IR reflectance spectroscopy at 50–450 cm –1 was used to study homogeneous monocrystals of (FeIn 2 S 3 ) x ∙(In 2 S 3 ) 1– x grown by the method of direction melt crystallization (vertical Bridgman method). The frequencies of the transverse (ω TO ) and longitudinal optical phonons (ω LO ) as well as their damping coefficients were determined. Concentration dependence curves were constructed for these parameters and their behavior was established.

Large-block crystals of FeIn2S4 and MnIn2S4 ternary compounds and MnxFe1–xIn2S4 solid solutions are grown by directional crystallization (horizontal Bridgman method). The structures of the obtained crystals are determined by x-ray diffraction analysis. Both the starting compounds and the solid solutions based on them are shown to crystallize in the cubic spinel structure. IR reflection spectra in the range 50–500 cm–1 of crystals of FeIn2S4 and MnIn2S4 ternary compounds and FexMn1–xIn2S4 solid solutions are studied. The frequencies of transverse (ωTO) and longitudinal (ωLO) optical phonons are determined. The concentration dependences of these parameters are plotted. The nature of their behavior is established.

Large-block crystals of FeIn 2 S 4 and MnIn 2 S 4 ternary compounds and MnxFe 1– x In 2 S 4 solid solutions are grown by directional crystallization (horizontal Bridgman method). The structures of the obtained crystals are determined by x-ray diffraction analysis. Both the starting compounds and the solid solutions based on them are shown to crystallize in the cubic spinel structure. IR reflection spectra in the range 50–500 cm –1 of crystals of FeIn 2 S 4 and MnIn 2 S 4 ternary compounds and Fe x Mn 1– x In 2 S 4 solid solutions are studied. The frequencies of transverse (ω TO ) and longitudinal (ω LO ) optical phonons are determined. The concentration dependences of these parameters are plotted. The nature of their behavior is established.

On homogeneous monocrystals of solid solutions (FeIn2S4)х·(In2S3)1–х, grown by the method of directional melt crystallization (vertical Bridgman method), IR reflection spectra in the frequency range of 50—450 cm–1 were studied. The frequencies of transverse (ωTO) and longitudinal (ωLO) optical phonons, as well as their damping coefficients, were determined. The concentration dependences of the mentioned parameters were constructed and the nature of their behavior was established.

By the method of high-frequency repetitively pulsed f ~ 10-15 kHz laser action with a wavelength l = 1.064 fim and a power density q = 150 MW/cm 2 on zinc oxide ceramics doped with manganese oxide at a pressure in the vacuum chamber p = 2.7 Pa there were obtained nanostructured thin films on a silicon substrate. The surface morphology and the elemental composition of the obtained films were studied using atomic force microscopy; scanning electron microscopy, and X-ray spectral microanalysis. The features of the transmission spectra in visible, near and middle IR regions are revealed. The analysis of the electrophysical properties of the ZnO+2% MnO 2 /Si heterostructure was carried out.

Nanostructured thin films on a silicon substrate were obtained on a ceramic of zinc oxide doped with manganese oxide by high-frequency periodic pulsed laser action with f ~ 10–15 kHz, wavelength λ = 1.064 μm at power density q = 150 MW/cm2 in a vacuum chamber with p = 2.7 Pa. The surface morphology and the elemental composition of the obtained films were studied using atomic force microscopy, scanning electron microscopy, and X-ray spectral microanalysis. Features of the transmission spectra in the visible, near, and middle IR regions were determined. The electrophysical properties of the ZnO + 2% MnO2/Si heterostructure were analyzed.

ZnO thin films of zinc oxide doped with 10 % ITO (indium tin oxide) on anodic aluminum oxide substrates are formed in vacuum during high-frequency repetitively pulsed laser deposition. The morphology of films on porous and non-porous surfaces of substrates was studied by atomic force microscopy. The optical properties of the films in the visible, near, and middle IR regions of the electromagnetic radiation spectrum, the Raman spectra, and also the features of the photoluminescence characteristics have been experimentally investigated. Zinc oxide films can be used in optoelectronic transducers, as luminescent material, in the form of transparent electrodes, sensitive layers of gas and biological sensors, catalysts, X-ray and gamma-radiation detectors.

ZnO thin films of zinc oxide doped with 10 % ITO (indium tin oxide) on anodic aluminum oxide substrates are formed in vacuum during high-frequency repetitively pulsed laser deposition. The morphology of films on porous and non-porous surfaces of substrates was studied by atomic force microscopy. The optical properties of the films in the visible, near, and middle IR regions of the electromagnetic radiation spectrum, the Raman spectra, and also the features of the photoluminescence characteristics have been experimentally investigated. Zinc oxide films can be used in optoelectronic transducers, as luminescent material, in the form of transparent electrodes, sensitive layers of gas and biological sensors, catalysts, X-ray and gamma-radiation detectors.

The spectral and polarization characteristics of optically anisotropic polyvinyl alcohol (PVA) films containing 4,4'-bis[4-(phenylamino)-6-(methoxy-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid as dichroic dye, which has intense blue fluorescence, were investigated by polarized luminescence and absorptionspectroscopy in the IR and UV regions. With fourfold uniaxial stretching of the film the orientation parameter of the dye amounts to 0.82–0.86, the maximum polarizing ability of the film is 96% (at the maximum of the absorption band at 375 nm), and the degree of polarization and quantum yield of fluorescence at the optimum concentration of the dye amount to 0.90 and 0.91. The degree of orientation of the dye molecules depends weakly on the concentration (0.01–0.50 wt.%) and increases with increase of the uniaxial stretching of the film. The insertion of the dye molecules between the PVA chains leads to a reduction of the crystallinity of the polymeric matrix.

Galvanostatic formation of nanoporous anodic films on aluminum was performed in 0.6mol·dm−3 malonic acid electrolyte over a wide current density range in order to define the relationship between the anodizing behavior, oxide growth, dissolution and volume expansion of the oxide. The volume expansion and aluminum dissolution increase with raising the current density, the latter indicating an increasing potential difference across the electrolyte/barrier-layer interface. The same potential difference promotes dissociation of the acid molecules and incorporation of electrolyte-derived species into the film. The increase of volume expansion occurs in three phases, resulting from the two dissociation steps of malonic acid and from the change in the oxide growth mechanism at higher current densities. Infrared spectroscopy showed an enhanced presence of OH in films formed at higher current densities, indicating that lower coordination of aluminum as well as anion incorporation contributes to volume expansion of the oxide. The current appeared to be 100% ionic in the interval of 5–100mA·cm−2, while being about 10% electronic beyond this range. At higher current densities a self-localizing mechanism concentrates the ionic current to a smaller, spot-like area that moves continuously along the sample consuming steadily the whole metal thickness under the spot and thus forming a porous anodic film of highly self-ordered morphology, without physical imperfections. The volume expansion factor of the oxide becomes independent of the anodization current density under these conditions.

Effect of the structural defectiveness of carbon nanotubes on the influence exerted on these nanotubes by their liquid-phase treatments with oxidizing agents (hydrogen peroxide, concentrated nitric acid, and its mixture with sulfuric acid) was studied. It was found that this factor affects changes in the structure of oxidized carbon nanotubes, their hydrophilicity, high-quality arrays of these tubes, and their ability to form stable dispersions in water, ethanol, isopropanol, and acetone.

Infrared absorption spectroscopy is used to determine the molar fractions of absorbing components among ethanol conversion products in nonequilibrium atmospheric-pressure glow discharges. It is shown that, when the conservation of the number of atoms at the inlet and outlet of the plasma chemical reactor is taken into account, this also makes it possible to determine the molar fractions of the IR inactive molecules H-2, N-2, and O-2. The concentration of hydrogen in the conversion products was also monitored using a device based on the passage of hydrogen through a palladium membrane.

The effect of chemical methods that include the gas-phase and liquid-phase selective oxidation methods, of hydrochloric acid when used in different sequences, and of concentrated nitric acid on the purification efficiency of carbon nanotubes after their synthesis is studied. Changes in the quality of walls of this material at different stages of purification are studied physicochemically.

The IR properties, mesoporous and crystalline structures, and phase composition of anodic alumina films formed in aqueous solutions of malonic acid with the additives of arsenazo I and without have been studied.

The tautomerism and spectral properties of 3-[3-(4-methoxycarbonylphenyl-acryloyl]tetrahydrofuran-2,4-dione (MCPATD) have been investigated by the methods of nonempirical and semiempirical quantum chemistry (nonempirical calculations by the Möller–Plesset theory of 2nd-order perturbations, calculations by the AM1 and PM3 semiempirical methods), as well as by IR and 1H NMR spectroscopy. It has been shown that the presence of an additional chain of conjugation in the side chain of MCPATD substantially changes its tautomeric composition and spectral properties as compared to 3-formyl- and 3-acetyltetrahydrofuran-2,4-diones. The frequencies and forms of normal vibrations calculated for each cis-enolic tautomer differ substantially within the region of vibrations of keto groups and double bonds, which makes it possible to identify the tautomers present in the mixture. It is found that in CHCl3 solutions MCPATD exists as an equilibrium mixture of its exoenolic forms. The possible mechanisms underlying the enol-enolic conversions of MCPATD are discussed.

The phase equilibriums in the AgInS2–CuInS2 system were investigated by means of X-ray diffraction and differential thermal analysis and the AgInS2 and CuInS2 ternary compounds and the AgxCu1−xInS2 solid solutions were grown by two-zone horizontal method with the following directed crystallization of melt. The T–x phase diagram of this system was constructed and the formation of solid solutions in the complete range of compositions was discovered. The composition dependencies of microhardness, transmission spectra in the range of the fundamental absorption, infrared transmission spectra in the range from 150 to 400 cm-1 for the AgxCu1−xInS2 solid solutions were investigated. It was discovered that the composition dependence of microhardness is expressed by smooth curve having maximum for x=0.2. The composition dependencies of band gap have been analytically expressed at 77 and 293 K for the E⊥c and E∥c direction of polarization and have non-linear behaviour. From the studies of the infrared transmission spectra the frequencies of optical phonons were determined and it was discovered that their composition dependence shows single mode behaviour.