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Optimalization of printing methods of organic semiconducting layers preparation
Ehlich, Jiří ; Vala, Martin (referee) ; Salyk, Ota (advisor)
Electrophysiological biosensors enables a novel way to measure electrical activity of biological structures both in-vitro and in-vivo and represents valuable alternative to current cellular activity measuring methods. Within this work we will be focusing on development of organic semiconductor (PEDOT:PSS) based Organic Electrochemical Transistors (OECTs) and optimization of material printing methods used in their development. These transistors are meant to be able to transfer electrochemical signals within the cell membrane to electrical signal. Such sensors should be used for cytotoxicity testing of chemicals and potential drugs on cardiomyocytes. Main benefits of OECTs are in their higher sensitivity thanks to their ability to locally amplify electric signals, better noise-signal ratio and outstanding biocompatibility. Their development is undemanding and inexpensive due material printing methods and materials processable at room temperatures.
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Optimization of electrochemical sensor for detection in microvolume
Gajdoš, Libor ; Pekárek, Jan (referee) ; Prášek, Jan (advisor)
This thesis describes optimization and modification of standard thick-film electrochemical sensor to be able to be used for detection in microvolumes. In the theoretical part, the thick film technology is described. The work is then focused on the wettability of surfaces followed by introduction to electrochemistry and electro-analytical methods. In the experimental part, screen-printing of various types of thick film pastes on ceramic substrates for determination of their wettability and the following modification of the sensors with thick-film paste and with Parylene vaporization can be found, as well as the basic electrochemical measurements in microvolume using the modified sensor. Finally the results are summarized in conclusion.
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Textile waveguide
Pelikán, Michal ; Schejbal, Vladimír (referee) ; Raida, Zbyněk (advisor)
Diploma thesis is focused on manufacturing process of waveguide filter. Thesis is divided to 8 chapters. There is summarized theory of possible execution of waveguide filter, used materials, their influence and risks during production. Then are described possible steps of realization and necessary relations for its design, simulation and also practical realization. At conclusion are summarized, compared and described reached results.
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Resinate pastes
Tomašák, Lukáš ; Jankovský, Jaroslav (referee) ; Řezníček, Michal (advisor)
The work is dedicated to the production of a thick film with resinate paste on a ceramic substrate based on a proposal test motive. It introduced the optimization of the workflow leading to the successful realization of the layer. Using an electron microscope, it is performed evaluation of the quality of resultant layer and analysis of the composition of the paste. In the last part of the work it is carried out measurements of temperature and electrical properties of resinate paste.
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Experimental Investigation of Integrated Thick Films
Čejka, Marek ; Jankovský, Jaroslav (referee) ; Szendiuch, Ivan (advisor)
This bachelor thesis deals with the theory of thick film technology. It describes implementation of thick layer integrated circuits, thick film technology, creen printing method. It includes basic electrical properties of thick layers. The aim of this work is the experimental work deals with the detection of current rating of conductors. The work includes the design of method of measuring and test structure.
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Electrical properties of thick film pastes measured in a wide temperature range
Gajdoš, Jiří ; Jankovský, Jaroslav (referee) ; Řezníček, Michal (advisor)
The aim of this master’s thesis is to investigate the electrical properties of various thick-film resistor pastes in a wider temperature range. The thesis mainly focuses on a change in electrical resistance depending on temperatures, which extend to the cryogenic region. To achieve this, there is an overview of the thick-film technology properties, major technological procedures, principles of resistive pastes conductivity, methods of electrical resistance measuring, possible errors in measurement and methods of their minimization. The content of this work is also familiar with the characteristics of a cryogenic station, on this foundation was proposed the measurement procedure and created thick-film circuits for this station. After measurement in the interval 10 K to 350 K, there are subsequently evaluated the data and explains the principles of the conductivity of used pastes.
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The direct writing of thick film pastes
Ištvánek, Jan ; Buršík, Martin (referee) ; Hladík, Jiří (advisor)
This work deals with the problem of the thick-film pastes and their printing. In the main chapter of this work, the realization of a workplace for thick-film pastes' printing is described. The construction of the realized plotter and the controlling electronics of the plotter is depicted in detail.In the following chapter, the console, through which the plotter is controlled via PC, and the CAD program, which serves for projecting of the motives printed, are described.In the final chapter of this work, the measured profiles of the paste printed for various settings of printing parameters and the photographs of the motives printed are stated.
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Material printing of ozone dosimeters
Petříčková, Zuzana ; Čeppan,, Michal (referee) ; Veselý, Michal (advisor)
This study presents various methods of measuring ozone and consolidates current state of knowledge in the field of disposable printed ozone dosimeters. The paper also identifies prospective dyes for preparation of ozone dosimeters available on the market. Information gathered from literature review was used to prepare dosimeters based on two different dyes. These were calibrated for screen printing technology and their sensitivity to ozone was optimized to achieve visual detectability. Prepared samples were observed and studied while being exposed to ozone. Then, long term mechanical and chemical properties of these were tested in order to identify appropriate conditions for storage.
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Study of the influence of the dielectrics on the optoelectronic properties of electroluminescent devices
Foldynová, Klára ; Novák, Vítězslav (referee) ; Vala, Martin (advisor)
This diploma thesis is studing the possibilities of influencing the optoelectric properties of printed light emitting panels, which work on the principle of electroluminescence excited by alternating electric field. The aim of this worrk is to monitor the influence od dielectric properties of electroluminescent phosphor binder on the targeted electroluminescence. In the theoretical part of this thesis, there are described principles of electroluminescence, suitable materials methods of characterization and preparation of panels using printing techniques. Experiment part contains electrical characterization of selected binders to determine their dielectric constants. Subsequently, printing pastes were formulated in different weight ratios of binder electroluminescent phosphor and model light-emitting panels were prepared. Optoelectric characterization was used to determine the change in irradiance. It was found that the dielectric properties of the binder significantly affect the resulting irradinace. It has same irradiance for a smaller amount od phosphor than with the binder with a low dielectric constant. The finding of this work can be used to improve the luminosity at the electroluminescent panels.
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Modification of inks for luminescent panels
Foldynová, Klára ; Dzik, Petr (referee) ; Vala, Martin (advisor)
This bachelor thesis deals with the study of the influence of luminescent additives on the features of printed electroluminescent elements. The goal of the thesis is to find a strategy for expanding the color spectrum of these elements while maintaining their functionality. An important step was the addition of additive to the basic luminescent layer of ZnS and its influence on emission of radiation. A change of color spectrum was proved by usage the U111 fluorophore and in particular the wavelength change and the intensity of the radiation on the input voltage and frequency were observed. The obtained results can be used in further studies to extend the knowledge of electroluminescence.
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