Materials Literature
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Current perpendicular to the plane, giant magnetoresistance (GMR) and the spin-valve effect were observed in Co/Cu multilayered nanowires electrodeposited into self-organized nanoporous anodized aluminium templates grown at the surface of bulk aluminium. Pores as short as 2000 nm could be used. The pore bottom oxide l…
Abstract Highly dispersed Au catalysts were active for the direct formation of H2O2 form H2 and O2. Especially, the rate of H2O2 production greatly increased when Au nanoparticles were deposited onto SiO2, MCM-41 and active carbon supports.
Strong photoluminescent emission has been obtained from 3 nm PbS nanocrystals in aqueous colloidal solution, following treatment with CdS precursors. The observed emission can extend across the entire visible spectrum and usually includes a peak near 1.95 eV. We show that much of the visible emission results from abso…
This works presents the theoretical study on several correlation integrals of the capacitance transients of the deep levels. The deconvolution of the transient signals was the major subject of the number of methods referred to under the common name as the Deep Level Transient Spectroscopy methods. In general the separ…
Highly p-type GaAs:C was ion-implanted with Mn at differing doses to produce Mn concentrations in the 1 - 5 at.% range. In comparison to LT-GaAs and n+GaAs:Si samples implanted under the same conditions, transport and magnetic properties show marked differences. Transport measurements show anomalies, consistent with o…
Density functional calculations have been performed to study the molecular structure and chemical properties of selected lanthanide(III) texaphyrins (Ln-Tex2+, Ln = La, Gd, Lu). The lanthanide element is found to reside above the mean N5 texaphyrin plane, and the larger the cation, the greater the observed out-of-plan…
We show that the recently synthesized BF3-doped polyaniline (PANI) exhibits remarkable stability against thermal ageing. Unlike the protonated PANI, which shows rapid degradation of the conductivity on heating in air, BF3-doped PANI shows more than an order of magnitude improvement in conductivity. We employ x-ray pho…
The alkali halides have been studied very frequently for their simple structures and interesting properties, for example, the high-pressure induced transition$^1$. There are several successful models that can be employed. The most famous model of them is the Tosi-Fumi interionic potential$^2$ which is an empirical pot…
The palladium(0)−copper(I)-catalyzed polymerization of 1,4-diethynyl-2,5-bis(decyloxy)benzene ( I ), 1,4-bis(2-ethylhexyloxy)-2,5-diiodobenzene ( IIA ), 1-(6-(4-(hydroxymethyl)phenoxy)hexyloxy)-2,5-diiodo-4-methoxybenzene ( III ), and iodobenzene ( IV ) yielded a highly soluble, exclusively para-linked poly(phenylenee…
π-Conjugated poly(1,10-phenanthroline-3,8-diyl), PPhen, and its 5,6-dialkoxy derivatives, PPhen(5,6-OR)s, have been synthesized by using an organometallic polycondensation with a zerovalent nickel complex. They had average molecular weights of 4300−6800. PPhen had a stiff structure, as revealed by a light scattering m…
The definition of softness and local softness using the density of states (DOS) and local density of states (LDOS) given by Yang and Parr for metals has been casted into working equations and applied to sequences of finite cylindrical fullerenes modeling the (5,5) and (10,10) single-walled capped carbon nanotubes. The…
Computer simulations of perfectly branched dendrimers up to the sixth generation have been performed under the influence of uniaxial elongational flow for the first time for a model with explicit dendritic topology. The Brownian dynamics simulation technique has been applied to a freely jointed bead−rod model with exc…
Yb-doped YAG is becoming a very promising optical material. We present a synthesis of single-phase Yb-doped YAG powders and thin films at a significantly lower temperature by sol−gel methods than by other conventional techniques. Yb-doped YAG powders and thin films on Si(100) substrates with a series of different dopi…
The disassembly of dendritic structures was realized by a cascade cleavage reaction triggered by an initially stimulated group in the dendrimer periphery. A depolymerizable backbone was engineered into prototypical dendritic structures. Evidence for the completion of the disassembly process is provided by the absorban…
A topographically patterned substrate can be used to template a large, single crystalline grain of block copolymer spherical domains. Both the geometry of the substrate and the annealing temperature can be used to control the degree of order as well as the crystallographic orientation of the grain. The presence of a h…
We study numerically the energetics and atomic mechanisms of misfit dislocation nucleation and stress relaxation in a two-dimensional atomistic model of strained epitaxial layers on a substrate with lattice misfit. Relaxation processes from coherent to incoherent states for different transition paths are studied using…
Photo-physical and nonlinear-optical properties of a new amphiphilic conjugated polymer: hydroxylated pyridyl para-phenylene (Py-PhPPP) both in CH2Cl2 solution and in thin films have been investigated. By using Z-scan technique with nanosecond laser pulses of wavelengths ranging from 430 to 600 nm, the large nonlinear…
A wide emission band in the region of 425 nm is observed in all the examined crystals at photo and ionising irradiation. Maximum of the complex luminescence band is observed at 410 nm at 350 K and at 450 nm at 85 K. The shift of the peak of the band envelope towards shorter wavelengths as the temperature increases is…
Spatial uniformity of electron emission from velvet cathodes has been measured by observing the distribution of electrons hitting the anode in a planar high-voltage diode. It is shown that unless all electrons move parallel to the diode axis, the electron distribution measured at the anode does not represent the catho…
A study of the visible photoluminescence in single-crystal NiO and Ni<sub>c</sub>Mg<sub>1-c</sub>O (c = 0.99, 0.98 and 0.95) solid solutions is presented for the first time. Two wide luminescence bands, peaked at approximately 12000 cm<sup>-1</sup> and approximately 18500 cm<sup>-1</sup>, were observed. The dependence…