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Národní úložiště šedé literatury Nalezeno 7 záznamů.  Hledání trvalo 0.01 vteřin. 
Diamond thin film development and SIMS analysis on various substrates
 Vincze, A. ; Michniak, P. ; Haško, D. ; Michalka, M. ; Varga, Marián ; Dobročka, E.
The contribution shows the possibilities of the diamond growth on various substrates. The thin film samples were prepared using hot filament CVD. The analysis of the diamond coatings were done by various methods. SEM, XRD, Raman spectrometry and SIMS were done in order to characterize the samples. The results of the diamond thin films are discussed.
Úplný záznam
Influence of nucleation and methane concentration on buckypapers exposed to hot filament chemical vapor deposition process
 Varga, Marián ; Kotlár, M. ; Vretenár, V. ; Ižák, Tibor ; Šoltýs, J. ; Kromka, Alexander ; Veselý, M.
In this article we investigate the nanocomposite material formation, particularly the deposition of nanocrystalline diamond film on buckypaper (BP) substrate. The buckypapers were prepared from single-wall carbon nanotubes (SWCNT) mixture produced by laser ablation method. We have investigated the influence of the nucleation and methane concentration on buckypapers exposed to the hot filament chemical vapor deposition process.
Úplný záznam
Diamond chemical vapor deposition
 Kromka, Alexander
Present paper reviews growth of diamond thin films by various chemical vapor deposition processes. Basic characteristics and common features of processes are pointed out with a respect to quality of grown films and standard process parameters. Novel and non-standard diamond syntheses techniques are briefly discussed.
Úplný záznam
Influence of methane concentration on diamond film morphology and growth rate
 Ižák, Tibor ; Babchenko, Oleg ; Kromka, Alexander ; Potměšil, Jiří ; Hruška, Karel
In this study we investigated the influence of methane concentration on the diamond film growth. The experiments were carried out in focused microwave chemical vapour deposition system. The methane concentration was varied from 0.5% to 10 % of CH4 in H2 atmosphere. The final film morphology, chemical composition and growth rate were investigated by scanning electron microscopy (SEM), Raman spectroscopy and optical reflectance measurement. We observed, that increasing of CH4 concentration enhances the growth rate, but at the expense of the diamond film quality.
Úplný záznam
Influence of CO.sub.2./sub. concentration on diamond film morphology in pulsed linear antenna microwave plasma CVD system
 Domonkos, M. ; Ižák, Tibor ; Babchenko, Oleg ; Kromka, Alexander ; Hruška, Karel
The diamond films were deposited in a pulsed linear antenna microwave plasma system. The influence of CO2 addition into the standard CH4/H2 gas mixture on the diamond film morphology was investigated. The concentration of CO2 varied from 0% up to 80% in CO2/CH4/H2 gas mixture. The film morphology, the growth rate and the ratio of sp3/sp2 carbon bonds were investigated. It was found that increasing of CO2 concentration resulted in enhanced growth rate (from 20 up to 36 nm/h). However, at very high CO2 concentrations (>40%) dominates etching instead of growth process. Moreover, we found that increasing of CO2 enhances the diamond film quality.
Úplný záznam
Deposition of carbon nanotubes by MW PECVD method
 Babchenko, Oleg ; Davydova, Marina ; Hruška, Karel ; Kromka, Alexander
The report is about the growth of carbon nanotubes from CH4/H2 gas mixture applying linear antenna plasma system. We investigate growth of nanotubes in the different type of plasma and by using different catalyst particles.
Úplný záznam
Pulsed linear antenna microwave plasma – a step ahead in large area material depositions and surface functionalization
 Kromka, Alexander ; Babchenko, Oleg ; Ižák, Tibor ; Potocký, Štěpán ; Davydova, Marina ; Neykova, Neda ; Kozak, Halyna ; Remeš, Zdeněk ; Hruška, Karel ; Rezek, Bohuslav
A technological progress in the large area growth of diamond films and carbon nanotubes by the modified linear antenna MW system is presented. We show a correlation between process parameters and nano- or poly-crystalline film character. A challenging part, diamond coated mirrors or ATR prisms, are shown as multifunctional optical elements suitable for detection of absorbed molecules. Additional positive feature of the presented plasma system is low temperature hydrogen functionalization of diamond films. Finally, we present that combination of pulsed MW plasma with radiofrequency substrate biasing results in growth of oriented CNTs over large area.
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