Materials Literature
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PbS nanocrystals are synthesized using colloidal techniques and have their surfaces capped with oleic acid. The absorption band edge of the PbS nanocrystals is tuned between 900 and 580 nm. The PbS nanocrystals exhibit tuneable photoluminescence with large non-resonant Stokes shifts of up to 500 meV. The magnitude of…
This work demonstrated a facile route to the synthesis of polyaniline (PANI) nanofibers by polymerization of aniline using chloroaurate acid (HAuCl(4)) as the oxidant. The reduction of AuCl(4)(-) is accompanied by oxidative polymerization of aniline, leading to uniform PANI nanofibers with a diameter of 35 +/- 5 nm an…
The chemisorption of H(2) over a set of gallia polymorphs (alpha-, beta-, and gamma-Ga(2)O(3)) has been studied by temperature-programmed adsorption equilibrium and desorption (TPA and TPD, respectively) experiments, using in situ transmission infrared spectroscopy. Upon heating the gallium oxides above 500 K in 101.3…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRadiolytic Synthesis of Polyaniline Nanofibers: A New Templateless PathwaySunil K. Pillalamarri, Frank D. Blum, Akira T. Tokuhiro, J. G. Story, and Massimo F. BertinoView Author Information Departments of Chemistry, Nuclear Engineering, and Physics, University of Misso…
The crystallization and melting behavior of poly(3-butylthiophene) (P3BT), poly(3-octylthiophene) (P3OT), and poly(3-dodecylthiophene) (P3DDT) were studied. The equilibrium melting temperatures ( T m 0 ) of these polymers were measured and resulted equal to 321, 230, and 175 °C for P3BT, P3OT, and P3DDT, respectively.…
The clean surfaces of quasicrystals, orthogonal to the directions of the main symmetry axes, have a terrace-like appearance. We extend the Bravais' rule for crystals to quasicrystals, allowing that instead of a single atomic plane a layer of atomic planes may form a bulk termination.
Catalytic Pd nanoparticles in multilayer polyelectrolyte films can be easily prepared by alternating immersions of a substrate in PdCl 4 2 - and polyethylenimine (PEI) solutions followed by chemical reduction of Pd(II) with NaBH 4 . Transmission electron microscopy confirms that reduced [PdCl 4 2 - /PEI] 3 films conta…
Morphologies, growth rates, and melting of isothermally crystallized ultrathin (200−1 nm) poly(ε-caprolactone) (PCL) films have been investigated in real time by atomic force microscopy. The flat-on orientation of the lamellar crystals relative to the substrate was determined by electron diffraction. The truncated loz…
Within a nanoscale volume, an acoustic wave interacts with radiation defects in ionic solids. The radiation-induced optical absorption in ionic crystals is remarkably removed by a room-temperature ultrasonic treatment of the crystals. It is shown that the effect can be explained by defect migration processes occurring…
A family of [Pt(II)(diimine)(dithiolate)] complexes of general formula [Pt{X,X'(CO(2)R)(2)-2,2'-bipyridyl}(maleonitriledithiolate)] (where X = 3, 4, or 5 and R = H or Et) have been synthesized, spectroscopically and electrochemically characterized, and attached to a TiO(2) substrate to be tested as solar cell sensitiz…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSurfactant-Assisted Large-Scale Preparation of Crystalline CeO2 NanorodsAurélien Vantomme, Zhong-Yong Yuan, Gaohui Du, and Bao-Lian SuView Author Information Laboratory of Inorganic Materials Chemistry (CMI), The University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, B…
Nanocomposite materials provide the possibility for multifunctional properties in contrast with their more-limited single-component counterparts. Here, we report the synthesis and characterization of the first all-inorganic core/shell hybrid magnetic-optical nanoparticle, cobalt/cadmium selenide. The core/shell nanocr…
In this work, we demonstrate that cuprous oxide Cu(2)O nanospheres with hollow interiors can be fabricated from a reductive conversion of aggregated CuO nanocrystallites without using templates. A detailed process mechanism has been revealed: (i) formation of CuO nanocrystallites; (ii) spherical aggregation of primary…
This paper reports on space charge dynamics in XLPE samples, which have been pre-stressed under ac electric stress, when subjected to 30 kV/sub dc//mm dc electric stress for 24 hours. The samples used for this study were planar XLPE samples of /spl sim/220 /spl mu/m thick aged under 30 kV/sub pk//mm, 30 kV/sub rms//mm…
Abstract The dielectric spectroscopy of metal–metal sulfate LiRbSO 4 samples are described with particular emphasis on sensor performance to be used in the field of radiation. The obtained results as the effect of different electron energy beams at fixed dose, 0.5 Gy, showed abrupt change of the electrical properties…
Based on the simulation of ultraviolet (UV) radiation in the Sun's rays and in corona, the aging effect of UV radiation on composite insulators was studied in this paper, especially the effect on hydrophobicity properties. It is found that after irradiation with UV, no matter whether a short time of less than 24 hours…
The capacitance–voltage and current–voltage properties of the samples before and after annealing are investigated at 300 K and 195 K. It is found that the interface charge plays an important role for the heterojunction properties. After annealing, the samples exhibit typical junction properties. The heterojunction sho…
The angular and velocity distributions of desorbing products were analyzed in the course of a catalyzed N 2 O + CO reaction on Pd(110). The reaction proceeded steadily above 450 K, and the N 2 desorption merely collimated sharply along 45° off the surface normal toward the [001] direction. It is proposed that this pec…
Abstract Resistivity of cold‐pressed CrO 2 powder has been measured over the temperature range of 2 to 350 K with a magnetic field up of to 50 kOe. High resolution transmission electron microscopy (HRTEM) images show that the CrO 2 particles are needle‐shaped with an aspect ratio of 7:1 and have an average length of 2…
We report on the progress of a recent addition to non-volatile solid state memory technologies suited for space and other ionizing radiation environments. We summarize the material and processing science behind the current generation of chalcogenide phase-change memories fabricated on CMOS structures. The chalcogenide…