Materials Literature
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We measured dielectric, magnetic, and microwave properties of Co2U hexaferrite (Ba4Co2Fe36O60) polycrystalline bulk and composite thick film samples, and studied the effect of annealing temperature on phase formation and microstructure. We synthesized the bulk samples from a precursor prepared by the citrate method. T…
The authors use the PQEq force field based on quantum mechanics studies to provide a first-principles description of the 90° domain wall in barium titanate. Using periodic cells with lengths of up to 74nm (5120 atoms), the authors find that the domain wall thickness is 21nm in which the polarization switches over a 5n…
Zn 1 − x Cd x O films (0⩽x⩽0.179) were grown on Si (001) substrates at 750°C with a radio-frequency reactive magnetron sputtering method. Difference between the photoluminescence (PL) spectra taken at room temperature (RT) and at 12K is reported and is deduced to be the result of PL emission from the ZnCdO phases with…
The authors compare the surface and optical properties of the Zn-polar (0001) and O-polar (0001¯) surfaces of bulk ZnO samples. For optical characterization, steady-state photoluminescence using a He–Cd laser was measured at 15 and 300K. At room temperature, the (0001¯) surface demonstrates nearly double the near-band…
We present the results of our extensive investigations into the phase behavior of several “robust” five-ring banana-shaped compounds. Six homologous series of either symmetric or non-symmetric bent-core molecules, comprising a laterally substituted 1,3-phenylene ring as the central unit covalently linked to thermally…
Nanodiamonds with sizes of 3–6nm were prepared by irradiating graphite suspension using a long-pulse-width (1.2ms) laser at room temperature and normal pressure. The low power density and long pulse laser generated a lower temperature and a lower pressure, which determine the stable size of nanodiamonds. On the other…
Molecular dynamics simulations of the initial stages of the spall process in single nanocrystals and polynanocrystals of copper are performed. The simulations show that void nucleation in copper polynanocrystals occurs predominantly along the grain boundaries, whereas voids are formed at stacking fault intersections i…
( 2 ¯ 01 ) -oriented β-Ga2O3∕GaN thin films were epitaxially grown by pulsed laser deposition. These films have the specific in-plane orientation, which was confirmed by φ scans of Ga2O3 (111) and (3¯11) reflections. When oxygen flow rate was increased, the surface morphologies and roughness of β-Ga2O3 drastically cha…
We report the first use of inorganic fluorescent lanthanide (europium and terbium) ortho phosphate [LnPO4.H2O, Ln = Eu and Tb] nanorods as a novel fluorescent label in cell biology. These nanorods, synthesized by the microwave technique, retain their fluorescent properties after internalization into human umbilical ve…
The effect of high-energy proton irradiation on the physical properties of carbon nanotubes (CNTs) was investigated. The focus of the study was on the electrical properties of single-walled carbon nanotube (SWNT) network devices exposed to proton beams. Field-effect transistors (FETs) of network type were fabricated u…
Nanostructured tungsten trioxide thin-film electrodes are prepared on conducting glass substrates by either potentiostatic electrodeposition from aqueous solutions of peroxotungstic acid or direct deposition of WO3 slurries. Once treated thermally in air at 450 degrees C, the electrodes are found to be composed of mon…
We show that knowledge of the phase behavior of a protein allows one to create a rational screen that increases the success rate of crystallizing challenging proteins. The strategy is based on using microfluidics to perform large numbers of protein solubility experiments across many different chemical conditions to id…
The control exerted by some invertebrates on the calcium carbonate polymorph produced is intriguing but not understood. Mytilus edulis shells, with the abrupt polymorph switch within their valves from an outer calcite to inner aragonite layer, are excellent examples of this phenomenon. Detailed crystallography of inta…
The authors have characterized field emission properties of freestanding, 1nm thick graphene layers, called carbon nanosheets (CNSs), which were grown perpendicular to the growth surface using a radio-frequency plasma-enhanced chemical vapor deposition technique. The CNSs are metallic impurity-free and have uniform he…
Vertically aligned ZnO nanorod arrays with rod lengths in the range of 200–1500nm were fabricated by a hydrothermal method. No stimulated emission was observed in as grown nanorods. Annealing of the rods in forming gas and oxygen significantly affected their optical properties and enabled the achievement of stimulated…
The elastic constants of ZnO nanostructures control their elastic energy and thereby are important to their function in converting strain energy to electricity. This letter presents the size dependence of Young’s moduli of ZnO nanoplates, according to density-functional-theory-based ab initio calculations. Our results…
Included in the meeting: The specific inclusion of adamantane by cyclodextrins is used to direct nanocrystals to self-assemble into macroscopic monolayers at the water/oil interface. The use of functionalized cyclodextrins allows stepwise interfacial self-assembly of different nanocrystals into macroscopic heterogeneo…
Thin films of 9.5% yttria-doped zirconia in the range of 17–210nm thickness were deposited on MgO (100) substrates by electron beam evaporation. The conductivity of the films was found to increase as the film thickness decreased. The films were found to be a mixture of both cubic and tetragonal phases. The impedance a…
Mn-doped Ga2O3 (7 cation % of Mn) thin film has been grown on c-cut sapphire substrate using pulsed-laser deposition technique. Electron diffraction analyses by transmission electron microscopy found that the Mn-doped film shows γ phase with spinel structure, which is different from undoped film showing β phase. No se…
The authors have synthesized epitaxial CoFe2O4 films on piezoelectric BaTiO3 single crystal substrates as a model magnetoelectric system. The BaTiO3 substrate provides a surface lattice that can be dynamically changed in an attempt to alter the strain state and hence the magnetization of the CoFe2O4 film. Magnetizatio…