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。
Contracting porphyrins: An important step on the way to the as-yet unrealized contracted porphyrin, the so-called subporphyrin, is a tribenzosubporphyrin (see structure). The new system, which is closely related to boronsubphthalocyanines, comprises a 14-π-electron aromatic core and adopts a nonplanar bowl-shaped conf…
We report a breakthrough in fabricating ZnO homojunction light-emitting diode by metal organic chemical vapor deposition. Using NO plasma, we are able to grow p-type ZnO thin films on n-type bulk ZnO substrates. The as-grown films on glass substrates show hole concentration of 1016–1017cm−3 and mobility of 1–10cm2V−1s…
The present study describes a stabilization of single quantum dot (QD) micelles by hydrophobic silica precursors and an extension of the silica layer to form a silica shell around the micelle. The obtained product consists of up to 92% of single nanocrystals (CdSe, CdSe/ZnS, or CdSe/ZnSe/ZnS quantum dots) in the silic…
The course of aniline oxidation with ammonium peroxydisulfate in aqueous solutions has been investigated. The reaction was terminated at various times and the intermediates collected. Besides the precipitates, the films deposited in situ on silicon windows have also been studied. The kinetic course of polymerization i…
The photoresponse in the electrical conductivity of a single-walled carbon nanotube (SWNT) film is dramatically enhanced when the nanotube film is suspended in vacuum. We show here that the change in conductivity is bolometric (caused by heating of the SWNT network). Electron-phonon interactions lead to ultrafast rela…
We investigated the Surface-enhanced Raman Spectroscopy (SERS) spectrum of ethephone (2-chloroethylphosphonic acid). We observed significant signals in the ordinary Raman spectrum for solid-state ethephone as well as when it was adsorbed on a colloidal silver surface, strong vibrational signals were obtained at a very…
Inelastic neutron scattering is used to study excited spin multiplets and low-energy phonons in the ${\mathrm{Fe}}_{8}$ nanomagnet. The energies of the three lowest-lying excited multiplets are determined. In addition, we find weakly dispersive optical phonons with energies lower than the anisotropy splitting of the g…
Abstract In this work, the adsorption behavior at the silver/toluene and alumina/toluene interface of polystyrene–polyethylene oxide (PS‐PEO) diblock copolymers of various molecular weights was investigated by implementation of the surface plasmon resonance (SPR) technique. This was accomplished under a careful choice…
Photonic antenna: Ru-based stopcocks are electrostatically bound to the negatively charged one-dimensional channels of zeolite L crystals (see figure). The authors show that the quenching of the luminescence of the stopcock molecule is much weaker when it is bound to zeolite L.
ZnO–SnO 2 films were deposited onto glass substrates by filtered vacuum arc deposition. The source was equipped with a 70 at% Zn and 30 at% Sn cathode that was the source of Zn and Sn ion beam. Arc current was 200–300 A. The oxygen background pressure was 4–8 mTorr. The deposition time was 60 or 120 s, resulting in fi…
A study of the temperature dependence of the electron beam induced deposition (EBID) of tungsten was carried out in a temperature range of −30–75°C under two conditions of beam energy and beam current using WF6 as the precursor gas. An Arrhenius relationship was found for the temperature dependence of the deposition r…
Abstract A facile, self‐sacrificing template route has been developed to synthesize spinel M II In 2 S 4 (M II = Mn, Zn, Cd, Fe, Co, Ni) and M I In 5 S 8 (M I = Cu, Ag) porous microspheres. The BET surface areas of the products are around 70 m 2 g –1 . The urchin‐like In 2.77 S 4 microspheres precursor acts as both st…
Amorphous films with compositions (As0.33S0.67)100−xTex (x = 0, 1, 5 and 10 at.%) and GexSb40−xS60 (x = 10, 20 and 30 at.%) have been prepared by thermal evaporation. The compositional dependences of their optical properties, with increasing Te and Ge content, respectively, are explained in terms of the modifications…
Electromagnetic wave absorption properties of carbon powder from catalysed carbon black in X and Ku bands, Wen, Bin, Zhao, Jijun, Duan, Yuping, Zhang, Xingguo, Zhao, Yanbo, Dong, Chuang, Liu, Shunhua, Li, Tingju
Nanocrystalline p-type arsenic-doped ZnO (ZnO:As) films have been synthesized on (0001) sapphire substrates by pulsed laser deposition using a ZnO target mixed with 6.6wt% As2O3. The process of synthesizing p-type ZnO:As films was performed in an ambient gas of ultrapure (<99.99%) oxygen. The ambient gas pressu…
This paper describes the concentration dependences of piezoelectric coefficients, squared figures of merit and electromechanical coupling factors which have been calculated for 1–3 and 1–0–3 piezo-active composites based on single crystals of relaxor-ferroelectric solid solutions of (1 − x )Pb( A 1/3 Nb 2/3 )O 3 – x P…
ZnS : Mn nanophosphor has been doped with quencher impurity Ni using the colloidal precipitation method with capping agent polyvinylpyrrolidone. The formation of ~2.5 nm sized nanoparticles has been confirmed by x-ray diffraction and transmission electron microscope studies. Energy and time resolved photoluminescence…
Abstract The aim of this work is to investigate the effect of the molecular structure of polyethylene on the crystallization kinetics. In static conditions, the increase of the degree of branching leads to the decrease of the crystallization temperature, the melting temperature, and the crystallinity. Indeed, the crys…
Abstract Poly(diethylene terephthalate‐ co ‐thiodiethylene terephthalate) (PDET/TDET) copolymers of various compositions were synthesized and characterized in terms of chemical structure and molecular weight. The thermal behavior was examined by thermogravimetric analysis and differential scanning calorimetry. All the…
To solve the problem of the large environmental burden in the disposal of FRP (Fibre Reinforced Plastics), natural fibre and biodegradable resin have received a lot of attention as easily degradable materials in the natural environment. To enlarge the usage of the composites based on natural fibre and biodegradable re…