Materials Literature
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Functional semiconductor β-Ga 2 O 3 nanostructures with interesting morphologies like blocks, spindles and rods were fabricated using hydrothermal process employing cationic (CTAB), anionic (SDS) and non-ionic (PEG) organic additives. Well-defined and monodispersed uniform mesoporous nanostructures of β-Ga 2 O 3 were…
Vinylidene fluoride-trifluoroethylene-chlorofluoroethylene terpolymer, P(VDF-TrFE-CFE), with small amount of CFE is utilized for thin-film nonvolatile memory. Polarization switching voltage for a 50 nm-thick film can be as low as 1 V, and is well suited for integrated driving electronics. The writing-erasing procedure…
We have proposed microscopic models for describing the multiferroic properties of BiFeO3 and GaFeO3. It is shown that the mechanisms of the multiferroism are different. In BiFeO3, the magnetoelectric coupling is biquadratic, whereas in GaFeO3 it is linear. The site disorder between Ga and Fe is a primary source of the…
Materials with strong correlations are prone to spin and charge instabilities, driven by Coulomb, magnetic, and lattice interactions. In materials that have significant localized and itinerant spins, it is not obvious which will induce order. We combine electrical transport, X-ray magnetic diffraction, and photoemissi…
A set of nanotubes with moderate contents of amorphous phases (0.4–5.1 wt %) are systematically investigated by Raman spectroscopy, kinetic thermal analysis, and complementary techniques. Results show that, in spite of their small amount, the presence of amorphous phases has a strong impact on the oxidation path of na…
The effects of solution and processing parameters on the morphology and diameter of electrospun poly(styrene-co-acrylonitrile) fibers were investigated by design of experiment. Morphology of the electrospun fiber mats were investigated by scanning electron microscopy. With increasing solution concentration, fiber morp…
Polyanilines have been prepared by catalytic oxidative polymerization of aniline in an acidic solution using H2O2 as an oxidant and ferrous sulfate as a catalyst in presence of light by photo-Fenton process. The structures of polyanilines were elucidated by UV-vis, Fourier transform infrared, and nuclear magnetic reso…
Bi-doped GeTe nanowires were fabricated using chemical vapor deposition. Composition and microstructure characterizations indicated that Bi (∼3 at. %) doping preserved GeTe rhombohedral structure with slight X-ray diffraction peak shifts, implying material parameters variation. A doping model was proposed where three…
Because most domain wall motion (extrinsic) is arrested at high bias fields, experiments were conducted to evaluate the lattice (intrinsic) contributions to the dielectric response of lead lanthanum zirconate titanate (PLZT) at 0-100 MV/m, 213-523 K, and 1-1000 kHz. The intrinsic contribution depended weakly on bias f…
Through a combination of Y zeolite precursors and the pH-adjusting method, bimodal aluminosilicates (denoted as LFs) with strong acidity and excellent hydrothermal stability were synthesized. The hydrothermal stability of the resulting aluminosilicates was improved greatly by taking advantage of Y zeolite precursors (…
This work demonstrates a polymer-stabilized blue phase (PSBP) liquid crystal phase grating, which is made of hybrid PSBPs with two different Kerr constants. The Kerr constant of a PSBP is related to the morphology of the polymer network which can be controlled by the phase separation temperature. Owing to the non-patt…
Different Raman scattering effects are observed from CdS and Mn-doped CdS nanocrystals (NCs) with an average size of 5.1 nm synthesized by the reverse-micelle method. The intensity of the longitudinal optical (LO) phonon spectrum acquired from the Mn-doped CdS NCs is more than 20 times larger than that from the undope…
Various annealing conditions (environment, temperature, and duration) are applied to study the nanoscale Kirkendall effect of copper (Cu) nanowire (NW) arrays on a Si substrate. The results show that an appropriate amount of oxygen supply is crucial for uniform transformation from Cu NWs (average diameter ∼50 nm) into…
Carrier injection from organic contacts to tetramethyltetrathiafulvalene (TMTTF) is investigated in the thin-film transistors. When 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) is patterned on a TMTTF film, the resulting (TMTTF)(TCNQ) works as highly conducting source and drain electrodes. Such self-contact transistors,…
Abstract Fluorescent silica nanoparticles (FSNs) are prepared by incorporating dye into a mesoporous silica nanoparticle (MSN) synthesis procedure. FSNs containing sulforhodamine B, hydrophobically modified sulforhodamine B, and Cascade Blue hydrazide are made. The MSN‐based FSNs do not leach dye under simulated physi…
The effects of film thickness and epitaxial strain on the magnetic properties of commensurate EuO thin films grown on single crystalline (001) yttria-stabilized zirconia (YSZ) and (110) LuAlO3 substrates are presented. Magnetic measurements show a reduction in the Curie temperature (TC) for EuO/YSZ films thinner than…
Abstract The method of atomistic molecular dynamics simulations is used to investigate the static properties of the organic–inorganic interface in a polymer nanocomposite consisting of polyimide and silica nanoparticles with modified surface. Alkylsilane chains are used as the surface modifiers. The surface density an…
In this work, the structural, electrical, and magnetic properties of orthorhombic TbMnO3 and Tb0.67Ho0.33MnO3 ceramics are presented. The lattice parameters and the Mn-O-Mn bond angle were found to decrease with Ho-substitution as evidenced by Rietveld refinement of the X-ray diffraction data and Raman spectroscopy me…
Thermoelectric elements, made of semiconductor slices laminated onto highly conductive interconnector materials, are termed composite thermoelectric device (TED). An integrated TED is a composite TED with the interconnector designed as an internal heat exchanger with flow channels directing the working fluid between t…
We explore ground-state structures and stoichiometries of the Be-B system in the static limit, with Be atom concentrations of 20 % or greater, and from P = 1 atm up to 320 GPa. At P = 1 atm, predictions are offered for several known compounds, the structures of which have not yet been determined experimentally. Specif…