Synthesis, characterization and surface modification of titanium and zinc oxide nanostructures for nanotoxicity, visible light emission and photocatalytic studies
Başlık çevirisi mevcut değil.
- Tez No: 401585
- Danışmanlar: PROF. DR. SANJAY MATHUR
- Tez Türü: Doktora
- Konular: Kimya, Chemistry
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2013
- Dil: İngilizce
- Üniversite: Unıversıtat Zu Koln
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
Size dependent quantum confinement and differential characteristics of the anisotropic ZnO and TiO2 nanomaterials have attracted huge interest in the quest of new functional materials. In order to synthesize ZnO QD's for visible light emission applications, surface modulation for stability in dispersions and defect control at the surface is vitally important. Therefore long alkyl chain group (e.g. oleate) and biological molecule cysteine were used as vectors to regulate reactivity of the ZnO QD's and their visible light emission. Sol-gel chemistry serves as a versatile tool for the fabrication of controlled synthesis of quantum dots and to modify their properties for emission applications such as cell labeling, cell toxicity, solid-state light emission and to understand size/property correlation. High temperature liquid phase synthesis methods, namely heating up and hot injection method were applied toward the synthesis of anisotropic ZnO and TiO2 nanoparticles. Using different ligand concentrations and reaction conditions, semiconductor nanostructures of unusual geometrical shapes were synthesized and characterized. Hexagonal crystal growing habit of ZnO provided unusual geometrically distorted examples of the hexagonal geometry that have not been reported so far in the literature. Furthermore, TiO2 nanostructures with significant absorption in visible range of the solar spectrum were obtained by hot injection method and nitrogen doping. The rapid injection and decomposition of Ti-precursor and amine enabled to produce self assembled ball like and multibranched structures with remarkable visible range absorption. Utilization of different concentrations for the precursors provided the possibility of band gap engineering for the anisotropic TiO2 nanostructures.
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