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Tin oxide (SnO 2 ) films have been grown on r-cut sapphire substrates by metalorganic chemical vapor deposition (MOCVD). The substrate temperature dependent structural and electrical properties of SnO 2 films were investigated. It was found that the films deposited at lower temperatures were polycrystalline while the highly oriented growth occurred above 600 °C. Especially, high-quality...
TiN coating was deposited on cemented carbide (WC–TiC–Co) substrates by Magnetic Filter Arc Ion Plating (MFAIP). Si ions were implanted into samples with the doses of 5 × 10 16 ions/cm 2 and 1 × 10 17 ions/cm 2 at 40 kV by using Metal Vacuum Vapor Arc (MEVVA) ion source. After oxidation at different temperatures ranging from 550 to 700 °C, changes in the microstructure,...
Al–Al 2 O 3 –Al nanocapacitors are fabricated using hard and mild anodization methods which is simple and inexpensive. Samples are prepared with various effective areas and dielectric thicknesses below 10 nm. The experiments are carried out for glass slides and porous anodic alumina as substrates. The capacitance characteristics of the fabricated capacitors were measured and studied...
In coloration of fabric, pigment shows more environmental advantages than dye, however, the product has poorer colour fastness to crocking. Previous investigations have revealed that after non-polymerizing oxygen plasma treatment, hydrophilicity of cotton increases because of modification of the fibre surface. Therefore, oxygen plasma treatment was carried out on cotton fabric before red pigment coloration,...
The electronic structure and bonding of acrolein (propenal) adsorption on Pt (111) were studied by density functional calculations (DFT). We optimized different adsorption configurations on the surface using the VASP code. The energetic study indicates that acrolein trans isomers are less stable on the Pt surface than cis configurations, which have a similar stability in all cases. We found that the...
CuInS 2 thin films of chalcopyrite structure were fabricated on indium tin oxide substrates by electrochemical co-deposition of copper–indium alloy layers at 1 atm, followed by sulphurization. Co-deposition potential was determined according to voltammetric study. The effect of deposition potential, concentration of complexing agent, and heat treatment temperature on the morphology and crystal...
In vacuum systems gas flows not only through slot channels with constant cross section but also through slot channels with variable cross-section. The relationship obtained analytically for the conductance calculation of three types of slot channels in viscous flow regime at small pressure difference at the ends of the channel is presented in this paper. This relationship is recommended for the calculation...
The paper reports the possibilities to utilize the full solar spectrum (UV–NIR) by combining two different materials which have wide transparency over visible and NIR region. Simple vacuum deposition was preferred to produce ZnSe thin films with multiple 2D PbSe submonolayers (ML). Cross sectional TEM image proves the PbSe ML are well in order and has good periodicity at the interfaces of ZnSe layers...
A multicrystalline silicon ingot was obtained from metallurgical-grade silicon by vacuum induction melting and directional solidification. Based on the concentration distributions of aluminum and calcium along the growth direction, the removal mechanism of such impurities with both high saturated vapor pressures and low segregation coefficients is investigated. The results show that the removal of...
Nano-graphite was mixed in Nano-diamond powder and cellulose or other organic vehicles to fabricate paste for screen-printed film. Through special thermal-sintering technique and post-treatment process, Nano-diamond emission tip was sharp and distributed uniformly over the surface. A pressure sensor based on Nano-diamond film was designed and simulated. According to Fowelr Nordheim equation, the physics...
Niobium carbide thin films have been deposited on Si(100) substrates by direct current reactive magnetron sputtering using CH 4 as a carbon source. With increasing FCH4 from 4 to 22 sccm, the carbon content for the film increases from 32.7 to 68.7 at.% gradually, accompanying with a phase transition from hexagonal-Nb 2 C to cubic-NbC, and at the highest carbon content, the film exhibits...
Polycrystalline bulk samples of PrFe 1−x Mn x O 3 (x = 0.0, 0.1, 0.3, 0.5) were synthesized by solid state reaction method to understand their structural, optical and dielectric properties. X-ray diffraction (XRD) and Raman spectroscopy were investigated to confirm chemical phase and the orthorhombic pbnm structure. As the concentration of Mn increases, the lattice parameter...
Non-uniform microstructure and low growth rate of ceramic coatings in the mid-to late period of micro-arc oxidation (MAO) are the problems that limit the development of micro-arc oxidation technology. In this paper, the MAO process on 6061 aluminum alloy was carried out under ultrasonic condition, and the effects of ultrasonic vibration on microstructure and growth characteristics of MAO coatings...
Ni films with a thickness of 45–240 nm were sputter-deposited on HCl-doped polyaniline (HCl-PANI) substrates at 300 K, forming the Ni/HCl-PANI composites. All the Ni films grow with columnar grains. The grain size increases with increasing film thickness. A temperature dependence of the resistance within 5–300 K reveals that all the Ni/HCl-PANI composites exhibit a metal–semiconductor transition....
Composites with embedded metal nanoparticles attract much interest due to their unique physical properties, which considerably depend on size and shape of the nanoparticles, and on interparticle distance and dispersity of these parameters. Crystal defects can have an effect on the nucleation of nanoparticles. In this paper, the effect of defects on the nucleation and growth of silver nanoparticles...
In 2 Se 3 is one of the most significant n-type layered semiconductor belonging to III–VI binary compound materials. In this paper, polycrystalline In 2 Se 3 films were obtained by magnetron radio-frequency (RF) sputtering. The as-deposited films were analyzed by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and optical measurements...
The aim of the present study was to develop the hybrid method which allows producing highly corrosion-resistant composite titanium nitride layers on the AZ91D magnesium alloy. The hybrid method combines the deposition of composite titanium nitride layers using the PVD methods with the final tightening of the layers by a simple chemical-type treatment. The tightened multilayer obtained by the hybrid...
Two terminations of the tetragonal SrHfO 3 (001) surfaces have been investigated using the first-principles density-functional theory within the localized density approximation. The interplanar distances, rumpling parameters, surface band structures, density of states, charge densities, surface energies and stability of the SrO-termination and HfO 2 -termination have been calculated...
Aluminum hydride (AlH 3 ) is one of the most promising hydrogen and energy storage materials, and it has a high gravimetric and volumetric density of hydrogen. In this work, three aluminum hydride polymorphs (α-AlH 3 , β-AlH 3 , and γ-AlH 3 ) were prepared through the desolvation of AlH 3 -etherate using the organometallic synthesis method, and AlH 3 ...
We have studied the effect of the film thickness on the electronic structure of pure nickel and iron thin films. Series of the thin films were evaporated by e-beam evaporation on SiN substrates. The electronic structure of the thin films was investigated using X-ray absorption near edge structure (XANES) spectroscopy. We have showed the thickness dependent variation of the experimental branching ratio...
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