| Titre : | Elaboration and Characterization of Undoped and Cu doped TiO2 thin films by Sol-Gel (Dip-Coating) |
| Auteurs : | Nafissa ZERGUINE, Auteur ; Abdelouahed Chala, Directeur de thèse |
| Type de document : | Monographie imprimée |
| Editeur : | Biskra [Algérie] : Faculté des Sciences Exactes et des Sciences de la Nature et de la Vie, Université Mohamed Khider, 2021 |
| Format : | 1 vol. (62 p.) / couv. ill. en coul / 30 cm |
| Langues: | Français |
| Mots-clés: | couches minces, Cu-TiO2, Dip coating, propriétés structurelles, propriétés optiques |
| Résumé : |
Des couches minces de dioxyde de titane pur et dopé au cuivre ont été déposées sur des substrats de verre par la technique sol-gel dip coating. Les couches ont été recuites à 400 °C pendant 3 h et caractérisées par diffraction des rayons X (XRD), microscope électronique à balayage (MEB) et Spectroscopie UV-visible. L'effet du dopage au cuivre à différentes concentrations sur les propriétés structurelles, morphologiques et optiques des couches minces de TiO2 a été étudié. Les résultats XRD ont révélé que les couches minces pures et dopées (Cu-TiO2) ont une phase anatase avec une orientation préférentielle le long du plan (101). Les micrographies SEM montrent que la surface des couches était vaguement agglomérée avec des fissures et des grains plus petits et irréguliers. L'analyse par EDX révèle la présence de Ti, O et Cu dans les couches préparées. La bande interdite d'énergie directe et indirecte des couches minces pures et dopées (Cu-TiO2) a varié entre 2,9 et 3,8 eV. |
| Sommaire : |
Dedication Acknowledgment Contents General Introduction……………………………………………………………………………01 Chapter I: Bibliographical Study I – 1 – Transparent Conductive Oxides and its properties………………………………… …...03 I – 1 – 1 – Application of TCOs……………………………………………………………….04 I – 2 – Titanium dioxide………………………………………………………………………...05 I – 3 – Titanium dioxide properties……………………………………………………………..05 I – 3 – 1 – TiO2 Structural properties…………………………………………………………05 I – 3 – 2 – TiO2 Optical properties……………………………………………………………07 I – 3 – 3 – TiO2 Electrical properties………………………………………………………….07 I – 4 – Doping of TiO2………………………………………………………………………….08 I – 4 – 1 – Copper properties…………………………………………………………………..08 I – 5 – TiO2 Applications………………………………………………………………….........09 I – 5 – 1 – Pigment…………………………………………………………………………….09 I – 5 – 2 – Photocatalysis………………………………………………………………….......10 I – 5 – 3 – Gas Sensor…………………………………………………………………………12 I – 5 – 4 – Dye-sensitized solar cells (DSSC)…………………………………………………14 I – 6 – Deposition methods of Cu doped TiO2 thin films……………………………………...15 I – 6 – 1 – Hydrothermal method………………………………………………………….......15 I – 6 – 2 – Atmospheric-pressure thermal plasma method…………………………………….16 I – 6 – 3 – Inert gas condensation (IGC) method………………………………………….......16 I – 6 – 4 – Sparking method……………………………………………………………….......17 I – 6 – 5 – Sol–gel dip coating method………………………………………………………..17 I – 6 – 6 – Spray pyrolysis method……………………………………………………………18 Chapter II: Sol-Gel deposition method and characterization techniques II – 1 – Sol-Gel deposition method……………………………………………………………..20 II – 1 – 1 - Chemical reactions of Sol-Gel method…………………………………………...21 II – 1 – 1 – 1 - Hydrolysis reaction………………………………………………………….21 II – 1 – 1 – 2 - Condensation reaction……………………………………………………….22 II – 1 – 2 – Different Sol-Gel deposition methods……………………………………………23 II – 1 - 2 – 1 - Dip-coating…………………………………………………………………..23 II – 2 - Experimental procedure………………………………………………………………...24 II – 2 – 1 - Preparation of substrate…………………………………………………………...24 II – 2 – 1 – 1 - Choose of substrate………………………………………………………….24 II – 2 – 1 – 2 - Cleaning of the substrate…………………………………………………….24 II – 2 – 2 - Preparation of the solutions……………………………………………………….24 II – 2 – 3 – Deposition of thin films…………………………………………………………..25 II – 2 – 3 – 1 - Experimental conditions……………………………………………………..26 II – 2 – 3 – 2 - Adhesion test (tape test)……………………………………………………..27 II – 2 – 3 – 3 – Annealing…………………………………………………………………...28 II – 3 – Characterization techniques of thin films………………………………………………28 II – 3 – 1 – Structural characterization using X-Ray Diffraction (XRD)…………………….28 II – 3 – 2 – Morphological characterization using Scanning Electron Microscopy (SEM)….31 II – 3 – 3 – Chemical composition using Energy dispersive X-ray spectroscopy (EDX)…...32 II – 3 – 4 – Optical characterization using UV-Visible spectrophotometer………………….32 II – 3 – 4 – 1 - Absorption coefficient………………………………………………………34 II – 3 – 4 – 2 - Optical band gap……………………………………………………………34 II – 4 – Thickness measurement…………………………………………………………….......35 II – 4 – 1 - Surface profilometer……………………………………………………………...35 Chapter III: Results and Discussion III – 1 – Morphological characterization……………………………………………………….39 III – 2 – Energy dispersive X-ray spectroscopy (EDX) characterization………………………42 III – 3 – Structural characterization…………………………………………………………….47 III – 4 – Thickness measurement……………………………………………………………….48 III – 5 – Optical characterization……………………………………………………………….49 III – 5 – 1 – Transmittance spectrums………………………………………………………..49 III – 5 – 2 – Band gap energy………………………………………………………………...51 General Conclusion……………………………………………………………………………..56 References………………………………………………………………………………………58 Abstract…………………………………………………………………………………………62 |
| Type de document : | Mémoire master |
Disponibilité (1)
| Cote | Support | Localisation | Statut |
|---|---|---|---|
| MPHY/587 | Mémoire master | bibliothèque sciences exactes | Consultable |
