V.О. Yukhymchuk
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View article: Optical, structural and radiospectroscopic studies of ZnO/MnO nanostructures synthesized by ultrasonic spray pyrolysis
Optical, structural and radiospectroscopic studies of ZnO/MnO nanostructures synthesized by ultrasonic spray pyrolysis Open
The technology for the synthesis of nanocrystals (NCs) of pure ZnO and ZnO doped with a magnetic Mn impurity in concentrations of 2% and 4% by ultrasonic spray pyrolysis has been developed. The structural, morphological and optical propert…
View article: Research on high-temperature graphitization of anthracite using Raman and electron paramagnetic resonance spectroscopy
Research on high-temperature graphitization of anthracite using Raman and electron paramagnetic resonance spectroscopy Open
Introduction The high-temperature graphitization of anthracite is a key process for producing artificial graphite with properties comparable to natural graphite. However, the kinetics and structural evolution of carbon materials under rapi…
View article: Tracking the thermostimulated transformations of silicon suboxide film through absorption edge characterization
Tracking the thermostimulated transformations of silicon suboxide film through absorption edge characterization Open
In this work, the structural transformations of a suboxide vacuum-deposited film of SiO1.3 composition annealed in an inert atmosphere in a wide temperature range of 100 °C–1100 °C were characterized by the reflection-transmission spectros…
View article: Raman study of colloidal Cu2ZnSnS4 nanocrystals obtained by “green” synthesis modified by seed nanocrystals or extra cations in the solution
Raman study of colloidal Cu2ZnSnS4 nanocrystals obtained by “green” synthesis modified by seed nanocrystals or extra cations in the solution Open
The method of affordable colloidal synthesis of nanocrystalline Cu2ZnSnS4 (CZTS) is developed, which is suitable for obtaining bare CZTS nanocrystals (NCs), cation substituted CZTS NCs, and CZTS-based hetero-NCs. For the hetero-NCs, the sy…
View article: Surface-enhanced Raman scattering of As2S3 and Se thin films formed on Au nano-structures
Surface-enhanced Raman scattering of As2S3 and Se thin films formed on Au nano-structures Open
The effect of plasmonic nanostructures (NSs) on the Raman spectra and underlying structural changes in thin chalcogenide films is investigated. Several tens of nanometers thick As 2 S 3 and Se films were deposited by thermal sputtering on …
View article: Luminescent and Raman study of nanostruc-tures formed upon annealing of SiOx:Sm films
Luminescent and Raman study of nanostruc-tures formed upon annealing of SiOx:Sm films Open
ncs-Si–SiO x :Sm structures formed by high-temperature air annealing of the SiO x films doped with samarium during thermal co-evaporation in vacuum of silicon monoxide and metallic Sm was studied. By measuring the spectra of photoluminesce…
View article: Raman- and Infrared-Active Phonons in Nonlinear Semiconductor AgGaGeS4
Raman- and Infrared-Active Phonons in Nonlinear Semiconductor AgGaGeS4 Open
AgGaGeS4 is an emerging material with promising nonlinear properties in the near- and mid-infrared spectral ranges. Here, the experimental phonon spectra of AgGaGeS4 single crystals synthesized by a modified Bridgman method are presented. …
View article: Exciton-Assisted UV Stimulated Emission with Incoherent Feedback in Polydisperse Crystalline ZnO Powder
Exciton-Assisted UV Stimulated Emission with Incoherent Feedback in Polydisperse Crystalline ZnO Powder Open
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 photolumine…
View article: Exciton-Assisted UV Stimulated Emission with Incoherent Feedback in Polydisperse Crystalline ZnO Powder
Exciton-Assisted UV Stimulated Emission with Incoherent Feedback in Polydisperse Crystalline ZnO Powder Open
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 pho…
View article: Plasmonic Colloidal Au Nanoparticles in DMSO: A Facile Synthesis and Characterisation
Plasmonic Colloidal Au Nanoparticles in DMSO: A Facile Synthesis and Characterisation Open
We report a new pathway for the synthesis of plasmonic gold nanoparticles (Au NPs) in a bio-compatible medium. A modified room temperature approach based on the standard Turkevich synthesis, using sodium citrate as a reducing and stabilizi…
View article: Colloidal Cu-Zn-Sn-Te Nanocrystals: Aqueous Synthesis and Raman Spectroscopy Study
Colloidal Cu-Zn-Sn-Te Nanocrystals: Aqueous Synthesis and Raman Spectroscopy Study Open
Cu-Zn-Sn-Te (CZTTe) is an inexpensive quaternary semiconductor that has not been investigated so far, unlike its intensively studied CZTS and CZTSe counterparts, although it may potentially have desirable properties for solar energy conver…
View article: Spectroscopy and Theoretical Modeling of Phonon Vibration Modes and Band Gap Energy of Cu<sub>2</sub>ZnSn(S<sub><i>x</i></sub>Se<sub>1–<i>x</i></sub>)<sub>4</sub>Bulk Crystals and Thin Films
Spectroscopy and Theoretical Modeling of Phonon Vibration Modes and Band Gap Energy of Cu<sub>2</sub>ZnSn(S<sub><i>x</i></sub>Se<sub>1–<i>x</i></sub>)<sub>4</sub>Bulk Crystals and Thin Films Open
Semiconductor Cu2ZnSn(S x Se1-x )4 (CZTSSe) solid solution is considered as a perspective absorber material for solar cells. However, during its synthesis or deposition, any modification in the resulting optical properties is hardly predic…
View article: OPTICAL PROPERTIES OF NANOSIZED ZINC OXIDE OBTAINED BY ELECTROCHEMICAL METHOD
OPTICAL PROPERTIES OF NANOSIZED ZINC OXIDE OBTAINED BY ELECTROCHEMICAL METHOD Open
For the synthesis of nanostructured ZnO, the electrolytic method developed by the authors was used, the advantages of which are the environmentally friendly and low-cost process, low synthesis temperatures (20-98°C), and no need for comple…
View article: Properties of nanosized ΖnO: Ho films deposited using explosive evaporation
Properties of nanosized ΖnO: Ho films deposited using explosive evaporation Open
The properties of nanosized ZnO:Ho thin films deposited by explosive evaporation method have been studied. This work is aimed at studying the effect of high deposition rate on the oxide characteristics interesting from the viewpoint of pho…
View article: Colloidal Cu2ZnSnS4-based and Ag-doped Nanocrystals: Synthesis and Raman Spectroscopy Study
Colloidal Cu2ZnSnS4-based and Ag-doped Nanocrystals: Synthesis and Raman Spectroscopy Study Open
Cu2ZnSnS4 (CZTS) is one of the promising materials for absorber layers of new-generation thin film solar cells. Various synthetic routes of materials preparation and structural characterization have been explored so far. Further tuning of …
View article: STRUCTURE INVESTIGATION OF CHALCOGENIDES Ce0,5R1,5PbSi2S8 AND Pr1,5R0,5PbSi2S8 (R' – Tb, Y, Er)
STRUCTURE INVESTIGATION OF CHALCOGENIDES Ce0,5R1,5PbSi2S8 AND Pr1,5R0,5PbSi2S8 (R' – Tb, Y, Er) Open
The crystal structure of the chalcogenide phases Ce0,5R'1,5PbSi2S8 and Pr1,5R'0,5PbSi2S8 (R' – Tb, Y, Er) have been determined by means X-ray powder diffraction and Raman spectroscopy. These phases are separate compositions of solid soluti…
View article: The Effect of Chemical Composition and Electrolyte Temperature on the Size and Structure of Cadmium Sulfide Nanocrystals Obtained by the Electrolytic Method
The Effect of Chemical Composition and Electrolyte Temperature on the Size and Structure of Cadmium Sulfide Nanocrystals Obtained by the Electrolytic Method Open
Нанокристали сульфіду кадмію (CdS) отримано електролітичним методом в скляному електролізері з кадмієвими електродами. В якості електроліту використано розчини Na2S2O3, Na2SO3 та Na2S в дистильованій воді. При електролізі температура елект…
View article: Raman characterization of Cu<sub>2</sub>ZnSnS<sub>4</sub> nanocrystals: phonon confinement effect and formation of Cu<sub>x</sub>S phases
Raman characterization of Cu<sub>2</sub>ZnSnS<sub>4</sub> nanocrystals: phonon confinement effect and formation of Cu<sub>x</sub>S phases Open
A Raman spectroscopic study of Cu2ZnSnS4 (CZTS) nanocrystals (NCs) produced by a “green” synthesis in aqueous solutions is reported.
View article: Design and characterization of nanostructured SERS substrates based on gold nanostars
Design and characterization of nanostructured SERS substrates based on gold nanostars Open
Using the method of chemical synthesis, effective SERS substrates were developed, which were the films of gold nanoparticles possessing the form of stars. The peculiarity of star-shaped nanoparticles is that they could enhance the electric…
View article: Fermi resonance in the phonon spectra of quaternary chalcogenides of the type Cu<sub>2</sub>ZnGeS<sub>4</sub>
Fermi resonance in the phonon spectra of quaternary chalcogenides of the type Cu<sub>2</sub>ZnGeS<sub>4</sub> Open
The experimental resonant and non-resonant Raman scattering spectra of the kesterite structural modification of Cu2ZnGeS4 single crystals are reported. The results are compared with those calculated theoretically within the density functio…
View article: Optical properties of quaternary kesterite-type Cu<sub>2</sub>Zn(Sn<sub>1−x</sub>Ge<sub>x</sub>)S<sub>4</sub>crystalline alloys: Raman scattering, photoluminescence and first-principle calculations
Optical properties of quaternary kesterite-type Cu<sub>2</sub>Zn(Sn<sub>1−x</sub>Ge<sub>x</sub>)S<sub>4</sub>crystalline alloys: Raman scattering, photoluminescence and first-principle calculations Open
The transformation of the vibrational spectrum of Cu2Zn(Sn1−xGex)S4single crystals over the entire composition range (0 ≤x≤ 1) is studied experimentally as well as theoretically.
View article: The Influence of Technological Modes on the Physical Properties of Cadmium Sulfide Nanocrystals Derived by the Electrolyte Method
The Influence of Technological Modes on the Physical Properties of Cadmium Sulfide Nanocrystals Derived by the Electrolyte Method Open
The effect of concentration of sodium thiosulfate and the temperature of the electrolyte in the process of obtaining cadmium sulfide nanocrystals electrolyte method using cadmium electrodes. X-ray diffraction studies were used to determine…