Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Phase change materials in phase change random access memory (PRAM) undergo very high electrical stress as well as thermal stress during operation. These can cause intrinsic problems in stability of the PRAM devices. We investigate the stability of Ge2Sb2Te5, the most common phase change material for PRAM, under electr…
A systematic study of the electrochemical, spectroelectrochemical and electrochromic (EC) properties of poly(alkyl-3,4-ethylenedioxyselenophene) (PEDOS-C n ) ( n = 0, 2, 4, 6, 8 and 12) films is reported. The alkyl substituents lead PEDOS-C n films to exhibit sharper redox peaks than the parent PEDOS film and raise an…
Apatite-type lanthanum silicates of general formula La 9.33+2 x /3 (SiO 4 ) 6 O 2+ x have appeared recently as a new promising class of oxide ion conductors with potential applications as electrolytes for solid oxide fuel cells (SOFCs). They have been shown to demonstrate relatively high oxide ion conductivity at mode…
We report the direct measurement of a magnetoelectric (ME) exchange between magnetostrictive CoFe2O4 nanopillars in a piezoelectric BiFeO3 matrix for single-layer nanocomposite epitaxial thin films grown on (001) SrTiO3 substrates with SrRuO3 bottom electrodes. The ME coefficient was measured by a magnetic cantilever…
The electronic structures and the ferromagnetic (FM) stability in ${\text{In}}_{2}{\text{O}}_{3}:\text{Fe}$ (IFO) with additional Cu and oxygen vacancy $({V}_{\text{O}})$ doping have been investigated using first-principles calculations within the framework of density-functional theory. It is found that pure IFO has a…
The ultraviolet (UV) emission from the Au-coated ZnO films was greatly enhanced and the visible emission was significantly suppressed compared with the un-coated ZnO films. Great changes in photoluminescence of ZnO films are attributed to the electron transfer between conduction band and defect levels through the loca…
An, aus, an, aus …︁ Ein auf Pyren basierendes kovalentes organisches Gerüst (blau Pyren, weiß B, rot O) erleichtert die Excitonenwanderung und den Ladungstransport, sammelt Photonen des sichtbaren Lichts und reagiert rasch auf die Bestrahlung mit Licht unter Erzeugung eines merklichen Photostroms. Mit dem Gerüst ist e…
Well-defined single-crystalline nanobelts with strong fluorescence were fabricated from a perylene tetracarboxylic diimide molecule modified with specific side-chains that afford flip-flap stacking, rather than the common translated stacking, between the molecules along the long axis of the nanobelt. The nanobelts thu…
Molecular dynamics (MD) simulations are presented to illustrate the pyramidal slip processes on the plane (also a twinning plane) in magnesium. The simulations reveal an interesting slip mode consisting of two separate partial dislocations that nucleate independently. These dislocations glide in a slightly corrugated…
A simple strategy for detection of glutathione (GSH) in physiologically relevant concentrations is reported by manipulating the electron transfer pathways of surface-modified quantum dots. The probe consisted of fluorescent CdS:Mn/ZnS core/shell quantum dots (Qdot) properly conjugated to dopamine through CS 2 -assiste…
XPS and acid−base titrations were used to investigate the nature and stability of oxygen-containing surface groups on carbon nanofibers (CNF) and platinum-containing CNF. During heat treatments in inert atmosphere at 973 K all acidic (carboxylic) oxygen surface groups were removed for CNF. Introduction of platinum dec…
We report Auger recombination rates for wurtzite InGaN calculated from first-principles density-functional and many-body-perturbation theory. Two different mechanisms are examined—inter- and intra-band recombination—that affect different parts of the emission spectrum. In the blue to green spectral region and at room…
We have calculated the chemical trend of magnetic exchange parameters (${J}_{dd}$, $N\ensuremath{\alpha}$, and $N\ensuremath{\beta}$) of Zn-based II-VI semiconductors $\text{Zn}A$ ($A=\text{O}$, S, Se, and Te) doped with Co or Mn. We show that a proper treatment of electron correlations by the local spin-density appro…
We studied theoretically the optical properties of ${\text{C}}_{60}$ fullerene microcrystals as a function of hydrostatic pressure with first-principles many-body theories. Calculations of the electronic properties were done in the GW approximation. We computed electronic excited states in the crystal by diagonalizing…
Ultrasmall copper nanoparticles are produced by N,N,N',N'-tetramethyl-p-phenylenediamine (TMPDA) reduction of aqueous Cu(2+) on a hydrophobically immobilized sodium dodecylbenzenesulfonate (SDBS) surfactant template in the presence of sodium citrate at room temperature. Single-walled carbon nanotubes (SWNTs) act as a…
We studied the entropy change and the shift of the martensitic transformation temperatures with magnetic field in samples of a polycrystalline Ni–Co–Mn–In alloy having different degrees of long-range atomic order due to different heat treatments. We found, for the samples of the same composition, strong variations of…
Using micron-sized Hall sensor arrays to obtain time-resolved measurements of the local magnetization, we report a systematic study in the molecular magnet ${\text{Mn}}_{12}$ acetate of magnetic avalanches controllably triggered in different fixed external magnetic fields and for different values of the initial magnet…
Mn 5 Ge 3 C x films with x≥0.5 were experimentally shown to exhibit a strongly enhanced Curie temperature TC compared to Mn5Ge3. In this letter we present the results of our first principles calculations within Green’s function approach, focusing on the effect of carbon doping on the electronic and magnetic properties…
The evolution of the Schottky barrier height (SBH) of Er silicide contacts to n-Si is investigated as a function of the annealing temperature. The SBH is found to drop substantially from 0.43 eV for the as-deposited sample to reach 0.28 eV, its lowest value, at 450 °C. By x-ray diffraction, high resolution transmissio…
We examine the appearance of a spin-density wave in the FeAs parent compounds due to an excitonic instability. Using a realistic four-band model, we show that the magnetic state depends very sensitively on the details of the band structure. We demonstrate that an orthorhombic distortion of the crystal enhances the sta…