Materials Literature
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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…
Single walled carbon nanotubes (SWNTs) are a promising gene and drug delivery system since their physical dimensions mimic nucleic acids. Towards this aim, the hydrophobicity of SWNTs was averted by coating with ribonucleic acid (RNA) polymer [poly(rU)] or bovine serum albumin (BSA) and the consequent diffusion of the…
Abstract We report the first observation of nonlinear lasing effects – stimulated Raman scattering (SRS) in synthetic polycrystalline diamond grown by the chemical vapor deposition technique. We classify this material as a promising χ (3) ‐active medium for new generation of Raman laser converters.
Sputtering deposition of spinel ferrites leads to a combination of attractive physical properties (optical, magnetic, and semiconducting), which can be adjusted by carefully selecting the preparation conditions and stoichiometry during controlled postdeposition annealing. Thin-sputtered ferrite films are of great inte…
Abstract Poly(ethylene‐ co ‐vinyl alcohol) hollow‐fiber membranes with a 44 mol % ethylene content were prepared by thermally induced phase separation. A mixture of 1,3‐propanediol and glycerol was used as the diluent. The effects of the ratio of 1,3‐propanediol to glycerol in the diluent mixture on the phase diagram,…
We have conducted visible pump-THz (THz—terahertz) probe measurements on single wall carbon nanotubes deposited on quartz substrates. Our results suggest that the photoexcited nanotubes exhibit localized transport due to Lorentz-type photoinduced localized states from 0.2 to 0.7 THz. Upon modeling the THz transmission…
Quantitative analysis of spatially resolved valence electron energy-loss spectra shows strong physical property contrasts for $\ensuremath{\Sigma}5$ and near $\ensuremath{\Sigma}13$ grain boundaries in Fe-doped ${\mathrm{S}\mathrm{r}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$, resulting in London dispersion interaction energ…