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Hydrogen Peroxide Senzing By Dichalkogenide Quantum Dots Prepared By Lpe
Zahradníček, Radim
Signalling molecules such as hydrogen peroxide (H2O2) play crucial role in cellular metabolism. Under pathological conditions, the cell is unable to control enzymatic conversion H2O2 into water and oxygen. This fail in cell metabolism could lead to damage of cell. Thus produced H2O2 is presented at a nanomolar scale and currently there is a lack of suitable electrochemical sensors for its sensitive detection. Modification of screen printed electrodes (SPE) with 2D-nanomaterial quantum dots prepared by Liquid Phase Exfoliation (LPE). MoS2, MoSe2, WS2 and WSe2 compounds were used for this purpose. Such modified electrodes were characterized and optimized for hydrogen peroxide detection.
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Proposal or the new layout of the "toolshop"
Varhaník, Matúš ; Zahradníček, Radim (referee) ; Strejček, Jan (advisor)
The aim of this work was creating the draft of stamping tool workshop layout. Our first task was to define the product range. Afterwards we were able to identify the technological and machinery equipment necessary for the execution of orders. The paper further discusses the need of human resources as well as the needs of the production, administrative and social areas. We propose possible technological solutions considering the range of production, the amount of machinery and personnel capacities. The next step is to optimize the layout, using tools such as material flow and continuity of operations. Not only safety at work but also the ergonomics of the proposed workplace is important for the final draft. The result of our project is to develop the final layout of stamping tool workshop containing the economic evaluation of the investment plan.
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Conversion of manually controlled milling machine into CNC
Orság, Petr ; Zahradníček, Radim (referee) ; Mouralová, Kateřina (advisor)
In the first part of this thesis, there is a short research dealing with modernization of old-type machines. There is also given a description of main types of milling machines. The next part includes characterization and parameters of the milling machine, that is the subject to the thesis. There are to be found designes and calculations of selected units in the following part. In consideration of the character of the thesis there are not given calculations of all units. The last part deals with economical evaluation.
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Production of flanges using the procedure PPAP , and ISO 9001
Prokeš, Tomáš ; Zahradníček, Radim (referee) ; Mouralová, Kateřina (advisor)
In the first part of this thesis is described implementation of quality management system in a small company according to ISO 9001. Next part is about production process by method PPAP. In this section is solved primarily ISO 9001 standard, statistical control of production and certification company according to requirements of ISO 9001. Second part is focused on mass production of flange by using the company facilities Kovobrábění Sobotka. In the end of thesis are reflected weaknesses of production. In the conclusion is described technical and economic evaluation of implementation QMS and machining sample parts.
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Graphene-on-silicon Schottky junction solar cells
Zahradníček, Radim ; Drbohlavová,, Jana (referee) ; Mach, Jindřich (advisor)
This diploma thesis concerns itself with fabrication and characterization of Schottky solar cell on the graphene/silicon interface. Schottky solar cells were manufactured using a front collector electrode from gold, silver and carbon. On the graphene/silicon interface of the Schottky solar cell an interlayer of Al2O3 or SiO2. For the purpose of IV characterization of the manufactured Schottky solar cell a measuring apparatus was assembled.
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Preparation and characterization of MoS2 thin films
Tomková, Renáta ; Zahradníček, Radim (referee) ; Bartoš, Miroslav (advisor)
This thesis deals with topological insulators, which are described by the quantum spin Hall effect, as well as on semiconductors, where the band structure of semiconductors and more specifically mentioned unipolar transistor MOSFET is explained. There are also mentioned primarily 2D materials and in particular of MoS2. Topic focuses on its structure, the electric properties, the use and preparation by using micromechanical exfoliation. In the last chapter it is described how to prepare MoS2 structures and their analysis. Structural properties of this material were measured by the AFM and Raman spectroscopy. The experimental part there are illustrative photograph of MoS2 taken with an optical microscope and spatial structures created by AFM.
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Preparation of graphene layers by various methods and characterization of their properties
Zahradníček, Radim ; Bartošík, Miroslav (referee) ; Lišková, Zuzana (advisor)
This bachelor's thesis deals with the production of graphene by different methods. Graphene was prepared by mechanical exfoliation and chemical methods. Graphene oxide (GO) was first prepared by modified Hummers method and disolved the solution in isopropyl alcohol. It was subsequently reduced by photoreduction, UV radiation and thermal reduction. Produced graphene samples were characterized using optical microscopy, electron microscopy, atomic force microscopy, Raman spectroscopy and X$-$ray photoelectron spectroscopy. Measurement results and evaluation of production quality of graphene are shown in this work.
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