Národní úložiště šedé literatury Nalezeno 35 záznamů.  1 - 10dalšíkonec  přejít na záznam: Hledání trvalo 0.01 vteřin. 
Pulsed Laser Deposition under Low Background Gas Pressure.
Koštejn, Martin ; Fajgar, Radek ; Dřínek, Vladislav ; Jandová, Věra ; Klementová, Mariana ; Bakardjieva, Snejana
The nucleation of nanoparticles was applied during gold deposition onto TiO2 layers. For nucleation, up to 10 Pa of inert gas (argon) was used. Argon molecules efficiently helped to cool temperature of evolving plume and initiated the nucleation which resulted in deposition of gold nanoislands. Gold nanoparticles incorporated in TiO2 layers provided plasmonic properties. Au/TiO2 layers were used for water splitting as proved by photoelectrochemical measurements.
Plný tet: SKMBT_C22019092314120 - Stáhnout plný textPDF
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Nanoparticle Formation by Thermal Decomposition and Oxidation of Manganese(II) Acetylacetonate
Moravec, Pavel ; Smolík, Jiří ; Bakardjieva, Snejana ; Levdansky, V.V.
Over the last decade, Mn and MnOx nanoparticles has been extensively investigated due to their great importance in catalysis, electrochemistry, ion exchange materials, batteries and other areas (Si et al., 2005; Han et al., 2006). This work describes preliminary experiments producing manganese nanoparticles by metal organic chemical vapor deposition (MOCVD) using manganese(II) acetylacetonate (MnAA) as a precursor.
Plný tet: SKMBT_C22012102615333 - Stáhnout plný textPDF
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Generation of Binary COOx/SiO2 Nanoparticles from Organocompound Precursors
Moravec, Pavel ; Smolík, Jiří ; Bakardjieva, Snejana ; Levdansky, V.V.
In recent years cobalt and cobalt oxide nanoparticles have attracted substantial research effort because of their potential applications such as protective materials, catalysts, magnetic data recorders, batteries and gas sensors (Jang et al., 2004). To improve their functionality and biocompatibility nanoparticles are frequently coated with SiO2 (Teleki et al., 2008). In this work, we studied CoOx-SiO2 binary nanoparticles synthesis by metal organics chemical vapor deposition (MOCVD) using organo-compound precursors cobalt acetylacetonate (CoAA) and tetraethyl orthosilicate (TEOS).
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Preparation of Nanoparticles by Pyrolysis and Oxidation of Cobalt Acetylacetonate
Moravec, Pavel ; Smolík, Jiří ; Levdansky, V.V. ; Bakardjieva, Snejana
The aim of this work was to study cobalt and cobalt oxide nanoparticle synthesis by metal organic chemical vapor deposition (MOCVD) using cobalt acetylacetatone (CoAA) as a precursor.
Photocatalytic niobium and tantallum doped monodispersed nanoparticles of titania for visible-ligt applications
Štengl, Václav ; Houšková, Vendula ; Bakardjieva, Snejana ; Murafa, Nataliya
Niobium or tantalum doped anatase were prepared by thermal hydrolysis of peroxotitanium complex aqueous solutions dissolving niobium or tantalum peroxo-comples at 100 degrees C for 3 days The synthesized samples were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), High Resolution Transmission Electron Microscopy (HRTEM), surface area (BET) and porosity determination (BJH) The photocatalytic activity of doped titania samples was determined by decomposition of salicylic acid during irradiation at 365 nm and 400 nm Niobium-doping caused the increase of unit cell constants of anatase and the shape change of anatase crystallites from spindle-like to cubic-like structure. The niobium and tantalum doping increases the stability of anatase to above 1000 degrees C by inhibiting the growth of Mania crystallites.
Synthesis of Ru-doped titania and its photocatalytic properties
Houšková, Vendula ; Štengl, Václav ; Murafa, Nataliya ; Bakardjieva, Snejana
rystalline Mania particles doped with ruthenium oxide have been prepared by homogenous hydrolysis of TiOSO4 in aqueous solutions in the presence of thioacetamide and RuCl3 at 80 degrees C After annealing at 600 degrees C in oxygen atmosphere for 2 hours the synthesis of the Ru-doped Mania powders was complete The effects of the Ru doping on the morphology and microstructure of TiO2 nanoparticles and their impacts on the photocatalytic activity were studied The synthesized particles were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Nitrogen adsorption-desorption was used for surface area (BET) and porosity determination (BM) The photocatalytic activity of Ru-doped mania samples was determined by photocatalytic decomposition of Orange II dye in an aqueous slurry during irradiation at 365 nm and 400 nm wavelength The Ru-doped Mania samples demonstrated enhanced photocatalytic activity under UV and visible light.
Příprava Ni/NiOx nanočástic z acetylacetonátu niklu
Moravec, Pavel ; Smolík, Jiří ; Keskinen, H. ; Mäkelä, J.M. ; Bakardjieva, Snejana ; Levdansky, V.V.
Příprava Ni/NiOx nanočástic z acetylacetonátu niklu je předmětem vystoupení.

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