Materials Literature
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A very recent report on the observation of superconductivity in Bi 4 O 4 S 3 [ Mizuguchi, Y.; http://arxiv.org/abs/1207.3145 ] could potentially reignite the search for superconductivity in a broad range of layered sulfides. We report here the synthesis of Bi 4 O 4 S 3 at 500 °C by a vacuum encapsulation technique and…
We propose the concept and design of terahertz (THz) phase shifters for phased antenna arrays based on integrally-gated graphene parallel-plate waveguides (GPPWGs). We show that an active transmission-line may be realized by combining GPPWGs with double-gate electrodes, in which the applied gate voltage can control th…
The low thermal conductivity of polymers will be one of the major roadblocks for the polymer-based microelectronics and macroelectronics due to the limited heat spreading capability. Despite that the thermal conductivity of bulk polymers is usually low, a single extended polymer chain could have very high thermal cond…
Coordination polymer coated mesoporous silica nanoparticles for drug delivery are successfully synthesized. The system ensures that drugs are stored in the mesopores under a physiological environment. Upon H(+) stimulus in the endosomal and lysosomal compartments, the drugs are released into the intracellular organell…
Giant tunnel magnetoresistance (TMR) ratios of up to 1995% at 4.2 K and up to 354% at 290 K were obtained for epitaxial Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions (MTJs) featuring a reduced lattice mismatch in the MTJ trilayer by introducing a thin Co2MnSi lower electrode deposited on a Co50Fe50 buffer layer. The o…
To understand the effect of point defects on the Li adsorption on graphene, we have studied the adsorption and diffusion of lithium on graphene with divacancy and Stone–Wales defect using the first-principles calculations. Our results show that in the presence of divacancy Li adatom energetically prefers the hollow si…
We demonstrate that functionalized pyrene derivatives effectively stabilize single- and few-layer graphene flakes in aqueous dispersions. The graphene/stabilizer yield obtained by this method is exceptionally high relative to conventional nanomaterial stabilizers such as surfactants or polymers. The mechanism of stabi…
The Schottky barrier height of Au deposited on (100) surfaces of n-type β-Ga2O3 single crystals was determined by current-voltage characteristics and high-resolution photoemission spectroscopy resulting in a common effective value of 1.04 ± 0.08 eV. Furthermore, the electron affinity of β-Ga2O3 and the work function o…
The complex refractive index components, n and k, have been studied for thin films of several common dielectric materials with a low to medium refractive index as functions of wavelength and stoichiometry for mid-infrared (MIR) wavelengths within the range 1.54-14.29 μm (700-6500 cm(-1)). The materials silicon oxide,…
A fundamental understanding of the luminescence of Au-thiolate nanoclusters (NCs), such as the origin of emission and the size effect in luminescence, is pivotal to the development of efficient synthesis routes for highly luminescent Au NCs. This paper reports an interesting finding of Au(I)-thiolate complexes: strong…
A well-defined notion of chemical compound space (CCS) is essential for gaining rigorous control of properties through variation of elemental composition and atomic configurations. Here, we review an atomistic first principles perspective on CCS. First, CCS is discussed in terms of variational nuclear charges in the c…
International audience
High-temperature Oxidation and Novel Protective Coatings of Fe-Cr Ferritic Steels as Metallic Interconnect Materials for SOFC Applications
In order to investigate the compression responses of series cushioning structures,a virtual mass method was proposed on the basis of constitutive relationship of the fundamental materials.By introducing virtual masses into the model,the quasi-static compression of the structures was represented by dynamic equations,wh…
In order to confirm the controlling factor of steel corrosion rate in concrete,variation of cathodic and anodic polarization curves and corrosion rate of active steel under different relative humidity was analyzed with the polarization curve diagrams.Based on metal corrosion theory,the corrosion mechanism of the reinf…
We prove detailed analysis of a waveguide-based Schottky barrier photodetector (SBPD) where a thin silicide film is put on the top of a silicon-on-insulator (SOI) channel waveguide to absorb light propagating along the waveguide. Taking both the confinement factor of light absorption and the wall scanning induced gain…
International audience
Heller et. Al. (Science 311, 508 (2006)) demonstrated the first DNA-CN optical sensor by wrapping a piece of double-stranded DNA around the surface of single-walled carbon nanotubes (CN). This new type of optical device can be placed inside living cells and detect trace amounts of harmful contaminants by means of near…
Friction reduction within the power cylinder assembly of internal combustion engines continues to be a one of the foremost focuses of engine manufactures. In an effort to better address this topic previously developed bench test rigs, such as the Falex, Cameron-Plint, and EMA-LS9 [1,2], have been utilized. These devic…
Multistabile molekulare Materialien bieten vielversprechende Perspektiven für die Erforschung von Festkörperphänomenen und Anwendungen in molekularen Funktionseinheiten. In der Zuschrift auf S. 10301 ff. stellen C. J. Kepert et al. eine Metall-organische Gerüststruktur mit einem einzigartigen dreistufigen Spin-Crossov…