3', 4', 6,7-
tetraméthoxyflavone(30), IsoIscutellarein-7-O-allosyl (1→2) glucoside (11),Isoscutellarein-7-O-[ β-D-allopyranosyl-(1→2)]-6’’-O-acetyl- β-D-glucopyranoside
(12), Isoscutellarein-7-O-[6”’-O-acetyl- β-D-allopyranosyl-(1→2)]- β-Dglucopyranoside (13) , Isoscutellarein -7-O-[6‴-O -acetyl-β-D-allopyranosyl (1→2) ]-
6″-O-acetyl-β-D-glucopyranoside. (15), Apigenin- 7-O-(6’’-trans-p-coumaroyl- β -Dglucopyranoside (16), Luteolin 7-O glucoside (21), Apigenine 7-O glucoside (22),
Diosmin (23).
Sixteen phenolic compounds : Piceol(1), Vanillin (2), Ferulic aldehyde (3), 3,3’-bis (3,4-
dihydro-4-hydroxy-6,8-dimethoxy-2H-1-benzopyran) (4), 3,3’-bis (3,4-dihydro-4-
hydroxy-6-methoxy-2H-1-benzopyran) (5), Dimethylcaffeic acid (6), Balanophonin (7),
Caffeic acid (9), p-coumaric acid (10), 4-methoxyphenol, Salicylic acid, Caffeic acide
(18), Vanillic acid (19), Syringic acid (20), Rosmarinic acid (24), Methyl rosmarinate
(26).
A furocoumarin : 6`,7`-dihydroxybergamottin(31)The study of the chemical composition of essential oil of Salvia aegyptiaca species growing in
Algeria was characterized by a high level of sesquiterpene fraction and a moderate level of
monoterpene components. β-caryophyllene (10.2%), Selina-4,11-diene (9.7%), bornyl acetate
(8.5%), β-gurjunene (7.6%), germacrene D (7.0 %) and β-caryophyllene oxide (6.2%) were the
major components of this essential oil.
This work led to the publications of two articles subject entitled “ On-line screening and
identification of antioxidant phenolic compounds of Saccocalyx satureioides Coss. et Dur.” and
“ Chemical composition of the Essential oil of Salvia aegyptiaca” . A third paper is in
preparation and will be devoted to the phytochemical and biological study of Salvia aegyptiaca.
Diplôme : Doctorat En ligne : ../theses/chimie/MOH6938.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10289 Recherche et détermination structurale de métabolites secondaires de deux plantes Algériennes de la famille des lamiaceae [texte imprimé] / Sabrina Mohamadi, Auteur ; Samir Benayache, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 334 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : UV-visible SM-MR RMN,1H 13C cosy noesy HSQC HMBC ABTS ORAC DPPH ??? ??????? ?????? ??????? ?????? ??? ????????? ??????? ?????? ????? ????? ??????? ?????? ?????????? Index. décimale : 540 Chimie et sciences connexes Résumé : This work deals with the structural determination and biological evaluation of natural substances isolated from two species of the Lamiaceae family (Salvia aegyptiaca and Saccocalyx satureioides). These family and the genus Salvia are known for their rich antioxidant compounds including polyphenols and flavonoids.
The phytochemical study of the aerial parts of these species allowed after extraction, separation and purification the isolation and identification of nineteen compounds from Saccocalyx satureioides and fourteen compounds from Salvia aegyptiaca .These compounds were identified by the combination of spectroscopic methods including : UV-visible absorption spectroscopy, high resolution HR-MS mass spectrometry, 1H and 13C-NMR and two-dimensional experiments (COSY, NOESY, HSQC, and HMBC) The isolated compounds were :
A flavonol : Quercetin (14).
Fifteen flavones : 7-methyl- sudachitin (8), Sideritiflavone (17), Luteolin (25),
Apigenin (27), Salvigenin(28), 4',7-dimethylapigenin (29), 5-hydroxy 3', 4', 6,7-
tetraméthoxyflavone(30), IsoIscutellarein-7-O-allosyl (1→2) glucoside (11),Isoscutellarein-7-O-[ β-D-allopyranosyl-(1→2)]-6’’-O-acetyl- β-D-glucopyranoside
(12), Isoscutellarein-7-O-[6”’-O-acetyl- β-D-allopyranosyl-(1→2)]- β-Dglucopyranoside (13) , Isoscutellarein -7-O-[6‴-O -acetyl-β-D-allopyranosyl (1→2) ]-
6″-O-acetyl-β-D-glucopyranoside. (15), Apigenin- 7-O-(6’’-trans-p-coumaroyl- β -Dglucopyranoside (16), Luteolin 7-O glucoside (21), Apigenine 7-O glucoside (22),
Diosmin (23).
Sixteen phenolic compounds : Piceol(1), Vanillin (2), Ferulic aldehyde (3), 3,3’-bis (3,4-
dihydro-4-hydroxy-6,8-dimethoxy-2H-1-benzopyran) (4), 3,3’-bis (3,4-dihydro-4-
hydroxy-6-methoxy-2H-1-benzopyran) (5), Dimethylcaffeic acid (6), Balanophonin (7),
Caffeic acid (9), p-coumaric acid (10), 4-methoxyphenol, Salicylic acid, Caffeic acide
(18), Vanillic acid (19), Syringic acid (20), Rosmarinic acid (24), Methyl rosmarinate
(26).
A furocoumarin : 6`,7`-dihydroxybergamottin(31)The study of the chemical composition of essential oil of Salvia aegyptiaca species growing in
Algeria was characterized by a high level of sesquiterpene fraction and a moderate level of
monoterpene components. β-caryophyllene (10.2%), Selina-4,11-diene (9.7%), bornyl acetate
(8.5%), β-gurjunene (7.6%), germacrene D (7.0 %) and β-caryophyllene oxide (6.2%) were the
major components of this essential oil.
This work led to the publications of two articles subject entitled “ On-line screening and
identification of antioxidant phenolic compounds of Saccocalyx satureioides Coss. et Dur.” and
“ Chemical composition of the Essential oil of Salvia aegyptiaca” . A third paper is in
preparation and will be devoted to the phytochemical and biological study of Salvia aegyptiaca.
Diplôme : Doctorat En ligne : ../theses/chimie/MOH6938.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10289 Exemplaires
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Titre : Elaboration des Couches minces du Semiconducteur ZnO dopées au Cobalt et étude de leurs propriétés structurales, optiques et électriques. Type de document : texte imprimé Auteurs : Ahmed Reda Khantoul, Auteur ; Miloud Seffari, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 108 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Oxyde de zinc Cobalt Couches minces Dip-Coating Sol-Gel DRX MEB AFM Raman UV-Visible photoluminescence Zinc oxide cobalt thin films SEM ????? ????? ?????? ???? ???????? ???????-??????? ????? ???? ?????? ??????? ?????? ?????????? ?????? ???? ????? ?????? ?????? ????? ?????? ??????? ?????? ?????? ??? ?????????-??????? ????? ?????? ?????? Index. décimale : 530 Physique Résumé : The present work consists in the elaboration and characterization of the undoped and cobalt-doped ZnO with different concentrations of cobalt (Co) (0.5, 1, 5 and 10% in weight) thin films in order to improve the structural, morphological, optical and electrical properties of ZnO. The samples were prepared using the Sol-Gel method and deposited on glass substrates by the Dip-coating ""Dipping-Drawing"" technique. Structural haracterization showed the formation of ZnO of hexagonal structure (wurtzite) with a preferential orientation according to plane (002) and made it possible to determine the nanometric size of the crystallites. The SEM and AFM images revealed the nanometric character of our layers. Raman scattering confirmed the results of the XRD, namely the formation of ZnO with an hexagonal structure (wurtzite). UV-visible spectroscopy has shown that our layers have a transparency, in the visible, which varies between 80 and 98%. It has shown also that the gap decreases with the increase in doping. The hotoluminescence of the films showed ultraviolet (UV) and visible emissions related to defects. The codoping of aluminum to cobalt allowed us also to improve the structural and optical properties.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/KHA7383.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11033 Elaboration des Couches minces du Semiconducteur ZnO dopées au Cobalt et étude de leurs propriétés structurales, optiques et électriques. [texte imprimé] / Ahmed Reda Khantoul, Auteur ; Miloud Seffari, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 108 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Oxyde de zinc Cobalt Couches minces Dip-Coating Sol-Gel DRX MEB AFM Raman UV-Visible photoluminescence Zinc oxide cobalt thin films SEM ????? ????? ?????? ???? ???????? ???????-??????? ????? ???? ?????? ??????? ?????? ?????????? ?????? ???? ????? ?????? ?????? ????? ?????? ??????? ?????? ?????? ??? ?????????-??????? ????? ?????? ?????? Index. décimale : 530 Physique Résumé : The present work consists in the elaboration and characterization of the undoped and cobalt-doped ZnO with different concentrations of cobalt (Co) (0.5, 1, 5 and 10% in weight) thin films in order to improve the structural, morphological, optical and electrical properties of ZnO. The samples were prepared using the Sol-Gel method and deposited on glass substrates by the Dip-coating ""Dipping-Drawing"" technique. Structural haracterization showed the formation of ZnO of hexagonal structure (wurtzite) with a preferential orientation according to plane (002) and made it possible to determine the nanometric size of the crystallites. The SEM and AFM images revealed the nanometric character of our layers. Raman scattering confirmed the results of the XRD, namely the formation of ZnO with an hexagonal structure (wurtzite). UV-visible spectroscopy has shown that our layers have a transparency, in the visible, which varies between 80 and 98%. It has shown also that the gap decreases with the increase in doping. The hotoluminescence of the films showed ultraviolet (UV) and visible emissions related to defects. The codoping of aluminum to cobalt allowed us also to improve the structural and optical properties.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/KHA7383.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11033 Exemplaires (1)
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Titre : Contribution à l'étude de substances tinctoriales : Casd'azo-composés chromogènes Type de document : texte imprimé Auteurs : Mustapha Benathmane ; Université Mentouri, Editeur scientifique ; Abdelkader Bouchoul, Directeur de thèse Année de publication : 2005 Importance : 162 f. Note générale : 01 Disponible à la salle de recherche 02 Disponibles au magazin de la bibliothèque centrale 01 CD Langues : Français (fre) Tags : Synthèse Diffraction Rx Copulation Azoiques Chromophores Solvatochromie UV-Visible Index. décimale : 540 Chimie et sciences connexes En ligne : ../theses/chimie/BEN4317.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3730 Contribution à l'étude de substances tinctoriales : Casd'azo-composés chromogènes [texte imprimé] / Mustapha Benathmane ; Université Mentouri, Editeur scientifique ; Abdelkader Bouchoul, Directeur de thèse . - 2005 . - 162 f.
01 Disponible à la salle de recherche 02 Disponibles au magazin de la bibliothèque centrale 01 CD
Langues : Français (fre)
Tags : Synthèse Diffraction Rx Copulation Azoiques Chromophores Solvatochromie UV-Visible Index. décimale : 540 Chimie et sciences connexes En ligne : ../theses/chimie/BEN4317.pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=3730 Exemplaires
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