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。
Photo-induced charge transfer of positive and negative charges across the interface between an ordered organic semiconductor and a polymeric insulator is observed in the field-effect experiments. Immobilization of the transferred charge in the polymer results in a shift of the field-effect threshold of polaronic condu…
The local structures of rhombohedral, monoclinic, and tetragonal phases across the morphotropic phase boundary (MPB) of $\mathrm{Pb}({\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}){\mathrm{O}}_{3}$ are discussed in terms of the progression from short-range to long-range and back to short-range structural order. It…
A review of the main phenomena related with the linear optical properties of isolated and supported metal nanoparticles is presented. The extinction, absorption and scattering efficiencies are calculated using the Mie theory and the Discrete Dipole Approximation. The origin of the optical spectra is discussed in terms…
Granulation is a process whereby a dense colloidal suspension is converted into pasty granules (surrounded by air) by application of shear. Central to the stability of the granules is the capillary force arising from the interfacial tension between solvent and air. This force appears capable of maintaining a solvent g…
We report on an angular resolved x-ray absorption spectroscopy study of ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ thin films epitaxially grown by pulsed laser deposition on slightly mismatched substrates which induce tensile or compressive strains. XANES spectra give evidence of tetragonal distortion…
Multispeckle x-ray photon correlation spectroscopy was employed to characterize the slow dynamics of a suspension of highly charged, nanometer-sized disks. At wave vectors q corresponding to interparticle length scales, the dynamic structure factor follows a form f(q,t) approximately exp([-(t/tau)(beta)], where beta a…
The chemical reduction of H[AuCl4] with ortho-phenylenediamine in aqueous media at room temperature and ambient pressure allows the synthesis of Au nanoplates with lengths of several micrometers (see SEM image). The as-prepared nanoplates are single crystals with a preferential growth direction along the Au (111) plan…
Get turned on: Fluorescent photochromic organic nanoparticles (FPONs) of 1 (see picture) show a strongly enhanced fluorescence emission with increasing concentration and bistable photochromism. High-contrast on/off fluorescence switching has been successfully implemented in size-tuned FPONs of 1 and also in a photo-re…
We report that in addition to the fabrication of hollow nanomaterials, the Kirkendall-type diffusion can also be utilized in synthetic nanoarchitecture, through which low-dimensional nanobuilding blocks can be designed and organized chemically into complex geometrical conformations. Our approach may provide a new chem…
The discovery and chemical identification, in the 1920s, of the aliphatic polyester: poly(3-hydroxybutyrate), PHB, as a granular component in bacterial cells proceeded without any of the controversies which marked the recognition of macromolecules by Staudinger. Some thirty years after its discovery, PHB was recognize…
The magnetic properties of amorphous, crystalline (with disordered inclusions) and perfectly crystalline La0.7Ca0.3MnO3 thin films have been investigated. It was shown that the amorphous film is a paramagnet with the effective magnetic moment of 4.2μB∕Mn ion. The crystalline film with nanoscale disordered inclusions d…
A zinc-embedded silica (Zn-SiO2) nanoparticle layer has been applied as the outermost layer over the three-layer coating system, Zn-SiO2∕SiO2∕ITO (indium tin oxide), coated on a soda-lime glass substrate. The additional coating of the zinc-embedded nanoparticle layer over the 2-layer/glass, i.e., SiO2∕ITO∕glass system…
An analytical bilayer model has been developed to consider the effect of the existence of a dead layer (e.g., due to polarization degradation) at the film-electrode interface in an otherwise homogeneous ferroelectric thin film. By introducing asymmetric conductivity in the dead layer, the anomalous horizontal (along t…
The response of polycrystalline diamond detectors to low-energy x-ray beams is presented. Diamond metal∕semiconductor∕metal vertical structures have been realized to investigate the influence of the electric field in the dark and under x-ray irradiation. Nonlinear contributions to the current, compatible with field-as…
Pt ∕ ( Ba 0.7 Sr 0.3 ) TiO 3 ( BST ) ∕ YBa 2 Cu 3 O 7 - x ( YBCO ) capacitors were fabricated on (001) LaAlO3 substrates. The leakage current density-electric field characteristics were measured in the temperature range from 20 to 300K. In the electric field region of >0.7MV∕cm for positively biased Pt electrod…
We apply a first-principles method based on the density functional theory within the local spin-density approximation, and the full-potential linear augmented plane-wave method, to calculate the electronic structure and magnetic properties of dilute magnetic Al1−xMnxN alloys in the zinc-blende phase. The analyses of t…
Abstract Nonisothermal melt‐crystallization behavior of syndiotactic polypropylene (sPP) compounded with 5% by weight (wt %) of some inorganic fillers [i.e., kaolin, talcum, marl, titanium dioxide (TiO 2 ), and silicon dioxide (SiO 2 )] and 1 wt % of some organic fillers, which are some sorbital derivatives (i.e., DBS…
We performed quantum dynamics calculations on the scattering and dissociative adsorption of hydrogen molecules incident on the armchair and zigzag edges of graphite layers, using relevant potential-energy surfaces (PESs) recently obtained by Diño et al. [e-J. Surf. Sci. Nanotech. 2, 77 (2003), and references therein].…
Using an optical technique to measure hydrogen sorption kinetics the catalytic activity of the NiOx clusters is determined. The thus measured temperature dependence reveals an activation energy of 0.58 eV. The catalytic activity of NiOx clusters is studied as a function of the oxygen concentration. The surface propert…
This paper presents a 4-Mb phase-change memory experimental chip using an MOS transistor as a cell selector. A cascode bit-line biasing scheme allows read and write voltages to be fed to the storage element with adequate accuracy. The chip was integrated with 3-V 0.18-/spl mu/m CMOS technology and experimentally evalu…