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Bio-inspired materials for aplications in organic electronics
Meindl, Jiří ; Pospíšilík, Karel (referee) ; Krajčovič, Jozef (advisor)
The bachelor ‘s thesis is a literary research, which summarise perspective bioinspired materials for organic electronic applications. Mainly focused are bioinspired and biocompatible materials in this thesis. The main area of interest is synthesis, characterization and application of these semiconducting materials. The first part of the thesis is focused on indigo, 6,6‘-dibromoindigo and thiophen derivatives of isoindigo copolymers. The second part of the thesis is all about biocompatible materials and applications of these materials in bio-protonic electronics. Malein-chitosan is described in this part as role model substance of bio-protonic electronics.
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The synthesis and study of new derivatives of diketopyrrolopyrroles for organic electronics
Cigánek, Martin ; Maier, Lukáš (referee) ; Krajčovič, Jozef (advisor)
This diploma thesis describes organic pigments of diketopyrrolopyrroles (DDPs) possessing properties applicable in attractive and perspective areas of organic electronics and photonics. The modification of the DPP skeleton was performed by nucleophilic substitution by various alkyl chains and 5 series of DPP derivatives were prepared. The regioselectivity of N-alkylation and also the photophysical properties of the prepared derivatives were studied. A key product of this work is the N,N'-ethyladamantyl derivative of DPP, which exhibited ambipolar characteristic with excellent electron mobility of 0.2 cm2 V–1 s–1. Further, the -conjugation of the above-mentioned DPP derivative was extended by 1 and 2 thiophene units at positions 3,6 and the effect of this modification on optical properties of the resulting derivatives was investigated. A new modified N,N'-unsubstituted DPP derivative was also prepared. The last point of this thesis was the study of the incorporation of formyl functional groups into the skeleton of key N,N'-ethyladamantyl DPP derivative.
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IMPLEMETATION OF POLYCYCLIC SATURATED SYSTEMS IN ADVANCED SMART MOLECULES USABLE IN ORGANIC ELECTRONICS
Jančík, Ján ; Richtár, Jan (referee) ; Krajčovič, Jozef (advisor)
This essay deals with implementation of polycyclic saturated systems as bulky and very stable molecules, in advanced systems usable in organic electronics. It deals with theoretical aspects of structure and properties of polycyclic saturated systems, which based on available examples and literature are very perspective. Based on theoretical aspect in the first part of essay, the second part deals with synthesis of new molecule with incorporation of polycyclic saturated system usable in organic electronics. This part deals with all main intermediates synthetized via cross-coupling reactions.
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Study of Thiophene Oligo-copolymers: Synthesis and Optoelectronic Properties
Krajčovič, Jozef ; Mazal,, Ctibor (referee) ; Kapička, Vratislav (referee) ; Friedl, Zdeněk (advisor)
Thesis presents synthesis and study of thiophene monomers, oligomers and polymers. The new series of thieno[3,4-b]pyrazine copolymers based on 3-dodecylthiophene and pyrazine monomers were prepared by oxidative polymerization with FeCl3. The effective synthetic method for preparation of 3-alkylthiophenes and thiophene oligomers was developed by optimizing of Kumada cross-couplig. The mentioned method could be realized for multikilos scale with possibility of transfer to pilot plant production. The second part of thesis focuses on synthesis and study of new thiophene compounds, which consist of both 2,3-diazo-1,3-butadiene bridge with two terminal chromophores and two thiophene units linked together via -position by pyrazine or hydrazine bridge. Finally, the new type of regular alternating copolymer consists of 2,2´:5´,2´´-terthiophene-5,5´-dicarboxylic acid (TEDA) and polyethyleneoxide (PEO) was prepared. Formation of polymer nano-subunits as separated phases in solid state was confirmed by TEM.
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Synthesis and studies of novel difuranone heterocycles for optoelectronic applications
Szotkowski, Martin ; Ing. Jan Vyňuchal, Ph.D (referee) ; Krajčovič, Jozef (advisor)
Organic electronics is a progressive field of science that combines knowledge of many disciplines concerned with the study and application possibilities of organic molecules from both, the low-molecular segment as well as the oligomers and polymers. Such molecules are well recognizable by their excellent properties and variability of their structure. This thesis deals with properties, applications and brief research review of benzodifuranones and diketopyrrolopyrroles as the representatives of smart molecules. Furthermore various synthetic approaches to the preparation of both symmetrical and unsymmetrical benzodifuranones are described. Experimental part is focused on the development of hydroxy(thiophene-2-yl) acetic acid initial intermediate for the development of benzodifuranone analogues containing aromatic thiophene core.
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Synthesis and study of fluorinated organic materials for electronic and optoelectronic applications
Halaksa, Roman ; Pospíšilík, Karel (referee) ; Krajčovič, Jozef (advisor)
This essay deals with polyfluorinated aromatic compounds, as a strong electronacceptor units and with its incorporation into advanced monomeric and oligomeric systems. It deals with theoretical aspects of structure of mentioned building units, which shove, that it could be really progressive. Also examples of so far synthesized molecules, that can be found in literature, are included. The second part of essay deals with synthesis of main intermediates via Kumada cross-coupling and with synthesis of tetrafluorophenylene bridged thiophene trimmers via Stille cross-coupling.
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Preparation and study of the reactivity of a new series of N, N'-substituted diketopyrrolopyrrole (DPP) for organic photonics
Cigánek, Martin ; Vyňuchal, Jan (referee) ; Krajčovič, Jozef (advisor)
Currently, the major trend is the development of materials that could be used for transformation of solar energy into electrical energy. Organic photovoltaics studies this area of interest and especially in recent years increasingly tries to put functional materials of organic origin into practice. These materials belong to a group of "high performance pigments" due to their exceptional and relatively stable properties. One of the most important molecules are the diketopyrrolopyrroles (DPP) derivatives. The theoretical part of this bachelor work describes the organic electronics and photonics, DPP derivatives, various synthetic routes of DPP, properties of particular DPP derivatives and the dependence of their properties on the used substituents. There are described separation and analytical methods most commonly used in organic synthesis too. The experimental part describes the preparation of the backbone DPP containing thiophene units. The following are the modifications of DPP backbones with N,N‘-alkylation and N,N‘-arylation.
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Deposition of the thin films for applications of advanced oxidation processes using metal dopants
KRAJČOVIČ, Jan
The aim of this diploma thesis is deposition of TiO2 thin films onto different types and sizes of substrates, and some of these layers dope by iron or silver. During the work was range of TiO2 layers created using a method of physical vapor deposition namely magnetron sputtering. For these processes was chosen the Dreva ARC 400 Hard Material Coating Plant device. The main aim of these depositions was to attempt to create TiO2 thin films on a substrates of larger surface than its in average laboratory processes usual. For this purpose were TiO2 layers deposited onto square glass plates of side length 10 cm. For comparsion and analysis were also as a substrates used microscope slides and fragments of silicon wafers. These substrates were used for testing of photocatalytic activity and on surface morphology (SEM). The theoretical part of this thesis aims to a methods of deposition TiO2 layers and their characteristics. In the experimental part is the used coating equipment and parameters of each deposition process described. Further the characteristics and results of individual experiments are described.
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Windows Presentation Foundation and guitar
KRAJČOVIČ, Jan
This work deals with general overview about technology of Windows Presentation Foundation which is specialized for creating aplications with user friendly interface designated for operating systems Windows Vista (or later). By using technology of WPF author of this thesis created tutorial for playing guitar. Few of students will test the program. Main goal of this thesis is evaluation of testing student´s achieved results.
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