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Growth of organic semiconductor on heteromolecular layer
Mrhačová, Petra ; Redondo, Jesús (referee) ; Procházka, Pavel (advisor)
Tato diplomová práce se zabývá přípravou a analýzou heteromolekulárních vrstev obsahujících molekuly kyseliny 1,3,5-benzentribenzoové (BTB) nebo kyseliny 4,4'-bifenyl-dikarboxylové (BDA) spolu s pentacenovými molekulami na substrátu Ag(111). Uspořádání molekul v takových vrstvách závisí na několika faktorech, jako je množství deponovaných molekul na povrchu, pořadí, v jakém jsou molekuly deponovány, a míra deprotonace jejich karboxylových skupin. Následně byl studován růst organického polovodiče pentacenu na heterovrstvě obsahující BTB a pentacenové molekuly. Bylo zjištěno, že růst probíhá ve formě velkých ostrůvků, které se rozrůstají dendriticky. Tyto ostrůvky však nejsou kompaktní, ale skládají se z malých molekulových klastrů. Všechny vytvořené vrstvy byly zkoumány v podmínkách ultravysokého vakua (UHV) pomocí nízkoenergetického elektronového mikroskopu (LEEM) a rastrovacího tunelového mikroskopu (STM).
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Interaction of water vapor with epitaxial layers of cerium dioxide
Morvai, Orsolya ; Šmíd, Břetislav (advisor) ; López-Roso Redondo, Jesús Rubén (referee)
This thesis investigates the interaction between water and cerium oxide, which, due to its oxygen storage activity, could be widely used in nanomedicine, catalysis, and environmental applications. Despite extensive research, a fundamental understanding of how water interacts with cerium oxide under ambient conditions has been lacking. The study utilizes scanning tunneling microscopy, near-ambient pressure X-ray photoelectron spectroscopy, and the study of water dissociation on stoichiometric CeO2(111)/Pt(111) thin films with controlled step density. The results demonstrate the identification of three adsorption species and reveal that the dissociation kinetics depend on step density. These findings provide new insights into the role of water in cerium oxide interactions under operando conditions.
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Formation, Functionalization and Characterization of 2D Materials on Crystalline Supports
López-Roso Redondo, Jesús Rubén ; Švec, Martin (advisor) ; Gonzáles Pascual, César (referee) ; Mysliveček, Josef (referee)
In this thesis, the growth of 2D materials, in particular graphene and FeO2 on crystalline supports, is studied by a multitude of surface-sensitive techniques. The mechanisms of graphene growth in ultra-high vacuum and high Ar pressure are explored, and a simple device for the manufacturing of high-quality, monocrystalline graphene on SiC is described. The electronic and chemical properties of B and N dopants on graphene are characterized by means of STM/AFM with CO-functionalized tips and supported by DFT calculations. The chemical interaction of a probe molecule (FePc) with doped graphene is also investigated. The long-standing controversy of the so-called "biphase" reconstruction of α - Fe2O3(0001) is resolved by the discovery of a complete FeO2 overlayer in this phase. The structure of this overlayer is investigated by means of STM, LEEM and DFT calculations. A thorough description of the routes to obtain single phases over the whole surface of α - Fe2O3(0001) is provided.
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