ВВ

В. В. Козаченко

Taras Shevchenko National University of Kyiv

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Oleg A. Yeshchenko

Taras Shevchenko National University of Kyiv

Anatoliy O. Pinchuk

University of Colorado Colorado Springs

Michael I. Haftel

Plasmonics (United States)

Anastasiya V. Tomchuk

Taras Shevchenko National University of Kyiv

T. L. Tsaregradskaya

Taras Shevchenko National University of Kyiv

G. V. Saenko

Taras Shevchenko National University of Kyiv

O. V. Turkov

Taras Shevchenko National University of Kyiv

АМ

А. М. Kuryliuk

Taras Shevchenko National University of Kyiv

СК

С.В. Кондратенко

Taras Shevchenko National University of Kyiv

Oleg Korotchenkov

Taras Shevchenko National University of Kyiv

Cooperative Institutions

Taras Shevchenko National University of Kyiv

National Academy of Sciences of Ukraine

Kyiv City Clinical Oncology Center

Pennsylvania State University

Technische Universität Ilmenau

G.V. Kurdyumov Institute for Metal Physics

University of Colorado Colorado Springs

Plasmonics (United States)

MetaMateria (United States)

Russian Academy of Sciences

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Effect of Ultrasonic Cavitation Treatment on Micromechanical Properties of Amorphous Alloys

METALLOFIZIKA I NOVEISHIE TEKHNOLOGII (2021)

T. L. Tsaregradskaya I. V. Plyushchay В. В. Козаченко А. М. Kuryliuk Stanislav Rozouvan

Експериментально досліджено вплив ультразвукової кавітаційної обробки на мікромеханічні властивості аморфного стопу Fe 76 Ni 4 Si 6 B 14 .Показано, що мікротвердість аморфного стопу після проведеної ультразвукової кавітаційної обробки інтенсивністю (1-2) Вт/см 2 зменшується на (10-28)%, що непрямим чином підтверджує факт зменшення частки кристалічної фази в стопі за рахунок зменшення розмірів вморожених центрів кристалізації.Цей факт підтверджується дослідженнями морфології поверхні аморфного стопу, проведеними за допомогою атомного силового мікроскопу.Пластифікуючий вплив ультразвукової кавітаційної обробки на аморфний стоп можна пояснити розчиненням вморожених центрів кристалізації в аморфній матриці.

10.15407/mfint.43.03.0329

Cite

Citations (0)

Effect of constant magnetic field on the properties of transition metals based amorphous alloys

Molecular Crystals and Liquid Crystals (2022)

T. L. Tsaregradskaya I. V. Ovsiienko В. В. Козаченко A. M. Kurilyik G. V. Saenko

The micromechanical properties of amorphous alloys Co67Fe3Cr3Si15B12 and Ni40Fe40B20 are nonmonotonically dependent on time of exposure in the magnetic field is established in the work. Magnetic treatment causes two competing processes that cause changes in the microhardness and temperature of the onset of intense crystallization. The first is fast-acting, associated with the decay of clusters (borides and silicides), that causes plasticization (reduction of microhardness by (22–27)%) and increase the temperature of thermal stability by (50–70)°C. The second process is long-term, associated with the growth of frozen crystallization centers. This process leads to a strengthening of the structure and, as a result, to decrease in the magnitude of magnetoplastic effect and the effect of thermal stability increasing.

Thermal Stability

10.1080/15421406.2022.2091269

Cite

Citations (0)

Nickel-Fullerene Nanocomposites as Thermoelectric Materials

Nanomaterials (2022)

Andriy Nadtochiy В. В. Козаченко Oleg Korotchenkov V. Schlosser

Nickel films with nanovoids filled with fullerene molecules have been fabricated. The thermoelectric properties of the nanocomposites have been measured from room temperature down to about 30 K. The main idea is that the phonon scattering can be enhanced at the C60/matrix heterointerface. The distribution of atoms within the Ni and Ni-C60 layers has been characterized by Auger depth profiling. The morphology of the grown samples has been checked using cross-sectional scanning electron microscopy (SEM). The Seebeck coefficient and electrical conductivity have been addressed employing an automatic home-built measuring system. It has been found that nanostructuring using Ar+ ion treatment increases the thermopower magnitude over the entire temperature range. Incorporating C60 into the resulting voids further increased the thermopower magnitude below ≈200 K. A maximum increase in the Seebeck coefficient has been measured up to four times in different fabricated samples. This effect is attributed to enhanced scattering of charge carriers and phonons at the Ni/C60 boundary.

Phonon scattering

Atmospheric temperature range

10.3390/nano12071163

Cite

Citations (2)

Surface Plasmon Enhanced Photoluminescence of Rhodamine 6G on Au Nanoparticles 2D Array: Temperature Effects

Oleg A. Yeshchenko Illya S. Bondarchuk В. В. Козаченко M. Yu. Losytskyy

Rhodamine 6G

Source

Cite

Citations (0)

Thermal diffusivity of nanocarbon composites

Polymer Composites (2010)

O. A. Lazarenko Л. Л. Вовченко L. Yu. Matzui В. В. Козаченко Yu. І. Prylutskyy

Abstract This study was performed to measure the thermal diffusivity of different types of nanocarbon composites. Thermoexfoliated graphite (TEG), ultrasonically dispersed TEG, and multiwalled carbon nanotubes were used as fillers in epoxy polymer matrixes. The nanocarbon filler content was 1–10 wt%. The temperature dependence of the thermal conductivity and the heat capacity were extensively characterized in the temperature range between 150 and 425 K. For this purpose, the thermal diffusivity of the composites was investigated by two experimental methods: dynamic λ‐calorimeter and photoacoustic. The comparative analysis of thermal diffusivity of compacted TEG samples with different densities and of nanocarbon‐epoxy with different filler content was carried out. It was found that for the composites with a low distribution of the nanocarbon filler, the thermal diffusivity increases and that the value is determined by the structural and morphological properties of the filler. The orientation function for the TEG‐epoxy composites and the compact TEG samples differs due to the epoxy matrix that reduced anisotropy of the composite. POLYM. COMPOS., 2011. © 2010 Society of Plastics Engineers

Filler (materials)

10.1002/pc.21009

Cite

Citations (2)

Surface Plasmon Resonance in “Monolayer of Ni Nanoparticles/Dielectric Spacer/Au (Ni) Film” Nanostructure

Ukrainian Journal of Physics (2018)

Oleg A. Yeshchenko В. В. Козаченко Anastasiya V. Tomchuk

The dual surface plasmon resonance in Ni nanoparticles in “monolayer of Ni nanoparticles/shellac film/Au (Ni) film” planar nanostructures has been observed in UV-vis absorption spectra. The dependences of the intensity, wavelength, and width of the dual SPR absorption peaks of Ni nanoparticles coupled with an Au (Ni) film on the spacer thickness have been studied in the range of spacer thicknesses of 12–43 nm. The main features of these dependences are an increase of the intensity, the blue shift, and the monotonic behavior of the widths of SPR absorption peaks at a decrease of the spacer thickness. The observed dependences have been rationalized as a result of the plasmonic coupling of the monolayer of Ni nanoparticles withthe metal film and the variation of the dielectric permittivity of the environment of Ni nanoparticles caused by the metal film presence. The stronger dependences of the SPR spectral characteristics of Ni nanoparticles have been observed in the nanostructure containing the gold film comparing to that with a nickel one. Such effect is due to the stronger coupling of Ni nanoparticles with an Au film, and the stronger influence of an Au film on the permittivity of the environment of Ni nanoparticles.

Localized surface plasmon

10.15407/ujpe63.5.386

Cite

Citations (7)

Planar plasmonic nanocavity for efficient enhancement of photoluminescence of molecular emitters

Optical Materials (2019)

Oleg A. Yeshchenko Anastasiya V. Tomchuk В. В. Козаченко A. P. Naumenko Yu. L. Slominskiĭ

10.1016/j.optmat.2019.06.015

Cite

Citations (6)

Photoluminescence of rhodamine 6G in plasmonic field of Au nanoparticles: Temperature effects

Journal of Luminescence (2014)

Oleg A. Yeshchenko Illya S. Bondarchuk В. В. Козаченко M. Yu. Losytskyy

Rhodamine 6G

Rhodamine

10.1016/j.jlumin.2014.10.018

Cite

Citations (14)

Angle and polarization dependent coupling of surface plasmon and gap modes in plasmonic gap metasurfaces

Optical Materials (2022)

Oleg A. Yeshchenko Anastasiya V. Tomchuk В. В. Козаченко Randal J. Knize Michael I. Haftel

Localized surface plasmon

10.1016/j.optmat.2022.112884

Cite

Citations (3)

Поверхнева фото-ерс структур Au−C60−Si

Ukrainian Journal of Physics (2022)

В. В. Козаченко С.В. Кондратенко Є.Є. Мельничук О.І. Даценко З.Ф. Цибрій

У роботі методами спектроскопії поверхневої фото-ерс, фото-люмінесценції, AFM та FTIR досліджено структуру Au–C60–Si. Досліджено також кінетику поверхневої фото-ерс. Показано, що фотолюмінесценція та поверхнева фото-ерс в інтервалі 1,3–1,8 еВ зумовлені оптичними переходами за участі синглетних та триплетних екситонних станів. Встановлено, що генерація поверхневої фото-ерс у структурі Au–C60–Si зумовлена просторовим розділенням електронно-діркових пар в плівці C60.

10.15407/ujpe56.3.263

Cite

Citations (0)