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Application of two-dimensional layers of transition metal dichalcogenides in plasmonics
Kocourková, Monika ; Hrtoň, Martin (referee) ; Kvapil, Michal (advisor)
Two-dimensional layers of transition metal dichalcogenides are materials with some very intriguing properties, such as the existence of room-temperature stable excitons in visible and near-IR spectrum. Their integration into plasmonic systems allows enhancement of their photoluminescence, absorption, etc., which can be used in various applications. This thesis begins with an overview of the basic terminology and fundametal principles behind these materials and hybrid systems. The theoretical part then focuses on some plasmon-excitonic system examples. Practical part of this thesis is aimed at simulating and optimizing two different plasmon-excitonic systems using monolayer molybdenum disulphide and tungsten disulphide.
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The D-A and pi-pi interactions and their use in self-assembly
Rejchrtová, Blanka ; Starý, Ivo (advisor) ; Kotora, Martin (referee)
The D-A and π-π Interactions and Their Use in Self-Assembly Due to their well-defined shape, size and properties gold nanoparticles represent an advantageous platform for the study of non-covalent interactions between ligands anchored to their surface both in solution and in monolayers or thin films. The aim of this thesis was the synthesis of ligands for gold nanoparticles bearing an anchoring group at one end and a planar π-electron rich pyrene unit at the other. Six structurally variable ligands were prepared differing in the pyrene substitution pattern and the spacer between the aromatic part and the acetylated thiol function. Furthermore, a synthetic pathway leading to extended π-electron systems (both electron rich and electron poor) such as hexabenzocoronene derivatives and its fragments was explored. The key steps in the synthesis of these compounds are the cyclization reactions of alkynes leading to polycyclic intermediates and their ensuing cyclodehydrogenation (Scholl reaction). All of the prepared ligands and their intermediates were characterized by spectroscopic methods. The structure of the key hexakis(pentafluorosulfanyl-phenyl)benzene was confirmed by single crystal X-ray crystallography. The prepared ligands bearing a pyrene unit were deacetylated and anchored to the surface of...
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Application of two-dimensional layers of transition metal dichalcogenides in plasmonics
Kocourková, Monika ; Hrtoň, Martin (referee) ; Kvapil, Michal (advisor)
Two-dimensional layers of transition metal dichalcogenides are materials with some very intriguing properties, such as the existence of room-temperature stable excitons in visible and near-IR spectrum. Their integration into plasmonic systems allows enhancement of their photoluminescence, absorption, etc., which can be used in various applications. This thesis begins with an overview of the basic terminology and fundametal principles behind these materials and hybrid systems. The theoretical part then focuses on some plasmon-excitonic system examples. Practical part of this thesis is aimed at simulating and optimizing two different plasmon-excitonic systems using monolayer molybdenum disulphide and tungsten disulphide.
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Towards lateral interactions within self-organized monomolecular layers
Staněk, Jan ; Baše, Tomáš (advisor) ; Bastl, Zdeněk (referee)
This work aimed at the utilization of chemical principles for stabilization of self-assembled monolayers (SAMs) of carboranethiol derivatives on a flat gold surface. Ideas employing surface confined coordination complex formation and dipole-dipole intermolecular interactions were outlined and the respective literature survey was compiled. Preliminary experiments were carried out to test for their feasibility and surfaces modified with self assembled monolayers proved very sensitive to reaction conditions ordinarily used for bulk synthesis. The chemical sensitivity of the studied surfaces, the necessity of using appropriate surface-sensitive analytical techniques and the depth of the problem initially defined made this task both advanced and challenging. The formation of intermolecular coordination complexes with ω-carboxylated SAMs of meta-carborane-9-thiol was chosen to answer those issues, extending the previous work of the author on carboxylated carboranethiol isomers presented in his bachelor thesis. Concepts different of those based on coordination chemistry are briefly discussed as well, but more as prospects for future work and to present this work in a broader context to which it belongs. Characterization of molecules assembled on a surface in a single layer requires surface sensitive...
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The D-A and pi-pi interactions and their use in self-assembly
Rejchrtová, Blanka ; Starý, Ivo (advisor) ; Kotora, Martin (referee)
The D-A and π-π Interactions and Their Use in Self-Assembly Due to their well-defined shape, size and properties gold nanoparticles represent an advantageous platform for the study of non-covalent interactions between ligands anchored to their surface both in solution and in monolayers or thin films. The aim of this thesis was the synthesis of ligands for gold nanoparticles bearing an anchoring group at one end and a planar π-electron rich pyrene unit at the other. Six structurally variable ligands were prepared differing in the pyrene substitution pattern and the spacer between the aromatic part and the acetylated thiol function. Furthermore, a synthetic pathway leading to extended π-electron systems (both electron rich and electron poor) such as hexabenzocoronene derivatives and its fragments was explored. The key steps in the synthesis of these compounds are the cyclization reactions of alkynes leading to polycyclic intermediates and their ensuing cyclodehydrogenation (Scholl reaction). All of the prepared ligands and their intermediates were characterized by spectroscopic methods. The structure of the key hexakis(pentafluorosulfanyl-phenyl)benzene was confirmed by single crystal X-ray crystallography. The prepared ligands bearing a pyrene unit were deacetylated and anchored to the surface of...
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