Showing papers in "Solid State Communications in 2007"

TL;DR: In this article, the authors focus on the origin of the D and G peaks and the second order of D peak and show that the G and 2 D Raman peaks change in shape, position and relative intensity with number of graphene layers.

TL;DR: Graphene multilayers are grown epitaxially on single crystal silicon carbide as discussed by the authors, which is composed of several graphene layers of which the first layer is electron doped due to the built-in electric field and the other layers are essentially undoped Unlike graphite the charge carriers show Dirac particle properties (i.e., an anomalous Berry's phase, weak anti-localization and square root field dependence of the Landau level energies).

TL;DR: In this paper, a detailed transmission electron microscopy and electron diffraction study of the thinnest possible membrane, a single layer of carbon atoms suspended in vacuum and attached only at its edges, is presented.

TL;DR: Graphene is the first example of truly two-dimensional crystals as mentioned in this paper, and it is a gapless semiconductor with unique electronic properties resulting from the fact that charge carriers in graphene demonstrate charge-conjugation symmetry between electrons and holes and possess an internal degree of freedom similar to "chirality" for ultrarelativistic elementary particles.

TL;DR: In this article, the stability, band structures of few-layer graphite films, and their dependence on electric field applied along the c-axis are examined within the density functional theory. And they predict that those of Bernal type and also rhombohedral type tri-and tetra-layer graphs exhibit stability.

TL;DR: In this article, the surface energies of 40 surfaces for fcc metals Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au and Al have been calculated by using the MAEAM.

TL;DR: In this article, LiSbO3 (LS) modified KNN based ceramics were sintered at atmospheric pressure and high density (>96% theoretical) was obtained, and detailed elastic, dielectric, piezoelectric and electromechanical properties were characterized by using the resonance technique combined with the ultrasonic method.

TL;DR: In this article, the authors review the tight-binding model of bilayer graphene which determines the band structure and low energy quasiparticle properties of this material and describe the optical manifestation of the existence of a pair of split-bands and low-energy branches in the bilayer spectrum.

TL;DR: In this article, the half-integer quantum Hall (QH) effect in two-dimensional electron and hole gas is studied in high quality graphene samples and a distinctive halfinteger QH effect is discovered with QH plateaus appearing at a filling factor sequence, ν = 4 (n + 1 / 2 ), where n is the Landau level (LL) index.

TL;DR: In this paper, Valence band measurements were performed to study the electronic structure of both stoichiometric and reduced TiO 2, and the analyses showed the presence of Ti 3d band near the Fermi level in reduced Ti 2 samples.

TL;DR: The surface of boron nitride nanotubes (BNNTs) has been functionalized with amine groups via ammonia plasma irradiation as discussed by the authors, and the functionalized tubes were characterized by Fourier transform infrared spectroscopy and electron energy loss spectrography.

TL;DR: In this article, the frequency of the G line and especially the width of the D′ line turn out to be sensitive to single layers of a few-layer graphene flake and the reduced intensity of the dominant peak of the underlying silicon oxide.

TL;DR: In this article, an autocombustion method was used to synthesize Mn doped ZnO nanowires, which were characterized by X-ray diffraction and transmission electron microscopy.

TL;DR: Using the linear response theory, vibrational and dielectric properties are calculated for c -BN, w -BN and h -BN in this paper, and excellent agreement is found between the theory and experimental results.

TL;DR: In this paper, the electronic and structural properties of CO and NO molecules adsorbed on boron nitride nanotubes (BNNTs) and carbon doped BNNTs were investigated.

TL;DR: In this article, the optical properties of gold nanoparticles in polyvinyl alcohol (PVA) aqueous solution were observed by UV-visible absorption spectra, and the structure transformation from PVA to PVA/Au composite was characterized by Fourier transform infrared spectroscopy (FTIR).

TL;DR: In this paper, the frequency dependence of the Ge-Ge Raman mode was re-evaluated by carrying out careful corrections for residual strain shifts, and it was observed that the frequency appears to decrease monotonically as a function of the Sn concentration.

TL;DR: In this article, Co and Nb-substituted BiFeO3 polycrystalline ceramics were synthesized by a solid-state reaction, and their dielectric and magnetic properties were investigated.

TL;DR: Using a genetic algorithm followed by local optimization with density functional theory, the lowest energy structures of Ag n clusters in a size range of n = 3 - 22 were studied.

TL;DR: Using tetrabutyl titanate, calcium nitrate and copper nitrate, a gel of these compounds was obtained at room temperature which on subsequent heat treatments led to CaCu 3 Ti 4 O 12 (CCTO) powder at 900 ǫ ∘ C for 1.h as mentioned in this paper.

TL;DR: In this article, the inter-Landau level transitions observed in far-infrared transmission experiments on few-layer graphene samples show a behaviour characteristic of the linear dispersion expected in graphene.

TL;DR: In this article, the influence of CuO segregation on the dielectric and electrical properties is discussed, and three distinct contributions are ascribed to arising from domains, grain boundaries and domain boundaries.

TL;DR: In this article, the effects of Fe doping on crystallinity, microstructure and photoluminescence properties of sol-gel derived SnO2 thin films are reported.

TL;DR: In this article, a microscopic random-phase-approximation theory was used to analyze the properties of a chiral two-dimensional electron gas in density-functional-theory applications to graphene nanostructures.

TL;DR: The structures, binding energies, and magnetic moments of Fe N (N = 2 − 13, 15, 19 ) clusters have been obtained by all-electron density functional theory.

TL;DR: In this article, it was shown that when Mn atoms migrate to sites occupied in the perfect alloys by Co, these Mn atoms have spin moments antiparallel to the other transition metal atoms.

TL;DR: In this paper, uniform and smooth AlN nanosheets were fabricated on Si substrates by a vapour-phase transport method, using Al powder and ammonia as the source materials.

TL;DR: The dielectric and ferroelectric properties of (BaxSr1−x)0.77Ca0.7 and Ba0.23TiO3 ceramics with x = 0.9 and 0.8 have been studied in this paper.

TL;DR: In this article, the fractal dimension of the assembly of nanostructures in the films has been estimated from FESEM images, and the effect of post-deposition annealing temperature on the surface morphology, optical properties and fractal dimensions has been discussed.

TL;DR: In this article, the magnetic properties of the as-synthesized CuO nanorods were studied using a SQUID magnetometer and a vibrating sample magnetometer.