Materials Literature
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Abstract CuPc thin films were grown on the hydrogenated vicinal Si(111) surfaces by organic molecular beam deposition (OMBD). Spectroscopic ellipsometry was employed to determine the refractive index ( n ) and extinction coefficient ( k ). Furthermore, the ratio of the out‐of‐plane to the in‐plane absorption intensity…
We have determined quantitatively third-order anharmonic phonon coupling matrix elements in vapor-liquid-solid (VLS) grown ZnO nanowires, via an analysis of the Raman line shape of the E2high phonon mode. The results suggest that the decay of the E2high phonon into the sum of two acoustic phonons is suppressed in VLS-…
A multichannel carbon nanotube field-effect transistor (MC-CNTFET) with compound channel layer has been built. In this MC-CNTFET, a dispersedly directed array of long single-walled carbon nanotubes (SWCNTs) is used as primary channel layer and a randomly aligned monolayer network of short SWCNTs acts as secondary set…
The paper presents the anticorrosion characteristics of a novel Ni/Ti 2 N composite coating applied through electrodeposition and cathodic arc physical vapour deposition for protection of sintered NdFeB permanent magnets that are susceptible to corrosion in active environments. The composite coating was evaluated in s…
The time, yield and related genes expression of PHB accumulation of Acidiphilium cryptum DX1-1 were investigated under four different initial C/N ratios 1.2, 2.4, 7.5, and 24. The results of time and yield of PHB accumulation show that the initial C/N ratio 2.4 was optimum for strain DX1-1 to accumulate PHB, both high…
Light emitting field effect transistors based on narrow layers of silicon nanocrystals (NCs) in the gate oxide were fabricated. Direct quantum mechanical electron and hole tunneling into NCs was achieved by self-alignment of NCs-interface-distances to ∼2 nm. The direct tunneling reduces oxide degradation, prolongs dev…
Abstract Top gated graphene field effect transistors with AlN and Si 3 N 4 gate insulator materials were fabricated by plasma assisted deposition. Transistors with an AlN top gate insulator showed a reduced mobility and channel carrier density, whereas for the transistors with Si 3 N 4 dielectric an increase of the mo…
Current-voltage (I-V) characteristics of different ZnO nanostructures were studied using a combined nonequilibrium Green’s function and density functional theory techniques with the two-probe model. It was found that I-V characteristics of ZnO nanostructures depend strongly on their geometry. For wurtzite ZnO nanowire…
A p-MgZnO/i-ZnO/n-MgZnO light-emitting diode was fabricated on a GaAs substrate by metal–organic chemical vapour deposition. The I – V curve of the device exhibited typical rectifying behaviour of the p–i–n diode and the forward turn-on voltage was about 7 V. An obvious ultraviolet peak can be observed in the electrol…
The structure and the stability of the transferred monolayers of gold-thiol nanoparticles, formed at air-water interface at different surface pressure, on to silicon surface have been studied using two complementary techniques, x-ray reflectivity and atomic force microscopy (AFM). Networklike nanopatterns, observed th…
We report the observation of strain-induced antiferromagnetic domain structure on cleaved surface of NiO single crystal. This nonequilibrium domain structure undergoes various spin reorientations (from in plane to different in plane, out of plane to in plane) after mild annealing, indicating a direct correlation betwe…
Layered silicate composites having phenolic matrix were prepared by melt intercalation. The resole resin was synthesized and was characterized by FTIR spectroscopy. Method for making composites consisted of mechanically mixing the modified montmorillonite clay with phenol formaldehyde resin and curing the polymer to f…
We develop a generally applicable method for the accurate measurement of intrinsic switching field distributions and the determination of exchange and dipolar interactions in granular magnetic materials. The method is based on the simultaneous analysis of hysteresis loop and recoil curve data. Its validity and practic…
Metamaterials made of asymmetric cut wire pairs have experimentally demonstrated a negative refractive index at microwave frequencies. In this letter, we begin by presenting the analogy between asymmetric cut wire pairs and S-shaped metamaterials by a simple unifying approach. Then, using simulations and experiments i…
Atomic resolution high-angle annular dark-field imaging of La-doped bismuth titanate (BLT), Bi3.25La0.75Ti3O12, has been carried out with an aberration-corrected transmission electron microscope. The HAADF image revealed the presence of defects in the [Bi2O2]2+ layers and extra atomic rows between the [Bi2O2]2+ layers…
A comprehensive study on a series of highly stable calcium containing mesoporous aluminosilicate molecular sieves (CaAlMMSH) having different acidic properties has been made by varying the Si/Ca ratio in synthesis gels. The structural, physical, and porous properties of these microporous/mesoporous composite materials…
Selective chemical modification of a gold nano-cavity array is achieved via nanoscale templating to create fibrinogen patterned cavities with a polyethylene glycol modified top surface. Application of a reducing potential to the array readily releases the protein from the cavities.
A liquid crystal device is demonstrated using a short-pitch (260 nm) chiral nematic with negative dielectric anisotropy. Due to dielectric coupling, an in-plane electric field switches the liquid crystal between the standing-helix (field-off, “dark” state) and lying-helix (field-on, transmissive state) configurations.…
Oxygen dissolved in water is a cause of corrosion in heating installations. On the other hand, in the production of beverages such as beer, it leads to the oxidation of organic matter, decreasing the quality of the product. Therefore, its content must be substantially reduced. In this work, the catalytic deoxygenation…
We report direct observation of fluorine ion dopants in the recently discovered LaFeAsO1−xFx superconductor, where the doping is critical for the superconductivity. Employing spectroscopic imaging based on scanning transmission electron microscopy, the spatial distribution of the doped fluorine ions, which are invisib…