National Repository of Grey Literature 41 records found  previous11 - 20nextend  jump to record: Search took 0.00 seconds. 
Microelectrode arrays for mioelectronic
Bráblíková, Aneta ; Vala, Martin (referee) ; Salyk, Ota (advisor)
Organic electronic biosensors are developed as suitable devices that can transform electrochemical processes within the cell membrane into an electronic signal and enable to measure electrical activity of excitable cells and tissues both in vitro and in vivo and thus represent valuable alternative to current cell monitoring methods. In this work we focus on the fabrication of electrophysiological sensors based on organic semiconductors printed by the material printing method. Microelectrode arrays (MEAs) are active components of the device, which can monitore cellular activity and above that stimulating cells with electrical pulses. The proposed platform should be used for cytotoxicity of potential drugs especially on cardiac cells (cardiomyocytes). The experimental part focus on specific production processes of platforms, which were prepared in the laboraty with emphasis on biocompatibility and conductivity of device.
Preparation and characterization of perovskite solar cells
Juřík, Karel ; Salyk, Ota (referee) ; Pospíšil, Jan (advisor)
This work deals with the perovskite photovoltaic cells. The first part summarises the basic information about this technology and shows the most important milestones in its development. Following part includes the parameters required to characterise the electric properties of a photovoltaic cell and the assessment of its quality. The experimental part of this thesis aims to describe the influence of the annealing time of the perovskite active layer on the final efficiency of created solar cells. The best results were determined to be achieved with the annealing time of 90 minutes.
Generation of ozone by photochemical processes in CO2
Kucserová, Aneta ; Salyk, Ota (referee) ; Mazánková, Věra (advisor)
The bachelor thesis deals with the measurement of ozone concentration, which was produced by dielectric barrier discharge, corona discharge and UV lamp. The concentration of ozone in the air was also measured. The theoretical part deals with the basic properties of ozone, its use and determination of concentration by various methods. In the experimental part, ozone generation is described by the above-mentioned discharges.
Modelling of bioelectronic devices
Truksa, Jan ; Vala, Martin (referee) ; Salyk, Ota (advisor)
Tématem této práce je počítačové modelování organického elektrochemického tranzistoru (OECT). Pro vytvoření modelu bylo třeba vypočítat rozložení elektrického pole a koncentrace iontů elektrolytu. Výpočet byl proveden numericky pomocí metody konečných prvků. Bylo vypočítáno rozložení elektrického potenciálu na povrchu kanálu OECT, dále byly vypočítány změny vodivosti a výstupní proud OECT. Výpočty byly provedeny na osobním počítači pomocí komerčního softwaru COMSOL Multiphysics. Kvůli nedostatečnému výpočetnímu výkonu musel být model rozdělen na části a drasticky zjednodušen. Prezentované výsledky se liší od literatury, protože se nepodařilo správně modelovat saturaci tranzistoru. Odchylky od reálného chování OECT jsou pravděpodobně způsobeny zjednodušením modelu.
Optimization of printing of organic electronic devices printing for bioelectronics
Bráblíková, Aneta ; Hrabal, Michal (referee) ; Salyk, Ota (advisor)
This bachelor thesis is focused on optimization of printing of organic electronic devices printing for bioelectronics. The main goal of this bachelor thesis is a series of experiments devised to optimize semiconductive structures of PEDOT (semiconductive polymer) and description of the process used in the preparation of organic electrochemical transistors for biosensor by screen printing technology. The research focused on application of bioelectronics, printing technologies, conductive inks suitable for the preparation of OECTs (organic electrochemical tranzistors) and rheological properties of materials. Main conditions tested in the experimental part were temperature, stirring and additon of DMSO (dimethylsulfoxide) into a printing pasted. The evaluated parameters of materials were basic viscoelastic characteristics. At the ent of the thesis have been successfully designed the series of transistors to monitor cell cultures.
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.
Modelling of organic electrochemical transistors
Truksa, Jan ; Omasta, Lukáš (referee) ; Salyk, Ota (advisor)
The topic of this work is the making of a virtual model of a circular organic electrochemical transistor (OECT) and its electric field, and comparison of the computed results to a real system of rotationally symmetrical electrodes. The electric potential field in the transistor was modelled using the finite element method and the electric field and current field were determined using the results. Later, the electric potential field was mapped in a real system of aluminium electrodes, submerged in water. The electric field model of an unusually configured circular OECT is presented in this work. Due to insufficient computing capacity, the model had to be significantly simplified. The computed results agree with the experimentally determined potential field despite the simplification. The deviations of the model output characteristic from real OECT characteristic were caused by simplifying the model in respect to reality.
Characterization of a new deposition system for coating the fibers
Zvonek, Milan ; Salyk, Ota (referee) ; Čech, Vladimír (advisor)
Cieľom bakalárskej práce je charakterizácia depozičného systému na výrobu tenkých vrstiev. Teoretická časť je zameraná na literárnu rešerš o plazme, plazmovej polymerácií, tenkých vrstvách a ich analýzu pomocou infračervenej spektroskopie a spektroskopickej elipsometrie. Experimentálna časť popisuje použité materiály a aparaturu použitú na prípravu tenkých vrstiev pomocou plazmovej polymerácie. Posledná časť popisuje výsledky merania depozícií tenkých vrstiev a ich vyhodnotenie vzhľadom na depozičné podmienky.
Functional nanoparticles for plasmonic biosensors
Přítulová, Marie ; Salyk, Ota (referee) ; Vala, Martin (advisor)
This thesis aims to prepare functional gold nanoparticles (AuNPs) and use them in conjunction with a surface plasmon resonance (SPR) biosensor for highly sensitive detection of carcinoembryonic antigen (CEA). In this work, preparation of colloidal AuNPs was investigated and a three-step synthesis was optimized to yield spherical nanoparticles with a diameter of about 100 nm and smooth surface. The synthesized AuNPs were functionalized by a self-assembled monolayer of carboxy-PEG alkanethiols and streptavidin and characterized by UV/VIS spectroscopy and -potential method. Finally, the functionalized AuNPs were employed in sandwich assay for the sensitive detection of CEA and it was demonstrated that they can enhance sensor response to CEA by a factor of 100 compared to the direct detection of CEA.
Nanolayered Composites
Kontárová, Soňa ; Salyk, Ota (referee) ; Mistrík, Jan (referee) ; Čech, Vladimír (advisor)
Tato studie je zaměřena na základní výzkum tenkých vrstev plazmových polymerů a vliv depozičních podmínek na strukturu a vlastnosti jednotlivých vrstev a multivrstev připravených pomocí metody PE CVD. Jednotlivé vrstvy a multivrstvy a-SiC:H byly deponovány na křemíkové substráty z monomeru tetravinylsilanu (TVS) při různých výkonech v kontinuálním a pulzním režimu. Vrstvy byly rozsáhle zkoumány pomocí spektroskopické elipsometrie, nanoindentace, mikroskopie atomárních sil (AFM), rentgenové fotoelektronové spektroskopie (XPS), spektroskopie Rutherfordova zpětného rozptylu (RBS), rentgenové reflektivity, Fourierovy transformační infračervené spektroskopie (FTIR) a měření kontaktního úhlu, pro zjištění jejich optických, mechanických a chemických vlastností. Byl zkoumán a prokázán vliv depozičních podmínek na fyzikálně-chemické vlastnosti pp-TVS vrstev. Jednotlivé vrstvy byly v rámci po-depoziční úpravy vystaveny UV záření a byl zkoumán účinek stárnutí a vliv UV záření na jejich fyzikální a chemické vlastnosti. Multivrstevnaté struktury (plazmaticky polymerizované 2-vrstvy a 10-ti-vrstvy) s tloušťkou jednotlivých vrstev od 0,5 µm do 25 nm byly úspěšně deponovány a charakterizovány pomocí elipsometrické spektroskopie. Na základě získaných poznatků je možné připravit materiály s vlastnostmi upravenými podle požadavků pro využití v nanokompozitních aplikacích a optických zařízeních.

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