V. V. Naumov

National Academy of Sciences of Ukraine | ISP · Institute of Semiconductor Physics - Department of Theoretical Physics

This paper presents the results of the theoretical study of the process of low-temperature plasma-assisted reforming of ethanol into molecular hydrogen in the electric discharge in a gas channel with liquid wall (DGCLW) in the regime where the discharge is ignited by the breakdown with the air injection between tubular electrodes and then it burns...

Novel ideas for doing more efficient combustion with using of electronically excited singlet oxygen are proposed. Available methods of singlet oxygen generation: chemical, photochemical and plasma-chemical by using electrical discharges are evaluated. Kinetics and mechanisms of intensification of combustion in H2-O2 mixture with singlet oxygen due...

The kinetics of the superluminescence of lead atoms, Pb 3P 10 → 1D2 (722.9 nm) and 3P10 → 3P2 (405.8 nm), at the fast adiabatic expansion and cooling of the detonation products of lead azide Pb(N3)2 in vacuum has been studied. The effects of the condensation and scattering of light from drop clusters in an optically active heterophase medium has be...

The optical absorption and photoluminescence of anatase and rutile TiO2 were studied at room temperature. TiO2 nanocrystalline powders were synthesized in the form of pure anatase or rutile. The samples were characterized by X-ray diffraction, X-ray fluorescence, Raman spectroscopy, optical absorption and photoluminescence (PL) methods. The PL spec...

To look forward to new trends in modern gas lasers and their applations, the current theoretical and experimental studies (state-of-art) on search of new active media for high-power short-wavelength gasdynamic and chemical lasers are reviewed. The basic physical aspects (optical, kinetical, thermal and fluid dynamical) in operation of gas flow las...

A comparative analysis of the features of UV-stimulated emission (SE) of various disordered active materials based on ZnO crystallites for a random laser (RL) was carried out. The superlinear increase in the intensity of the UV photoluminescence (PL) band of polydisperse nano-micro-crystalline (PNMC) ZnO powder at a wavelength of λ = 387 nm and som...

A comparative analysis of the features of UV- stimulated emission (SE) of various types of disorder active materials based on ZnO crystallites for a random laser (RL) was carried out. The superlinear increase in the intensity of the UV photoluminescence (PL) band of polydisperse nano- microcrystalline (PNMC) ZnO powder at a wavelength of λ = 387 nm...

The effect of surface Fe-doping on the structural, photocatalytic, optical properties of polydisperse anatase and rutile TiO2 has been comprehensively studied. The TiO2 surface has been modified by Fe³⁺ ions through the adsorption from the diluted FeCl3 aqueous solutions. The prepared powders were characterized using X-ray diffraction (XRD), field-...

Extreme UV plasma sources including UV excimer lasers and excilamps are of great interest for modern science and technology, for instance, in nanolithography [1,2]. But despite the advances in excimer plasma physics, non-equilibrium kinetics of excimer plasma is still not entirely clear, in particular, regarding metastable excited species (MES). We...

Non-equilibrium plasma in high-voltage gas discharges of the so-called apokamp type (blue jets, red sprites) is of great interest for science and practice [1]. But, despite the advances in apokamp plasma physics, the mechanism of apokamp plasma chemistry is not very clear, in particular, concerning electronically excited reactive oxygen and nitroge...

Kinetics of non-equilibrium plasma in dielectric barrier discharges (DBD) is of great interest for science and practice [1]. But despite the advances in plasma physics, the mechanisms of plasma-chemical processes are not very clear, in particular, concerning electronically excited states (EES) of oxygen and nitrogen atoms and molecules. We tried to...

At present, there is a great interest in hybrid metal-oxide composites activated with organic dyes to produce multifunctional materials with improved properties for different environmental and energy applications. We studied powder titanium dioxide (TiO2) composites with organic phenothiazine (PTZ, C12H9NS). High-purity single-phase anatase and rut...

Composite organic-inorganic hybrids are considered as a good alternative for light-weight thin-film photovoltaic (PV) cells [1]. Our approach is based on the next innovations: i) low-cost bio- or synthetic organic molecules suitable for broad band sunlight harvesting; ii) room-temperature process of self-organization and self assembly of 2D nanostr...

Raman and photoluminescence spectroscopy are used to study the effect of organic phenothiazine (PTZ) dye on the structural and optical properties of the nanocrystalline titanium dioxide anatase (A/TiO2). It is found that PTZ-doping leads to an intense dark blue coloration of the initially white TiO2 powder. The FT-Raman spectra of the obtained samp...

We studied the photoluminescence (PL) of titanium-manganese mixed oxides TiO2/MnOx (TMO) obtained by chemical precipitation of manganese hydroxide on particles of rutile followed by annealing at different temperatures. It is found that the PL spectra, which were observed in the range 2.4 ÷ 3.4 eV, depend essentially on the phase composition of TMO....

Organic-inorganic hybrids are one type of the variety of composite materials. We propose the self-organization (SO) and self-assembly (SA) approach for formation of such hybrids. SO and SA layers are potential objects for photovoltaics, optoelectronics, biosensing, as well as gene and drug delivery applications due to: (i) unique properties of both...

Titanium-manganese mixed oxides TiO2/MnOx (TMO) were prepared by chemical precipitation of manganese hydroxide on pure nanocrystalline rutile TiO2 particles with subsequent thermal treatment at different temperatures. The morphology, structural and optical properties of TMO samples were investigated using standard XRD, SEM, EDS, XRF, TGA, FT-Raman...

Today organic-inorganic hybrid (OIH) semiconductor materials are a creative alternative for applications in electronics and photonics, particularly, for photovoltaic (PV) solar cells [1]. The approach is based on the next innovative solutions: (1) use of low-cost bio- or synthetic organic compounds for creating OIH suitable for broad-band sunlight...

Plasma enhanced oxidizing and nitriding processes are of great interest for physics and applications. However, despite all advances in plasma technology, mechanisms of non-equilibrium plasma chemistry are not quite clear, particularly concerning reactive oxygen and nitrogen species (ROS/RNS) in metastable states. We tried to study this matter more...

Titanium-manganese mixed oxides, TiO2/MnOx (TMO) are one of the most remarkable functional materials in a family of metal-oxide semiconductors, which have enhanced photoactivity in response to light and capabilities of various energy and environmental applications including photovoltaics, photocatalysis and photosensors. We studied nanostructured T...

In a nonequlibrium plasma of a gas-discharge HgBr lamp, the terminal electronic state of the HgBr(B–X) radiative transition with a peak wavelength of 502 nm remains populated for a relatively long time and is repeatedly excited to the upper state in collisions with plasma electrons. This transfer of the HgBr molecules from the ground state X to the...

We have studied the photoluminescence (PL) of titanium dioxide nanocrystalline powders (TiO2) synthesized by the thermal hydrolysis in the form of anatase (A), whose surface has been modified by the adsorption of chromium ions (Cr3+). The samples are characterized by X-ray diffraction, X-ray fluorescence, and Raman spectroscopy. PL spectra were exc...

We have studied the photoluminescence (PL) of nanocrystalline titanium dioxide (TiO2), synthesized by the thermal hydrolysis in the form of anatase (A) or rutile (R), the surface of which has been modified by adsorption of chromium ions (Cr3+). The samples were characterized by X-ray diffraction, X-ray fluorescence, Raman spectroscopy and optical a...

The effects of electronically excited reactive oxygen (ROS) and nitrogen (RNS) species in metastable states O2*(a,b), N2*(A) and other small but important radicals in the kinetics of non-equilibrium plasma-enhanced oxidation and nitriding are studied and analyzed in experiments and numerical simulations.

Nanocrystalline anatase (A) and rutile (R) TiO2 were synthesized by the thermal hydrolysis and then were surface doped with Cr ions by adsorption. The samples were characterized by X-ray diffraction, X-ray fluorescence, Raman spectroscopy, optical absorption and photoluminescence (PL) methods. It is found that the PL emission and optical absorption...

Nanostructured titanium dioxide (TiO2) is one of the most promising materials in the family of metal oxides semiconductors that characterized by unique properties and capabilities for various energy and environmental applications, particularly, in extreme terrestrial or extraterrestrial environments. To expand TiO2 photocatalytic activity from the...

Possible approaches to biosensing and diagnosis of UV stress-induced reactions in plants using reactive oxygen species (ROS) in the cell organelles: mitochondria, peroxisomes and chloroplasts as biomarkers to study the plant cells ability to adapt and defend from supraphysiological levels of solar radiation in extreme environments to understand the...

A possible approach to high-speed jet propulsion using the pulses of laser plasma (LP) following pulsed laser ablation (PLA) and stimulated low-energy nuclear reactions (LENR) of transmutation of chemical elements in the fuel material (FM) of suitable composition is discussed and analyzed in terms of the use for long-range interplanetary space flig...

A kinetic model of the working medium of a gas-discharge excilamp on the B–X transition of mercury bromide, HgBr, excimer molecules has been proposed. The model explains the non-monotonic dependence of the excilamp radiation intensity on the partial pressure of mercury dibromide, HgBr2, molecules by the attachment of electrons to these molecules. H...

The differential approach to processing of experimental data on the basis of the dimensionless sensitivity analysis is proposed in order to evaluate the solar radiation amplification factor (RAF) as a result of climatic changes of the total ozone content (TOC) in the Earth’s atmosphere, which due to biologically active UV irradiance, or exposure (U...

Key kinetic processes that occur in reactive heterophase plasma during fast adiabatic expansion and cooling of the lead azide detonation products in a supersonic flow including nonequilibrium radiation, vapor condensation, atomic clastering, and light scattering have been studied and analyzed in order to interpret the experiments in the lead-azide...

Propane is considered as a prospective alternative fuel due to potential low HC and CO emissions compared with heavier hydrocarbon fuels like kerosene. In view of it, there are several issues to clarify. First, how the addition of H2 to propane air mixture influences NOx and other N-containing species emissions. Second, how it affects the self-igni...

Titanium dioxide (TiO2) nanocrystalline powders were prepared by the thermal hydrolysis method in the form of pure anatase or rutile and were investigated by X-ray diffraction, X-ray fluorescence, FT-Raman spectroscopy, optical absorption, and photoluminescence (PL) methods. PL spectra were studied under the intense UV laser excitation at 337.1 nm...

The optical absorption and photoluminescence of nanocrystalline TiO2 samples of anatase and rutile were investigated at room temperature. Nanocrystalline TiO2 samples were synthesized in the form of pure anatase or rutile and studied by X-ray diffraction, X-ray fluorescence, Raman spectroscopy, optical absorption and photoluminescence (PL). PL was...

The effects of lasing in two-phase gas-dispersed media containing fine metal droplets under conditions of photon-stimulated chain-branched reactions of oxidation are kinetically modeled and analyzed.

Recent advances in laser technology of metallic nanoparticles (NP) fabrication based on the self-organization processes induced by pulsed laser ablation (PLA) of target metals (Au, Ag, Cu, Fe) at conditions of the local surface plasmon resonance (SPR) in various gas and liquid environments are presented

To look forward to new trends in modern gas lasers and their applations, the current theoretical and experimental studies (state-of-art) on search of new active media for high-power short-wavelength gasdynamic and chemical lasers are reviewed. The basic physical aspects (optical, kinetical, thermal and fluid dynamical) in operation of gas flow las...

We have investigated the effect of doping of nanocrystalline TiO2 with transition metal cations (Cu2+, Fe3+, Co2+, Cr3+) on the properties related to optical absorption. The metal-doped TiO2 samples have been characterized using an X-ray diffractometry, X-ray fluorescence analysis, a scanning electron microscopy, and a UV–visible absorption spectro...

The effect of nanocrystalline TiO2 doping with transition metal cations (Cu2+, Fe3+, Co2+, Cr3+) on their optical absorption and photocatalytic properties was investigated. The obtained metal-doped TiO2 samples were characterized by X-ray diffraction, scanning electron microscopy, and UV-vis absorption spectroscopy. It is shown that doping effect o...

Results of modification of optical and photocatalytic properties of polydisperse nanostructured anatase and rutile TiO2 doped by ions of transition metals of iron-group (Fe, Cu, Co and Cr) are analyzed and discussed.

The effects of lasing in two-phase dispersed lead azide plasma detonation products following by cluster condensation and light scattering are kinetically modeled and analyzed.

Kinetics of nonequilibrium emission radiation following the detonation of lead azide and light scattering at the condensation of the products in supersonic expanding flows are explored for interpretation of experiments in active media of detonation plasmodynamic lasers.

The results present analysis of kinetics and mechanism of the fuel reforming through partial oxidation by different plasma-chemical methods including excitation of O2 molecules to the singlet delta O2(a1Δg) and singlet sigma O2(b1Σg+) states, and dissociation of O2 molecules into O atoms by electron impact in discharge with different values of redu...

Nanocrystalline titanium-manganese mixed oxides (TMMO) with Mn content of 13–16 at% were first synthesized by manganese hydroxide precipitation on anatase or rutile particles. UV-vis absorption spectra were investigated in 2.4–6.0 eV region and revealed that compared with pure TiO2 the presence of TMMO results in an increase of the absorption inten...

The paper presents the results of the modeling study of the process of low-temperature plasma-assisted reforming of liquid ethanol into hydrogen-rich syngas in the dynamic plasma-liquid reactors with electrical discharges of different types, focusing on kinetic effects of the plasma-chemical fuel conversion and hydrogen production for enhanced comb...

The paper presents the modeling study of the process of low-temperature plasma-assisted reforming of methane in the CH4-O2 mixture through partial oxidation by plasma-chemical methods including excitation of O2 molecules to the singlet delta O2(a1Δg) and singlet sigma O2(b1Σg+) states, and dissociation of O2 molecules into O atoms by electron impac...

We have studied the optical and photocatalytic properties of titanium-manganese mixed oxides. The absorption spectra in the UV-vis range for pure TiO2 (rutile and anatase) and Ti-Mn oxides were measured in 2.5–6.0 eV range. In the range of 2.5–3.0 eV there is a "tail" of absorption of TiO2, caused by optical transitions between the states, located...

The results presented demonstrate progress in creation of the powerful electric gas-discharge plasma generator of pulse-periodic action, capable to produce singlet oxygen O2(a1Δg) and O2(b1Σg+) molecules in the flow of sub-atmospheric pressure that allows to use it for the intensification of combustion in power plants and jet engines.

The work aims to complex experimental and theoretical modeling of electron transport in lateral and vertical nitride quantum heterostructures with high mobility of electrons in two-dimensional electron gas in the conducting channel at the heterojunction in conditions of strong spontaneous and piezoelectric polarization and interaction of internal a...

Results of comparative spectroscopic studies of UV-vis optical absorption for nanostructured anatase and rutile TiO2, both pure and doped with cations of different transition metals Fe, Cu, Co, and Cr, are analyzed and discussed.

Changes of the band gap and photocatalytic activity of nanostructured anatase and rutile TiO2 modified with ions of different transition metals Fe, Cu, Co and Cr are analyzed and discussed.

Effects of impurities of different transition metals Fe, Cu, Co and Cr on the band gap and photocatalytic properties of nanostructured anatase and rutile TiO2 are analyzed and discussed.

Spectral characteristics of UV optical absorption of nanostructured titanium dioxide TiO2 doped with cations of different transition metals Fe, Cu, Co and Cr are analyzed and discussed.

In this paper results of optical emission spectroscopic (OES) study of atmospheric pressure microwave 915 MHz argon plasma are presented. The plasma was generated in microwave plasma source (MPS) cavity- resonant type. The aim of research was determination of electron excitation temperature T-exc gas temperature T-g and electron number density n(e)...

The paper presents experimental and theoretical studies of non-thermal plasma assisted reforming of liquid ethanol into hydrogen-rich syngas in dynamic plasma-liquid systems (PLS) using electric DC and pulsed discharges in a gas channel with liquid wall (DGCLW) and DC discharge in a reverse vortex gas flow of Tornado type with “liquid” electrode (T...

The influence of Cu, Fe, Co, and Cr transition metal ion impurities on the optical absorption spectra of polydisperse powders of nanocrystalline TiO2 rutile and anatase synthesized in identical experimental conditions is studied. For all rutile samples, no spectral shift of the absorption edge is observed, while a significant red shift of the absor...

The paper presents the results of numerical modeling of non-thermal plasma-assisted reforming of liquid ethanol into hydrogen-rich syngas in the dynamic plasma-liquid reactors with electrical discharges of different types, focusing on kinetic effects of the low-temperature fuel conversion and hydrogen production for enhanced combustion in jet propu...

Nanocrystalline titanium–manganese mixed oxides (TMMO) with Mn content of 13–16 at.% were first synthesized by manganese hydroxide precipitation on anatase or rutile particles. The structure, morphology and chemical composition of the samples were characterized using XRD, SEM, EDS and XRF methods showing that the synthesized mixed oxides are polydi...

Results of investigations of plasma-liquid systems based on transversal discharges at atmospheric pressure such as transverse arc, secondary discharge supported by plasma of transverse arc, DC and Pulse discharges in a gas channel with liquid wall working in quiet and microporous bubbling liquids, discharge in a reverse vortex gas flow of tornado t...

This paper presents the results of experimental and theoretical investigations of the process of non-thermal plasma-assisted reforming of aqueous ethanol solutions in the dynamic plasma-liquid systems using the DC electric discharges in a gas channel with liquid wall and the additional excitation of ultrasonic field in liquid. The experiments show...

Characteristics of optical absorption of polydisperse titanium dioxide nanoparticles doped with manganese are analyzed and discussed.

In this paper we report new results of our experimental and theoretical studies of the process of plasma-assisted reforming of ethanol in the PLS with the DC and pulsed DGCLW and TORNADO-LE using available methods of diagnostics and numerical modeling.

The paper presents the results of experimental and theoretical investigations of the process of non-thermal plasma-assisted reforming of aqueous ethanol solutions in the dynamic plasma liquid systems using the DC electric discharges in a gas channel with liquid wall and the additional excitation of ultrasonic field in liquid. Excitation temperature...

This paper presents the results of complex experimental and theoretical studies of the process of nonthermal plasma-assisted reforming of ethanol-based fuels in the dynamic plasma liquid systems using the DC and pulsed electric discharges in a gas channel with liquid wall (DGCLW) and the DC discharge in a reverse vortex gas flow of Tornado type wit...

Mixed titanium-manganese oxides (TMO) with the Mn content of 13-16%at. were first synthesized by manganese hydroxide precipitation on anatase or rutile particles. The structure, morphology and chemical composition of the samples were characterized using XRD and XRF methods showing that the synthesized mixed oxides are the polydisperse nanocrystalli...

The paper presents the results of experimental and theoretical investigations of the process of non-thermal plasma-assisted reforming of aqueous ethanol solutions in dynamic plasma-liquid systems using the DC and pulsed electric discharges in a gas channel with liquid wall (DGCLW) and the DC discharge in a reverse vortex gas flow of tornado type wi...

It is investigated the opportunity to obtain hydrogen in a plasma-chemical reactor using for conversion a mixture of air/ethanol/water vapors. It is shown that H2 concentration increases as a linear function of the discharge current, and it decreases when the rate of air flow through the discharge increases. It is obtained that output H2 reaches hi...

Peculiarities of kinetics of radiative and collisional relaxation of excimer molecules in excimer plasma of high density is analyzed for better understanding of physics of processes and interpretation of experimental data in active media of excimer lasers and exilamps.

The work aims to theoretical modeling of electron transport in nanoscale nitride quantum heterostructures with high electron mobility of two-dimensional electron gas in the conducting channel at the interface in conditions of strong spontaneous and piezoelectric polarization.

Structural properties, phonon Raman spectra and optical absorption properties of nanocrystalline mixed TiO2 and MnO oxides are studied and discussed.

Kinetics and mechanisms of initiation of combustion in supersonic H2(CH4)-O2 reactive flows behind an inclined shock wave front are analyzed numerically when chemically active species are produced in plasma by electric discharges with different values of reduced electric field E/N. The analysis is carried out based on thermally nonequilibrium kinet...

The work aims to transport characteristics of two-dimensional electron gas in the conducting channel of nitride quantum heterostructures with different configuration of nanolayers and different degree of localization of electrons in quantum wells at the interface.

Results of investigations of plasma-liquid systems based on transversal discharges at atmospheric pressure such as transverse arc, secondary discharge supported by plasma of transverse arc, discharge in a gas channel with liquid wall working in quiet and microporous bubbling liquids, applied for different ecological applications including reforming...

This paper presents the results of experimental and theoretical investigations of the process of non-thermal plasma-assisted reforming of aqueous ethanol solutions in the dynamic plasma liquid system based on the electric discharges in a gas channel with liquid wall. The experiments show possibilities and efficiency of low-temperature plasma-chemic...

In search for an alternative fuel for internal combustion engines, we have studied the possibility of obtaining molecular hydrogen via the conversion of air mixture with ethanol and water vapors in a new plasma reactor. It is shown that, in agreement with experimental data, the H2 concentration is a linear function of the discharge current and decr...

hchedrin, Results of investigations of plasma-liquid systems based on transversal discharges at atmospheric pressure such as transverse arc, secondary discharge supported by plasma of transverse arc, discharge in a gas channel with liquid wall working in quiet and microporous bubbling liquids applied for different ecological applications including...

Experimental and theoretical research of the process of low-temperature transformation of ethanol-water mixture in non-equilibrium plasma of the electric discharge in a gas channel with liquid wall was carried out. The gas channel in liquids was created by two counterblow air streams in the liquid and liquid vapors. The stable gas-phase conversion...

This paper presents the results of experimental and theoretical investigations of the process of nonthermal plasma-assisted reforming of aqueous ethanol solutions in the dynamic plasma-liquid system based on the electric discharge in a gas channel with liquid wall. The experiments show possibilities and efficiency of low-temperature plasma-chemical...

The yield of free hydrogen (H2) produced during plasma-chemical conversion of ethanol and water under the action of the electrical discharge in a gas channel with liquid wall is studied. The detailed numerical simulation of the kinetics of plasma-chemical processes in a plasma-liquid reactor, where a plasma-forming gas (air) is injected into the wo...

This work continues our studies of plasma conversion of ethanol in dynamic plasma-liquid systems with electric discharges in a gas channel with liquid wall. The plasma-assisted production of hydrogen in air-ethanol-water mixtures was investigated both experimentally and theoretically using available diagnostics and numerical models. The energy effi...

In this work we report recent results of our experimental and theoretical studies related to plasma conversion of liquid ethanol into hydrogen-enriched syngas in the plasma-liquid system with the electric discharge in a gas channel with liquid wall using available diagnostics and numerical modeling. [e-print arXiv:0809.0968]

New results on the influence of the O2(a1Δg) addition on the reaction mechanism and flammability in H2/O2(air) mixtures at various conditions are reported.

The effect of air on the concentration of molecular hydrogen in the conversion of ethanol by a nonequilibrium gas-discharge plasma is theoretically studied. Two models are developed to calculate plasma kinetics in two operation regimes of an experimental setup used for ethanol conversion into free hydrogen in order to increase the efficiency of the...

The invention relates to semiconductor optoelectronic technology, in particular, to technology for manufacturing photoelectric converters –solar cells based on silicon, which transform solar radiation into electrical energy and being used as effective sources of electricity. The method for manufacturing a photoelectric converter based on a silicon...

Paper presents results of complex experimental and theoretical studies related to plasma conversion of liquid ethanol into hydrogen-enriched syngas in the plasma-liquid system with the electric discharge in a gas channel with liquid wall using available diagnostics and numerical modeling are presented.

In the present article the complex theoretical and experimental investigation of plasma kinetics of a discharge in the mixture of air and vapors of ethanol and water is conducted. It is found out that the hydrogen output from the discharge is maximal in the case of equal amounts of ethanol and water. It is also shown that the concentration of hydro...

The complex theoretical and experimental investigation of plasma kinetics of the electric discharge in the mixture of air and ethanol-water vapors is carried out. The discharge was burning in the cavity, formed by air jets pumping between electrodes, placed in aqueous ethanol solution. It is found out that the hydrogen yield from the discharge is m...

The UV absorption spectra of polydisperse rutile TiO2 doped by transition metal cations Cr3+, Cu2+, Co2+ and Fe2+ are investigated at room temperature. It is shown that the fundamental absorption edge of TiO2 is determined by the two mechanisms of electron transitions: one of them represents a direct forbidden transition and the other is an indirec...

Results of investigations of the ethanol conversion in a electric discharge in a gas channel with liquid wall are presented. The parameters of discharge are studied. The gas-phase products of conversion are determined by using mass-spectrometry and gas chromatography. The energy consumption in the conversion of ethanol to synthesis gas is determine...

The electrical arc discharge in a transverse blowing gas flow (transverse arc - TA) and the discharge in gas flow surrounding by liquid (discharge in a gas channel with liquid wall - DGCLW) were studied as the sources of nonequilibrium plasma of atmospheric pressure. Diagnostics of both discharges was made by optical emission spectroscopy. The popu...

The properties of optical absorption of the samples of nanostructured titanium dioxide (TiO2) in the polymorph form of rutile in the UV, visible and NIR spectral range were studied and the changes of characteristics of its photoactivity under the influence of the doping by cations of transition metals (Fe, Cr, Co, Cu) are analyzed.

The fundamental absorption edge of polydisperse rutile doped with transition metal cations (Fe, Cu, Co, Cr) was investigated by UV spectroscopy at room temperature. It was shown that the fundamental absorption edge of TiO2 is determined by two electron transition mechanisms: one is the direct forbidden transition, another is the indirect allowed tr...

Generators of non-thermal atmospheric pressure plasma, such as gliding arc GA [1-4], gliding arc in tornado GAT [4,5], arc in the transverse blowing gas flow (transverse arc TA) [6-8] and discharge in the gas channel with liquid walls DGCLW [9] can ensure simultaneously high plasma density and operating pressure with high level of non-equilibrium....

As is known, interest to plasma-liquid systems in plasma-chemistry is connected, first of all, with the opportunity of increasing the selectivity of plasma action on a substance [1]. Therefore, special interest present plasma-liquid systems with the electrical discharge in the gas channel with a liquid wall (DGCLW) and plasma-liquid systems with a...

Properties of non-equilibrium plasma in the transverse arc discharge that occurs in air and argon jets at atmospheric pressure have been investigated by optical emission spectroscopy. The temperatures of population of excited electronic (Te), vibrational (Tv) and rotational (Tr) states of molecular and atomic components in plasma have been determin...

The results of researches of ethanol conversion in the electrical discharge plasma are presented. The emission spectroscopy analysis for investigation of discharge plasma was used. The mass-spectrometry and gas-chromatography for investigation of stable gas-phase conversion products were used. The power input on conversion of ethanol in synthesis-g...

Spectral characteristics of optical absorption of polydisperse rutile TiO2 nanoparticles doped by cations of iron group metals (Fe, Cr, Co, Cu) are analyzed and discussed.