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Application of low temperature plasma jet systems for the deposition of thin films
Hubička, Zdeněk ; Kment, Štěpán ; Olejníček, Jiří ; Čada, Martin ; Straňák, V. ; Klusoň, J. ; Tichý, M. ; Klusoň, Petr
The low pressure DC pulsed or RF pulsed modulated hollow cathode plasma jets worked on the principle of the reactive sputtering of the hollow cathode usually in the gas mixture of Ar + O2 or N2. The DC pulsed power supplier was applied with combination of the RF source for the plasma jets generation. It was clearly demonstrated that properties of TiO2 and TiO2:N films significantly depended on the plasma parameters. First, the produced films were characterized with the aid of a number of methods (AFM, SEM, XRD, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–vis spectrometry). Further, the films were judged in terms of their specific optical functionality to generate photocurrents upon being illuminated with spectrally well defined narrow light beams. The parameters of the chemically reactive plasma in the jets were determined using the time-resolved Langmuir probe system. The measurement of the ion energy distribution function was performed by means of the RFA.
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Mechanical properties of optical thin films
Tomáštík, J. ; Čtvrtlík, R. ; Šebestová, Hana ; Schovánek, Petr ; Jankůj, J. ; Hrabovský, Miroslav
Mechanical properties of optical thin films and coatings are very important for their reliability, because they are often exposed to rough conditions in service. Mechanical attributes of films, that determine their behavior, are in the center of interest. In this paper, mechanical properties of optical thin films deposited on various types of glass substrates were examined. Assessment of such properties was performed using instrumented nanoindentation (hardness, elastic modulus, elastic and plastic work done by indentation) and scratch test (critical loads corresponding to the onset of specific failure). The failure modes of thin films were discussed.
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Physical principle of lasers
Chmelíčková, Hana
Laser as generator of monochromatic, coherent radiation with low divergence is widely used in industrial systems that are equipped by manipulating devices, processing gasses and safety elements.
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Thin Functional Films of TiO2 Nanoparticles
Morozová, Magdalena ; Klusoň, Petr ; Hejda, S. ; Kment, Štěpán ; Šolcová, Olga
Magnetron Sputtering and the Modulated Hollow Cathode Plasma Jet Sputtering. As chemical method the sol-gel process carried out in the templating environment as dip-coating and piezo-jet printing was employed. The produced films differed in many structural characteristics and also in their photoelectrochemical behaviour, as the primary sought function. The produced layers were described by means of atomic force microscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, Raman spectroscopy, ellipsometry and profilometry. Then the films were used as electrodes in photoelectrochemical experiments.
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Photo-Electrochemical Properties of Hierarchical Nanocomposite Structure: Carbon Nanofibers/TiO2/ZnO Thin Films
Hubička, Zdeněk ; Kment, Štěpán ; Gregora, Ivan ; Čada, Martin ; Olejníček, Jiří ; Klusoň, Petr ; Petras, D. ; Krýsa, J. ; Jastrabík, Lubomír ; Dytrych, Pavel
In this contribution we report on photoelectrochemical functionality of the multilayers system consisting of CNF's/photoactive anatase TiO2/ conductive ZnO thin films. Recently the thin phthalocyanines films has been prepared and studied individually.
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Laser scanning confocal microscopy for 3D surface mapping
Lapšanská, Hana ; Schovánek, Petr
This contribution introduces a modern microscopic method and shows possible measurements and analysis of wire saw machined glass pieces. The main objective of realized measurements is to identify possible defects and its depth to propose eventual additional treatment. We are looking for the optimal technological procedure of grooved glass stick-on supports preparation. Such supports are used for the very thin accurate optical components production which is executed in our workshops and laboratories. Surface quality of the support significantly influences the quality of produced optical components.
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FEM simulation of thermal differences in semi finished glass pieces during the cooling
Havelková, Martina ; Schovánek, Petr
Semi finished glass pieces are moulded in the furnace to template forms not only to fit their shape but also to reduce internal stresses. Thermal differences are unwanted and have to be minimized in the cooling procedure of the glass pieces. Simulations of various types and sizes of shaping forms and complex model cooling were accomplished. The aim of these simulations was to optimise geometric parameters, clamping conditions and material of the form, so that thermal differences at glass are minimized during the cooling.
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