Materials Literature
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We report results for the photoluminescence emission intensity from ZnSe quantum-dot dispersions in liquids as a function of particle concentration. The observed emission intensity initially increases with dilution, exhibits a maximum, and then decreases. The optimal particle concentration yielding the maximum emissio…
Abstract Polymer concrete (PC) was developed by using different concentrations of silica sand as aggregate and a commercial unsaturated preaccelerated (orthophtalic) polyester resin. The PC specimens were submitted to gamma radiation at several dosages: 5, 10, 50, 100, and 150 kGy. Mechanical performance was evaluated…
Abstract Die Koordinationschemie der Porphyrine dreht sich vornehmlich um den Einbau von Metallionen unterschiedlicher Ladung und Größe in den Tetrapyrrolkern, um Metalloporphyrine mit neuen Eigenschaften zu erhalten. Eine Organometallchemie der Porphyrine muss sich aber nicht zwangsläufig auf das im Porphyrinkern geb…
Abstract Here we discussed electromagnetic response of onion‐like carbon (OLC) powders with variable ratio of decreasing in size diamond core and defective curved graphitic shells (sp 2 /sp 3 nanocomposites) in Ka‐band (26‐37 GHz) band. sp 2 /sp 3 ratio in OLC was regulated by increasing of annealing temperature of ex…
Abstract 3‐D rose‐like microstructures of polyaniline (PANI), which are self‐assembled from 2‐D nanosheets consisted of 1‐D nanofibers, were synthesized by a template‐free method in the presence of ammonium peroxydisulfate (APS) as both oxidant and dopant under a high relative humidity of 80% for the first time. When…
Abstract Single walled carbon nanotube field‐effect transistors (SWCNT FETs) are attributed as possible building blocks for future molecular electronics. But often these transistors seem to randomly display hysteresis in their transfer characteristics. One reason for this is suggested to be water molecules adsorbed to…
A new family of double salts has been developed that can display infinite one-dimensional chains of metallophilic interactions in the solid state. These salts are composed of cationic and anionic components that are designed to participate in metallophilic interactions with one another. These building blocks incorpora…
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…