Materials Literature
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Reversible ligand-centered one-electron oxidation of square-planar neutral complexes of palladium(II) and platinum(II) [M(bpy)(L)] (bpy=bipyridine, L: see picture) leads to the paramagnetic complexes [M(bpy)(L.)]+. Thus, the existence of S,S-coordinated o-dithiobenzosemiquinonate(1−) π radical ions has been proven une…
A reactive solid-phase epitaxy technique was applied to fabricate all-oxide transparent p-n heterojunctions composed of p-ZnRh2O4 and n-ZnO thin layers. Polycrystalline ZnRh2O4 was deposited on a ZnO epitaxial layer at room temperature. Thermal annealing of the bilayer sample at 950 °C in air converts the polycrystall…
We report a complete set of material properties of single-domain, relaxor-based 0.67Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 [PMN–33%PT] single crystals. Because the single-domain state is unstable in natural conditions, a bias electric field of 0.2 MV/m was applied along the dipole direction of the rhombohedral phase during the m…
Physical constraint and capillary force have been combined to provide a generic approach to assemble achiral building blocks such as monodisperse spherical colloids into helical mesostructures. The key component of this process is an array of V-shaped grooves anisotropically etched in the surface of a Si(100) wafer. T…
The deposition, characterization, and electrochemical responsiveness of boron-doped nanocrystalline diamond thin-film electrodes is reported. The films consist of clusters of diamond grains, ∼50−100 nm in diameter, and possess an rms surface roughness of 34 nm over a 5 × 5 μm 2 area. The individual and randomly ordere…
Monte Carlo simulations, supplemented by ab initio calculations, shed light onto the energetics and thermodynamic stability of nanostructured amorphous carbon. The interaction of the embedded nanocrystals with the host amorphous matrix is shown to determine in a large degree the stability and the relative energy diffe…
A simple one step hydrothermal reaction among ${\mathrm{TiO}}_{2}$ nanoparticles and KOH solution was found to result in potassium titanate nanowires. The diameters of these nanowires are about 10 nm and the lengths range from 500 nm to $2\ensuremath{\mu}\mathrm{m}.$ The nanowires were analyzed by a range of methods i…
We present a simple and versatile method for the synthesis of high-quality size-controlled metal sulfide nanoparticles. A single compound (metal xanthate) is the precursor. A Lewis-base solvent is used to achieve a low reaction temperature of 50-150 degrees C, usually in air. Demonstrated with CdS, the precise control…
Dangling bond wires on Si(001) are prototypical one dimensional wires, which are expected to show polaronic and solitonic effects. We present electronic structure calculations, using the tight binding model, of solitons in dangling-bond wires, and demonstrate that these defects are stable in even-length wires, althoug…
We have investigated the step stiffness on Cu(001) surfaces as a function of step orientation by two independent methods at several temperatures near 300 K. Both sets of data agree well and show a substantial dependence of the stiffness on the angle of orientation. With the exception of steps oriented along $<110>$, t…
We present the first low-temperature thermodynamic investigation of the controlled physisorption of He$^{4}$ gas in carbon single-wall nanotube (SWNT) samples. The vibrational specific heat measured between 100 mK and 6 K demonstrates an extreme sensitivity to outgassing conditions. For bundles with a few number of NT…
We analyze the transmission and reflection of the electromagnetic wave calculated from transfer matrix simulations of periodic arrangements of thin metallic wires. The effective permittivity and the absorption is determined. Their dependence on the wire thickness and the conductance of the metallic wires is studied. T…
A series of six new free base porphyrins were synthesized for use as photosensitizers in TiO2 dye-sensitized photo-electrochemical cells. The porphyrin sensitizers are attached to the TiO2 photoelectrode by phosphonic or carboxylic acid anchoring groups. These anchoring groups were placed on different substitution pos…
A new perspective of electron transfer chemistry is described for fine control of electron transfer reactions including back electron transfer in the charge separated state of artificial photosynthetic compounds and its synthetic application. Fundamental electron transfer properties of suitable components of efficient…
We have designed and manufactured a flanged coaxial line as a sample holder for measuring the electromagnetic interference (EMI) shielding efficiency (SE) of planar materials in broadband frequency ranges up to 18 GHz. Connecting the samples holder to a vector network analyzer (50 MHz⩽M⩽13.5 GHz), we measured the S (s…
This paper presents a hypothesis relating the exclusion of a molecule (solute) from the surface of a protein in aqueous solution with the ability of that molecule to render surfaces “protein-resistant”, that is, resistant to the adsorption of proteins from aqueous buffer. While few current data test this hypothesis, i…
We have synthesized a Eu2+-activated Sr2SiO4 yellow phosphor and investigated an attempt to develop white light-emitting diodes (LEDs) by combining it with a GaN blue LED chip. Two distinct emission bands from the GaN-based LED and the Sr2SiO4:Eu phosphor are clearly observed at 400 nm and at around 550 nm, respective…
Highly transparent ZnO-based thin-film transistors (TFTs) are fabricated with optical transmission (including substrate) of ∼75% in the visible portion of the electromagnetic spectrum. Current–voltage measurements indicate n-channel, enhancement-mode TFT operation with excellent drain current saturation and a drain cu…
Abstract Completion technologies for horizontal and subsea deep-water wells have been developed to make feasible and increase oil production. Horizontal and subsea wells in Petrobras are usually located at long distances from production facilities and in deepwater. Scale control can be implemented on these wells via b…
From microwave cavity transmission measurements at 23--110 GHz on $\ensuremath{\lambda}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TSF}{)}_{2}{\mathrm{FeCl}}_{4},$ we have observed an antiferromagnetic resonance (AFMR) in the antiferromagnetic insulating state below the metal-to-insulator transition temperature…