Materials Literature
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One of the most common observations in point-contact spectra on the recently discovered ferropnictide superconductors is a large conductance asymmetry with respect to voltage across the point-contact. In this paper, we show that the antisymmetric part of the point-contact spectrum between a silver tip and an epitaxial…
In situ Raman micro-pillar compression has been shown to be capable of determining the onset of plastic deformation as well as characterizing plastic deformation and fracture. The compression experiments were carried out on 10 µm diameter single crystalline GaAs micro-pillars at room temperature. The deformation and f…
A recently developed multi-scale model has proven successful in predicting the tensile strength of a unidirectional fibre composite from fundamental molecular inputs. This technique is now extended to subtle changes in the properties of the matrix. The chemistry of the resin matrix is varied on the functional group le…
An analysis of a magnetic field sensor based on a graphene spin capacitor is presented. The proposed device consists of graphene nanoribbons on top of an insulator material connected to a ferromagnetic source/drain. The time evolution of spin polarized electrons injected into the capacitor can be used for an accurate…
A single-source precursor route has been explored by using the diphenylthiourea cadmium complex as the source of cadmium sulphide (CdS) nanoparticles. The reaction was carried out using hexadecylamine (HDA) as the solvent and stabilising agent for the particles. The phenylthiourea complex was synthesised and character…
As a humble contribution to this special commemorative issue to Professor Alfred Saupe, we present an experimental study on the critical behaviour of the nematic-to-isotropic (N–I) and smectic A-to-nematic (SmA–N) phase transitions of the liquid crystal 4-nonyloxy-4′-cyanobiphenyl (9OCB). Measurements of the specific…
The longitudinal (spin-lattice) relaxation in nuclear magnetic resonance (NMR) experiments on 4-n-pentyl-4'-cyanobiphenyl (5CB) mesogen, deuteriated in the alpha-position, has been investigated by changing the orientation of the phase director with respect to the instrumental magnetic field through the application of…
Electron holography has been shown to allow a posteriori aberration correction. Therefore, an aberration corrector in the transmission electron microscope does not seem to be needed with electron holography to achieve atomic lateral resolution. However, to reach a signal resolution sufficient for detecting single ligh…
The memory effects of gold (Au) nanocrystal (NC) non-volatile memory structures consisting of polyvinylpyrrolidone (PVP) K-30 polymer tunneling and control layers are investigated. The trilayer structure (PV P/Au-NCs + PV P/PV P) on p-type Si substrate was fabricated by spin coating, and transmission electron microsco…
The vortex chirality in an elliptical Co ring spaced 60 nm from a circular ring has been controlled by magnetostatic interaction. One of the two domain walls (DWs) in the elliptical ring interacts with a neighboring wall in the circular ring, while the other is unaffected by the stray field of the circular ring. The d…
The optical transmission properties of metal-dielectric multilayer gratings have been investigated both experimentally and numerically. A remarkable transmission resonance, which makes a significant difference from that of traditional single/triple-layer analogs, has been reported. To understand its physical origin, a…
Abstract The reaction of CuCl2·2H2O with three novel ditopic ligands, 2‐methyl‐1,4‐benzeneditetrazolate (MeBDT2–), 4,4′‐biphenylditetrazolate (BPDT2–), and 2,3,5,6‐tetrafluoro‐1,4‐benzeneditriazolate (TFBDTri2–), affords the metal–organic frameworks Cu(MeBDT)(dmf) (1), Cu(BPDT)(dmf) (2), and Cu(TFBDTri)(dmf) (3), resp…
Inverted Al0.25Ga0.75N/GaN ultraviolet (UV) p-i-n photodiodes (PDs) were grown by selective-area regrowth on p-GaN template. The inverted devices with low-resistivity n-type AlGaN top-contact layers exhibited a typical zero-bias peak responsivity of 66.7 mA/W at 310 nm corresponding to the external quantum efficiency…
In this paper, we proposed a metal-oxide-high-k-oxide-silicon (MOHOS)-type memory structure fabricating a high-k Tb2O3 charge trapping layer for flash memory applications. The high-k Tb2O3 MOHOS-type memories annealed at 800 °C exhibited large threshold voltage shifting (memory window of ∼1.41 V operated at Vg=8 V at…
We compare the degradation of organic light emitting diodes (OLEDs) by UV light and by electrical driving. We prove that the exponential dependence of the half-lifetime on the current density known from electrical aging is also valid for UV-degradation. The influence of excitons on the degradation of OLEDs is determin…
The paper by Yu and Saupe on the first biaxial nematic phase created excitement for a number of reasons. Some theories of biaxial phases already existed, but experimental observation was still lacking. The phase was discovered in a lyotropic system with three components, which in theory is difficult. Lyotropic liquid…
We observe the vacuum ultraviolet spectra of highly charged tungsten ions in plasmas at electron temperatures of 8 keV and 14 keV. The plasmas are produced by a tokamak JT-60U. The observed emission lines in a wavelength range of 2.6–3.2 nm for the plasma at 8 keV are identified to be the 3p 3/2 –3d 5/2 transitions of…
In this paper, we outline the future of modelling in reaction engineering. Specifically, we use the example of particulate emission formation in internal combustion engines to demonstrate what modelling can achieve at present, and to illustrate the ultimately inevitable steps that need to be taken in order to create a…
A type of metamaterial composing of stacked cut-wire plasmonic structures has been designed, fabricated, and characterized. The excitation of electric resonance caused by the surface plasmons effect dominates the electric field states, so that the effective refractive index can behave as a dramatic increase at visible…
We have investigated the pH and ion sensitivity of AlGaN/GaN heterostructure devices; these devices are sensitive to the ion concentration rather than to the pH of the solution. Sheet resistance as a function of pH for calibrated pH solutions and dilute NaOH, HCl, KOH, and NaCl showed an increase as a function of ioni…