The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Transition metal dichalcogenides (TMD) are well known for their self lubricant properties, due to unique crystal structure, with low hardness which makes them inappropriate in applications requiring high load bearing capacity. Nevertheless, there is still a considerable potential for further improvements since other TMDs such as diselenides remain almost unknown. The WSeC coatings were deposited by...
Ti–Si–Al–N films were prepared by rf reactive magnetron sputtering, in static and rotation modes, using a wide range of different deposition conditions, which created conditions to obtain Ti–Al–Si–N coatings with different structural arrangements.Films prepared below a critical nitrogen flow, under conditions out of thermodynamic equilibrium, revealed a preferential growth of an fcc (Ti,Al,Si)N ...
The very low pressure obtained thanks to adsorption phenomenon at low temperature can be used to build cryogenic heat switches, which offer the possibility to make or break thermal contact between two parts of a cryogenic system. The ON (conducting) and OFF (insulating) states of the switch are obtained by varying the gas pressure between two copper blocks separated by a gap of 100μm. This pressure...
The structural thermal behaviour of three W–O–N sputtered coatings with similar metalloid to metal ratio (∼2.1) was investigated up to 900°C after annealing in a vacuum tube furnace as well as in-situ HT-XRD under a controlled atmosphere of Ar–5%H 2 . The as-deposited microstructure of the coatings consisting in a nanocomposite of low-order W–O and W–N phases evaluated differently as a function...
We present a discussion of some of the physical properties of graphene and its bilayer. In particular, we focus our attention on the calculation of the transparency of graphene and on the dependence of the energy gap of the biased graphene bilayer on the electronic density. We show that the transparency of graphene is controlled by the value of the fine structure constant over a frequency range from...
We have deposited Ti x Si y N nanocomposites by means of a custom-made cathodic arc evaporation system, using a TiSi 80/20at% compound target in a reactive Ar–N 2 atmosphere. We have studied the influence of different process parameters, like the amount of nitrogen in the gas, the total pressure, the arc current or the deposition temperature, on the properties of the material...
Protective Zr(Y)O 2−δ -based films sputter-deposited onto apatite-type lanthanum silicate ceramics were appraised for potential applications in solid oxide fuel cells with silicate-based solid electrolytes, where the performance may suffer from surface decomposition processes in reducing atmospheres. Dense and crystalline coatings were deposited using radio-frequency magnetron sputtering from...
Cathodic cage plasma nitriding is a new growth technique based on multiple hollow cathode effects. The samples are kept at a floating potential inside a cage that acts as a cathode and shields the samples from the cathodic potential. The aim of this work is to perform a systematic study of the properties of nitrided layers as a function of the distance from the nitriding sample surface to the cage...
Hydrogenated amorphous carbon nitride (a-CN x :H) films were deposited by plasma enhanced chemical vapor deposition (PECVD) in CH 4 –NH 3 system. The chemical composition and bonding configuration were investigated by XPS and FTIR. The results indicated that both sp 2 CN and sp 3 CN bonds generally increased with the increase of the nitrogen concentration, and...
Aligned tin dioxide (SnO 2 ) nanorods have been synthesized by high-frequency inductive heating. Nanorods were grown on silicon substrates vertically in less than 3min, using SnO 2 and graphite as the source powder. Scanning electron microscopy and transmission electron microscopy showed nanorod with diameters from 25 to 50nm. The turn-on field needed to produce a current density of...
Tellurium nanorods were grown on silicon (111) substrates by thermal evaporation. The synthesized Te nanorods were characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM), prior to the field emission investigations. The TEM image revealed that the nanorods are needle-like having diameter less than 20nm and length in the range of 200–400nm. The selected area electron...
Very lightweight, thin liquid hydrogen/deuterium heat pipe-target systems are used in the Time Of Flight (TOF) spectrometer at the COSY accelerator facility. The proton beam impinges upon LH 2 /LD 2 targets thereby heating the target. The stability of the liquid targets depends on the thermal capacity of the whole system, the energy losses from the proton beam and heat losses from...
With three additional magnetic rings being assembled outside the discharge room and connected with the magnetic field of the conventional unbalanced magnetron sputtering, a closed magnetic field configuration distribution had been formed in the whole discharge room and which can confine discharge plasma more effectively. The spatial distribution of the newly designed magnetic field configuration was...
Zirconium thin films have been applied as protective coating films on ceramics by dual frequency oxygen plasma sputtering [Y. Ohtsu et al., Surf Coat Technol, 196 (2005) 81], where they were certified to be effective in modifying the surface state of china and porcelain with the water-repellency and the stoichiometric value of atomic ratio O/Zr in films. However, the deposition rate with the former...
The electrodeposited two-phase γ-Ni+γ′-Ni 3 Al and single-phase γ′-Ni 3 Al coatings with and without CeO 2 particles were developed by the conversion of electrodeposited Ni–Al or Ni–Al–CeO 2 films with dispersed Al microparticles in Ni matrix into γ′-Ni 3 Al by vacuum annealing at 800°C for 3h. SEM/EDAX and TEM characterizations showed that the CeO 2 ...
Sulfurization of copper indium gallium diselenide (CIGS) thin films solar cell absorber has been attempted to enhance the open circuit voltage of the device by increasing the band gap of the absorber near the interface. The homogeneous co-evaporated Cu(InGa)Se 2 thin film was used for sulfurization. The sulfurization was studied in hydrogen sulfide and mixture of hydrogen sulfide and hydrogen...
The effect of surface structures of annealed (1¯012) and (0001) α-Al 2 O 3 substrates on epitaxial growth and electrical properties of electron beam deposited WO 3 thin films has been investigated. (0001) and (1¯012) α-Al 2 O 3 surfaces were used in (1×1) stoichiometric and reconstructed forms. The structure and the morphology of WO 3 films were determined...
The optical properties of vapour chopped and nonchopped undoped tin oxide thin films (1000Å) have been studied. The films were prepared by thermal oxidation (in air) of vacuum evaporated vapour chopped and nonchopped tin thin films. Effect of varied oxidation temperature and duration was also studied. As revealed by X ray diffraction studies, polycrystalline (both tetragonal and orthorhombic) films...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.