Oleg A. Yeshchenko

Taras Shevchenko National University of Kyiv

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Igor Dmitruk

Taras Shevchenko National University of Kyiv

Nataliya Kutsevol

Taras Shevchenko National University of Kyiv

A. A. Alexeenko

Sukhoi State Technical University of Gomel

Andriy Dmytruk

Institute of Physics

Anatoliy O. Pinchuk

University of Colorado Colorado Springs

Vasyl Chumachenko

Taras Shevchenko National University of Kyiv

ВВ

В. В. Козаченко

Taras Shevchenko National University of Kyiv

Anastasiya V. Tomchuk

Taras Shevchenko National University of Kyiv

I. S. Gorban

Taras Shevchenko National University of Kyiv

A. P. Naumenko

Taras Shevchenko National University of Kyiv

Cooperative Institutions

Taras Shevchenko National University of Kyiv

National Academy of Sciences of Ukraine

V.E. Lashkaryov Institute of Semiconductor Physics

Institute of Physics

Shenzhen University

Kyiv City Clinical Oncology Center

Clemson University

University of Colorado Colorado Springs

Centre National de la Recherche Scientifique

G.V. Kurdyumov Institute for Metal Physics

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Optical study of ZnP2 nanoparticles in zeolite Na–X

Solid State Communications (2004)

Oleg A. Yeshchenko Igor Dmitruk S. V. Koryakov Iryna Pundyk Yu. A. Barnakov

Stokes shift

Blueshift

Crystal (programming language)

Absorption band

10.1016/j.ssc.2004.10.007

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Citations (22)

Optical Spectra and Structure of CdP₄ Nanoclusters Fabricated by Incorporation into Zeolite and Laser Ablation

The Journal of Physical Chemistry B (2005)

Oleg A. Yeshchenko Igor Dmitruk S. V. Koryakov M.P. Galak

CdP(4) nanoclusters were fabricated by incorporation into the pores of zeolite Na-X and by deposition of the clusters onto a quartz substrate using the laser ablation-evaporation technique. Absorption and photoluminescence (PL) spectra of CdP(4) nanoclusters in zeolite were measured at temperatures 4.2, 77, and 293 K. Both absorption and PL spectra consist of two blue-shifted bands. We performed DFT calculations to determine the most stable clusters configuration in the size region up to the size of the zeolite Na-X supercage. The bands observed in absorption and PL spectra were attributed to the emission of (CdP(4))(3) and (CdP(4))(4) clusters with binding energies of 3.78 and 4.37 eV per atom, respectively. The Raman spectrum of CdP(4) clusters in zeolite proved the fact of creation of (CdP(4))(3) and (CdP(4))(4) clusters in zeolite pores. The PL spectrum of CdP(4) clusters produced by laser ablation consists of a single band that was attributed to the emission of the (CdP(4))(4) cluster.

Nanoclusters

Laser Ablation

10.1021/jp053688g

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Citations (5)

Optical spectra and structure of (ZnAs2)n subnanoclusters fabricated by incorporation into zeolite and laser ablation

Materials Science and Engineering C (2006)

Oleg A. Yeshchenko Igor Dmitruk S. V. Koryakov M.P. Galak Iryna Pundyk

Laser Ablation

Optical spectra

10.1016/j.msec.2006.09.015

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Citations (0)

Formation Conditions and Morphology of Nanoscale Features on the Surfaces of Metals and Alloys under Femtosecond Laser Treatment

METALLOFIZIKA I NOVEISHIE TEKHNOLOGII (2019)

Igor Dmitruk Nataliya Berezovska Oleg A. Yeshchenko Oleksandr Stanovyi Andriy Dmytruk

Surface texturing of metals and alloys with Ti: Sapphire femtosecond laser has been carried out in air.The peculiarities of surface patterns formed on the surface of noble metals (silver, gold, copper), refractory metal (tungsten) and metal-semiconductor alloy under ultrashort laser pulses have been studied by means of the surface morphology analysis.The influence of the laser ablation process on the formation of nanoscale features on the laser treated surfaces has been discussed.In the experiments, the low fluence multi-pulse regime near the ablation threshold for studied materials has been realized.The average sizes of nanoscale features formed under ultrashort laser processing on the surface structures have been determined for silver, gold, copper and tungsten.Observed enhancement of Raman signal for some vibrations of Methylene Blue dye adsorbed on laser-induced Ag surface structures demonstrates the possibility of an application of the laser-textured substrates as surface enhanced Raman scattering (SERS) substrates used for biosensing.

Morphology

10.15407/mfint.41.12.1587

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Cytotoxicity of Hybrid Noble Metal-Polymer Composites

BioMed Research International (2022)

Anton Tkachenko Pavlo Virych Valeriy Myasoyedov Volodymyr Prokopіuk Anatolii Onishchenko

The aim of the present research was to assess the cytotoxicity of gold and silver nanoparticles synthesized into dextran-graft-polyacrylamide (D-PAA) polymer nanocarrier, which were used as a basis for further preparation of multicomponent nanocomposites revealed high efficacy for antitumor therapy. The evaluation of the influence of Me-polymer systems on the viability and metabolic activity of fibroblasts and eryptosis elucidating the mechanisms of the proeryptotic effects has been done in the current research. The nanocomposites investigated in this study did not reduce the survival of fibroblasts even at the highest used concentration. Our findings suggest that hybrid Ag/D-PAA composite activated eryptosis via ROS- and Ca2+-mediated pathways at the low concentration, in contrast to other studied materials. Thus, the cytotoxicity of Ag/D-PAA composite against erythrocytes was more pronounced compared with D-PAA and hybrid Au/polymer composite. Eryptosis is a more sensitive tool for assessing the biocompatibility of nanomaterials compared with fibroblast viability assays.

Nanocarriers

Biocompatibility

Viability assay

Nanomaterials

Noble metal

Silver nanoparticle

10.1155/2022/1487024

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Citations (7)

Plasmonic Nanocavity Metasurface Based on Laser-Structured Silver Surface and Silver Nanoprisms for the Enhancement of Adenosine Nucleotide Photoluminescence

ACS Applied Nano Materials (2019)

Oleg A. Yeshchenko Vladislav Yu. Kudrya Anastasiya V. Tomchuk Igor Dmitruk Nataliya Berezovska

A reliable photoluminescence (PL) spectroscopy and imaging of biomolecules at room temperature is a challenging and important problem of biophysics, biochemistry, and molecular genetics. A unique effect of strong plasmonic enhancement of the PL by metal nanostructures is one of the most effective approaches for this purpose. The highest enhancement is provided by metal nanostructures with densely packed sharp tips, periodically arranged metal nanostructures, and plasmonic cavities. All of these features have been realized in the plasmonic cavity metasurface based on the silver (Ag) laser-induced periodic surface structure and Ag triangular nanoprisms studied in the present work. The strong plasmon-enhanced PL of 5′-deoxyadenosine monophosphate deposited on such metasurfaces has been revealed at room temperature. The observed enhancement of more than 1000-fold has been interpreted as a result of synergetic action of the generation of a high concentration of hot spots near the sharp edges of the laser-induced surface structure and nanoprisms together with excitation of the collective gap mode of the cavity due to strong near-field plasmonic coupling. Correspondingly, the plasmonic cavity metasurfaces consisting of metal laser-induced periodic surface structures and nonspherical metal nanoparticles with sharp edges have been shown to be crucial for the highly sensitive detection and imaging of biomolecules at room temperature without consuming any dye labels.

Biomolecule

10.1021/acsanm.9b01673

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Citations (13)

Effect of pH of Ganoderma lucidum aqueous extract on green synthesis of silver nanoparticles

Advances in Natural Sciences Nanoscience and Nanotechnology (2023)

Oleksandr Smirnov Volodymyr Dzhagan Oleg A. Yeshchenko Mariia Kovalenko Olga Kapush

Abstract Perspective applications of Ag nanoparticles (NPs) stimulate intense research on their affordable synthesis, including green routes. The use of fungi extracts has advantages over other organisms, because of their relatively easy isolation and higher efficiency in a reduction of metal ions and NP formation. Here we report mycosynthesis of AgNPs based on Ganoderma lucidum fruit body extract with different pH values as the bioreducing and stabilising agent. Stable NPs colloids with distinct plasmonic resonance peaking at 408–418 nm are obtained by using photoreduction in a broad pH range (5 to 11). Synthesis efficiency drops only at very acidic conditions, pH = 2.5. The NP size and morphology are studied by dynamic light scattering and scanning electron microscopy. An analysis of FTIR spectra of pure analyte and NP sample indicates that stabilisation of the AgNPs by the components of Ganoderma lucidum extract may take place via forming chemical bonds with the NP surface. These bio-friendly AgNPs are both optically and chemically active, as inferred from surface-enhanced Raman scattering of a standard dye analytes and charge transfer-induced quenching of the photoluminescence of both dye and inorganic NPs, and can be studied for various applications which require direct access to the AgNP surface.

Silver nanoparticle

Surface Modification

10.1088/2043-6262/acebd4

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Citations (4)

Surface Plasmon as a Probe of Local Field Enhancement

Plasmonics (2009)

Igor Dmitruk Ivan Blonskiy Ihor Pavlov Oleg A. Yeshchenko A. A. Alexeenko

Localized surface plasmon

Local field

10.1007/s11468-009-9081-7

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Citations (14)

Plasmonic Coupling Effects in Arrays of Noble Metal Nanoparticles

Reviews in plasmonics (2019)

Oleg A. Yeshchenko Anatoliy O. Pinchuk

Noble metal

Plasmonic Nanoparticles

10.1007/978-3-030-18834-4_11

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Citations (2)

Aggregation Processes in Hybrid Nanosystem Polymer/Nanosilver/Cisplatin

Ukrainian Journal of Physics (2018)

Nataliya Kutsevol A. P. Naumenko Vasyl Chumachenko Oleg A. Yeshchenko Yu. Harahuts

Hybrid nanosystems consisting of star-like copolymer Dextran-graft-Polyacrylamide in the anionic form (D-g-PAA(PE)), silver nanoparticles (AgNPs), and cisplatin (cis-Pt) have been synthesized in water and characterized by TEM, DLS, FTIR, and UV-Vis spectroscopies. It is shown that cis-Pt forms a complex with carboxylate groups of the polymer. For the ternary system Polymer/AgNPs/cis-Pt, a change in the hydrophilic-hydrophobic balance of a polymer molecule (due to the complexation with cis-Pt) and the aggregation of macromolecules, as well as to some agglomeration AgNPs, are revealed. The decrease of the antitumor efficiency of the hybrid ternary nanosystem Polymer/AgNPs/cis-Pt in comparison with the Polymer/cis-Pt system is discussed.

Silver nanoparticle

Carboxylate

10.15407/ujpe63.6.513

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Citations (8)