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。
A heteroquantum-dots (HQD) model for hydrogenated nanocrystalline silicon films (nc-Si:H) is proposed. The main features of our model are as follows. (i) the nanocrystalline grains and the amorphous counterparts in which they are embedded have very different band gap and band structures. As a result, they form heteroj…
We have performed both analytically and numerically a stability analysis of the silicon-electrolyte interface for the photoelectrochemical etching of n-type Si. The model incorporates the transport of holes in the semiconductor, ion diffusion in the electrolyte, together with surface tension of silicon. A careful phys…
Single-crystal diamond has been irradiated with 4-MeV carbon ions to doses in the range (0.5--130)\ifmmode\times\else\texttimes\fi{}${10}^{16}$ ions/${\mathrm{cm}}^{2}$. With increasing implantation damage, the triply degenerate one-phonon Raman mode at 1332 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ broadens and shif…
Bei der zur Entfernung des Tensids notwendigen Calcinierung stabil ist Ti‐TMS1, das erste hexagonal geordnete, mesoporöse Übergangsmetalloxid. Die Synthese dieses neuen Materials aus Phosphat‐Tensiden und Titanalkoxiden gelang durch eine modifizierte Sol‐Gel‐Methode. Die große innere Oberfläche, die enge Porenweitenve…
A mechanism for the compressive failure of soda-lime and borosilicate glasses is proposed based upon high-speed photography of impact on glasses. Shock loading was produced by the impact of a 50 mm diameter projectile so inducing shock states of one-dimensional strain in glass targets. The shock waves and failure fron…
The shot-noise power of a diffusive conductor in a presence of both strong inelastic electron-electron and electron-phonon scattering is calculated. It is shown that electron-electron inelastic scattering does not suppress shot noise strongly and the noise power has a universal form (\ensuremath{\surd}3/2)e\ensuremath…
We have studied the systematic changes of the electronic structure in 3d transition-metal oxides and sulfides within a configuration-interaction cluster model including multiplet effects. Parameters of the model have been deduced from analyses of the 2p core-level photoemission spectra of these compounds. We have calc…
Magnetization (M) comes from both the persistent currents and the spin polarization. The spin-B interaction is important in a graphene tubule, because it makes the one-dimensional subband with the divergent density of states capable of crossing the Fermi level (${\mathit{E}}_{\mathit{F}}$=0 eV). It causes cusps in mag…
Abstract Transmission electron microscopy (TEM) was used to examine the morphology of blends of nylon 6 and polypropylene (PP) containing various maleated polypropylenes (PP‐g‐MA). The size of the dispersed polypropylene particles decreases as the content of maleic anhydride in the PP‐g‐MA increases for binary blends…
We report the fabrication, chemical, optical, and photoluminescence characterization of amorphous silicon-rich oxynitride (SiOxNy:H) thin films by plasma-enhanced chemical-vapor deposition. The film compositions were followed by changes in the refractive index. X-ray photoelectron and Fourier transform infrared spectr…
Copper nitride thin films were obtained by the reactive sputtering method. A metallic copper target was sputtered in nitrogen gas with radio-frequency (rf) magnetron sputtering equipment. Highly [100]-oriented polycrystalline films of the cubic anti-ReO3 structure were obtained. Films with a lattice constant above 3.8…
Abstract In 1926 Hans Fischer and Bruno Walach synthesized the first porphyrins. H. Fischer, B. Walach, Justus Liebigs Ann. Chem. 1926 , 450 , 164–181. Currently more than 1400 new articles concerning the synthesis and uses of porphyrins are published every year. CAS Online search for 1994 . However, the strong intere…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen-Sensitive Luminescent Materials Based on Silicone-Soluble Ruthenium Diimine ComplexesIngo. Klimant and Otto S. WolfbeisCite this: Anal. Chem. 1995, 67, 18, 3160–3166Publication Date (Print):September 15, 1995Publication History Published online1 May 2002Published inis…
Based on a detailed analysis of polarized Raman and luminescence measurements of a ‘‘mosaic’’ diamond film, symmetry properties of a ubiquitous point defect observed in diamond films are determined. Specifically, the defect, which gives rise to emission at 738 nm, is determined unequivocally to be a 〈110〉-oriented def…
We report the fabrication and properties of three-, four-, and five-layer electroluminescent devices fabricated from light emissive N-based heterocyclic novel polymeric derivatives of PPP and PPV with which they are isoelectronic. They include poly(pyridine vinylene), (PPyV), and poly(2,5-dihexadecanoxy phenylene viny…
During the past five years, (pi) -conjugated organic polymers, such as poly[p-phenylene vinylene] (PPV) and polythiophenes, have become attractive alternatives to semiconducting materials as light-emitting diodes. Various approaches to tuning emission wavelength have been proposed, such as controlling the conjugation…
Poled guest-host polyquinoline thin films are shown to demonstrate both exceptionally large electro-optic activity and long-term thermal stability. After an initial drop from 45 pm/V to 26 pm/V in the first 100 hours, the electro-optic coefficient r<SUB>33</SUB> at 26 pm/V remained for more than 2000 hours.
We studied conductive polymers as an anti-corrosion coating on 7075-T6 aluminum alloys. A double strand polyaniline molecular complex was used as the coating material. The new double strand polyaniline complex is advantageous compared with the traditional polyaniline by improvements in processability and stability. Po…
Extensive gel permeation chromatography coupled with surface structure and mechanical property measurements clearly indicate that polyaniline in the base form has a tendency to aggregate or agglomerate as a result of intermolecular hydrogen-bonding. The aggregation is present in the solid state powder. The degree of a…
In this communication we report results obtained in our laboratory on the design, the synthesis, and the characterization of new light-emitting copolymers. We are interested in block copolymers containing well defined conjugated sequences, which give rise to luminescence. Those chromophores, which are (pi) -conjugated…