Materials Literature
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Abstract Multiblock poly(ether‐ester) thermoplastic elastomers (PBT/PTMO) are based on semicrystalline poly(butylene terephthalate) (PBT) and amorphous oxytetramethylene (PTMO) blocks. The copolymer was compounded with a filler content up to 10 wt% multi wall carbon nanotubes (MWCNTs) via a masterbatch process, which…
Abstract In this article, preparation and characterization of nanocomposites consisting of polyaniline (PANI) doped with dodecyl benzene sulfonic acid (DBSA) as a matrix with multiwalled carbon nanotubes (MWCNT) are described. Dispersion of MWCNT was conducted by ultrasonication in water/DBSA solution (1%) by ultrason…
We present results of electronic structure and magnetization measurements of Co:ZnO and Co:ZnO codoped with Al thin-film samples fabricated by solution-based methods together with ab initio electronic structure calculations. Electronic structure measurements indicate that the Co states lie close to the valence-band ed…
The electronic properties, finite-temperature magnetism, and transport properties of semi-Heusler quaternary alloys (Cu,Ni)MnSb are studied theoretically by means of ab initio calculations as a function of the alloy composition. As documented by experiment, the transition from the ferromagnetic state (NiMnSb) to the a…
Abstract In this communication, the synthesis, characterization, and properties of highly conductive core–shell nanocomposites of poly( N ‐vinylcarbazole) (PNVC)–polypyrrole (PPY) copolymers with multi‐walled carbon nanotubes (MWCNTs) are described. A unique free‐radical coupling reaction between PNVC and PPY cation r…
We have studied Raman scattering in Co-doped ZnO nanorods prepared by thermal diffusion. Experimental results show that the features of their non-resonant spectra are similar to Raman spectra from Co-doped ZnO materials investigated previously. Under resonant conditions, however, there is a strong enhancement of multi…
Cu 2 O and CuO have been grown with an aim to reduce junction electrical resistance when interfaced with N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′ biphenyl 4,4′-diamine (NPB). Organic light-emitting diodes employing Cu/CuO anodes have equivalent driving voltages as devices made with indium tin oxide. Hole-injection barr…
We calculate the expected finite frequency neutron-scattering intensity based on the two-sublattice collinear antiferromagnet found by recent neutron-scattering experiments as well as by theoretical analysis on the iron oxypnictide LaOFeAs. We consider two types of superexchange couplings between Fe atoms: nearest-nei…
A high performance liquid crystal display using combined fringe and in-plane horizontal electric fields is proposed. The strong electric fields cause more liquid crystals to reorient almost in plane above and between the pixel electrodes. As a result, the operation voltage is lower and transmittance is higher than tho…
X-ray photoelectron spectroscopy was used to measure the valence band offset at the ZnO/Zn0.85Mg0.15O heterojunction grown by plasma-assisted molecular beam epitaxy. The valence band offset (ΔEV) is determined to be 0.13 eV. According to the experimental band gap of 3.68 eV for the Zn0.85Mg0.15O, the conduction band o…
Thickness dependence of structural and electrical properties of multiferroic Mn-doped BiFeO3 (BFMO) thin films, grown on SrTiO3 (001) substrates with a bottom electrode of SrRuO3, was investigated. Very good ferroelectric properties were obtained in the thicker BFMO films with a typical remanent polarization of ∼65 μC…
We present a novel optical technique that produces nanometer dimensional measurement sensitivity using a conventional bright-field optical microscope, by analyzing through-focus scanning-optical-microscope images obtained at different focus positions. In principle, this technique can be used to identify which dimensio…
Plasma-assisted molecular beam epitaxy has been shown to be a viable and practical method for producing high quality tin oxide, SnO2. Phase-pure epitaxial single crystalline SnO2 (101) thin films of 1μm in thickness were reproducibly grown on r-plane sapphire Al2O3 (101¯2) substrates. The SnO2 epitaxy progressed in th…
Nanoparticulate zinc oxide is regarded as one of the most promising inorganic materials for printable field-effect transistors (FETs), which work in the n-channel enhancement mode, due to the compatibility with solution, low-temperature, and high throughput processes. Since nanoparticulate films are composed of the na…
Abstract Born's long wave method is used to study the elastic properties of graphite and graphene. Starting from an empirical force constant model derived from full inplane phonon dispersions of graphite [Mohr et al., Phys. Rev. B 76 , 035439 (2007)] we calculate the tension coefficients of graphene. Extending the mod…
Abstract Well‐faceted hexagonal ZnO nanorods have been synthesized by a simple hydrothermal method at relative low temperature (90°C) without any catalysts or templates. Zinc oxide (ZnO) nanorods were grown in an aqueous solution that contained Zinc chloride (ZnCl 2 , Aldrich, purity 98%) and ammonia (25%). Most of th…
Classical and ab initio molecular dynamics (MD) simulations have been carried out to investigate the effect of a different treatment of interatomic forces in modeling the structural properties of multicomponent glasses and melts. The simulated system is a soda-lime phosphosilicate composition with bioactive properties…
We propose a device for studying the Fermi-Hubbard model with long-range Coulomb interactions using an array of coupled quantum dots defined in a semiconductor two-dimensional electron-gas system. Bands above the lowest energy band are used to form the Hubbard model, so that a high average electron density may be used…
We report 75As-NQR/NMR studies on the oxygen-deficient iron(Fe)-based oxypnictide superconductors LaFeAsO_{0.6} (T_c=28 K) along with the results on LaFeAsO, LaFeAsO_{0.75}(T_c=20 K) and NdFeAsO_{0.6}(T_c=53 K). Nuclear spin-lattice relaxation rate 1/T_1 of 75As NQR at zero field on LaFeAsO_{0.6} has revealed a T^3 de…
Stable configurations, electronic structures, and magnetic behaviors for N, O, and F absorptions on graphene have been investigated by first-principles calculations. It is found that F atom is located just above the C atom, while both O and N atoms are located above the carbon-carbon bond. Strong interactions between…