Boris Snopok

National Academy of Sciences of Ukraine | ISP · V. E. Lashkaryov Institute of Semiconductor Physics

The nanosized composites based on the natural polysaccharides and nanoparticles of noble metals are promising candidates for efficient antiviral drugs. However, the complexity of such objects, their diversity and novelty necessitate the development of new analytical methods for investigation of such supramolecular architectures. In this work, which...

The development of composite materials based on copper and zinc oxides is one of the main trends in low-temperature catalysis, sensor technology, and optoelectronics. Of particular interest are thin-film coatings where outer faces of the ZnO crystals decorated with clusters of copper oxides of different valence, the sharing of electronic processes...

Modern bio-chemical sensors rely on functional interfacial architectures with well-defined structural nano-motifs over a physical transducer. Gold-coated interfaces are of particular interest for their desirable chemical (functionalization) and optical (plasmonic) properties. Here we investigate the cleaning and polishing of polycrystalline gold fi...

Пристрій виявлення аероіонів, що містить чутливий елемент, який складається з двох, розташованих паралельно одна до одної, пластин з проміжком між ними, перша пластина чутливого елемента є п'єзоелектричною, на її внутрішній поверхні розташований зустрічно-штировий перетворювач, підключений до виходу генератора електричних коливань, а між пластинами...

Nanomaterials (NM) are rapidly finding a wider application in modern technological products due to their unique properties associated with their small dimension. Accurate detection of nano-scale materials by fast and precise analytical techniques is essential in order to control their safety and security. However, analyzing nanoscale analytes remai...

The interaction of electromagnetic radiation with ordered and disordered arrays of noble metal nanoparticles, leading to the excitation of various modes of surface plasmon states in them, is analyzed. The dipole localized surface plasmon resonance in isolated nanoparticles and the influence of various size effects on its optical response are consid...

19.1 Introduction 19.2 Biosensing Concept in Analytical Science 19.3 Physics of SPR Excitation of SPP • Utilizing the SPR Phenomena in Sensors • Simple Model of an SPR Sensor with a Linear Standard Curve • Technology Overview 19.4 Interfacial Design Sensing Architectures for Transducer-Based Systems: General Requirements • PT of SPR Sensors: Optim...

The interaction between plasmonic nanoparticles (PNPs) is of the utmost importance for the optimal design of surface enhanced Raman spectroscopy (SERS) substrates. This interaction can either quench or enhance the strength of the localized plasmon resonance of nanoparticles depending on the size of the PNPs themselves, the pores between them, their...

Complex loadings that appear on a surface with flexible spatial organisation can reveal anti-Sauerbrey behaviour due to their variable interfacial architecture even for an ultrathin monomolecular sensitive layer. Presented results demonstrate that compounds with branched and flexible structure may be organised in various spatial architectures with...

The aggregation process on the cell membranes is ones of the sources of many disorders like Alzheimer's disease where Amyloid-beta aggregation induce a significant stiffness increase during the structure change from oligomer to fibrils. Typical molecular dynamics approaches are mainly aimed at analyzing the features of the molecular structure and u...

Nanostructures of group IV semiconductors such as Ge and Si are being actively studied because of their potential application in silicon technology compatible photonics, optoelectronics, electronics, sensors etc. Electron confinement effect (ECE) is more easy observe in Ge compared to Si because of Ge greater excitonic Bohr radius - approximately 2...

Surface-enhanced Raman scattering (SERS) is powerful analytical method for applications in fundamental and applied research. One of the most active field in SERS research relates to the quest for new substrates with improved enhancement efficiency and reproducibility. These efforts include several approaches, such as development of new nanomaterial...

The porous gold nanoparticle (Au NP) arrays by Pulsed Laser Deposition (PLD) from the gold target onto substrates placed along the target plane have been formed. These arrays were formed by means of both the direct and back particle erosion torch flow. The gold target was irradiated with emission of YAG:Nd3+ laser (λ = 1.06 μm, Еp = 0.2 J, tp= 10 n...

The porous gold nanoparticle (Au NP) arrays by Pulsed Laser Deposition (PLD) from the gold target onto substrates placed along the target plane have been formed. These arrays were formed by means of both the direct and back particle erosion torch flow. The gold target was irradiated with emission of YAG:Nd3+ laser (λ = 1.06 μm, Еp = 0.2 J, tp= 10 n...

Porous films with gold nanoparticles (Au NPs) array were formed by deposition of the Au NPs from the back low-energy flux of erosion torch particles on the substrate placed at the target plain using Pulsed Laser Deposition (PLD). Under certain specified conditions the NPs of large sizes chiefly were deposited on the film regions fixed near the torc...

Laponite(Lap) is synthetic clay with platelet particles (a thickness of 1 nm and a diameter of 25 nm) with wide applications in chemical engineering, medicine and cosmetics. An important feature of Lap particles is ability to induce the formation of "empty liquid" structures. The evolution of fresh suspensions of Lap from liquid to gel-like state...

Stimuli-responsive materials get a lot of interest during last years due to their ability to tune their structure and functional properties in response to the external stimuli. Special attention should be paid to bioarchitectures which can be applied in biosensing, medicine, environmental monitoring, bioelectronics. However for the analysis and pre...

Tunable biointerfaces based on the stimuli-responsive materials became more and more popular during last decade because of needs for more and more sophisticated materials for biosensing, bioelectronics, environmental monitoring, biomedicine etc. On the other hand, such type of systems need special methods for their analysis and behavior prediction....

ISSN 0233-7577. This paper considers various aspects and directions related to development of original chemical methods for deposition of semiconductor films, as well as the CVD method for producing films from dithiocarbamate. This method was first developed at the Institute of Semiconductor Physics, National Academy of Sciences of Ukraine. The dis...

Mixed nanocomposites combined both organic and inorganic compounds extend our capabilities to form nanostructured architectures of advanced functionality. Such architectures can be used in sensors and systems of medical diagnostics, environmental monitoring etc. Here we describe the synthesis and characterization of gold nanoparticles under differe...

It was shown that acoustic sensors based on a quartz crystal microbalance with thin films of dibenzotetraazaannulene, a series of its peripherally-substituted derivatives, and metal complexes can be used to determine the HCl content of the gas-phase. It was established that the process is irreversible. Specific features of the kinetics of the respo...

Multicomponent biochemical environments (MBE) of various composition and aggregate state are an integral part of the world around us (living organisms, ponds, atmosphere, products of the food and pharmaceutical industry, etc.). Therefore, the possibility of identifying (i) individual target components in MBE (including potentially dangerous ones);...

Flower-shaped gold nanoparticles: synthesis, characterization by surface enhanced infrared absorption spectroscopy (SEIRA) and their application as potent antivirus nanocarriers

Реферат: Пристрій газового аналізу містить чутливий елемент, що складається з двох, розташованих паралельно одна одній, пластин з проміжком між ними, перша пластина чутливого елемента є п'єзоелектричною, на її внутрішній поверхні розташований вхідний зустрічно-штировий перетворювач, а між пластинами встановлені вхідний і вихідний порти, пристрій та...

Processes running in the gas phase near a solid surface have been analyzed in the framework of nonequilibrium dynamics and by simulating the irreversible monomolecular isotropic adsorption. Their infuence on the adsorption kinetics is analyzed. A complicated spatial organization of particles in the near-surface layer, where the particle concentrati...

(English version https://link.springer.com/article/10.1007/s11237-017-9496-8) The kinetic curves and monolayer clusters on a flat surface for cooperative adsorption, where the probability of sticking of the particles depends on the amount of neighbors on the surface, were calculated by nonequilibrium molecular dynamics. It was found that the type o...

A technique of the surface plasmon resonance was used to test self-organization in aqueous suspensions of laponite platelets near the gold surface. The laponite concentrations in water covered the range C = 1–4 wt %. The kinetics of electrophoretic mobility changes during aging of laponite suspensions was also measured. Formation of equilibrium str...

Within the concept of object-oriented modeling evolution of complex statistical ensembles, the features of formation dynamics and spatial self-organization of 2D-dimensional structures on a solid surface for different modes of irreversible anisotropic monolayer adsorption have been considered. The algorithm taking into account the dependences of pr...

Sol-gel technology for production of red-emitting phosphors based on SrTiO3:Pr3+ has been developed. Photo- and cathodoluminescence emission of samples with different contents of the activator Pr3+ were investigated. It has been ascertained that the maximum value of brightness of luminescence can be achieved under the optimal concentration of Pr3+...

This study reports the operation principles for reusable SPR biosensors utilizing nanoscale-specific electrostatic levitation phenomena in their sensitive layer design. Functional macromolecular building blocks localized near the “charged” surface by a variety of weak electrostatic interactions create a flexible and structurally variable architectu...

Proceedings of the Ukrainian-Polish Conference “The problems of air pollution and purification: control, monitoring, catalytic, photocatalytic and sorption methods of treatment”, November 6 - 8, 2016, Kyiv, Ukraine. ISBN 978-617-7373-84-0

Proceedings of the Ukrainian-Polish Conference “The problems of air pollution and purification: control, monitoring, catalytic, photocatalytic and sorption methods of treatment”, November 6 - 8, 2016, Kyiv, Ukraine. ISBN 978-617-7373-84-0. P.97-98.

Proceedings of the Ukrainian-Polish Conference “The problems of air pollution and purification: control, monitoring, catalytic, photocatalytic and sorption methods of treatment”, November 6 - 8, 2016, Kyiv, Ukraine. ISBN 978-617-7373-84-0

Proceedings of the Ukrainian-Polish Conference “The problems of air pollution and purification: control, monitoring, catalytic, photocatalytic and sorption methods of treatment”, November 6 - 8, 2016, Kyiv, Ukraine. ISBN 978-617-7373-84-0

Proceedings of the Ukrainian-Polish Conference “The problems of air pollution and purification: control, monitoring, catalytic, photocatalytic and sorption methods of treatment”, November 6 - 8, 2016, Kyiv, Ukraine. ISBN 978-617-7373-84-0

Proceedings of the Ukrainian-Polish Conference “The problems of air pollution and purification: control, monitoring, catalytic, photocatalytic and sorption methods of treatment”, November 6 - 8, 2016, Kyiv, Ukraine. ISBN 978-617-7373-84-0

We report the results of the comprehensive study of the structural, magnetic and optical properties of SrTiO3 perovskite doped with Eu3+ ions. Polycrystalline powders were obtained by sol-gel process including high-temperature annealing at 1300 °C. The structural analysis showed that material is composed of several phases with dominant SrТiO3 and c...

Recent advances in the sample handling techniques as part of analytical workflow of analysis with electronic nose systems are reviewed. Classic approaches of headspace analysis as well as advanced methods of sample enrichment and dynamic separation are considered and summarized. The efficiency of application of different sampling methods for specif...

Досліджено основоположні фізичні закономірності перебігу процесів на межі розділу багатокомпонентне хімічне середовище – неоднорідна поверхня (БХС-НП) та розроблено спосіб їх формалізації у формі, придатній для практичної реалізації концепції динамічних методів аналізу (КДМА) БХС з використанням біохімічних сенсорних систем (БСС) поверхневого типу....

A method for express detecting of the presence of thiocyanate in fluids comprises mixing of an aqueous solution of the test sample with an aqueous solution of the indicator, then it is determined the concentration of thiocyanate of resulting mixture by analyzing. As an indicator the gold nanoparticles are used, and the presence of thiocyanate is de...

Earlier we established that CTDSPL gene encoding small carboxy-terminal domain serine phosphatase can be considered a classical tumor suppressor gene. Besides, transfection of tumor cell line MCF-7 with CTDSPL led to the content decrease of inactive phosphorylated form of another tumor suppressor, retinoblastoma protein (Rb), and subsequently to ce...

Earlier we established that CTDSPL gene encoding small carboxy-terminal domain serine phosphatase can be considered a classical tumor suppressor gene. Besides, transfection of tumor cell line MCF-7 with CTDSPL led to the content decrease of inactive phosphorylated form of another tumor suppressor, retinoblastoma protein (Rb), and subsequently to ce...

Analytical approaches based on surface plasmon resonance (SPR) phenomena provide biosensor methods suitable for a wide range of both fundamental and practical applications. In addition to the qualitative direct detection techniques, the SPR systems can be also applied to the development of quantitative assays in a competitive mode, that open the wa...

(English version http://link.springer.com/article/10.1007/s11237-015-9412-z) The adsorption of water vapor on the Si(100) surface was found to proceed with formation of a charged form of an adsorption complex using the transverse acoustoelectric effect in the layered piezodielectric/air-gap/semiconductor structure. The sign of the localized surface...

An ultrahigh-sensitive gas phase biosensor/tracer/bio-sniffer is an emerging technology platform designed to provide real-time information on the air-borne analyts or ones in liquids through classical headspace analysis. The desired bio-sniffer measures gaseous 17ά – ethynylestradiol (ETED) as frequency change of quartz crystal microbalance (QCM),...

Сжато изложены результаты исследований и разработок, выполненных институтами НАН Украины в рамках Государственной целевой научно­технической программы «Нанотехнологии и наноматериалы» (2010–2014). 115 разделов монографии сгруппированы в шесть тематических глав: физика наноструктур, технологии полупроводниковых наноструктур, диагностика на­нострукту...

Сжато изложены результаты исследований и разработок, выполненных институтами НАН Украины в рамках Государственной целевой научно­технической программы «Нанотехнологии и наноматериалы» (2010–2014). 115 разделов монографии сгруппированы в шесть тематических глав: физика наноструктур, технологии полупроводниковых наноструктур, диагностика на­нострукту...

Сжато изложены результаты исследований и разработок, выполненных институтами НАН Украины в рамках Государственной целевой научно­технической программы «Нанотехнологии и наноматериалы» (2010–2014). 115 разделов монографии сгруппированы в шесть тематических глав: физика наноструктур, технологии полупроводниковых наноструктур, диагностика на­нострукту...

Advanced combination of gas chromatography (GC) with electronic nose (EN) concept open the way for advanced chemical imaging of complex chemical mediums with direct identification of their components. It was successfully demonstrated that GC-EN has preferences in comparing with conventional GC method as well as with analysis with use EN by itself,...

https://www.youtube.com/watch?v=C64ANA3CEHA beginning at 25.5 min

video presentation at the https://www.youtube.com/watch?v=ktHPu6k-V9w beginning at 23 min

(English version at http://link.springer.com/article/10.1007/s11237-014-9351-0, Russian version see below in the publication list) On the basis of current trends in the description of adsorption processes in complex media a conceptual analysis was made of the mechanisms of the appearance of nonexponential kinetics (stretched exponential function) i...

A method for utilization of nano-particles of silver from water solution at concentrations of millimolar range includes removal of those from the reaction mix through formation of aggregates at room temperature. Removal is carried out through formation of aggregates with molecules of glutathione, mixing silver nano-particles with concentration 5-10...

(English version http://link.springer.com/article/10.1007/s11237-014-9344-z) The sol–gel method was used to obtain high-brightness crystal phosphors from SrTiO3: Pr3+ producing more than 1800 cd/m2. A ten-fold increase in the intensity of the main luminescence spectrum band at λ = 617 nm by doping SrTiO3: Pr3+ was achieved by adding a ferric ion co...

(English version at https://www.researchgate.net/publication/263392537_Nonexponential_Kinetics_of_Surface_Chemical_Reactions or http://link.springer.com/article/10.1007/s11237-014-9351-0) На основе анализа современных тенденций в описании адсорбционных процессов в сложных средах проведено концептуальное рассмотрение механизмов возникновения неэкспо...

(English version http://link.springer.com/article/10.1134/S1063784214010071) Zinc sulfide and zinc oxide films are produced by the pyrolysis of organometallic compounds (MOCVD technique). The objects of investigation are the phase composition, structure, surface topology, and the optical and piezoelectric properties of the films obtained under diff...

Пленки сульфида и оксида цинка получены пиролизом металлоорганических соединений. Исследованы фазовый состав, структура, топография поверхности, оптические и пьезоэлектрические свойства пленок, полученных в различных технологических условиях. Состав пленок зависит от степени очистки прекурсора, температуры подложки (при увеличении изменяется от ZnS...

It is found that glucuronoxylomannan (GXM) obtained from basidiomycetes Tremella mesenterica Ritz. Fr. (Basidiomycota) culture liquid inhibits the infectivity of tobacco mosaic virus (TMV). Virus inactivation is invertible, since it reduces after inoculum containing GXM is diluted. By the method of surface plasmon resonance, it has been shown that...

Single living Chinese hamster ovary cells on the surface of different substrates have been characterized in-vivo by confocal scanning Raman spectroscopy and conventional optical microscopy. It was shown that both morphology and vibration fingerprint of cells depend on the nature of the substrate material (glass, silicon, bismuth germinate, quartz,...

Direct detection of biological transformations of single living cells in vivo has been performed by the advanced combination of local topographic imaging by Atomic Force Microscopy (AFM) and label-free sub-surface chemical characterization using new μ-Tip-Enhanced Raman Spectroscopy (μ-TERS). The enhancing mechanism for μ-TERS tips with micrometre...