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.
Boron coatings doped with Cr, Ti or Mo were deposited on plane substrates of vitreous carbon (“Sigradur G”) by magnetron sputtering from a composite target. The amount of included metal was determined by Auger electron spectroscopy and found to be in the range of 1–4at%. The metal content relative to boron was chosen to be in the range of 3at% for all interlayers. Onto these interlayers a Cu film...
The morphology of buried interfaces plays a key role in high performing Mo/Si soft X-ray mirrors. We show that grazing-incidence small-angle X-ray scattering is a highly effective and non-destructive diagnostic technique for analysis of buried interfaces. The parameters of average interface autocorrelation function can be determined unambiguously. Additionally period thickness, roughness of interfaces...
Surface morphology of AlN films, synthesized on Si substrates by pulsed laser deposition, has been examined by recording atomic-force-microscopy (AFM) images. The influence of N 2 ambient pressure, ranging from 5×10 −4 Pa to 10Pa, is reflected well in the alteration of the surface roughness and size of crystallites of the AlN films. A tendency of a decrease in the surface roughness...
Thermal stability of hydrogenated amorphous Si/Ge multilayers has been investigated by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Small-Angle X-Ray Diffraction (SAXRD) techniques. Amorphous H–Si/Ge multilayers were prepared by RF sputtering with 1.5 and 6ml/min H 2 flow-rate. It is shown by Elastic Recoil Detection Analysis (ERDA) that the hydrogen concentration...
Thermal interaction of indium phosphide (InP) bulk compound semiconductor with thin gold metal films was investigated in the course of the present work. The interaction of the InP/Au system resulted in a pattern showing fractal dimensions. The temperature dependence of the fractal parameters was investigated in a broad temperature range from 200 to 600°C. No significant temperature dependence of the...
A study is presented on the structural changes occurring in thin amorphous silicon (a-Si) during thermal treatments. The a-Si films were deposited on single-crystalline Si substrates held at room temperature by magnetron sputtering of a Si target in pure Ar atmosphere, and therefore the films were hydrogen-free. All samples were annealed in vacuum and subsequently studied by electron paramagnetic...
The CO oxidation behaviour of planar Au/TiO 2 model catalysts was studied by a combination of kinetic measurements and in-situ IR measurements under realistic pressure and temperature conditions (p=20mbar, T=80°C). During reaction in a CO/O 2 mixture, the model catalysts deactivated significantly. Adding small amounts of H 2 O (1000ppm) to the reactive CO/O 2 gas mixture,...
The conductance of an NPL orifice in the molecular regime is constant and can be exactly calculated from the geometric dimensions. For smaller Knudsen numbers the conductance increases and correction functions are employed to reduce the uncertainty in this range of pressures. The conductance is also constant in the viscous regime during flow into a vacuum and can also be calculated. A suitable function...
Nanocrystalline diamond (NCD) films were prepared by microwave plasma-enhanced chemical vapour deposition (CVD) on Si substrates of different roughness (1 and 500nm). Diamond nano-crystals are up to 50nm in size and RMS surface roughness is less than 20nm. The NCD films were cleaned chemically and terminated by hydrogen using plasma treatment (800°C, 10min) to generate a hydrophobic surface. Photolithography...
The continuous expansion system can be considered the state of the art for pressure measurement in the ultra high vacuum range. In the last years, at INRIM, a new continuous expansion system was designed, assembled and characterized. The system is the high vacuum primary standard in the pressure range from 1×10 −6 Pa to 9×10 −2 Pa with relative standard uncertainty ranging from 2.1%...
The contribution presents results of computer simulations describing the interaction between a low-temperature multicomponent plasma and an immersed metal substrate. For this purpose two models were prepared. The first model is designed to follow the volume processes in oxygen-containing electronegative plasma. The technique used was the macroscopic kinetic approach with a kinetic scheme consisting...
In this work, we introduce a new modified approach to the formation of interdigital transducer (IDT) structures on an AlGaN/GaN heterostructure. The approach is based on a shallow recess-gate plasma etching of the AlGaN barrier layer in combination with “in-situ” SF 6 surface plasma treatment applied selectively under the Schottky gate fingers of IDTs. It enables one to modify the two-dimensional...
The inelastic mean free path (IMFP) is a fundamental material parameter. Presently the IMFPs calculated by the TPP-2M predictive formula (NIST SRD 71) are generally used. Elastic peak electron spectroscopy (EPES) is proved to be adequate for experimental determination of the IMFP denoted by λ e . λ e is smaller then λ i (TPP-2M) values, due to surface losses, characterized...
Active DC glow discharges in oxygen have been studied in Silica and Pyrex discharge tubes for medium pressures up to 550Pa and for discharge currents up to 40mA. Electric field strength measured by a double-probe technique was found to increase with the pressure and to decrease with the discharge current, which is typical for DC glow discharges. We have focused on the emitted radiation. The rotational...
Interaction of low-energy nitrogen ions (0.3–2keV N 2+ ) with GaAs (100) surfaces has been studied by X-ray photoemission spectroscopy (XPS) around N 1s and Ga 3d core-levels and near-edge X-ray absorption fine structure (NEXAFS) around the N K-edge, using synchrotron radiation. At the lowest bombardment energy, nitrogen forms bonds with both Ga and As, while Ga-N bonds form preferentially...
Morphological properties of metal/dielectric composite films consisting of individual metal particles in a dielectric matrix were studied by methods of computational physics. The simulated composite structures were prepared by hard-sphere and soft-sphere models with given spatial distribution of objects ranging from totally random, through various degrees of order up to anisotropic in certain directions...
Reactive deposition epitaxy was used to prepare β-FeSi 2 nanodots on a Si(001) surface. The influence of annealing on optical properties has been studied. Annealing increases the particle size and decreases absorption. The indirect optical transition at 0.84–0.89eV dominates the absorption spectra below 1.3–1.5eV. The film with smaller nanoparticles exhibits higher absorption with direct optical...
Very thin metal films deposited on dielectrics consist of small three-dimensional islands (objects) distributed on the substrate. The quantitative characterisation of the object arrangement can bring information about internal processes in the studied system. For the analysis of systems consisting of small, regular objects, the methods of mathematical morphology applied to images of these systems...
GaN-core/Au-shell nanowires were fabricated and the effects of thermal annealing on the structural and photoluminescence (PL) properties were investigated. The surfaces of hetero-nanowires became rough due to the thermal annealing which could be attributed to the agglomeration of Au-shell layers into the cluster-like structures. X-ray diffraction indicated that the thermal annealing enhanced the crystallinity...
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.