Showing papers in "Solid State Communications in 2009"

TL;DR: In this article, the individual contributions of small crystallite sizes and lattice strain to the peak broadening in as-prepared and annealed ZnO nanoparticles were studied using Williamson-Hall (W-H) analysis.

TL;DR: In this paper, a solution of polyvinylpyrrolidone under sonication results in water-soluble, polymer-protected graphene single layers without oxidation or destruction of the sp2 character of the carbon core.

TL;DR: In this article, an atomistic simulation method is adopted to investigate the elastic characteristics of defect-free single-layered graphene sheet (SLGS), and the equivalent structural beam is employed to model interatomic forces of the covalently bonded carbon atoms.

TL;DR: In this paper, the charge inhomogeneity induced by spurious chemical doping or metal contacts can lead to large systematic errors in assessing graphene's transport properties and, in particular, its minimal conductivity.

TL;DR: In this article, a polyvinyl alcohol-matrix reinforced with nanodiamond (ND) particles, with ND content up to 0.6 wt%, was synthesized, and the composites were characterized by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS) with uniform distribution of the ND particles with no agglomeration in the matrix.

TL;DR: In this article, a combination of experiment and first-principles simulations is used to demonstrate that multiferroic nature emerges in intermediate size nanocrystalline BaTiO3, with ferromagnetism arising from the oxygen vacancies at the surface and ferroelectricity from the core.

TL;DR: In this paper, the dielectric and conductive properties of double perovskite ceramics were investigated together with the crystal structure, and they were well fitted by the modified Debye equation and Arrhenius law with the activation energy of 0.17 eV.

TL;DR: In this paper, the effects of substrate and temperature on Raman signatures of graphene were investigated on GaAs, glass, sapphire, standard Si/SiO2 substrates, and suspended across trenches in Si/ SiO2 wafers.

TL;DR: In this article, the first time ZnSe nanoparticles were synthesized by a microwave heating process using high purity Zn and Se powders in equimolar ratio and the particle size distribution was in the range of ∼40 to 60 nm.

TL;DR: In this article, the effect of divalent cation substitution on magnetic and magnetoelectric properties in Bi1−xAxFeO3 (A=Sr, Ba and Sr0.5Ba0.3) was investigated.

TL;DR: In this article, the presence of the edge state is experimentally confirmed in well-defined hydrogen-terminated zigzag edges by scanning tunneling microscopy/spectroscopy (STM/STS) observations.

TL;DR: In this article, the structural, electronic, and optical properties of multiferroic bismuth ferrite (BiFeO3) were investigated using density functional theory within generalized gradient approximation (GGA).

TL;DR: In this paper, the effects of the corrugations (ripples) of graphene on SiO2 on transport were evaluated by measuring the height-height correlation function, and it was shown that the Corrugations cannot mimic long-range (charged impurity) scattering effects, and have too small an amplitude-to-wavelength ratio to significantly affect the observed mobility via short-range scattering.

TL;DR: In this paper, the linear and third-order nonlinear optical absorptions in the asymmetric double triangular quantum wells (DTQWs) were investigated theoretically and the dependence of the optical absorption on the right-well width of the DTQWs was studied, and the influence of the applied electric field on the Optical absorption was also taken into account.

TL;DR: In this article, it was shown that superconducting iron selenide can only be synthesized as a pure material when near stoichiometric (i.e. FeSe).

TL;DR: In this article, the long-range nature of Coulomb impurities affects both the nature of the ground state density profile and graphene's transport properties and the ensemble averaged density profile of graphene in the presence of many randomly distributed impurities.

TL;DR: In this article, the authors showed that bulk graphite can be bonded onto borosilicate glass or potentially any insulating substrate with ionic conductivity and then cleaved off to leave single or few layer graphene on the substrate, identified optically and with Raman spectroscopy.

TL;DR: An inorganic/organic hetrojunction has been fabricated by spin coating the p-type polymer poly(3,4 ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) on an n-type zinc oxide (ZnO) film as mentioned in this paper.

TL;DR: In this paper, the claimed high-pressure metallic and superconducting phase of silane is identified as platinum hydride, that forms after the decomposition of a silane.

TL;DR: In this paper, the effects of Mg-substitution on the giant dielectric response in CaCu3Ti4O12 ceramics were investigated and discussed.

TL;DR: In this paper, the elastic deformations of graphene sheets are analyzed and shown to lead to effective gauge fields acting on the charge carriers, which can give rise to mechanical instabilities and the formation of wrinkles.

TL;DR: In this paper, the transport problem in the presence of a magnetic field can be solved with the help of a Lorentz transformation, and use it to investigate magnetotransport in p-n junctions.

TL;DR: In this paper, a polycrystalline sample of FeSe, which adopts the tetragonal PbO-type structure (P4/nmm) at room temperature, has been prepared using solid state reaction.

TL;DR: The epitaxial growth of Fe-based superconductors such as Co-doped BaFe 2 As 2 (SrFe 2As 2 :Co) was reported recently, but has still insufficient properties for a device application because they are decomposed by reactions with water vapor in an ambient atmosphere as discussed by the authors.

TL;DR: In order to enhance the ionic conductivity of polyethylene oxide (PEO) based alkaline polymer electrolytes, nanosized inorganic filler ZnS has been incorporated into PEO-KI matrix and corresponding nanocomposite polymer electrolyte is synthesized by the usual solution casting procedure.

TL;DR: In this article, the generalized gradient approximation (GGA), local density approximation (LDA) and LDA+U schemes were employed to describe the exchange correlation energy of the d 0 ferromagnetic properties of MgO containing neutral point defects.

TL;DR: In this article, a simple low-temperature chemical method was proposed to produce metastable hexagonal MoO3 phase nanorods, which exhibited phase stability up to 400 ǫC at which point an irreversible phase transition occurs to form orthorhombic MoOO3.

TL;DR: In this article, ammonium oleate surfactants can help the dispersion of multiwalled boron nitride nanotubes (BNNTs) in water to form a BNNT solution stable for several months, which was due to the non-covalent functionalization of nanotube surfaces.

TL;DR: The photoluminescent property of BiFeO 3 nanoparticles was also investigated in this paper in order to exploit their possible application in nanoscale optoelectronic devices.

TL;DR: In this paper, low temperature scanning tunneling microscopy and spectroscopy on graphene flakes supported on a graphite substrate was performed. And the degree of coupling of a graphene flake to the substrate was recognized and characterized from the appearance of an anomalous Landau level sequence in the presence of a perpendicular magnetic field.