Materials Literature
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A series of zinc(II) porphyrin-imide dyads (ZP-Im), in which an electron donating ZP moiety is directly connected to an electron accepting imide moiety in the meso position, have been prepared for the examination of energy gap dependence of intramolecular electron transfer reactions with large electronic coupling. The…
Defect formations located in the bulk of ${\mathrm{KH}}_{2}{\mathrm{PO}}_{4}$ crystals are studied using a specially designed microscopic fluorescence imaging system. The concentration of the observed defect clusters varies depending on the crystal-growth method, the growth sector of the crystal, and the speed of grow…
Oxygen transport: Here, the authors present the elucidation of the NO decomposition activity of Cu-ZSM-5 (see picture) by identifying the bis(μ-oxo)dicopper species as the key intermediate that allows the smooth formation and desorption of O2. Its isomerized (μ-η2:η2-peroxo)dicopper core is present in natural enzymes,…
Electromigration lifetime was measured as a function of liner thickness for Cu/SiO2 interconnect structures. A significant increase in mean lifetime was observed for structures in which the liner thickness at the base of the test via was less than approximately 6 nm, with a current density <5 mA/μm2 in the powe…
Adding specific foreign elements into the eutectic Sb70Te30 fast-growth material is expected to be an effective way to increase its thermal stability for blue laser recording. We have studied the effects of Ag and In addition on the optical properties and crystallization kinetics of the eutectic Sb70Te30 recording fil…
The fluorine-containing metal naphthalocyanines [F16NcGaCl] (7) and [(F16NcGa)2O] (8), which represent the first examples of peripherally fluorine substituted naphthalocyanines, were synthesized, and the nonlinear optical transmission was studied. Peripheral substitution by fluorine atoms enhances the solubility and p…
Electronic excitation energy migration in a photonic antenna host-guest material has been investigated by time-resolved fluorescence experiments and by Monte Carlo calculations. The host consists of a linear channel system (zeolite L). The channels are filled with energy transporting dyes (donors) in their middle sect…
We demonstrate an enhancement of the spontaneous emission from colloidal CdSe quantum dots embedded in a half-wavelength one-dimensional cavity. When embedded in the cavity, the emission of the quantum dots is enhanced by a factor of 2.7. We also show a strong amplification by one order of magnitude in the absorption…
We develop physical models for magnetic semiconductor devices, where a part of the device structure consists of a ferromagnetic semiconductor layer. First we calculate the effect of the exchange interaction between the charge carrier spins and the spins of the localized magnetic electrons on the electronic states, rec…
Optically transparent, mesostructured titanium dioxide thin films were fabricated using an amphiphilic poly(alkylene oxide) block copolymer template in combination with retarded hydrolysis of a titanium isopropoxide precursor. Prior to calcination, the films displayed a stable hexagonal mesophase and high refractive i…
Electronic structure calculations of Sr2Be2B2O7 (SBBO) family crystals including Sr2Be2B2O7, BaAl2B2O7, and K2Al2B2O7 have been performed based on a plane-wave pseudopotential method. Moreover, the linear optical coefficients and the static second-harmonic generation (SHG) coefficients of BaAl2B2O7 and K2Al2B2O7 are c…
Monodisperse polystyrene (PS) films with various thicknesses were spun-coated on silicon wafers with native oxide layer. Surface relaxation behavior in the PS films was studied as a function of thickness by lateral force microscopy (LFM). In the case of a thick PS film, a clear lateral force peak corresponding to surf…
Pulsed laser deposition was used to grow thin films of several compositions from the Pb(Mg1/3,Nb2/3)O3–PbTiO3 (PMN–PT) solid solution as dielectric layers in thin film capacitor structures. They were found to display functional behavior characteristic of relaxors, with the only significant difference between thin film…
The composition and magnetic properties of two types of ultrathin ${\mathrm{Fe}}_{3\ensuremath{-}\ensuremath{\delta}}{\mathrm{O}}_{4}(111)$ films grown epitaxially on Pt(111) have been characterized using conversion electron M\"ossbauer spectroscopy (CEMS) and x-ray magnetic circular dichroism (XMCD). CEMS data from b…
The vacuum ultraviolet (VUV) spectra of the nanosized YBO3:Eu crystals, which have already been prepared by a more facile sol–gel pyrolysis process at a relatively low annealing temperature in our previous work, were investigated and compared to the bulk synthesized by conventional solid-state reactions. In the emissi…
Optical absorption, luminescence spectra and upconversion of both red to green and infrared to green luminescence have been studied for a Ho3+ doped zinc tellurite glass of composition 19ZnO−80TeO2−1Ho2O3. From the absorption data, Judd–Ofelt parameters for the Ho3+ ion are calculated along with the radiative transiti…
We consider the dynamics of Vicsek fractals of arbitrary connectivity, models for hyperbranched polymers. Their basic dynamical properties depend on their eigenvalue spectra, which can be determined iteratively. This paves the way for theoretical studies to very high precision for regular, finite, arbitrarily large hy…
With increasing the Li doping level in La0.7Ca0.3−yLiyMnO3 (0⩽y⩽0.3), the system is driven from a higher-conductivity regime to a lower-conductivity regime, which is in sharp contrast with the behavior of Na or K doping. Compared to those of K or Na, the ionic radius of Li is much smaller than that of Ca. Therefore, s…
When an industrial process is developed using the microbial transformation of a precursor into a desired chemical compound, high concentrations of substrate and product will be involved. These compounds may become toxic to the cells. In situ product removal (ISPR) may be carried out, using auxiliary phases such as ext…
Structural information on osteocalcin or other noncollagenous bone proteins is very limited. We have solved the three-dimensional structure of calcium bound osteocalcin using (1)H 2D NMR techniques and proposed a mechanism for mineral binding. The protons in the 49 amino acid sequence were assigned using standard two-…