Materials Literature
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The structural polymorphism exhibited by a thin polymer film of symmetric poly(2-vinyl pyridine- b -methyl methacrylate) (P2VP- b -PMMA), cast by spin-coating, in the presence of selective solvent CCl 4 has been investigated. Morphological features can be switched upon exposure to selective vapor. On the basis of this…
In this paper, we demonstrate a novel phase-change memory cell utilizing a low-temperaturein situdoped single crystalline germanium nanowire diode as a bottom electrode as well as a memory-cell selection device. The integrated memory cell shows promising characteristics such as low programming current, large set/reset…
The suitability of nickel as an alloying element in titanium alloys produced using the blended elemental powder metallurgy approach has been explored. Nickel initially accelerates sintering, providing greater densification at lower temperature than observed for unalloyed titanium. However, it provides only a minor imp…
Abstract Plasmon spectroscopy of the thinnest possible membrane, a single layer of carbon atoms, graphene, has been carried out in conjunction with ab initio calculations of the low loss function. We observe π‐ and π + σ‐surface plasmon modes in free‐standing single sheets at 4.7 eV and 14.8 eV which are substantially…
Polymer non-volatile memory devices in 8 × 8 array cross-bar architecture were fabricated by a non-aqueous direct metal transfer (DMT) method using a two-step thermal treatment. Top electrodes with a linewidth of 2 µm were transferred onto the polymer layer by the DMT method. The switching behaviour of memory devices…
Abstract By thermal evaporation of pure ZnO powders, high-density vertical-aligned ZnO nanorod arrays with diameter ranged in 80–250 nm were successfully synthesized on Si substrates covered with ZnO seed layers. It was revealed that the morphology, orientation, crystal, and optical quality of the ZnO nanorod arrays h…
We present electromagnetic invisible cloaks and concentrators which are composed of inhomogeneous and anisotropic metamaterials with a square-shaped outer boundary and a circular-shaped inner boundary. Using the technique of coordinate transformation, closed-form formulations of the permittivity and permeability tenso…
The impact of the submolecular electron density on the X-ray diffraction profile of a layer-stacked thin film is studied experimentally and compared with numerical simulations based on the molecular structure and angular arrangement. Important structural information is contained in the X-ray diffraction profile of hig…
This article describes a two-silane, chemical vapor deposition (CVD) approach to creating hydrophobic (or even superhydrophobic), abrasion-resistant coatings on silicon oxide and polymer (nylon) substrates. This multistep approach employs only reagents delivered in the gas phase, as follows: (i) plasma cleaning/oxidat…
A surfactant-templated route to mesostructured forms of the transition alumina phases η-Al2O3 and χ-Al2O3 is described. The surface areas and pore-size distributions of these novel forms of alumina are substantially improved with respect to those of conventional forms of these phases. Wormholelike pores are visible in…
Abstract To better understand the effect of a small amount of high‐molecular‐weight polyethylene (HMWPE) on the mechanical properties and crystal morphology under the shear stress field, the dynamic packing injection molding (DPIM) was used to prepare the oriented pure polyethylene and its blends with 4% HMWPE. The ex…
Abstract Deep level transient spectroscopies (DLTS) applied to Schottky junctions made on homoepitaxial boron‐doped diamond films show the existence of two traps. A deep acceptor, negatively charged and strongly attractive for holes, 1.57 eV above the valence band edge displays the characteristic features of a complex…
Single crystals of a new semi-organic nonlinear optical material glycine hydrobromide were grown from solution by slow evaporation at room temperature. Good optical quality single crystals with dimensions 17×8×5 mm 3 were obtained. The grown crystal had been confirmed by single-crystal X-ray diffraction and the vibrat…
Abstract Polycrystalline CVD diamond has been annealed in vacuum at temperatures t an = 1550 °C–1690 °C to investigate an influence of modifications of grain boundaries (GB) and defects on thermal conductivity and optical properties of originally optical quality material. While the sample was converted by this heat tr…
Electrochromic thin films of molybdenum oxide (MoO 3 ) were prepared on transparent conducting oxide substrates, i.e. fluorine doped tin oxide coated (FTO or SnO 2 :F) glass substrates by electron beam evaporation technique using pure MoO 3 (99.99%) pellets at various substrate temperatures (i.e. T sub =room temperatu…
This paper presents a relatively simple method to fabricate field-emitter arrays from silicon substrates. These devices are obtained from silicon micromachining by means of the HI-PS technique - a combination of hydrogen ion implantation and porous silicon used as sacrificial layer. Also, a new process sequence is pro…
The interaction between poly(ethylene oxide) (PEO) chains grafted onto polystyrene latex particles and alpha-, beta-, and gamma-cyclodextrins (CD) was studied by small-angle neutron scattering. The particles were contrast-matched to the solvent in order that only the scattering from the polymer layers was detected. Th…
Anode‐supported cone‐shaped tubular solid oxide fuel cells (SOFCs) are successfully fabricated by a single‐step cosintering process. The cone‐shaped tubular single cell, NiO+YSZ/YSZ/LSM+YSZ/LSM, is comprised of a Ni+yttria‐stabilized zirconia (YSZ) anode, YSZ electrolyte, a La 0.7 Sr 0.3 MnO 3 (LSM)+YSZ cathode layer,…
Abstract The remarkable physical properties of diamond such as tissue equivalence (atomic number Z = 6, close to that of human tissue), radiation and mechanical hardness and a wide band gap (5.5 eV) make it an ideal material for the fabrication of detectors for radiotherapy applications. However, the response to the r…
The mechanical behaviour of extruded AZ31B magnesium alloy with two different textures was studied. Acoustic emission (AE) was used to record the signals to detect the various deformation processes occurring during the mechanical test. Hierarchical clustering and Kohonen's self-organising neural network map were used…