Materials Literature
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The effect of monazite on the oxidation of SiC was studied in laboratory and dry air. Monazite inhibited the oxidation of Tyranno‐SA™, Tyranno‐ZX™, Sylramic, and Hi‐Nicalon SiC fibers. Oxidation of pure chemical vapor deposition SiC and undoped SiC single crystals was not inhibited by monazite. Dry oxidation of both u…
Forward bias electron injection into the p side of a p-n homojunction was shown to result in an improved response of the ZnO photodiodes. Injection of about 25C of charge yielded a nearly 2.5-fold increase of photocurrent at 350nm. This improvement was correlated with the increase of the diffusion length of minority e…
The authors report on the fabrication of room-temperature ferrimagnetic semiconductor thin films composed of 0.6FeTiO3∙0.4Fe2O3 solid solution on α-Al2O3 (0001) substrates using a pulsed laser deposition method. A single ordered phase (R3¯ symmetry) is obtained under very limited deposition conditions including oxygen…
Commercially available SiC fibers were coated with monazite (LaPO 4 ) using a continuous vertical coater at 1100°C. Coated fibers were heat treated in dry air, argon, and laboratory air at 1200°C for 1–20 h. The tensile strengths of uncoated and coated fibers were measured and evaluated before and after heat treatment…
The potential applications of polarization graded ferroelectrics as high performance sensors and actuators are theoretically investigated. A static bending can be expected in polarization graded ferroelectric plates, forming a vertical displacement. This is due to the built-in strain gradient that arises from the grad…
A numerical technique that relies on modifying the organic semiconducting host with metallic carbon nanotubes (CNTs) to increase the transconductance or, equivalently, reduce effective channel length (Leff) has recently been proposed. The authors use an extensive set of experimental data to analyze the performance of…
Polymer‐derived ceramics (PDCs) are a new class of ceramics that are obtained from direct pyrolysis of densely crosslinked polymers. In this article, we report the mechanical and tribological properties of silicon‐based PDCs. The density, the elastic modulus, the hardness, and the fracture toughness of silicon oxycarb…
A layer of polyethylene dioxythiophene:polystyrene sulfonic acid (PEDT:PSS) spun onto the surface of an inorganic semiconductor forms a highly asymmetric rectifying junction when a small current is applied and can be permanently open circuited with application of a high current density. This allows the polymer/semicon…
Multilayer thin films were prepared by the layer-by-layer (LBL) deposition method using a rhenium-containing hyperbranched polymer and poly[2-(3-thienyl)ethoxy-4-butylsulfonate] (PTEBS). The radii of gyration of the hyperbranched polymer in solutions with different salt concentrations were measured by laser light scat…
The dislocation density tensor has been an important variable in the theoretical characterization of dislocations in deformed crystals since its introduction over 5 decades ago. However, the non-destructive, three-dimensional (3D) measurements of lattice rotations and elastic strain needed to determine dislocation den…
Single-walled carbon nanotubes (SWNTs) and lysophospholipids readily assemble into supramolecular complexes in aqueous solutions. Upon light excitation the fluorescence of rhodamine-labeled lysophospholipids was redshifted and quenched due to the optical absorption of the SWNTs. Utilizing fluorescence energy transfer,…
The authors report on the photoluminescence properties of polycrystalline ZnO thin films grown on compliant silicon-on-insulator (SOI) substrates by radio frequency magnetron sputtering. The ZnO thin films on SOI were characterized by micro-Raman and photoluminescence (PL) spectroscopy. The observation of E2high optic…
Based on the density of states obtained by theoretical calculation, electron transport mechanism of carbon nanotube is studied for field emission applications. This letter focuses on how Stone-Wales defect and vacancy-related defect affect carbon nanotube’s emission property. The influence is presented in the form of…
Doping of carbon nanotubes with nitrogen during growth strongly modifies their electronic structure through n-type doping. This provides the possibility of producing nanotubes with high conductances, independent of tube chirality. To date, electrical measurements on individual nitrogen-doped multiwalled nanotubes (CNx…
The authors report on a high-performance large-aperture switchable diffractive lens using nematic liquid crystal that can be used as an adaptive eyewear. The odd- and even-numbered ring electrodes are separated in two layers, avoiding the gaps between the neighboring electrodes and allowing high diffraction efficiency…
The authors report on hybrid electro-optic (EO) polymer–sol-gel modulators with low half-wave voltage (Vπ) and low insertion loss. Larger EO coefficient r33 results from the high poling field achieved when EO polymer is sandwiched between sol-gel cladding layers. The reduced interelectrode distance (d) resulting from…
Abstract Chemical polypyrroles (PPys) of low (σ < 75 S/cm), medium (75 < σ < 200 S/cm) and high electrical conductivity (σ > 200 S/cm) having chloride dopants have been investigated by XPS, chloride ion‐selective electrode (ISE) measurements and high‐resolution termogravimetric analysis (TGA). The average…
Nonlinear magnetoelectric (ME) effects have been investigated in a multilayer of nickel zinc ferrite and lead zirconate titanate. The ME voltage has been measured under ac magnetic field amplitudes H of up to 1kOe over the frequency range f=1mHz–1Hz. Frequency doubling is observed for the ME voltage V generated across…
We present high-resolution bulk-sensitive photoemission spectra of ${({\mathrm{V}}_{1\ensuremath{-}x}{M}_{x})}_{2}{\mathrm{O}}_{3}$ $(M=\mathrm{Cr},\mathrm{Ti})$. The measurements were made for the paramagnetic metal (PM), paramagnetic insulator (PI), and antiferromagnetic insulator (AFI) phases of ${({\mathrm{V}}_{1\…
Binary ferromagnetic ${\mathrm{Mn}}_{3\ensuremath{-}\ensuremath{\delta}}\mathrm{Ga}$ ($1.2<3\ensuremath{-}\ensuremath{\delta}\ensuremath{\le}1.5$) crystalline thin films have been epitaxially grown on wurtzite GaN(0001) surfaces using rf $N$-plasma molecular beam epitaxy. The film structure is face-centered tetrago…