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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Experimental measurement of dielectric functions using ellipsometry
 Slovák, Radim ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
This work deals with the broad application of the spectral ellipsometry (SE) characterization method. It includes measurements of the dielectric function of thermal SiO2 and its thickness on a silicon substrate. Additionally, it presents diverse dielectric function of thin gold layer, highlighting its metallic and dielectric properties. The SE method is utilized for determining time-variable layers such as the growth rate of copper oxides. Furthermore, the dielectric function of the photoluminescent material CsPbBr3 is measured to identify quantum transitions within this perovskite material. Finally, a program in python is developed, enabling comprehensive analysis of ellipsometric data obtained via imaging microellipsometry on phase-change Sb2S3.
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Interaction of simple molecules with reducible oxides: model studies of H2O/CeOx and CO/CuOx
 Dvořák, Filip ; Mysliveček, Josef (advisor) ; Jirka, Ivan (referee) ; Švec, Martin (referee)
The thesis is focused on the investigation of fundamental catalytic properties of two model catalysts-CeOx/Cu(111) and CuOx/Cu(111)-by means of advanced surface science techniques. The investigations performed on CeOx are devoted to the study of the relationship between the surface structure and the surface activity of ceria. We develop the preparation method leading to growth of epitaxial CeOx(111) thin films with the adjustable morphological parameters-the step density and the ordering of surface oxygen vacancies. By using the CeOx(111) films with precisely controlled structure we identify the role of the step edges and of the oxygen vacancies in the interaction of water with ceria. The investigation performed on CuOx is focused on the microscopic characterization of the reduction process of Cu2O(111) on the molecular level directly under a near ambient pressure of CO. In direct microscopic study we identify the active initiation centers, the intermediate oxide phases, and the kinetics of the reduction reaction of Cu2O(111).
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