Matériaux Nanohybrides À Large Bande Interdite
Author | : Aurore Said |
Publisher | : |
Total Pages | : 213 |
Release | : 2007 |
ISBN-10 | : OCLC:493964459 |
ISBN-13 | : |
Rating | : 4/5 (59 Downloads) |
Book excerpt: My thesis consists on designing dye-functionalized ZnO nanoparticles and studying their optical and morphological properties as well as the electronic interactions between inorganic ZnO and organic dye. We produced nanohybrids based on ZnO spheres and rods via two routes: Femtosecond laser ablation in liquid medium and Solution-based chemical procedures. Spherical ZnO of few nanometers created by laser ablation reveal by photoluminescence the effect of quantum confinement due to size reduction. The hemicallysynthesized ZnO rod-growth occurs by Oswald repining and Oriented attachment as noticed by HRTEM. Optical properties of the hybrids strongly depend on ZnO shapes as well as on dye type and concentration. We were able to engineer the band gap of the small ZnO particles in the nanohybrid matrices simply upon varying the dye concentration. We showed thus the quantum confinement effect through induced charged layers in the ZnO due to the adsorbed porphyrin dye.