Materials Literature
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By direct atomic nitrogen (N) doping, high concentration of N is incorporated into TiO2 and the doping effects are investigated. High resolution x-ray photoelectron spectroscopy core-level spectra indicate N substitution for O and formation of Ti–N bonds. Different Ti valent states are found at different N concentrati…
Monte Carlo simulations are carried out for Zn cluster supported on a suspended graphene to estimate the morphological evolution of the following growth of ZnO nanostructure. The metal–metal interactions are modeled with the tight-binding many-body potential and a Lennard-Jones potential is used to describe the metal-…
Analysis and modeling of impedance spectroscopy data of ferroelectric BaTi2O5 single crystal has been carried out at temperatures both below and above the ferroelectric Curie temperature, TC. The most appropriate equivalent circuit is found to consist of a parallel combination of a resistor (R), capacitor (C), and con…
We established a generalized tight-binding method (TBM) to study the coupling effects in metamaterials. All parameters involved in our theory can be calculated from first principles, and the theory is applicable to general photonic systems with both dielectric and magnetic materials. As an illustration, we applied the…
A novel approach has been developed for synthesizing nitrogen-doped carbon nanotubes (N-CNTs) from flames using liquid amines as fuels, such as isopropylamine, n-propylamine and n-butylamine, which not only created a high reaction temperature but also provided a source of C and N. The microstructure and morphologies o…
The combined use of two techniques namely electrospray and spinning is made use in a highly versatile technique called electrospinning, which produces the diameter of polymer fibers range from nanometer to sub-micron. In this work, we have studied effects of adding LiCl on the morphology and diameter of electrospun po…
Using the polymer blending method, conductive materials and waterborne polyurethane (WPU) were mixed to fabricate conductive composite films for application in electromagnetic shielding. First, nitric acid was used to purify the multi-walled carbon nanotubes (MWCNT). Second, sodium dodecyl sulfate (SDS) was utilized t…
We report an experimental and theoretical investigation of fluorescence decay and transmission coefficient at ∼1 μm pumping for a series of bismuth (Bi) doped alumino-silicate fibers with different concentrations of Bi centers. By modeling the experimental data, we show that the excited-state absorption (ESA) and up-c…
In this paper, we directly develop a facile method to decorate a modified porous anodic alumina membrane (PAA) with an ultrathin porous film of gold nanoparticles with sub-gaps less than 25 nm and particle size less than 40 nm on the top surface and Au nanoparticles uniformly attached to the pore walls as well as the…
Response surface methodology (RSM), a collection of statistical and mathematical techniques, has been widely used to optimize and design operating conditions. Although this method is suitable for optimizing experimental conditions, very few attempts have been made on the electrospinning process. In this work, RSM was…
Abstract Synthetic imogolite surface was modified with alkyl phosphate by covalent bonding from an aqueous solution, and the individual imogolite tubes with a hydrophobic external surface were directly observed with transmission electron microscopy.
For the first time, the TiO2 nanorod arrays have been prepared on ITO substrates at room temperature by dc reactive magnetron sputtering technique. These TiO2 nanorods have a preferred orientation along the (220) direction and are perpendicular to the ITO substrate. Both the X-ray diffraction and Raman scattering meas…
The metal-insulator transition (MIT) in vanadium dioxide in the vicinity of room temperature makes it one of the most interesting materials for novel switching device applications. It is therefore essential to have a fundamental understanding of the VO2 surface when it is incorporated into multilayer structures or nan…
Fibrous membrane with a fibre diameter of 229 +/- 35 nm was fabricated from polyimide solution by electrospinning. Nanofibrous membrane with a fibre diameter of 251 +/- 37 nm was fabricated by combined electrospinning and electrospraying for polyimide/TiO2. Among the different solvents studied, ethanol was the effecti…
Graphite is composed of a series of stacked parallel graphene layers bonded by weak van der Waals forces. Although the weak interactions that hold the graphene sheets together allow them to slide readily over each other, the numerous weak bonds make it difficult to separate the sheets. A graphene sheet is a two-dimens…
We designed and fabricated a dielectric metamaterial consisting of one set of high permittivity resonators. We experimentally showed that this metamaterial exhibits resonant effective permittivity, issued from the second mode of Mie resonances of these resonators. Therefore, metamaterials consisting of high permittivi…
We report the effect of impurity doping at the Mn-site on magnetization and magnetic entropy change (ΔSm) in Pr0.6Ca0.4Mn0.96B0.04O3 with B cations having different electronic and spin states [B=Al3+(d0), Cr3+(d3), Fe3+(d5), Co2+(d7), Ni2+(d8), and Ru4+/5+(d4/3)]. The charge ordered antiferromagnetic insulator Pr0.6Ca…
In studies of weak magnetism in diluted magnetic semiconductor thin films, there is often a significant difficulty in subtracting the background signal arising from the substrate. In the present work, an improved magnetic correction method is proposed. For Al doped ZnO and Fe doped TiO2 films, the magnetic moment and…
A thin dielectric resonator consisting of a dielectric substrate and the thin film deposited upon it is shown to suffice for microwave characterization and dielectric parameter measurement of high-permittivity thin films without electrodes. The TE01δ resonance mode was excited and measured in thin (down to 0.1 mm) rec…
We report our recent findings from the study of the field emission, electrical transport, and their correlation of individual single CuO nanowires grown by thermal oxidation. Typical Fowler–Nordheim (FN) plot of a single CuO nanowire exhibits an upward bending behavior with increasing applied electric field: a rare ph…