A5067409210- Silicon Nanostructures and Photoluminescence
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Nanowire Synthesis and Applications
- Luminescence Properties of Advanced Materials
- Semiconductor materials and devices
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Microwave Dielectric Ceramics Synthesis
- Ion-surface interactions and analysis
- Thin-Film Transistor Technologies
- Ga2O3 and related materials
- Catalytic Processes in Materials Science
- Semiconductor materials and interfaces
- Ferroelectric and Piezoelectric Materials
- Nuclear materials and radiation effects
- Advanced biosensing and bioanalysis techniques
- Semiconductor Quantum Structures and Devices
- Covalent Organic Framework Applications
- Nanocluster Synthesis and Applications
- Electrical and Thermal Properties of Materials
- Magnesium Oxide Properties and Applications
- Optical properties and cooling technologies in crystalline materials
L.V. Pisarzhevskii Institute of Physical Chemistry
2022-2025
V.E. Lashkaryov Institute of Semiconductor Physics
2014-2024
National Academy of Sciences of Ukraine
2005-2024
National Academy of Sciences
2010
This paper discusses the possibility of determining k-values for active admixtures concerning durability factors such as depth penetration water under pressure and carbonation cement mortars with fly ash. The k-value considers use in concrete when calculating water/cement ratio equivalent amount binder. Currently, only effect admixture on compressive strength is considered k-value, but not durability. To account influence determination mathematical functions property, dependent age mortar,...
Abstract Undoped and Mn-doped ZnO ceramics were prepared from the powders compacted at different pressures sintered in air high temperature. Their structural, optical, light emitting electrical characteristics as well distribution of chemical elements studied. It was found that an increase compacting pressure stimulates direct current conductivity both undoped doped samples. In case samples, this effect accompanied by a decrease height potential barriers grain boundaries. is electron...
The results of the investigations photoluminescence (PL) in ZnO and ZnO-based composite materials are presented. PL excitation (PLE) spectra undoped doped with I group elements or rear earth ions polycrystalline films, ZnO, Zn<sub>1–x</sub>Mg<sub>x</sub>O ZnMgO–TiO<sub>2</sub> ceramics were studied. structural properties samples investigated X-ray diffraction. Polycrystalline films prepared by a screen-printing method annealed at T<sub>S </sub>= 500–1000 °C. </sub>< 800 °C exhibited...
The samples ZnO:Mn were prepared using the conventional solid-state technique. To dope them with manganese, we used water solutions of MnSO4 and MnCl2. properties inherent to both types obtained ceramics have been compared. It was found that former demonstrated nonlinear current-voltage characteristics, whereas those latter were, in fact, linear. analysis EPR, diffuse reflectance Raman spectra for allowed concluding that, doped MnSO4, formation Mn-related phase, namely, ZnMn2O4 spinel...
Luminescence and structural properties of pure Y-doped ZrO2 nanopowders with different Y content synthesized by co-precipitation Zr salts were investigated x-ray diffraction, transmission electron microscopy, paramagnetic resonance (EPR) photoluminescence (PL) methods. It was found that at constant calcination temperature (700 °С), the increase stimulates transformation crystalline phase from monoclinic through tetragonal to cubic one. Generally, room PL emission be similar for samples...
The effect of both CuO content (1 and 8 mol%) calcination temperature (Tc = 500–1000°C) on light emitting structural properties ZrO2-Y2O3-CuO nanopowders was studied by photoluminescence (PL), X-ray diffraction (XRD) Raman scattering methods. samples, calcinated at Tc 500–700°C, contain the tetragonal ZrO2 phase predominantly. increase results in its transformation to monoclinic one, happens higher Cu content. It is shown that from 500 800°C incorporation into nanocrystals surface entities....
Abstract In this study, we show that the use of a mixture melamine and oxalic acid during synthesis acid-treated crystalline graphitic carbon nitride samples significantly enhances its photocatalytic activity in VOCs destruction processes. The rate ethanol with participation modified obtained under optimal conditions is 67.1 μmol h −1 , which almost twice higher than sample synthesized absence acid, two orders magnitude bulk g–C 3 N 4 . materials were characterized using XRD, FT-IR, UV–Vis,...
Boron-doped bulk samples of graphitic carbon nitride (B-g-C3N4) were synthesized by pyrolysis melamine-boric acid mixtures, followed their subsequent annealing in a eutectic melt potassium and lithium chlorides, resulting the formation crystalline g-C3N4 (B-CGCN). The obtained materials demonstrate significantly higher activity hydrogen evolution from aqueous-ethanolic solutions under visible light irradiation compared to undoped CGCN. Under optimized conditions, effective quantum yield...
Abstract Silicon-rich Al 2 O 3 films (Si x (Al ) 1− were co-sputtered from two separate silicon and alumina targets onto a long oxide substrate. The effects of different annealing treatments on the structure light emission versus investigated by means spectroscopic ellipsometry, X-ray diffraction, micro-Raman scattering, micro-photoluminescence (PL) methods. formation amorphous Si clusters upon deposition process was found for with ≥ 0.38. treatment at 1,050°C to 1,150°C results in...