Materials Literature
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The pairing symmetry of ${\text{BaFe}}_{2\ensuremath{-}x}{\text{Co}}_{x}{\text{As}}_{2}$ was investigated by Raman scattering. The gap structure appears only in the ${B}_{2\text{g}}$ symmetry inconsistent with Muschler et al. [Phys. Rev. B 80, 180510(R) (2009)]. They concluded that the gap symmetry is the extended $s$…
Single crystals of ${\text{SrFe}}_{2\ensuremath{-}x}{\text{Pt}}_{x}{\text{As}}_{2}$ $(0\ensuremath{\le}x\ensuremath{\le}0.36)$ were grown using the self-flux solution method and characterized using x-ray crystallography, electrical transport, magnetic susceptibility, and specific heat measurements. The magnetic/struct…
Three sets of novel side-chain liquid crystalline polymers with monosubstituted azobenzene moieties in the side-chain have been studied. These are poly(p-(4′-methoxy-4-oxyhexyloxy azobenzene) benzyl methacrylate) (PPHABM), poly(m-(4′-methoxy-4-oxyhexyloxy azobenzene) benzyl methacrylate) (PMHABM) and poly(o-(4′-methox…
ZnO thin films were epitaxially grown on (001) GaAs substrate by laser molecular beam epitaxy with SrTiO3 (STO) as a buffer layer. The interface properties of ZnO/GaAs heterostructure are greatly improved by inserting STO buffer layer. The interfacial effects on the transport and dielectric characteristics of the hete…
The crystal and electronic band structures as well as the transport properties of the recently synthesized layered radical cation salt $\ensuremath{\kappa}\text{\ensuremath{-}}{(\text{BETS})}_{2}\text{Mn}{[\text{N}{(\text{CN})}_{2}]}_{3}$ are investigated. It is shown that this salt is more anisotropic in the plane of…
Nanoscale hydride systems have recently gained increased attention for their possible energy storage applications. In the present work, nanoscale particles of Mg( 11 BD 4 ) 2 infiltrated into an activated carbon scaffold were studied by small-angle scattering techniques, and their behavior was compared with that of th…
The electrical and dielectric properties of hot‐pressed composites containing alumina and silicon carbide (SiC) whiskers were characterized over a wide frequency range (0.1 Hz–1.8 GHz). The results were correlated to the average distances between SiC inclusions which were measured by stereology as a function of orient…
Detailed measurements of photoinduced fluidity in Ge-Se glasses were performed using a novel shear relaxation test in torsion mode. It is shown that photofluidity is significant even at a very low intensity and that there is no apparent threshold for activating the photostructural processes. Instead, the mechanism of…
Morphology‐controlled zinc oxide (ZnO) structures, including micrometer‐sized rods, nanorods, urchin‐like structure, flower‐like structure, and fan‐shaped structure, have been synthesized by a hydrothermal method without the use of a surfactant or an amine salt. The morphology control has been achieved by simply varyi…
IMPORTANCE OF THE FIELD: Over the past years, extensive research has been directed towards tissue engineering using conventional scaffolds. In-depth studies in this field have led to the realization that in vivo cells interact with the extracellular matrix, composed of nanofibers at sub-micron scale, which not only pr…
In this paper, we report the fabrication and characterization of Schottky rectifying junctions between semiconducting, modified single-layer graphene and a metal. The pristine, semimetallic behavior of graphene is altered by controlled exposure to an oxygen plasma, resulting in the opening of an optical band gap as sh…
A polymer-stabilised cholesteric liquid crystal (PSChLC) was fabricated by ultraviolet (UV) induced polymerisation of photopolymerisable acrylate monomers mixed in a cholesteric liquid crystal (ChLC). A polymer network with a concentration gradient, which was induced by UV light absorption of dye along the propagation…
One of the key objectives in developing solid oxide fuel cells and oxygen membranes is the improvement of ionic conductivity in electrolyte materials. Optimization of such materials relies on the understanding of the oxygen−ion diffusion mechanisms at the atomic scale. Getting a clear physical−chemical picture is thus…
Abstract Bifunctional couplers based on carbonate chemistry – Series A, B, and C – that are able to combine molecules bearing amine groups via substitution and addition reaction (Series A) or only via addition (Series B and C) were synthesized and characterized. The reactivity and selectivity of the two functional gro…
A new class of peptide-based dendrons and dendrimers is presented that display unique vesicle-driven organogelation. We demonstrate the crosslinking of diacetylene-based dendrimers in the gel state, producing strongly fluorescent polydiacetylenes. The crosslinked gels crafted from peptide dendrimers may find practical…
Deprotonation of [Et(3)NH][C(5)(CN)(5)] with metal bases provides a very simple approach to coordination compounds containing the pentacyanocyclopentadienide anion [C(5)(CN)(5)](-) (1). The three-dimensional polymer [Na(thf)(1.5)(1)](∞) and the molecular dimer [{(tmeda)(2)Na(1)}(2)] are obtained by reaction of this pr…
The spectrum of quantum dots made from semiconductors such as HgTe and HgS changes from negative gap to positive gap with decreasing size. Furthermore, intrinsic surface states, which are not related to dangling bonds, appear in the negative-gap regime. We investigate theoretically the evolution of the spectrum of HgS…
The complex dielectric response of ultrafine grain barium titanate ceramics is investigated using broadband dielectric spectrometer. Extrinsic effects like conduction, space charge associating with grain boundaries are discussed. One dielectric relaxation ascribes to the interaction of defects with grain boundaries, f…
PbSe/CdSe core/shell colloidal quantum dots (QDs) are used as a model system to study the absorption coefficient of colloidal QD heterostructures, consisting of at least two semiconductor materials. We show that at energies far above the band gap (3.1 and 3.5 eV) the experimental intrinsic absorption coefficient is in…
The geometry and formation energies of intrinsic defects in ZnO nanowires have been investigated with the self-consistent-charge density functional tight-binding method (SCC-DFTB). We have calculated the atomic relaxations and formation energies for neutral and charged defects using an empirical potential alignment pr…