|
|
Biomedical applications of polycaprolactone nanofibrous mats
Dvořák, Pavel ; Přibyl,, Jan (referee) ; Zajíčková, Lenka (advisor)
The diploma thesis deals with the treatment of polycaprolactone (PCL) nanofibers. PCL fibers were subjected to the deposition of plasma amine polymers in a low pressure pulsed radiofrequency capacitively coupled discharge using cyclopropylamine monomer (CPA). Collagen as an extracellular matrix (ECM) protein was immobilized and cell proliferation on the modified nanofiber surface was monitored. Untreated PCL fibers were also subjected to the deposition of an antibacterial copper layer, and the fibers were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and energy dispersive spectroscopy (EDX).
|
|
|
Optimization of thin films of metal oxide materials
Vítek, Jiří ; Šimonová, Lucie (referee) ; Šubarda, Jiří (advisor)
This thesis is focused on the description of the method of reactive sputtering of thin films. Currently, there are many ways how to create thin films and there are many applications of thin films in various industrial sectors. In this paper at the first are listed the issue of thin films, followed by an overview of the deposition techniques and of the chemical analysis of deposited thin films. It also describes the four-point measurement method of sheet resistance, mechanical test of adhesion and optical properties. At the end of the theoretical part are described the material composition of the deposited films. The goal of the practical part is to optimize the deposition process of the mixed layer of indium tin oxide (In2O3: SnO2) and contribute to the overall understanding of the influence of annealing on the layer. There were created six series of samples with that applied layers. First, the work focused on examining of the influence of annealing on the throughput in the whole measuring range, and then comparing the series due to the transmittance in the visible light spectrum. Furthermore were compared the value of sheet resistance of unannealed and subsequently annealed samples.
|
|
|
Deposition and analysis of AlCrN coatings
Drásalová, Kateřina ; Juliš, Martin (referee) ; Klakurková, Lenka (advisor)
The topic of this thesis is the deposition process and methods of quality assessment of AlCrN surface coatings produced by methods of (i) magnetron sputtering, (ii) magnetron sputtering with arc enhanced glow discharge, and (iii) high power magnetron sputtering with the movable magnetic field. The main focus is placed on categorizing properties of the produced coatings based on the production method (which vary in the ionization level). Qualities of the surface coatings are assessed by adhesion and cohesion parameters testing of coarseness using AFM (Atomic Force Microscopy), depth measuring using a calotest, measuring internal tension using the Bent Strip Method and Instrumented indentation test for hardness.
|
|
|
Creating themes thin-film methods
Ondráček, Michal ; Šimonová, Lucie (referee) ; Šubarda, Jiří (advisor)
The master’s thesis deals with the theory of thin film technology, especially creating these layers. The work includes the distribution of vacuum deposition techniques for physical (PVD) and chemical (CVD). The main aim is to create a theme in different ways of implementation by using magnetron sputtering device, and these motives evaluated in terms of the quality of sputtering.
|
|
|
Deposition of thin metal layers by vacuum magnetron sputtering device
Rogozhnikova, Mariia ; Hylský, Josef (referee) ; Strachala, Dávid (advisor)
This bachelor’s thesis is focused on description of magnetron sputtering device NP 12 for the thin metal layers forming. In this work is mentioned the issue of metal layers, is given an overview of the methods of their forming and description of magnetron sputtering. Practical part of this thesis describes creation of the NP 12 sputtering device controlling instructions and creation of ten working samples. Copper, aluminum, and titanium layers were sputtered on a glass and silicon substrate bases. An appropriate processing parameters have been defined experimentally. The conclusion of this final work gives analyzes of surface flatness and purity of the sputtered layers using AFM and SEM measurements methods.
|
|
|
Thermal stability of sputtered yttrium oxide layers
Kršňák, Jiří ; Boušek, Jaroslav (referee) ; Hégr, Ondřej (advisor)
This work deals with behavior of deposited yttrium oxide thin film after heat stress. Within solution thin yttrium oxide films were deposited at silicon substrates, which were exposed to various cycles of heat stress. Tested structures were investigated before and after heat stress in term of surface topography stability with the hepl of electron microscopy.
|
|
|
Epitaxial growth and characterization of metamagnetic nanoparticles for biomedical applications
Motyčková, Lucie ; Gröger,, Roman (referee) ; Arregi Uribeetxebarria, Jon Ander (advisor)
Magnetické nanočástice představují perspektivní prostředek pro široké množství biomedicínských aplikací v neustále se rozvíjejících oblastech diagnostiky a léčebné terapie. Využití magnetických nanočástic z metamagnetických materiálů by mohlo poskytnout výrazný přínos například z hlediska zlepšení ovladatelnosti biologických subjektů uvnitř lidského těla. Tato práce se zabývá růstovými mechanismy a magnetickými vlastnostmi nanočástic ze slitiny železa s rhodiem (FeRh) ukotvených na substrátu MgO. Slitina FeRh byla vybrána pro její specifickou fázovou přeměnu z antiferomagnetické do feromagnetické fáze nastávající v blízkosti pokojové teploty, což umožňuje ovládání magnetických vlastností nanočástic v teplotním rozsahu blízkém lidskému tělu. Prezentované nanostruktury jsou vyráběny magnetronovým naprašováním využívajícím přístup samouspořádání “bottom–up”. Morfologie a magnetické chování připravených nanostruktur jsou vyšetřovány pomocí mikroskopie atomových a magnetických sil, které umožňují získat prostorové rozložení feromagnetických a antiferomagnetických domén v jednotlivých nanoostrůvcích.
|
|
|
Design, production and characterization of the adhesive layer for the deposition of ta-C coating by the magnetron sputtering method
Drásalová, Kateřina ; Juliš, Martin (referee) ; Klakurková, Lenka (advisor)
The topic of this thesis is improving the adhesion parameters of the DLC (diamond-like carbon) coating, specifically for its non-hydrogenated form ta-C (tetra amorphous carbon), for the deposition of ta-C coating by the magnetron sputtering with a central rotating cathode method. A possible solution is the creation of a chrome adhesive layer between this coating and the substrate. Effects of the adhesive layer on the coating are controlled by change settings of a process parameters as temperature, voltage, or time of deposition. The aim of the experiment was the production of such an adhesive layer that will increase the adhesion of the ta-C coating without worsening its other properties. The resulting properties of the deposited coating were analysed using a calotest for thickness measuring, Rockwell test and scanning electron microscopy (SEM) to assess adhesion and cohesion parameters, instrumented penetration tests to determine hardness and bent-strip method to calculate internal stress. By evaluating the prepared samples, depending on the resulting useful properties of the coating, the best deposition parameters were determined.
|
|
|
Příprava tenkých funkčních TCO vrstev a jejich analýza pro elektrochemickou senzoriku
ŠIMEROVÁ, Radka
The aim of this thesis is study, preparation and investigation of thin films from the family of conductive oxides, which are transparent in the visible region of the spectrum, in order to create electrochemically active transparent electrodes with multipurpose applicability. The layers were prepared by a magnetron sputtering using low-temperature plasma discharge. Indium doped Tin Oxide (ITO), which belongs to the mentioned group of oxides, was deposited on silicon and glass substrates in a variety of conditions in the deposition system. The attention was paid to the dependence of the electrochemical activity of the produced films on their thickness and ex-situ thermal annealing during the optimization of deposition conditions. However, the main motivation of the research was to investigate the influence of methods focused on energy supply to the deposited layers, i.e. the influence of working gas pressure, the presence of in-situ annealing during the deposition, and the different power sources connected to the magnetron. In order to investigate the electrochemical properties of the layers, a system for measuring cyclic voltammetry, one of the most common electrochemical methods with high sensitivity, was implemented.
|
|
|
Thermal stability of Ti/Ni multilayer thin films
Václavík, R. ; Zábranský, L. ; Souček, P. ; Sťahel, P. ; Buršík, Jiří ; Fořt, Tomáš ; Buršíková, V.
In this work, thermal stability and mechanical properties of Ti/Ni multilayer thin films were studied. The multilayer thin films were synthesised by alternately depositing Ti and Ni layers using magnetron sputtering. The thickness of constituent layers of Ti and Ni varied from 1.7 nm to 10 nm, and one coating was deposited by simultaneous sputtering of both targets. Single crystalline silicon was used as a substrate. The effects of thermal treatment on the mechanical properties were studied using nanoindentation and discussed in relation to microstructure evaluated by X-ray diffraction. Annealing was carried out under low-pressure conditions for 2 hours in the range of 100-800 degrees C.
|
guest ::
