Search for dissertations about: "zno surface thesis"

Showing result 1 - 5 of 78 swedish dissertations containing the words zno surface thesis.

2. 1. ZnO Quantum Dots : Size Dependent Optical, Vibrational and Photoelectrochemical Properties

   Author : Jesper Jacobsson; Tomas Edvinsson; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; ZnO; nanoparticels; quantum dots; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Abstract : This thesis is devoted to quantum dots of ZnO in the size regime 2.5-10 nm.The focus is directed towards their size dependent properties with specialemphasis on the optical, vibrational and photocatalytic properties. The particleswere synthesized by hydrolysis in alkaline zinc acetate solution. READ MORE

4. 2. Growth and Characterization of ZnO Nanocrystals

   Author : Leif KE Ericsson; Kjell O Magnusson; Lars SO Johansson; Hanmin M Zhang; Omer Nour; Karlstads universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; ZnO; Nanocrystals; Surface physics; XPS; SEM; AES; AFM; STM; Physics; Fysik;

   Abstract : The understanding of surfaces of materials is of crucial importance to all of us. Considering nanocrystals (NCs), that have a large surface to bulk ratio, the surfaces become even more important. Therefore, it is important to understand the fundamental surface properties in order to use NCs efficiently in applications. READ MORE

5. 3. Surface and Interface Studies of ZnO using Reactive Dynamics Simulation

   Author : David Raymand; Kersti Hermansson; Daniel Spångberg; Kai Nordlund; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; catalysis; molecular dynamics; force-fields; metal oxide; ZnO; dynamical effects on reactivity; Inorganic chemistry; Oorganisk kemi; Kemi med inriktning mot oorganisk kemi; Chemistry with specialization in Inorganic Chemistry;

   Abstract : About 90% of all chemicals are produced with the help of catalysts, substances with the ability to accelerate reactions without being consumed. Metal oxides play a prominent role in catalysis, since they are able to act reversibly in many chemical processes. Zink oxide (ZnO) is used to catalyse a number of industrially important reactions. READ MORE

6. 4. Growth of ZnO/GaN distributed Bragg reflectors by plasma-assisted molecular beam epitaxy

   Author : David Adolph; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Oxides; GaN; distributed Bragg reflector; MBE; molecular beam epitaxy; ZnO; Nitrides; DBR;

   Abstract : This thesis describes epitaxial growth of ZnO/GaN distributed Bragg reflectors by hybrid plasma-assisted molecular beam epitaxy on GaN(0001). The unique hybrid approach employed the same growth chamber for continuous growth of both ZnO and GaN without exposing the layers to the ambient conditions. READ MORE

7. 5. Chemistry and Physics of Cu and H2O on ZnO Surfaces : Electron Transfer, Surface Triangles, and Theory

   Author : Matti Hellström; Kersti Hermansson; Peter Broqvist; Daniel Spångbeg; Jörg Behler; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; catalysis; density functional theory; SCC-DFTB; band-filling correction;

   Abstract : This thesis discusses the chemistry and physics of Cu and H2O on ZnO surfaces, based primarily on results from quantum chemical calculations. The underlying context is heterogeneous catalysis, where Cu/ZnO-mixtures are used in the industrial synthesis of methanol and in the water gas shift reaction. READ MORE