Materials Literature
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We report ultraviolet electroluminescence from ZnO nanoparticle-based devices prepared by the dry-coating technique. With dry-coating process, the structure of the ZnO nanoparticle monolayer (90nm) in the device can be easily achieved. The method reduces the density of pinhole defects in the ZnO nanoparticles. The con…
Cerium dioxide (CeO2) is one of the most widely used materials for oxygen gas sensors. The surface roughness of CeO2 thin films must be improved because the electrical and sensing properties of CeO2 thin films are determined by these characteristics. The authors selected chemical mechanical polishing (CMP) processing…
In this work, deposition, patterning, and metallization of vapor-deposited polycrystalline thermoelectric (TE) thin films of Bi2Te3, PbTe, and PbSnSeTe on silicon (Si) substrates are investigated. These fundamental microfabrication methods are intended for use in integrating TE films into thermally powered micro-elect…
A simple, long magnetoelectric (ME) composite rod with a long Pb(Zr,Ti)O 3 (PZT) rod embedded in Terfenol-D/epoxy medium is reported. Our results indicate that there is a critical aspect ratio around 10 for the PZT rod, above which a larger aspect ratio plays a limited role in enhancing the ME effect. Obvious anisotro…
Lead-free piezoelectric ceramics (Na 0.475 K 0.475 Li 0.05 )(Nb 0.92 Ta 0.05 Sb 0.03 )O 3 containing different amounts of CeO 2 have been prepared by a conventional mixed-oxide method. After the addition of CeO 2 , the sintering performance of the ceramics is improved. The ceramics can be well sintered at a higher tem…
Intrinsic tendency of magnetoelectric (ME) coupling in a given multiferroic system is difficult to experimentally substantiate because it represents the degree of coupling between polarization and magnetization vectors in the absence of any probing field. To assess the degree of this intrinsic coupling in a multiferro…
We find the analytical expression for the threshold intensity necessary to launch ultraslow light pulses in a metamaterial with simultaneous cubic electric and magnetic nonlinearity. The roles played by the permittivity, the permeability, the electric cubic nonlinearity, the magnetic cubic nonlinearity and the pulse d…
A self-assembly method is demonstrated to link nanoparticles into nanostructure of nanochain or nanosphere. Gold nanoparticles were covered with capping molecules by forming Au–S bonds with thiol group at one terminate. Another terminating group, carboxylic acid, showed strong complex interaction with inorganic linker…
Temperature-dependent cw- and time-resolved photoluminescence (PL), as well as optically detected magnetic resonance (ODMR) measurements are employed to evaluate effects of deuterium (2H) doping on optical properties of ZnCdO∕ZnO quantum well structures grown by molecular beam epitaxy. It is shown that incorporation o…
Rubber reinforcing carbon black N330 was treated by physical activation under <TEX>$CO_2$</TEX> to different degrees of burn-off. The mechanical properties indicating the reinforcement of SBR (Styrene-Butadiene Rubber) vulcanizates filled by activated carbon blacks, such as tensile strength, modulus at 300% strain and…
Contact angle is the primary parameter that characterizes wetting; however, the measurement techniques have been limited to droplets with a diameter as low as about 50 μm. The authors developed an atomic force microscopy-based technique to measure the contact angle of micro- and nanodroplets deposited using a modified…
Heusler half-metals are promising for spintronic applications. Epitaxial thin films of the exemplar compound Co2Cr0.6Fe0.4Al (CCFA) were investigated using conversion electron Mössbauer spectroscopy to clarify the factors influencing the spin polarization. CCFA films were deposited by rf magnetron sputtering on MgO su…
We report a design and fabrication strategy for creating single-layer metallodielectric nanostructures with dual-band filtering properties at midinfrared wavelengths. Genetic algorithm optimization was used to determine an arrangement of nanometer-scale metal pixels within one unit cell of a two-dimensional periodic a…
( 5 at. % ) cobalt-doped LiNbO3 (Co:LN) films were prepared by combinatorial laser molecular-beam epitaxy on Si (100). The Co:LN films with Co2+ replacing Nb exhibit room temperature ferromagnetism of 1.2μB∕Co and Curie temperature of ∼540K. Through a Ag∕Co:LN∕Si metal-ferroelectric-semiconductor field effect transist…
When carbon nanotube field emitters are operated, a few highly protruded ones generate most of the emission currents that cause spatial nonuniformity and fast decay in lifetime behavior. We present a cost-effective means to solve this problem using selective oxidation on those nanotubes emitting higher currents, which…
Viewing-angle controllable liquid crystal display (LCD) without using an additional panel or pixel division is proposed. In the device, hybrid aligned nematic liquid crystal using a liquid crystal with negative dielectric anisotropy is used. The device shows narrow viewing angle when it is driven only by fringe-electr…
Capillary tubes have many advantages over multi-well plates for macromol-ecular crystal growth and handling, including the possibility of in situ structure determination. To obtain complete high-resolution X-ray data sets, cryopreservation protocols must be developed to prevent crystalline ice formation and preserve m…
Commercial LaAlO3 substrates were thermally cycled simulating a procedure similar to those followed during TiO2 and SnO2 dilute magnetic semiconductors’ film pulsed laser deposition. Ferromagneticlike behavior was found in some substrates, in which metallic iron impurities were detected by x-ray photoelectron spectros…
The surface electronic structure of ZnO nanoparticles has been studied with photoemission and x-ray absorption spectroscopies. Contrary to expectation, ZnO:Zn phosphor nanoparticles were found to contain a lower oxygen vacancy density on the surface than undoped ZnO counterparts, but oxygen vacancies are in different…
First principles molecular dynamics simulations are used to determine the relative stability of wurtzite, graphitic, and rocksalt phases of the CdS nanostructure at various temperatures. Our results indicate that in the temperature range from 300to450K, the phase stability sequence for the CdS nanostructure is rocksal…