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Showing result 1 - 5 of 22 swedish dissertations matching the above criteria.

2. 1. Highly Efficient CIGS Based Devices for Solar Hydrogen Production and Size Dependent Properties of ZnO Quantum Dots

   Author : T. Jesper Jacobsson; Tomas Edvinsson; Laurence Peter; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; ZnO; Nanoparticles; Quanum Dots; Size Dependent Properties; Hematite; CIGS; Solar Water Splitting; Hydrogen Production; PEC; Photoelectrochemical cells; PV-electrolysis; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Abstract : Materials and device concepts for renewable solar hydrogen production, and size dependent properties of ZnO quantum dots are the two main themes of this thesis.ZnO particles with diameters less than 10 nm, which are small enough for electronic quantum confinement, were synthesized by hydrolysis in alkaline zinc acetate solutions. READ MORE

4. 2. Conjugation in Organic Group 14 Element Compounds : Design, Synthesis and Experimental Evaluation

   Author : Rikard Emanuelsson; Henrik Ottosson; Rik Tykwinski; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; conjugation; conductance; electronic structure; Group 14 elements; hyperconjugation; molecular electronics; organosilicon chemistry; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

   Abstract : This thesis focuses on the chemical concept of conjugation, i.e., electron delocalization, and the effect it has on electronic and optical properties of molecules. READ MORE

5. 3. Nanostructured ZnO and metal chalcogenide films for solar photocatalysis

   Author : Taha Ahmed; Tomas Edvinsson; Jiefang Zhu; Mats Johnsson; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; photocatalysis; zinc oxide; quantum dots; nanorods; quantum confinement; low-dimensional; cathodic electrodeposition; Raman spectroscopy; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Abstract : The increasing demand for clean energy and safe water resources has driven the development of efficient and sustainable technologies. Among these technologies, photocatalysis using semiconducting materials has emerged as a promising solution for both solar hydrogen generation and water purification. READ MORE

6. 4. 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

7. 5. Oxygen Vacancy Chemistry in Ceria

   Author : Jolla Kullgren; Kersti Hermansson; Shluger Alex; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ceria; Density Functional Theory; Oxygen storage; Nano crystals; Sulfur poisoning; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Abstract : Cerium(IV) oxide (CeO2), ceria, is an active metal oxide used in solid oxide fuel cells and for the purification of exhaust gases in vehicle emissions control. Behind these technically important applications of ceria lies one overriding feature, namely ceria's exceptional reduction-oxidation properties. READ MORE