National Repository of Grey Literature 32 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Preparation of ppHMDSO Thin Films in Capacitively Coupled RF Glow Discharges under Dusty Plasma Conditions
Homola, V. ; Buršíková, V. ; Kelar, L. ; Kelarová, Š. ; Stupavska, M. ; Peřina, Vratislav
The deposition of organosilicone thin films from mixture of hexamethyldisiloxane (HMDSO) and oxygen by using capacitively coupled R.F. glow discharges under dusty plasma conditions was investigated. High resolution topography and mechanical property maps of the prepared films were acquired by using atomic force microscopy techniques. The chemical bond and composition of the deposited films were analyzed by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The mechanical properties of the films were studied using quasistatic as well as dynamic nanoindentation tests and their surface free energies were evaluated by means of contact angle measuring technique using several testing liquids exhibiting various surface tensions. The thermal stability of the films was studied using thermal desorption spectroscopy. Neural network modelling was used to study the effect of plasma parameters on the hardness of ppHMDSO films
Study of mechanical properites of nanostructured polymer coatings prepared using plasma enhanced chemical vapor deposition
Buršíková, V. ; Homola, V. ; Peřina, Vratislav
The aim of the present work was to deposit transparent polymer SiOxCyHz protective coatings from hexamethyldisiloxane/ oxygen mixtures in capacitively coupled glow discharge. The coatings prepared under dusty plasma conditions showed nanocomposite character. Complex characterization of the local mechanical properties was carried out on the prepared samples from nano to microscale using indentation techniques. The coatings were very elastic, they exhibited high elastic recovery and low plastic deformation even at indentation depths approaching the coating thickness.
Studium mechanických vlastností gradovaných amorfních DLC povlaků deponovaných PECVD
Buršíková, V. ; Stoica, A. ; Sobota, Jaroslav ; Grossman, Jan ; Fořt, Tomáš ; Klapetek, P. ; Buršík, Jiří ; Peřina, Vratislav ; Bláhová, O.
For optimisation of performance of the coating there is necessary to optimise the following materials parameters: the elastic modulus, hardness, surface strength, film fracture toughness and film-substrate adhesion. We proposed to protect the substrate surface with graded coating, which has monotonically graded elastic modulus and Poisson's ratio.
Funkčnost amorfních uhlíkových povlaků s obsahem křemíku deponovaných použitím nízkotlaké PECVD
Sobota, Jaroslav ; Buršíková, V. ; Fořt, T. ; Grossman, Jan ; Klapetek, P. ; Buršík, Jiří ; Franta, D. ; Peřina, Vratislav
Amorphous carbon films with silicon content were deposited using low pressure PECVD. The films were optimised for deposition on steel substrates. To evaluate the impact resistance of graded amorphous carbon films in dynamic loading wear applications an impact test has been used.
Amorfní tenké vrstvy Ag-Sb-S připravené radiofrekvenčním magnetronovým naprašováním
Gutwirth, J. ; Wágner, T. ; Drašar, Č. ; Beneš, L. ; Vlček, M. ; Hrdlička, M. ; Frumar, M. ; Schwarz, J. ; Tichá, H. ; Peřina, Vratislav
Thin Ag-Sb-S films were prepared by RF magnetron sputtering as potential candidates for rewritable optical data storage films. There were prepared polycrystalline bulks of AgSbS2. Composition and homogeneity of these bulks were checked. Targets for RF magnetron sputtering were prepared from pulverized bulks by hot pressing technique. Targets were characterized the same way as bulks. Composition and homogeneity of prepared thin films were characterized by SEM-EDX and RBS/ERDA, amorphous/crystalline character was studied by XRD. Optical properties (spectral dependence of refractive index) were evaluated on basis of UV-Vis-NIR spectroscopy and variable angle spectral ellipsometry (VASE). Crystallization abilities were traced by thermal dependence of optical transmission of prepared thin films.
Vlastnosti vrstev na elektroerodovaném povrchu implantátů
Peřina, Vratislav ; Havránek, Vladimír ; Starý, V. ; Bačáková, Lucie ; Zemek, Josef ; Jirka, Ivan ; Jehlička, J. ; Vorlíček, Vladimír ; Fencl, J.
Plasma sprayed and in oil electroeroded implant surfaces were studied by various surface analytical techniques including cell adhesion.
Výzkum postupu pro přípravu aktivních a pasivních vlnovodů v polovodičích
Prajzler, V. ; Špirková, J. ; Oswald, J. ; Peřina, Vratislav ; Hüttel, I. ; Hamáček, J. ; Machovič, V. ; Burian, Z.
The magnetron sputtering was used to fabricate RE doped GaN layers fabricated by magnetron sputtering on various substrate using a gaseous mixture of nitrogen and argon as precursors. The doping of the GaN films with RE occurred simultaneously with the sputtering process when placing the metal RE pellets or RE powder onto the Ga2O3 target. The amount of the incorporated erbium increased with increasing weight of the RE pellets or RE powder. We observed photoluminescence emission at 1 550 nm due to the 4I13/2 → 4I15/2 transition under excitation at 488 nm and 980 nm.

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