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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 23
Kumar, Nirmal , Haviar, Stanislav , Rezek, Jiří , Baroch, Pavel , Zeman, Petr
Tuning Stoichiometry and Structure of Pd-WO3−x Thin Films for Hydrogen Gas Sensing by High-Power Impulse Magnetron Sputtering

By tuning the deposition parameters of reactive high-power impulse magnetron sputtering, specifically the pulse length, we were able to prepare WO3−x films with various stoichiometry and structure. Subsequently, the films were annealed in air at moderate temperature (350 °C). We demonstrate ...

Kumar, Nirmal , Čapek, Jiří , Haviar, Stanislav
Nanostructured CuWO4/WO3-x films prepared by reactive magnetron sputtering for hydrogen sensing

High-purity films consisting of copper tungstate (CuWO4) and sub-stoichiometric tungsten oxide (WO3-x) were prepared by reactive sputter deposition. An original two-step deposition process was applied for their synthesis. First, a tungsten oxide thin film was deposited by dc magnetron sputtering ...

Kolenatý, David , Vlček, Jaroslav , Bárta, Tomáš , Rezek, Jiří , Houška, Jiří , Haviar, Stanislav
High‑performance thermochromic VO2‑based coatings with a low transition temperature deposited on glass by a scalable technique

We report on high-performance thermochromic ZrO2/V0.982W0.018O2/ZrO2 coatings with a low transition temperature prepared on glass by a low-temperature scalable deposition technique. The V0.982W0.018O2 layers were deposited by a controlled high-power impulse magnetron sputtering of V target, combined w...

Zeman, Petr , Zuzjaková, Šárka , Čerstvý, Radomír , Houška, Jiří , Shen, Yi , Todt, Juraj , Jiang, Jiechao , Daniel, Rostislav , Keckes, Jozef , Meletis, Efstathios I. , Vlček, Jaroslav
Extraordinary high-temperature behavior of electrically conductive Hf7B23Si22C6N40 ceramic film

The high-temperature behavior of an electrically conductive, opaque and hard Hf7B23Si22C6N40 ceramic film with an amorphous structure was systematically investigated in air up to 1700 °C and inert gases up to 1600 °C. The film was prepared by reactive pulsed dc magnetron sputter de...

Choukourov, Andrei , Melnichuk, Iurii , Gordeev, Ivan , Nikitin, Daniil , Tafiichuk, Renata , Pleskunov, Pavel , Hanuš, Jan , Houška, Jiří , Kretková, Tereza , Dopita, Milan
Self-organization of vapor-deposited polyolefins at the solid/vacuum interface

Interactions between polyolefins and silicon substrates are investigated upon their physical vapor deposition under vacuum. Molecular dynamics simulations show that polyolefins unfold upon adsorption and that two macromolecules suffice to produce a stable nucleus. Supersharp probe AFM measurements reveal&#...

Batková, Šárka , Čapek, Jiří , Rezek, Jiří , Čerstvý, Radomír , Zeman, Petr
Effect of positive pulse voltage in bipolar reactive HiPIMS on crystal structure, microstructure and mechanical properties of CrN films

CrN films were prepared using three different configurations of the HiPIMS discharge mode and the substrate holder potential. We investigate the effect of a positive pulse voltage (30–400 V) in bipolar HiPIMS on the crystal structure, microstructure and resulting mechanical properties of...

Belosludtsev, Alexander , Vlček, Jaroslav , Houška, Jiří , Haviar, Stanislav , Čerstvý, Radomír
Tunable composition and properties of Al–O–N films prepared by reactive deep oscillation magnetron sputtering

Houška, Jiří , Kozák, Tomáš
Distribution of O atoms on partially oxidized metal targets, and the consequences for reactive sputtering of individual metal oxides

Čapek, Jiří , Batková, Šárka , Matas, Martin , Kos, Šimon , Kozák, Tomáš , Haviar, Stanislav , Houška, Jiří , Schusser, Jakub , Minár, Jan , Dvořák, Filip , Zeman, Petr
Bixbyite-Ta2N2O film prepared by HiPIMS and postdeposition annealing: Structure and properties

Shen, Yi , Jiang, Jiechao , Zeman, Petr , Šímová, Veronika , Vlček, Jaroslav , Meletis, Efstathios I.
Microstructure evolution in amorphous Hf–B–Si–C–N high temperature resistant coatings after annealing to 1500 °C in air

Recently, amorphous Hf–B–Si–C–N coatings found to demonstrate superior high-temperature oxidation resistance. The microstructure evolution of two coatings, Hf7B23Si22C6N40 and Hf6B21Si19C4N47, annealed to 1500 °C in air is investigated to understand their high oxidation resistance. The annealed coatings develop...

Mareš, Pavel , Vlček, Jaroslav , Houška, Jiří , Kohout, Jiří , Čapek, Jiří
Effect of energetic particles on pulsed magnetron sputtering of hard nanocrystalline MBCN (M = Ti, Zr, Hf) films with high electrical conductivity

Nanocrystalline MBCN (M = Ti, Zr, Hf) films were deposited onto Si substrates using pulsed magnetron co-sputtering of a single B4C-M target. The substrate temperature was adjusted to 450 °C during the depositions on the substrates at a floating potential. The total pressure of ...

Musil, Jindřich , Čiperová, Zuzana , Čerstvý, Radomír , Haviar, Stanislav
Flexible hard (Zr, Si) alloy films prepared by magnetron sputtering

The article reports on the investigation of mechanical properties of Si-rich (Zr, Si) alloy films deposited by magnetron sputtering. The main aim of this investigation is to develop flexible hard (Zr, Si) alloy films with enhanced resistance to cracking. The (Zr, Si) films were...

Houška, Jiří
Maximum N content in a-CNx by ab-initio simulations

Structures of amorphous CNx materials are predicted by extensive ab-initio molecular-dynamics simulations (more than 800 trajectories) in a wide range of compositions and densities. The main attention is paid to the formation of N2 molecules, with the aim to predict and explain the ...

Musil, Jindřich , Jaroš, Martin , Kos, Šimon
Superhard metallic coatings

The letter reports on the surface hardening of bulk soft metal materials by protective coatings made of the same metal as bulk but with up to 6 times higher hardness than that of the bulk material. This surface hardening is demonstrated by covering of the Ti substrat...

Rezek, Jiří , Novák, Petr , Houška, Jiří , Pajdarová, Andrea Dagmar , Kozák, Tomáš
High-rate reactive high-power impulse magnetron sputtering of transparent conductive Al-doped ZnO thin films prepared at ambient temperature

Reactive high-power impulse magnetron sputtering was used for high-rate (deposition rate of 60 nm/min) deposition of conductive (resistivity of 0.003 Ω·cm) and optically transparent (extinction coefficient at the wavelength of 550 nm of 0.01) ZnO:Al thin films at ambient temperature (<&#x...

Musil, Jindřich , Kos, Šimon , Jaroš, Martin , Čerstvý, Radomír , Haviar, Stanislav , Zenkin, Sergei , Čiperová, Zuzana
Coating of overstoichiometric transition metal nitrides (TMNx (x > 1)) by magnetron sputtering

This article reports on the formation of strongly overstoichiometric ZrNx>1 and Ti(Al, V)Nx>1 coatings by reactive magnetron sputtering. Problems in the formation of overstoichiometric coatings and possible ways to form strongly overstoichiometric TMNx>1 nitride coatings up to TMNx=2 dinitride...

Javdošňák, Daniel , Musil, Jindřich , Soukup, Zbyněk , Haviar, Stanislav , Čerstvý, Radomír , Houška, Jiří
Tribological properties and oxidation resistance of tungsten and tungsten nitride films at temperatures up to 500 °C

The paper reports on the structure, microstructure, mechanical and tribological properties and oxidation resistance of WNx films with a stoichiometry x = [N]/[W] ranging from 0 to 1.5 prepared by magnetron sputtering. It was found that (i) films with x ≤ 0.20 exhibit α-W ...

Houška, Jiří , Kolenatý, David , Vlček, Jaroslav , Bárta, Tomáš , Rezek, Jiří , Čerstvý, Radomír
Significant improvement of the performance of ZrO2/V1–xWxO2/ZrO2 thermochromic coatings by utilizing a second-order interference

The paper deals with VO2-based thermochromic coatings prepared by reactive magnetron sputtering. We combine four ways how to improve the coating performance and to increase its application potential. First, reactive high-power impulse magnetron sputtering with a pulsed O2 flow control allowed...

Vejchodský, Tomáš , Jaroš, Filip , Kučera, Milan , Rybář, Vojtěch
Unilateral regulation breaks regularity of Turing patterns

We consider a reaction-diffusion system undergoing Turing instability and augment it by an additional unilateral nonsmooth unilateral source term. We investigate its influence on the Turing instability and on the character of resulting patterns. We illustrate the importance of the nonsmoothness&#...

Loewenhoff, Thorsten , Linke, Jochen Max , Matějíček, Jiří , Rasiński, Marcin , Vostřák, Marek , Wirtz, Marius
Laser re-melting of tungsten damaged by transient heat loads

In the current study, a solid state disc laser with a wavelength of 1030 nm and maximum power of 5.3 kW was used to melt the surface of pure tungsten samples (manufactured according to ITER specifications by Plansee SE). Several combinations of laser power and traverse&#x...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 23