Materials Literature
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Abstract Four (BEDT‐TTF) 4 A[M(C 2 O 4 ) 3 ]·DMF (DMF = dimethylformamide) salts of the organic donor molecule bis(ethylenedithio)tetrathiafulvalene (BEDT‐TTF) with metal oxalate anions, where A = (NH 4 , K), M = Cr ( 1 ); A = NH 4 , M = Fe ( 2 ); A = K, M = Cr ( 3 ); and A = NH 4 , M = Cr ( 3′ ) were prepared by elec…
As a direct metal patterning method, local electrodeposition of Ni onto porous silicon (PS) is studied. The principle of the method in this research utilizes the photo-excitation of semiconductor, in contrast to the previous studies of laser assisted metal deposition, in which the deposition is enhanced by heating eff…
We have investigated hybrid organic-inorganic systems composed of silicon–porous silicon and poly(phenylene vinylene) (PPV) in order to fabricate new light emitting devices, having properties of both materials. The key concern in these systems is the control of the penetration of the polymer into the pores of the semi…
The deposition of nickel (Ni) onto a porous silicon (PS) layer by immersion plating from acidic and alkaline fluoride solutions has been studied. In an immersion plating bath of simple hydrofluoric acid (HF) of pH 2 containing Ni ions, no metal deposition was observed. However, visible metallic Ni was deposited from t…
Porous silicon can be used as separation layers in layer transfer technology where a thin layer of crystalline silicon is separated from a large wafer and transferred onto a cheap foreign substrate. The porous layers are part of the fabrication process and undergo the processing treatment, especially the thermal treat…
We report the temperature dependent cross-plane thermal conductivities of Ge quantum dot superlattices measured by the 3\ensuremath{\omega} method. A large reduction in the thermal conductivity of the superlattices compared with that of bulk materials is observed. A simple model taking into account the relaxation time…
In this paper we study the dynamics of pore coarsening in porous silicon during annealing. We model the sintering of pores with two-dimensional and three-dimensional simulations. We compare our simulations with transmission and scanning electron micrographs of experimentally annealed porous silicon samples. Simulation…
The aim of this work is to explain the influence of the solvent molecules on silicon dissolution using several hydrofluoric acid containing “organic” electrolytes. The investigations focus on the morphology of the mesopores and macropores and the electrochemical valence of the overall reaction. Some basic properties o…
Data published during the last 15 years on the intercalation of metal and n-alkylammonium ions, organic molecules and organometallic complexes in vanadium(V) oxide xerogel are generalised and described systematically. The possible mechanisms of intercalation processes are considered. The possibility of using hybrid ma…
The effect of O/Zn flux ratio on the crystalline quality of ZnO films grown at 700°C by plasma-assisted molecular beam epitaxy was investigated. Zinc beam flux ( F Zn ) was varied from 2.2≤ F Zn ≤8.3 Å/s with an O 2 flow rate of 3 sccm and RF power of 300 W. The surface morphology of the ZnO layers strongly depended o…
Abstract Starting with Co‐salt‐loaded inverse micelles, which form if the diblock copolymer polystyrene‐ block ‐poly(2‐vinylpyridine) is dissolved in a selective solvent like toluene and CoCl 2 is added to the solution, monomicellar arrays of such micelles exhibiting a significant hexagonal order can be prepared on to…
This paper presents an extensive and systematic analysis of the oxygenation of semiconducting and metallic single-wall carbon nanotubes by using the first principles pseudopotential plane wave method. Our study involves the physisorption of oxygen molecules, chemisorption of oxygen atoms and formation of an oxide, and…
Collagen is an integral part of many types of connective tissue in animals, especially skin, bones, cartilage, and basement membranes. A fibrous protein, collagen has a triple-helical structure, which is comprised of strands with a repeating Xaa-Yaa-Gly sequence. l-Proline (Pro) and 4(R)-hydroxy-l-proline (4-Hyp) resi…
Abstract Four series of dyes with dimethylamino electron donor groups and N ‐R‐pyridinium (R = methyl Me, phenyl Ph, 2,4‐dinitrophenyl 2,4‐DNPh, or 2‐pyrimidyl 2‐Pym) electron acceptors are studied as their hexafluorophosphate salts. The intramolecular charge‐transfer (ICT) energies ( E max ) of these compounds decrea…
An effective spin relaxation mechanism that leads to electron spin decoherence in a quantum dot is proposed. In contrast to the common calculations of spin-flip transitions between the Kramers doublets, we take into account a process of phonon-mediated fluctuation in the electron spin precession and subsequent spin ph…
Epitaxial titanium diboride thin films have been deposited on sapphire substrates by Pulsed Laser Ablation technique. Structural properties of the films have been studied during the growth by Reflection High Energy Electron Diffraction (RHEED) and ex-situ by means of X-ray diffraction techniques; both kinds of measure…
Using the tight-binding linear muffin-tin orbitals method, the soft x-ray fluorescence K-emission spectra of boron in MgB_2, excited close to the absorption edge, are estimated. In the calculations the angle of incidence between the direction of the incoming photon and the hexagonal axis of the specimen is 60 degrees…
We use the density-functional calculations to investigate the compositional dependence of the lattice constant of (Ga,Mn)As containing various native defects. The lattice constant of perfect mixed crystals does not depend much on the concentration of Mn. The lattice parameter increases if some Mn atoms occupy intersti…
In order to assess the magnetic ordering process in Fe2VAl and the related material Fe2VGa, we have carried out nuclear magnetic resonance (NMR) and Mossbauer studies. 27Al NMR relaxation measurements covered the temperature range 4 -- 500 K in Fe(2+x)V(1-x)Al samples. We found a peak in the NMR spin-lattice relaxatio…
We report first-principles density-functional pseudopotential calculations on the atomic structures, electronic properties, and band offsets of ${\mathrm{B}\mathrm{a}\mathrm{O}/\mathrm{B}\mathrm{a}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$ and ${\mathrm{S}\mathrm{r}\mathrm{O}/\mathrm{S}\mathrm{r}\mathrm{T}\mathrm{i}\mathrm{…