Materials Literature
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Abstract In recent years, considerable effort has been devoted to the development of transition metal complexes as novel luminescent materials that have potential application in the fluorescent labels for chemistry or biology. Among them, the nanostructured lanthanide complexes have been receiving much attention becau…
New GaN Schottky barrier diodes (SBDs) on Si substrates are proposed to achieve a high-breakdown voltage. We have fabricated GaN SBDs using doped GaN/unintentionally doped (UID) GaN because doped GaN with the thickness of 200 nm is suitable for high-current operation. The 1-µm-deep mesa and low-temperature annealing o…
This paper presents the X-band and C-band power performance of MOCVD grown N-polar AlGaN/GaN MIS-HEMTs grown on semi-insulating SiC substrates. Additionally, an AI2O3based etch stop technology was demonstrated for improving the manufacturability of N-polar GaN HEMTs with SixNypassivation. The reported output power den…
Shock waves are experimentally investigated in multi-component “liquid — gas bubbles — liquid drops” media. The data are obtained on the shock wave structure and properties in these multi-component media.
Abstract Summary: A novel coordination polymer[{Cu(en)2}(V10O28)]n · 2n[Cu(en)2(H2O)] · 2n(H3BO3) · 2n(H2O) was obtained by hydrothermal reaction. The compound crystallizes in the monoclinic crystal system, in the C2/c space group, with a = 26.490 (3) Å; b = 11.6558 (11) Å; c = 19.8426 (19) Å; β = 124.011 (1)°; V = 50…
An experimental study of the detonation parameters and structure of the reaction zone for liquid high explosives (HEs), such as bis(2-fluoro-2,2-dinitroethyl)formal (FEFO), tetranitromethane (TNM), and nitromethane (NM) is performed. For each of these HEs, the time corresponding to the position of the Chapman-Jouguet…
The authors report a feasible and simple microfluidic approach for synthesizing anisotropic gel particles based on template method. By filling arrays of microwells with alginate hydrogel and synthesizing gold nanoparticles (AuNPs) on the gel surface, anisotropic alginate gel particles with single side gold nanoparticl…
The influence of temperature on the growth of carbon nanotubes (CNTs) by chemical vapor deposition (CVD) using FeCl3 as a floating catalyst (FC) precursor and methane as a carbon source was studied. FeCl3 was found to be an efficient FC precursor for methane CVD into CNTs without the need of introducing hydrogen in fe…
Thinning the CdTe is advantageous, inter alia, to reduce the consumption of Te in solar modules; however the CdTe cell performance typically decreases with CdTe thickness. In comparison with other deposition techniques, sputtering appears to be well suited for ultra-thin device preparation partly due to control over t…
The process of low-carbon steel’s corrosion in water on the addition of a water extract of horse chestnut fruit by gravimetric, electrochemical, and physical-chemical methods, namely, UV and IR spectroscopy and X-ray analysis, was investigated. It was shown that the extraction time and the additives’ concentration app…
The state of tetra(3-nitro-5- tert -butyl)phthalocyanine in DMSO medium was studied. Sufficiently high stability of the obtained proton transfer complex is established, and its structure is suggested. It is shown that this complex is kinetically unstable in the highly basic media. Effect of the nature of cyclic and ac…
Melt conditioning by intensive shear was used prior to twin roll casting of an AZ91 magnesium alloy strip to promote heterogeneous nucleation and produce a refined and uniform microstructure without severe macro-segregation. The as-cast strip was then processed by homogenization, hot rolling and annealing and the micr…
Kinetics of changes in sizes of phase regions and volumes at the early stages of the phase separation of glasses in the PbO-B 2 O 3 system has been studied using small-angle X-ray scattering (SAXS). The existence of the interval of heating durations in which the changes in the sizes of the phase regions and volumes ar…
Synthetic methodology and physicochemical characterization of multi-wall carbon nanotubes (MWCNTs) functionalized with a crown ether molecule is reported. The MWCNTs were synthesized by spray pyrolysis technique using toluene as carbon source and ferrocene as catalyst. The nanotubes were characterized by scanning elec…
We introduce a new coupled neutronics/thermal-hydraulics code system for analyzing transients of high-temperature gas-cooled reactors (HTGRs), based on a neutron transport theory approach. At the heart of the coupled code system resides the DORT-TD code, a time-dependent extension of the well-known DORT discrete ordin…
Abstract We have investigated the transparent electrodes using indium tin oxide (ITO) for UV light‐emitting diodes (LEDs). The carrier concentration of ITO was increased from 1.1×1018 to 1.5×1021cm‐3 after annealing under N2 ambient at 600 °C. The fundamental absorption edge was also shifted to a shorter wavelength ow…
ZnO and Eu-doped ZnO thin films were deposited on quartz substrates by reactive radio-frequency magnetron sputtering from a ZnO and Eu-doped ZnO ceramic target respectively. The properties of thin films were characterized by atom force microscope (AFM), X-ray diffraction (XRD), and photoluminescence spectra (PL). XRD…
Abstract The reactions of enaminones with dimethyl diazomalonate were investigated in the presence of copper(II) acetylacetonate. From the reaction of (E)‐3‐[methyl(phenyl)amino]‐1‐phenylprop‐2‐en‐1‐one (6c), dimethyl 2‐[methyl(phenyl)amino]‐4‐oxonaphthalene‐1,1‐(4H)‐dicarboxylate, was unexpectedly obtained as the maj…
Admittance spectroscopy of Indium Tin Oxide (ITO)–poly(3,4-ethylenedioxythiophene) (PEDOT)–polyfluorene–Al organic light emitting diodes is analyzed by varying PEDOT dispersion. Loss–frequency diagrams show one or two peaks. The results have been interpreted by using the Nicollian and Brews admittance model. Single le…
In this study, we investigate the transformation mechanism from a phase mixture of magnetite (Fe3O4) and hematite (α-Fe2O3) to a single-phase magnetite through the addition of a specific metal element. The thin films were prepared by rf sputtering with a composite target of metal chips set on a ceramic magnetite (or h…