Materials Literature
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We report measurements of the temperature dependent resistivity ( T ) of a gold film 70 nm thick deposited on mica preheated to 300 °C in UHV, performed between 4 K and 300 K, and measurements of the surface topography of the same film performed with a scanning tunnelling microscope (STM). From the roughness measured…
Nitrogen incorporated amorphous carbon (a-C:N) films on silicon (111) wafer, quartz, and Ti/C substrates with nitrogen concentration up to 20 at. % are prepared by filtered arc deposition. The nitrogen concentration and area density of the films were measured by Rutherford backscattering. The electrical properties of…
A series of light emitting devices were designed and realized with a standard 2 micron CMOS technology, 1.2 micron CMOS technology and 0.8 micron Bi-CMOS integrated circuit fabrication technology. The devices operated in the reverse breakdown avalanche mode, at voltage levels of 8 - 20 V and in the current range 80 (m…
The optical band gap (Eg) of the filled tetrahedral semiconductor LiMgAs [viewed as a zinc-blende AlAs-like (MgAs)− lattice partially filled with He-like Li+ interstitials] was studied. The band gap of LiMgAs is found to be direct, with a forbidden gap of 2.29 eV at 300 K (2.38 eV at 77 K) as LiZnP predicted theoretic…
In this paper, we report the fabrication and characterization of ${\mathrm{A}\mathrm{g}/(\mathrm{B}\mathrm{a},\mathrm{S}\mathrm{r})\mathrm{TiO}}_{3}{/\mathrm{L}\mathrm{a}\mathrm{N}\mathrm{i}\mathrm{O}}_{3}{/\mathrm{L}\mathrm{a}\mathrm{A}\mathrm{l}\mathrm{O}}_{3}$ capacitors. All the films, including the top (silver) a…
Deposition of Se and GaSe on $\mathrm{Si}(111)7\ifmmode\times\else\texttimes\fi{}7$ surfaces was studied with low-energy electron diffraction, x-ray photoelectron spectroscopy, and x-ray photoelectron diffraction to probe initial nucleation and interface structure for $\mathrm{GaSe}/\mathrm{Si}(111)$ heteroepitaxy. Ro…
An ordered monolayer is found to form at the free surface of semi-fluorinated alkane melts, F(CF 2 ) 12 (CH 2 ) n H, a few degrees above the bulk freezing point. X-ray and surface tension measurements show the monolayer to assume one of two different structures, depending on n . For n ∼ 10 the structure is fully cryst…
A comparative study of the effect of annealing in reduced oxygen pressure on the electrical transport properties of (La1−xNdx)0.7Sr0.3MnO3 (x=0, 0.25, 0.5, 0.75, and 1) epitaxial thin films and bulk materials has been carried out. The epitaxial films grown by pulsed laser ablation were in situ annealed in an oxygen at…
A one-dimensional electron system at quarter-filling has been examined by applying the renormalization group method to a bosonized model with on-site (U) and nearest-neighbor (V) repulsive interactions. By evaluating both normal scattering and Umklapp scattering perturbatively, we obtain a phase diagram in which a met…
The degree of platelet adhesion and subsequent thrombus formation is an important measure of biocompatibility for cardiovascular biomaterials. Traditional methods of quantifying platelet adhesion often are limited by the need for direct optical access, limited spatial resolution, or the lack of temporal resolution. We…
LiEuPSe4, the first quaternary lithium-containing selenophosphate, was synthesized as red polyhedra by reacting Eu with a molten mixture of Li2Se/P2Se5/Se at 750 degrees C. Similarly, the reaction of Eu with a molten mixture of K2Se/P2Se5/Se at 495 degrees C produced red polyhedral crystals of KEuPSe4. Both compounds…
We designed, fabricated, and characterized a binary diffractive lens with features less than 60 nm. The lens was designed for operation in the red portion of the spectrum. Experimental measurements of lens performance agree with predictions generated by rigorous models of diffraction.
We have performed dc transport measurements on purified thick films of single-walled carbon nanotubes under hydrostatic pressures up to 2 GPa in the temperature range 4--300 K. At room temperature we have found nonmonotonic variation of the resistance with applied pressure. The resistance first drops with increasing p…
Nanocluster carbon films grown using a cathodic arc process at room temperature in the presence of background gases such as He are found to be good electron emitters. The variation in the surface morphology and the corresponding emission characteristics of the films with change in helium partial pressure (5×10−4–50 To…
A prediction method for electromigration failure in polycrystalline lines has been proposed using the governing parameter of electromigration damage, the atomic flux divergence (AFDgen), and the usefulness has been verified by experiment where various line shapes were treated under various operating conditions. In the…
A capillary zone electrophoresis/electrospray ionisation mass spectrometry (CZE/ESI-MS) method has been developed for the separation and detection of 5-aminolaevulinic acid (ALA) and porphobilinogen (PBG). Capillaries were 70 cm long with an inner diameter of 75 micrometer and outer diameter of 375 micrometer. The buf…
The title compound, [La2(C3H2O4)3(H2O)4]·H2O, forms a layer-type polymeric structure. The layers, which contain infinite puckered four-membered La—O—La—O rings in a pseudo-ternary symmetry, are formed by the lanthanum and one independent malonate group. They are interconnected by the second independent malonate group,…
Electrical transport has been investigated in amorphous ${\mathrm{Y}}_{0.19}{\mathrm{Si}}_{0.81},$ from 30 mK to room temperature. Below 2 K, the conductance G exhibits Shklovskii-Efros behavior $G\ensuremath{\sim}\mathrm{exp}[\ensuremath{-}{(T}_{0}{/T)}^{1/2}]$ at zero electric field, where conduction is expected to…
When an electrical current flows parallel to a stepped metal surface, the steps contribute to the surface-induced resistivity due to the diffuse scattering of the carriers that occurs at the step edges. In this paper, multiple-scattering theory is used to compute the surface resistivity induced by steps on the vicinal…
Using nuclear reaction analysis composition-depth profiling, we investigate the influence of symmetric/asymmetric confining walls on the equilibrium configuration of thin films of phase-separated polymer blends. Depth profiles of samples annealed under symmetric boundary conditions show a laterally averaged concentrat…