Materials Literature
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We present experimental and theoretical studies of Pd/Cu(100) and Cu/Pd(100) heterostructures in order to explore their structure and misfit strain relaxation. Ultrathin Pd and Cu films are grown by pulsed laser deposition at room temperature. For Pd/Cu, compressive strain is released by networks of misfit dislocation…
The boundary conditions, customarily used in the Landau-type approach to ferroelectric thin films and nanostructures, have to be modified to take into account that a surface of a ferroelectric is a defect of a field type. The surface (interface) field is coupled to a normal component of polarization and, as a result,…
Electronic states in boron-nitride and boron-carbon-nitride nanoribbons with zigzag edges are studied using the extended Hubbard model with nearest neighbor Coulomb interactions. The charge and spin polarized states are considered, and the phase diagram between two states is obtained. Next, the electric capacitance is…
A recent single quantum wire is of sufficient quality to reveal new details of the photoluminescence (PL) evolution with increasing electron--hole (e--h) pair density. At a pair density of 3.6 $\times$ 10$^{3}$ cm$^{-1}$, the PL is characteristic of biexcitons shifted below the exciton peak by the 2.8-meV biexciton bi…
Abstract Ultrafine fibers produced by electrospinning often exhibit bead‐on‐string structures, which have generally been considered to be undesirable “by‐products” or defects. Theoretical analysis in the literature predicted three types of instabilities for an electrically driven jet: the axisymmetric Rayleigh instabi…
An optical investigation of the properties of europium (II) ions introduced in Ba 2 Mg 3 F 10 single crystals is presented. The spectra and time-dependence of both the inter-configurational (f–d) and the intra-configurational (f–f) transitions are described. The emission spectrum consists of two emitting Eu 2+ centres…
We study tagged particle diffusion at large packing fractions, for a model of particles interacting with a generalized Lennard-Jones 2 n – n potential, with large n . The resulting short range potential mimics interactions in colloidal systems. In agreement with previous calculations for short range potentials, we obs…
In the Na x CoO 2 chemical system, a two-phase region is found at ambient temperature near x = 0.75. The manner in which that two-phase region is formed on cooling from a uniform single phase at temperatures above 340 K is reported here. The driving force that induces the phase separation appears to be a difference in…
Nitrogen doped n-type amorphous carbon (n-C:N) films are deposited by a pulsed laser deposition technique at room temperature using a camphoric carbon target with different nitrogen partial pressures (NP) in the range from 0.1 to 800 mTorr. The room temperature conductivity (σ RT ) is found to increase with N incorpor…
The effect of impurities on the phase transitions in the ferroelectric semiconductors TlInS2 and TlGaSe2 , Babaev, S S, Başaran, E, Mammadov, T G, Mikailov, F A, Salehli, F M, Seyidov, MirHasan Yu, Suleymanov, R A
The regrowth of carbon nanotubes (CNTs) in a second growth stage after a first growth stage has been completely stopped has been found to be strongly related to the carbon capping present on their catalyst particles. It is shown that the undesirable carbon capping can be prevented from forming or removed and the nanot…
Abstract The irradiation with linearly polarized ultraviolet light and subsequent annealing generated a large cooperative reorientation of a photo-cross-linkable polymer liquid crystal (PLC) film doped with a dichroic dye. The resultant film exhibited polarization efficiency of 98.1% and can be applicable to a linear…
Brillouin spectra of stishovite were measured up to the amorphization temperature ( K) using large (1 mm) defect-free single crystals. At room temperature the sound velocities extracted from the BLS yield all six elastic constants. The derived bulk modulus and the polycrystalline shear modulus of stishovite at ambient…
The thermal decomposition kinetics of N(2)H(5)[Ce(pyrazine-2,3-dicarboxylate)(2)(H(2)O)] (Ce-P) have been studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), for the first time; TGA analysis reveals an oxidative decomposition process yielding CeO(2) as the final product with an act…
Abstract Au nanoparticles, covered with cationic dichain surfactant on the whole surface, were treated with UV/ozone. FT-IR spectra of the Au nanoparticles with bottom-, upper-, and fully covered surfactant monolayers revealed a variable decomposition rate. The sum frequency generation spectra of the treated nanoparti…
We have investigated the thermoelectric power (TEP) and the electrical conductance of single-walled carbon nanotube (SWNT) strands containing large numbers of aligned crystalline ropes. A linear temperature dependence of TEP and a power-law behaviour of conductance were observed at low temperatures. The TEP increases…
High-resolution near-edge x-ray absorption fine structure (NEXAFS) at MnK edge is employed to probe the local environment of Mn dopant in ZnO. First-principles supercell calculations are systematically made to obtain theoretical NEXAFS. Mn is found to substitute for Zn up to 5at.%Mn in polycrystalline samples sintered…
Layer-by-layer films have been constructed from a cationic diazoresin and poly(sodium 4-styrenesulfonate)-functionalized single-wall carbon nanotubes (SWNT). Raman and near-IR absorption spectra indicate that some diazonium ions reacted with SWNT during film construction. The ionic bonds in the film between diazonium…
Sequential addition of poly(diallyldimethylammonium chloride), which is highly cationic, followed by anionic carboxymethylcellulose, has been found to promote inter-fiber bonding during the manufacture of paper, with potential benefits to the recycling of fibers. The present results help to confirm a hypothesis that o…
Copper phthalocyanine (CuPc) thin films have been deposited by a recently developed plasma-based method named glow-discharge-induced sublimation (GDS). The deposition of CuPc films has also been obtained by vacuum evaporation (VE) and the comparison of the two methods shows important structural differences. FT-IR and…