Materials Literature
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We established the number of Si 2p photoelectrons emanating from a Si(100) substrate covered with a silicon–oxide film as a function of azimuthal and polar angles using the oxide film thickness as a parameter. The elastic and inelastic scattering cross sections of Si 2p photoelectrons in silicon oxide were deduced by…
A molecular‐scale interface , consisting of a “fused” heterojunction between a nanotube and a quantum dot, has been prepared. This work is significant for the construction of functional hierarchical assemblies with unique properties. The Figure shows a schematic representation of a CdTe quantum dot grown directly onto…
Open-tipped carbon nanotubes with a large amount of subnanopores and open ends on the tube wall were conveniently prepared by an improved anodized aluminum oxide template growth. The hydrogen storage was measured based on a volumetric method. Adsorptions of 6.46 and 1.12 wt % were achieved at 77 K and room temperature…
The Hamiltonian of wurtzite quantum rods with an ellipsoidal boundary under electric field is given after a coordinate transformation. The electronic structure and optical properties are studied in the framework of the effective-mass envelope-function theory. The quantum-confined Stark effect is illustrated by studyin…
We use theory and experiment to demonstrate that a composite material, consisting of a metallic planar fractal and a metal sheet separated by a thin dielectric layer, can reflect electromagnetic wave in-phase at a series of frequencies, with some of the corresponding wavelengths much longer than the reflector’s own si…
This study performs O K- and Ti L3,2-edge x-ray absorption near-edge structure (XANES) measurements and first-principles pseudopotential calculations for the electronic structures of ABO3-type Pb1−xCaxTiO3 (x=0–1) perovskites. The features in the O K-edge XANES spectra are found to be contributed primarily by hybridiz…
A new chelating radical ligand 4ImNNH (2-(4-imidazolyl)-4,4,5,5-tetramethylimidazolin-1-oxyl 3-oxide) was prepared, and complexation with divalent transition metal salts gave complexes, [M(4ImNNH)(2)X(2)], which showed intermolecular ferromagnetic interaction in high probability (7 out of 10 paramagnetic compounds inv…
Hydrogen adsorption measurements on two types of different carbon nanomaterials were carried out at 77 K up to hydrogen pressures of 2 MPa using the volumetric method modified for low-temperature experiments. The adsorption property was concluded as dense hydrogen physisorption in subnanometer-sized pores because of t…
Aligned and hollow BC x N nanotubes with uniformly distributed concentrations of B, C, and N are produced by reacting aligned CN x nanotubes with B 2 O 3 and CuO in a N 2 atmosphere at ∼ 1800 °C. It is found that the production of these homogeneous nanotubes is sensitive to the reaction temperature determining the gro…
We report on electrical resistance measurements of single multiwalled carbon nanotubes (MWNTs) in different environments (ambient air, H 2 , O 2 and the electrolytes LiClO 4 , KCl, KMnO 4 and H 3 PO 3 ). The gate dependence is studied using back-gating, electrochemical gating and gates evaporated directly onto the nan…
$\text{ }\text{ }^{47,49}\mathrm{T}\mathrm{i}$ NMR spectra of ${\mathrm{L}\mathrm{a}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$ are reexamined and the orbital state of this compound is discussed. The NMR spectra of ${\mathrm{L}\mathrm{a}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$ taken at 1.5 K under zero external field indicate a…
The Rashba spin-orbit splitting parameter has been calculated in wurtzite GaN/AlGaN heterostructures. Despite the fact that wide-bandgap semiconductors are expected to have a smaller spin-orbit coupling parameter than that in InGaAs-based III-V materials, the electron spin-split energy in GaN/AlGaN heterostructure is…
We have applied the FTIR-luminescence/FT-Raman technique to map the near-infrared photoluminescence?(PL) of water?surfactant dispersions of single-walled carbon nanotubes (SWNTs) in broad excitation (250?1500?nm) and emission (800?1700?nm) ranges. The excitation wavelength was scanned by using the monochromatized ligh…
Effects of disorder on the two competing phases, i.e., the ferromagnetic metal and the commensurate charge/lattice ordered insulator, are studied by Monte Carlo simulation. The disorder suppresses the charge/lattice ordering more strongly than the ferromagnetic order, driving the commensurate insulator to the ferromag…
Chemical characterization of cellulose derivatives is of high importance as it provides information about the often inhomogeneous substitution that may seriously affect the properties of these polymers in various applications. A detailed mapping of the chemical structure of these derivatives requires several advanced…
The equilibrium polymerization of sulfur is investigated by Monte Carlo simulations. The potential energy model is based on density functional results for the cohesive energy, structural, and vibrational properties as well as reactivity of sulfur rings and chains [Part I, J. Chem. Phys. 118, 9257 (2003)]. Liquid sampl…
The study of polarization reversal in (Pb,La)(Zr,Ti)O3 thin films reveals a drastic difference between the switching kinetics observed at RT and at low temperature of 40 K. In particular, at 40 K, the switching kinetics in studied films is similar to that observed in ferroelectric single crystals. Additionally, the fi…
Well‐aligned silica nanotubes with lengths up to 0.9–1.0 mm have been prepared via a vapor–liquid–solid process. The nanotubes are either partially filled with indium or hollow (see Figure). The thermal expansion behavior of a liquid indium column inside a silica nanotube, a prospective novel inorganic nanotube‐based…
We study the kinetics of the isotropic-smectic phase transition in a colloidal rod/polymer mixture by visualizing individual smectic layers. First, we show that the bulk isotropic-smectic phase transition is preceded by a surface freezing transition in which a quasi-two-dimensional smectic phase wets the isotropic-nem…
We have demonstrated narrow-band visible light emission from size selected silicon nanoparticles (np-Si), with a wavelength controlled by size tuning. The np-Si were synthesized by pulsed-laser ablation of a silicon single-crystal target in high-purity He background gas. A postannealing process improved morphology and…