Materials Literature
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We report oxygen reduction in bulk strontium titanate substrates when a thin film was deposited in an oxygen-deficient environment. The oxygen diffusion occurred at moderate temperatures and oxygen pressures, which were not enough to produce detectable oxygen vacancies without the film deposition. In order to identify…
To understand the behaviour of irradiated defects and kinetic pathways of micro-structural evolution in Fe–Cr alloys, we use a combination of density functional theory with statistical approaches involving cluster expansions and Monte Carlo simulations. A lowest negative mixing enthalpy is found at 6.25% Cr that is co…
The effects of the molar mass of polymethylmethacrylate (PMMA) on electrical, structural and morphological properties of conductive polyaniline–polymethylmethacrylate blends have been studied. We have plasticized the PMMA matrix by using dioctyl phthalate (DioPh). Three different molar masses of PMMA, 15 000, 120 000…
Soft x-ray reflectivity (SXR) of Cr∕Sc multilayer with bilayer thickness of Λ=1.56nm was increased by 100% by an intentional introduction of nitrogen during magnetron sputtering. Multilayers deposited at background pressures of ⩽2×10−6Torr exhibited amorphous layers with flat interfaces. At 2×10−5Torr, understoichiome…
We propose a light emitting transistor based on silicon nanocrystals provided with 200Mbits∕s built-in modulation. Suppression of electroluminescence from silicon nanocrystals embedded into the gate oxide of a field effect transistor is achieved by fast Auger quenching. In this process, a modulating drain signal cause…
We present a study of tip-enhanced Raman scattering on Au aerosol nanoparticles deposited on gold films. Under the tunneling current state, the Au tip and the Au aerosol nanoparticle form a narrow cavity, where large electromagnetic field enhancements are created to enhance Raman scattering enormously. Colorless p-thi…
We propose and demonstrate semiconductor nanocrystal based photovoltaic scintillators integrated on solar cells to enhance photovoltaic device parameters including spectral responsivity, open circuit voltage, short circuit current, fill factor, and solar conversion efficiency in the ultraviolet. Hybridizing (CdSe)ZnS…
We describe the design, fabrication, and characterization of a narrow band tunable guided mode resonance (GMR) reflectance filter that is actuated by optically induced trans-cis isomerization of an azobenzene liquid crystal. Constructing a plastic replica-molded containment cell with a rubbed polyimide film to initial…
Abstract In this report we demonstrate the suitability of hyperbranched polyglycerol as high‐loading support for asymmetric catalysis. A polyglycerol‐supported unsymmetrical salen ligand was prepared and purified by means of ultrafiltration. The polymeric ligand was metalated with cobalt acetate to afford the correspo…
We report the improved surface enhanced Raman scattering (SERS) of mechanically ruptured nanoporous gold. The SERS intensities of rhodamine 6G and crystal violet 10B molecules from the fracture surfaces of nanoporous gold are about one order of magnitude higher than those from the as-prepared samples. Microstructural…
) films were synthesized by a reactive RFmagnetron sputtering system with a DC bias under various deposition conditions, and theirphysical and electrical properties were investigated with a view to using them for microhumidity sensors. The FTIR spectra of the deposited films showed a C=N stretching bandin the range of…
Doping a minute amount of photocurable monomers in a liquid crystal (LC) cell, we can stabilize the LC alignment after UV exposure by forming a LC pretilt layer on the substrate surface. By varying the UV exposure time, we can control the pretilt angle of the LCs continuously. A single-cell-gap transflective LC cell w…
We have studied the crystal structure of fully deuterated BH3NH3 using powder neutron diffraction at different temperatures. It is evident that an order-disorder phase transition occurs around 225K. At low temperature, the compound crystallizes in the orthorhombic structure with space group Pnm21 and gradually transfo…
Nb and La codoped BiFeO3 thin films were fabricated on oxide bottom electrodes, LaNiO3∕Si and IrO2∕Si, by pulsed laser deposition method. The doped BiFeO3 thin film capacitor on LaNiO3 showed a remnant polarization of more than 75μC∕cm2 in a saturated hysteresis loop. The same La and Nb codoped BiFeO3 thin film capaci…
We investigate multi-color spontaneous emission from quantum-dot- quantum-well heteronanocrystals made of onion-like (CdSe)ZnS/CdSe/ZnS (core)shell/shell/shell structures, with our theoretical results explaining experimental measurements for the first time. In such multi-layered heteronanocrystals, we discover that th…
Dipolar colloidal particles self-assemble into a rich variety of microstructures ranging from co-crystals of unusual symmetry, to open networks (gels) of cross-linked chains of particles. We use molecular dynamics computer simulation to explore the self-assembly, structure, crystallization and/or gelation of systems o…
Refractory diboride with silicon carbide additive has a unique oxide scale microstructure with two condensed oxide phases (solid+liquid), and demonstrates oxidation resistance superior to either monolithic diboride or silicon carbide. We rationalize that this is because the silica‐rich liquid phase can retreat outward…
Thin films of In2O3 have been grown on Y-stabilized ZrO2(100) by oxygen plasma assisted molecular beam epitaxy with a substrate temperature of 650°C. Ordered epitaxial growth was confirmed by high resolution transmission electron microscopy. The position of the valence band onset in the x-ray photoemission spectra of…
Disordered packings of equal sized spheres cannot be generated above the limiting density (fraction of volume occupied by the spheres) of rho approximately 0.64 without introducing some partial crystallization. The nature of this "random-close-packing" limit (RCP) is investigated by using both geometrical and statisti…
A luminescence database for minerals and materials has been complied from the literature, the aim being to create a resource that will aid in the analysis of luminescence spectral of ionic species in minerals and materials. The database is based on a range of excitation techniques and records both major and minor line…