Materials Literature
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Technologically relevant properties, such as potential discontinuity and half-metallic behavior, are determined by means of an accurate first-principles approach for Co2MnGe/GaAs and Co2MnGe/Ge interfaces. Interface states appear in both sides of the junctions, so that half-metallicity, typical of bulk Co2MnGe, is loc…
A new type of coordination network polymer involving the redox-active polyanion, PV(2)Mo(10)O(40)(5)(-), and bridging -Cu(II)(OH(2))(4)- units, [[(Cu(II)(OH(2))(4))(3)(OH)]PV(2)Mo(10)O(40)](n)() (1), has been characterized by X-ray crystallography and several other methods. It is the first efficient heterogeneous (ins…
We have studied the effects of remote hydrogen plasma treatment on the defect characteristics in single crystal ZnO. Temperature-dependent (9–300 K) and excitation intensity-dependent photoluminescence spectra reveal that H-plasma exposure of ZnO effectively suppresses the free-exciton transition and redistributes int…
We report the observation of thermally driven mechanical vibrations of suspended doubly clamped carbon nanotubes, grown by chemical vapor deposition (CVD). Several experimental procedures are used to suspend carbon nanotubes. The vibration is observed as a blurring in images taken with a scanning electron microscope.…
The effects of citric (H 3 cit), tartaric (H 2 tart), and acetic (HAc) acid on the growth of nanoparticles of calcium oxalate (CaOxa) were investigated in a lecithin−water ordered liposome system by means of X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The morpholog…
This paper reports an aggregation-based method for the fabrication of composite Au/Ag nanoshells with tunable thickness and surface roughness. It is found that the resultant roughened composite Au/Ag nanoshells can attract each other spontaneously to form films at the air−water interface. Importantly, such films can b…
Electroless plated copper can be deposited on a TaN surface initiated by displacement plating when the surface oxide layer is removed by wet chemical etching. For application to ultra-large-scale integrated (ULSI) interconnection technology in which very thin TaN barrier films are used, it is essential to form a stabl…
Abstract Mononuclear cis ‐dichloro complexes, [L n MCl 2 ], with different metal centres (Pt II , Ni II , and Zn II ) and a series of palladium and platinum derivatives, [L 2 MX 2 ], in which chloride groups are replaced with iodide, bromide, and azide ligands, have been synthesized from 4,4′‐disubstituted‐2,2′‐bipyri…
Abstract 2,2‐Bis[4(4‐aminophenoxy)phenyl]phthalein‐3′,5′‐bis(trifluoromethyl)anilide (6FADAP), containing fluorine and phthalimide moieties, was synthesized via the Williamson ether condensation reaction from 1‐chloro‐4‐nitrobenzene and phenolphthalein‐3′,5′‐bis(trifluoromethyl)anilide, which was followed by hydrogena…
Microgel-stabilised nanoclusters of Pd and Pt have been prepared starting from microgels based on N,N-dimethylacrylamide. The size of the resulting nanoclusters is controlled by the nanomorphology of the microgel stabiliser. The microgel-stabilised nanoclusters are stable over long periods of time in the solid state a…
Spectroscopic ellipsometry and scanning electron microscopy (SEM) experiments are employed to characterize porous aluminum oxide obtained by anodization of thin aluminum films. Rutherford backscattering spectra and x-ray diffraction experiments provide information on the composition and the structure of the samples. R…
The electrical properties and the structure of isothermally annealed thin films of Ge2+xSb2Te5 (x=0 and 0.5) have been studied by in situ electrical measurements, x-ray diffraction, and transmission electron microscopy analyses. Phase separation has been observed in samples with an excess of Ge; by annealing amorphous…
Magnetic anisotropy and magnetization reversal phenomena are studied in Ga1−xMnxAs films grown on GaAs(001). From the azimuthal dependence of the magneto-optical Kerr rotation and magnetic linear dichroism, the in-plane 〈100〉 directions are unambiguously assigned as axes of easy magnetization. The values of the cubic…
A new series of cationic, thermo-sensitive, and biodegradable poly(L-lactide)-poly(2-ethyl-2-oxazoline)-poly(L-lactide) (PLLA-PEOz-PLLA) triblock copolymers were synthesized by ring-opening polymerization. With increasing molecular weight and crystallinity of hydrophobic PLLA blocks, the critical micellization concent…
We examine the sizes and conformations of flexible dendrimers of generation numbers G = 4 to G = 9 by means of Monte Carlo simulations on a coarse-grained level. To this end, we introduce a simple, “bead−thread” model with variable thread-to-bead size ratio δ. In addition, we compare the results from this model to pre…
Stabilization of electroluminescence (EL) from nanocrystalline porous silicon (PS) diodes has been achieved by replacing silicon–hydrogen bonds terminating the surface of nanocrystalline silicon with more stable silicon–carbon (Si–C) and silicon–oxygen (Si–O–C) bonds without significant effects on the electrical prope…
Cross-linked polyacrylonitrile PAN granules were prepared at ambient temperature by γ-rays at a constant dose rate of 8.5 kGy/h. It was found that the rate of polymerization was linear with the radiation dose at the initial stage of polymerization, and then, at high conversion, it tends to level off above 35 kGy. Cros…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMorphological Transformation of PS-b-PEO Diblock Copolymer by Selectively Dispersed Colloidal CdS Quantum DotsSiao-Wei Yeh, Kung-Hwa Wei, Ya-Sen Sun, U-Ser Jeng, and Keng S. LiangView Author Information Department of Materials Scien…
We investigate the microdomain orientation kinetics of concentrated block copolymer solutions exposed to a dc electric field by time-resolved synchrotron small-angle X-ray scattering. As a model system, we use a lamellar polystyrene- b -polyisoprene block copolymer dissolved in toluene. Our results indicate two differ…
The isotropic–nematic phase behavior of length-polydisperse hard rods with arbitrary length distributions is calculated. Within a numerical treatment of the polydisperse Onsager model using the Gaussian trial function ansatz we determine the onset of isotropic–nematic phase separation, coming from a dilute isotropic p…