Materials Literature
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The absorption spectra of the AB- and AA-stacked nanographite ribbons have several prominent peaks. They strongly depend on the edge structure, the ribbon width, the stacking sequence, and the polarization direction. The armchair ribbons quite differ from the zigzag ribbons. The frequency and the number of the absorpt…
The optical properties of quasi-one-dimensional metallic ${\mathrm{LaTiO}}_{3.41}$ are studied for the polarization along the a and b axes. With decreasing temperature modes appear along both directions suggestive for a phase transition. The broadness of these modes along the conducting axis might be due to the coupli…
We report an experimental study on the temperature dependence, from 6 K up to 300 K, of the 4.4 eV emission excited at 7.6 eV via the conversion between two different types of oxygen deficient centers in silica. The photoluminescence undergoes a thermal quenching above 50 K, its amplitude decreasing by a factor of 10,…
We report measurements of time-of-flight charge carrier mobility and thermal optical polarized microscopy on a new class of hexagonal columnar $({\ensuremath{\Phi}}_{h})$ liquid crystals (LC) self-organized from supramolecular cylinders self-assembled from acene functionalized dendrons. We discuss the temperature and…
Aluminum-doped zinc oxide (AZO) films were deposited on glass substrates at 300°C by reactive mid-frequency (mf, 50 kHz) magnetron sputtering using dual magnetron cathodes with aluminum–zinc alloy targets. In order to keep the very high deposition rate stable in the transition region of the reactive sputtering system,…
Epitaxial ZnO films have been grown on Si (111) substrates by molecular beam epitaxy using ozone as an oxygen source. An initial deposition of a Zn layer followed by its oxidation produces a superior template for the subsequent ZnO growth. The reflection high-energy electron diffraction measurement suggests that the i…
The measurements of sound velocity and neutron scattering in the liquid state, and DSC and XAFS measurements in the amorphous state were carried out for Ge 15 Te 85 and Ge 15 Te 85- X M X (M = Ag, Cu and In) to investigate the correlation between the glass forming ability and local structure in the liquid and amorphou…
We have adapted the Callaway-Holland model so that the dispersive effect and correction term ${\ensuremath{\kappa}}_{c}$ can be included in the theoretical analysis of the lattice thermal conductivity of LiF over the temperature range 1--300 K, for varying concentration of the isotopic content ${}^{7}\mathrm{Li}.$ Som…
We have investigated the thermoelectric power of millimeter-long aligned multiwall carbon nanotubes down to a temperature of $T=1.5\mathrm{K},$ and observed an accurate $T\mathrm{ln}T$ dependence at low temperatures. This behavior is possibly originated from the repulsive interaction between the electrons in a disorde…
Organic−inorganic polymer hybrids were synthesized utilizing the host−guest interaction. Cyclodextrins (CDs, α-, β-, γ-CD) could be dispersed in the silica gel matrix at a nanometer level because of the hydrogen-bonding interaction between hydroxyl moieties of CD and residual silanol groups of silica gel. It is known…
We report electro-optic experiments in liquid crystalline freestanding films of achiral hockey stick shaped mesogens with a straight aromatic core. The material forms two smectic mesophases. In the higher temperature phase, a spontaneous polarization exists in the smectic layer plane and the films show polar switching…
Silver–silica nanocomposite thin films were prepared by high pressure d.c. sputtering technique. Films deposited at lower substrate temperature showed a narrow distribution of nanoparticles with nearly spherical shape. Increase in substrate temperature resulted in films with a non-uniform size and shape due to the agg…
Nitrogen radicals were irradiated on the (0001) and (0001) surfaces of the ZnO single crystals, and the stability and the states of N ions on the surfaces were investigated by Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS). On the (0001) surface, many N ions replaced the O ions of ZnO dur…
The novel, functionalized heteropolymolybdate [(O(2)CCH(2)PO(3))(2)Mo(5)O(15)](6-) (1) has been synthesized and characterized by IR and (31)P NMR spectroscopy and elemental analysis. Single-crystal X-ray analysis was carried out on Rb(4)KNa[(O(2)CCH(2)PO(3))(2)Mo(5)O(15)].H(2)O, which crystallizes in the monoclinic sy…
The spin-$\frac{1}{2}$ molecular system ${\mathrm{V}}_{15}$ shows no barrier against spin reversal. This makes possible direct phonon activation between the two levels. By tuning the field sweeping rate and the thermal coupling between the sample and the thermal reservoir we have control over the phonon-bottleneck phe…
Using a In 2 O 3 and ZnO powder mixture with a ratio of 95:5 in wt% as a target, highly transparent conducting oxide (TCO) films are prepared on polyethylene terephthalate (PET) substrates by rf-magnetron sputtering. These films have amorphous structures with excellent electrical stability, surface uniformity and adhe…
First-principle studies on the total energy, electronic structure, and bonding nature of $R\mathrm{NiIn}$ $(R=\mathrm{La},$ Ce, and Nd), and their saturated hydrides ${(R}_{3}{\mathrm{Ni}}_{3}{\mathrm{In}}_{3}{\mathrm{H}}_{4}=R{\mathrm{NiInH}}_{1.333})$ are performed using a full-potential linear muffin-tin orbital ap…
Single-wall carbon nanotubes (SWNTs) promise wide applications in many technical fields. As a result purified SWNT material is sold now on the West market at more than $1000 per 1 gram. Thus developing an effective technology for SWNTs production rises to a very important scientific problem. The perspectives of three…
Evidence is presented for the secondary nucleation of beta-L-glutamic acid on the surface of the alpha-polymorph, using a combination of Scanning Electron Microscopy and Raman spectroscopy.
Caesium salts of mono-ruthenium(III) substituted Keggin-type silicopolytungstate ([SiW11O39RuIII(H2O)]5− (1)) and its oxo-bridged dimeric species ([{SiW11O39RuIV/III}2O]11− (8)) were prepared and characterized by elemental analysis, infrared-spectroscopy, UV-Vis spectroscopy, and cyclic voltammetry for the first time.…