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- Professor (Assistant)
January 2009 - September 2013
September 2013 - December 2019
Education
January 2009 - September 2013
Publications
Publications (78)
A model of the optoelectronic process in a molecular junction has been developed, in which electron transfer occurs through transmission channels associated with the filling of the π and π* orbitals of the fluorophore with transferred electrons. The contribution of each channel to the formation of current and electroluminescence (EL) is determined...
The article presents the results of a study on the generation of electricity using porous Ca6H2O19Si6 structures as an example during moisture adsorption. It has been determined that the potential difference at the contacts of a single‐layer structure of compacted Ca6H2O19Si6 particles depends on the time of formation of the potential‐determining a...
In this study, we considered the structural stability and electronic properties of ZrO2. We found that the monoclinic phase of zirconium dioxide is the most stable among the three phases in terms of total energy. The band gaps for c-ZrO2, t-ZrO2, and m-ZrO2 are 5.140 eV, 5.898 eV, and 5.288 eV, respectively. Calculations based on the analysis of th...
n this study, we considered the structural stability and electronic properties of ZrO2. We found that the monoclinic phase of zirconium dioxide is the most stable among the three phases in terms of total energy. The band gaps for c-ZrO2, t-ZrO2, and m-ZrO2 are 5.140 eV, 5.898 eV, and 5.288 eV, respectively. Calculations based on the analysis of the...
In this study, we considered the structural stability, electronic properties, and phonon dispersion of the cubic (c-ZrO2), tetragonal (t-ZrO2), and monoclinic (m-ZrO2) phases of ZrO2. We found that the monoclinic phase of zirconium dioxide is the most stable among the three phases in terms of total energy, lowest enthalpy, highest entropy, and othe...
In this study, we considered the structural stability, electronic properties, and phonon dispersion of the cubic (c-ZrO2), tetragonal (t-ZrO2), and monoclinic (m-ZrO2) phases of ZrO2. We found that the monoclinic phase of zirconium dioxide is the most stable among the three phases in terms of total energy, lowest enthalpy, highest entropy, and othe...
The article deals with the issues of structural stability, electronic properties and phonon dispersion of the cubic, tetragonal and monoclinic phase of ZrO2. The monoclinic phase of ZrO2 is found to be the most stable among all the phases of this compound, in terms of total energy comparison, the lowest enthalpy value, the highest entropy and the l...
The paper considers the issues of structural stability, electronic properties, and phonon dispersion of the cubic, tetragonal, and monoclinic phases of ZrO2. It was found that the monoclinic phase of zirconium dioxide is the most stable among the other two phases in terms of total energy, lowest enthalpy, highest entropy, and other thermodynamic va...
The article deals with the issues of structural stability, electronic properties and phonon dispersion of the cubic, tetragonal and monoclinic phase of ZrO2. The monoclinic phase of ZrO2 is found to be the most stable among all the phases of this compound, in terms of total energy comparison, the lowest enthalpy value, the highest entropy and the l...
The paper considers the issues of structural stability, electronic properties, and phonon dispersion of the cubic, tetragonal, and monoclinic phases of ZrO2. It was found that the monoclinic phase of zirconium dioxide is the most stable among the other two phases in terms of total energy, lowest enthalpy, highest entropy, and other thermodynamic va...
The paper considers the issues of structural stability, electronic properties, and phonon dispersion of the cubic, tetragonal, and monoclinic phases of ZrO2. It was found that the monoclinic phase of zirconium dioxide is the most stable among the other two phases in terms of total energy, lowest enthalpy, highest entropy, and other thermodynamic va...
The paper considers the issues of structural stability, electronic properties, and phonon dispersion of the cubic, tetragonal, and monoclinic phases of ZrO2. It was found that the monoclinic phase of zirconium dioxide is the most stable among the other two phases in terms of total energy, lowest enthalpy, highest entropy, and other thermodynamic va...
The paper considers the issues of structural stability, electronic properties, and phonon dispersion of the cubic, tetragonal, and monoclinic phases of ZrO2. It was found that the monoclinic phase of zirconium dioxide is the most stable among the other two phases in terms of total energy, lowest enthalpy, highest entropy, and other thermodynamic va...
A variational analysis of dispersion medium (electrolytes and surfactants) was carried out for the best nucleotide interactions with the presence of nanoparticles and the ability to formation of homogeneous coatings upon drying / lyophilization. Using UV-spectroscopy and transmission electron microscopy, the processes of immobilization of nucleotid...
The paper considers the new effects of the nanoscale state of matter, which open up prospects for the development of electronic devices using new physical principles. The contacts of chemically homogeneous nanoparticles of yttrium-stabilized zirconium oxide (ZrO2—x mol% Y2O3, x = 0, 3, 4, 8; YSZ) with different sizes of 7.5 nm and 9 nm; 7.5 nm and...
A variational analysis of dispersion medium (electrolytes and surfactants) was carried out for the best nucleotide interactions with the presence of nanoparticles and the ability to formation of homogeneous coatings upon drying / lyophilization. Using UV-spectroscopy and transmission electron microscopy, the processes of immobilization of nucleotid...
Taking into account the fact that the transitions between the states of a molecular junction are carried out against the background of much faster relaxation processes in molecular terms and the conduction bands of electrodes, kinetic equations for integral occupancies of the molecular terms, as well as expressions for the time-dependent electronic...
The paper considers new effects of the nanoscale state of matter, which open up prospects for the creation of electronic devices using new physical principles. The contact of chemically homogeneous different sizes hydrated nanoparticles of yttrium-stabilized zirconium oxide (ZrO2 – x %mol Y2O3, x=0, 3, 4, 8; YSZ) with particle sizes of 7.5 nm and 7...
![Figure 2. Densities of electronic states: a) for ZrO2 [34], b) for pure...](profile/Dilshod-Nematov/publication/362614783/figure/fig2/AS:11431281079015658@1660477238542/Densities-of-electronic-states-a-for-ZrO2-34-b-for-pure-TiO2-Fermi-level_Q320.jpg)
In this work, using theoretical calculations within the framework of the density functional theory, taking into account the dispersive VDW interaction, the processes of adsorption and interaction of a water molecule with a TiO2 surface in various configurations are investigated. At the atomic / molecular level, the interactions of a water molecule...
![Figure 2. Densities of electronic states: a) for ZrO2 [34], b) for pure...](profile/Dilshod-Nematov/publication/377381316/figure/fig2/AS:11431281217374112@1705151880923/Densities-of-electronic-states-a-for-ZrO2-34-b-for-pure-TiO2-Fermi-level_Q320.jpg)
In this work, using theoretical calculations within the framework of the density functional theory, taking into account the dispersive VDW interaction, the processes of adsorption and interaction of a water molecule with a TiO2 surface in various configurations are investigated. At the atomic / molecular level, the interactions of a water molecule...
![Figure 2. Densities of electronic states: a) for ZrO2 [34], b) for pure...](profile/Dilshod-Nematov/publication/378108919/figure/fig2/AS:11431281223021441@1707559835517/Densities-of-electronic-states-a-for-ZrO2-34-b-for-pure-TiO2-Fermi-level_Q320.jpg)
In this work, using theoretical calculations within the framework of the density functional theory, taking into account the dispersive VDW interaction, the processes of adsorption and interaction of a water molecule with a TiO2 surface in various configurations are investigated. At the atomic / molecular level, the interactions of a water molecule...
The dimensional effect of electric charge storage with a density of up to 270 μF/g by the hydrated ZrO2-nanoparticles system was determined. It was found that the place of localization of different charge carriers is the generalized heterophase boundary-nanoparticles surface. The supposed mechanism of the effect was investigated using the theory of...
Dynamic Light Scattering is a well-established technique used in particle sizing. An alternative procedure for Dynamic Light Scattering time series processing based on spectral entropy computation and Artificial Neural Networks is described. An error analysis of the proposed method was carried out and the results on both the simulated and on the ex...
This study is devoted to the development of new oxide materials and devices based on them for direct long-term production of electricity from ambient humidity, which can be used as an auxiliary power supply system for self-sufficient buildings. The simplest device, a tablet pressed from these powders, generates an electrical potential in the presen...
The effect of doping with silicon and aluminum oxides on the process of structure formation of ceramics based on yttrium-stabilized zirconium dioxide is investigated. Using the X-ray diffraction, internal friction, 4-point bending, and electron microscopy methods, it is shown that in the system of the powder system ZrO2+3 mol.% Y2O3 (YSZ)+n wt.% Si...
Электронная структура приповерхностных областей наночастиц оксидного материала особого типа и возможность на этой основе получения специфических выпрямляющих свойств контактаизучаются теоретически, а затем проверяются экспериментально. Построены модели поверхностных состояний типа Тамма с учетом кулоновского дальнодействия. Обнаруженная дисперсия и...
The current transfer through a two-layer structure saturated with absorbed water, each layer of which consists of pressed ZrO2 nanoparticles with two sizes (10 and 20 nm), has been studied. The structure was obtained using the isostatic pressing the ZrO2 + H2O powders. The form of current–voltage characteristics inherent to the studied structure, t...
The present study was aimed at revealing the influence of the mechanical stress induced by water molecule adsorption on the composition of crystalline phases in the ZrO2 + 3 mol% Y2O3-nanoparticles. Three basic methods were used to determine the phase transition: neutron diffraction, Raman microspectroscopic scanning, and X-ray diffraction. The fac...
This study is devoted to creating media for the accumulation of electrical energy based on zirconia nanoparticles. The effect of charge accumulation by compacted zirconia nanoparticles, the manifestation of which depends on the size of the particles and the degree of hydration of their surface, was found. It is shown that for the system of hydrated...
The dimensional effect of the accumulation of an electric charge with a density of up to 270 μF/g by the system of compacted zirconium dioxide nanoparticles during exposure in an electric field (5000 V/m) under normal physical conditions is determined. Based on a qualitative complex analysis of the forms of appearance of the effect, it is shown tha...
In the presented work, the parameters of a new MAPD-3NM-II photodiode with buried pixel structure manufactured in cooperation with Zecotek Company are investigated. The photon detection efficiency, gain, capacitance and gamma-ray detection performance of photodiodes are studied. The SPECTRIG MAPD is used to measure the parameters of the MAPD-3NM-II...
В работе с помощью квантово-химических расчетов в рамках теории функционала плотности (ТФП) исследованы геометрическая структура, электронные и оптические свойства нанокристаллов Cu2ZnSn(S1-xSex)4, где x = 0, 0,25, 0,50, 0,75, 1,00. Для расчетов электронных и оптических свойств использовались модифицированный обмен-корреляционный потенциал Беке-Джо...
This work is devoted to the demonstration of a real multifunctional material – zirconia based nanopowders, which can be used in the manufacture of various types of devices that convert natural energy sources into electricity (electrolyte and anode for SOFC, moisture-to-electricity converter). It was shown that such characteristics of nanopowders as...
The present study was aimed at revealing the influence of the mechanical stress induced by water molecules adsorption on the composition of crystalline phases in the ZrO2–3mol%Y2O3-nanoparticles. Three basic methods have been used to determine the phase transition: neutron diffraction, Raman microspectroscopic scanning, and X-ray diffraction. The f...
The present study was aimed at revealing the influence of the mechanical stress induced by water molecules adsorption on the composition of crystalline phases in the ZrO2–3mol%Y2O3-nanoparticles. Three basic methods have been used to determine the phase transition: neutron diffraction, Raman microspectroscopic scanning, and X-ray diffraction. The f...
A model has been proposed to describe the potential barrier that appears during interaction of two compacted layers consisting of hydrophilic oxide nanoparticles of different sizes in each layer upon saturation of this structure with adsorbed water. The dependence of the space charge density of the compacted powder material on the density of partic...
The geometric structure, electronic and optical properties of N-doped TiO 2 (TiO 2-x N x) were studied within the framework of density functional theory. The effective electron-electron exchange-correlation functional and the modified Becke-Johnson potential were used to calculate electronic and optical properties. The calculated optical parameters...
The SSHARE project will develop innovative self-sufficient envelope for buildings aimed at net zero energy, thereby contributing to the European technology. Envelope is a combination of two breaking through technologies: HUNTER-Humidity to Electricity Convertor and Advanced Radiant Panel for Buildings that will cool or heat the building, depending...
The work presents a successful example of the use of YSZ binary systems for production of composite ceramic materials based on θ-Al2O3 with improved physical and mechanical characteristics which was previously considered an unpromising material. It was first obtained result of extreme nature of dependence of physical and mechanical properties of Al...
A theoretical study of the mechanisms of electroluminescence (EL) generation in photoactive molecules with donor and acceptor centers linked by saturated σ-bonds (molecules of the Aviram–Ratner-type) is presented. The approach is based on the kinetics of single-electron transitions between many-body molecular states. This study shows that the EL po...
The work is devoted to the investigation of the electrophysical properties of nanopowder systems based on zirconia in a compacted form with varying degree of system hydration. The dependence of conductivity and activation energy of conductivity on the amount of moisture in the system was studied. It is shown that the value of the total impedance of...
Many plants have medicinal properties due to substances known as phytochemicals. To utilize these plants in practice, numerous procedures, such as extraction, isolation and characterization methods and toxicology and bioactivity studies, must be designed and implemented. Integrated approach to process Carpobrotus edulis, a weed medicinal plant wide...
Abstract
Based on the example of a nanopowder system ZrO2–
3% mol Y2O3
with atmospheric humidity interaction, the possibility
of exothermic heterophase electrochemical energy conversion to electric energy is shown. Electrical properties and structure
of the experimental sample were studied under gradient molecular flux density of humidity during sa...
The present paper is devoted to the problem of sealing zirconia nanopowder. We studied the effect of the water content in zirconia nanopowder on the process of sealing this powder. We found that the shrinkage, specific surface area and weight loss of a nanopowder system based on zirconia during sealing substantially depend from the level of ambient...
Development of a new electricity generation techniques is one of the most relevant tasks, especially nowadays under conditions of extreme growth in energy consumption. The exothermic heterogeneous electrochemical energy conversion to the electric energy through interaction of the ZrO2 based nanopowder system with atmospheric moisture is one of the...
The exothermic heterogeneous electrochemical energy conversion to the electric energy through interaction of the ZrO2 based nanopowder system with atmospheric moisture have been explored within this work. Electrical properties of the experimental samples were investigated during humidification at the conditions of molecular flux density gradient. T...
Issues concerned with the energy conversion of exothermal heterophase processes are discussed using the physico-chemical interaction between ZrO2–Y2O3 (3 mol %) nanopowder system and atmospheric moisture as an example. The electrical properties of an experimental sample are investigated upon moisture saturation in the case of a molecular-flow densi...
The growing interest in exploring thin film technologies to produce n-i-p silicon solar cells on low cost substrates (such as plastic, ceramic and more recently, paper), with outstanding performances and capability to address the energy market needs, turns the optimization of their fabrication process a key area of development. A combination of des...
The issues related to the exothermic heterogeneous electrochemical energy conversion to the electric energy through interaction of the ZrO2 based nanopowder system with atmospheric moisture moisture. Electrical properties of the experimental samples were investigated during humidification at the conditions of molecular flux density gradient. The mo...
The regime of waveoptics is highly promising for light management in non-wafer-based photovoltaics [1].Several strategies have been proposed employing the anti-reflection and forward scattering properties of high-index dielectric scatterers patterned on the illuminated face of solar cells to boost their absorption while reducing the physical thickn...
The post-deposition modification of ZnO-based transparent conductive oxides (TCOs) can be the key to produce thin films with optoelectronic properties similar to indium tin oxide (ITO), but at a much lower cost. Here, we present electro-optical results achieved for post-deposition annealing of Al–Zn–O (AZO), AZO:H, Ga–Zn–O:H (GZO:H), and Zn–O:H (ZN...
The adsorption equilibria of ethane (C2H6) and ethylene (C2H4) in the MIL-53(Al) metal organic framework are characterized using a self-consistent procedure combining experimental measurements and molecular simulation. Experimental single-component adsorption equilibrium data for C2H6 at 303 K, 323 K, 353 K, and 0–8 bar, and for C2H4 at 323 K, 353...
A laboratory-based methodology was designed to assess the bioreceptivity of glazed tiles. The experimental set-up consisted of multiple steps: manufacturing of pristine and artificially aged glazed tiles, enrichment of phototrophic microorganisms, inoculation of phototrophs on glazed tiles, incubation under optimal conditions and quantification of...
The kinetic parameters of the adsorption process at “liquid–solid” interface have been evaluated through the sets of time-based experiments of the Cr(III) adsorption under varying temperature, initial metal concentration, and carbon loading for two sets of the commercially available activated carbons and their post-oxidized forms with different tex...
Indium tin oxide (ITO) is the current standard state-of-the-art transparent conductive oxide (TCO), given its remarkable optical and electrical properties. However, the scarcity of indium carries an important drawback for the long-term application due to its intensive use in many optoelectronic devices such as displays, solar cells, and interactive...
Abstract The p/i interface plays a major role in the conversion efficiency of nanocrystalline silicon (nc-Si:H) solar cells. Under plasma-enhanced chemical vapor deposition (PECVD) of the intrinsic (i) nc-Si:H layer, ion bombardment can severely affect the underlying p-doped layer and degrade the solar cell performance. The core of the present work...
Nowadays there is a strong demand for intelligent packaging to provide comfort, welfare and security to owners, vendors and consumers, by allowing them to know the contents and interact with the goods. This is of particular relevance for low cost, fully disposable and recyclable products like identification tags, medical diagnostic tests, and devic...
The intense light scattered from metal nanoparticles sustaining surface plasmons makes them attractive for light trapping in photovoltaic applications. However, a strong resonant response from nanoparticle ensembles can only be obtained if the particles have monodisperse physical properties. Presently, the chemical synthesis of colloidal nanopartic...
Data on a synergetic phenomena of the components of the co-mingled solid and liquid wastes occurs during their thermolysis were used for the development of the co-activation approach to wastes recycling. Co-activation was aimed at generation of porous solid valuable secondary products (activated carbons). The development of the design parameters fo...
Data on a synergetic phenomena of the components of the co-mingled solid and liquid wastes occurs during their thermolysis were used for the development of the co-activation approach to wastes recycling. Co-activation was aimed at generation of porous solid valuable secondary products (activated carbons). The development of the design parameters fo...
Review of the current state of the art on the pathways of the harmful disinfection by-products of the triclosan into environment is given. Several case studies of the Waste Water Treatment Plan´s (WWTP) liquid and solid stocks contained by triclosan were executed. Results on environmental monitoring from are presented and discussed. Work strategy w...
The low- to high-occupancy adsorption thermodynamics of light alkanes (C1-C4) in the large-pore structure of MIL-53(Al) was predicted from grand canonical Monte Carlo (GCMC) simulations and compared with experimental gravimetric data. The adsorption experiments span a broad range of pressures (0.01-7 MPa) and temperatures (303-353 K). The adsorptio...
Over the past decade, a large number of hybrid organic-inorganic porous solids belonging to a new class of structured nanoporous materials—metal-organic frameworks (MOFs)—have been synthesized and structurally characterized. Due to their high porosity, high adsorption capacity, and thermal stability, these materials have shown great potential for a...
The adsorption equilibrium properties of supercritical methane in the large-pore (lp) structure of the MIL-53(Al) metal organic framework were studied experimentally by gravimetric adsorption and theoretically by grand canonical Monte Carlo (GCMC) simulation. The adsorption experiments span a broad range of pressures (0.01–7 MPa) and temperatures (...
The main purpose of the present work was to study the simultaneous removal of 3d transition metals from multi-component solutions by novel porous material obtained from carbon-containing liquid and solid waste. The activated carbon was prepared from co-mingled natural organic waste: 25% sunflower husks, 50% petroleum waste and 25% low-grade bitumin...
In order to understand the patterns of the adsorption equilibrium of Cr (III) on activated carbon, the adsorption process
was studied by two different ways: classical batch experiments on commercial Norit and Merck activated carbons and their oxidized
forms in a wide range of pHs; and extended time-based tests at the same pH values on the same adso...
The kinetics and the thermodynamics of the chromium(III) adsorption on novel activated carbons prepared from co-mingled natural organic wastes have been studied by the sets of equilibrium and time-based experiments at various conditions (temperature, initial chromium concentration and carbon loading). The results are compared to those for commercia...
