Факультет електроніки та інформаційних технологій (ЕлІТ)
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Item Regularities of structure formation and physical properties of multilayered composites based on W, Ta, Нf, Ti, Mo, Сr, Al, and С(Vasyl Stefanyk Precarpathian National University, 2020) Перекрестов, Вячеслав Іванович; Перекрестов, Вячеслав Иванович; Perekrestov, Viacheslav Ivanovych; Космінська, Юлія Олександрівна; Косминская, Юлия Александровна; Kosminska, Yuliia Oleksandrivna; Gannych, Yu.V.; Корнющенко, Ганна Сергіївна; Корнющенко, Анна Сергеевна; Korniushchenko, Hanna SerhiivnaNew fabrication technique of multilayered composite coatings on inner surface of pipes is developed which is based on ion–plasma sputtering of rod–like target composed of various metals and graphite. It is established that gradient change of elemental composition in the direction Сr→W→Mo→Ta→Hf→Ti→C→Ti/Al→C is accompanied by transition from metal mixture carbide to titanium carbide with the grain sizes of ~ 8–15 nm. It is found that increase in microhardness up to ~ 26 GPa is caused by additional surface heating by thermal radiation from the ion–heated rod and by elemental composition of the composite layers.Item Regularities of Ultrathin Silver Films Formation on Cleaved KCl Facets(Sumy State University, 2015) Перекрестов, Вячеслав Іванович; Перекрестов, Вячеслав Иванович; Perekrestov, Viacheslav Ivanovych; Загайко, Інна Володимирівна; Загайко, Инна Владимировна; Zahaiko, Inna Volodymyrivna; Космінська, Юлія Олександрівна; Косминская, Юлия Александровна; Kosminska, Yuliia OleksandrivnaThe ultrathin silver layers formation regularities were studied. Silver films were obtained by DC magnetron sputtering onto KCl cleaved facets in an ultrapure inert environment. The technique of samples obtaining was based on reducing of the percolation threshold for silver condensates under Volmer-Weber nucleation conditions and exposing of a growth surface to plasma. The condensates structure was investigated by means of transmission electron microscopy. The experiments have shown that on the initial stage of film growth on cleaved KCl facets solid amorphous layer was formed. With increasing of layer thi ckness a transition to crystalline state was occurred.Item Metal and Calcium-Phosphate Nanoparticles for Biomedical Applications(Sumy State University, 2012) Суходуб, Леонід Федорович; Суходуб, Леонид Федорович; Sukhodub, Leonid Fedorovych; Перекрестов, Вячеслав Іванович; Перекрестов, Вячеслав Иванович; Perekrestov, Viacheslav Ivanovych; Корнющенко, Ганна Сергіївна; Корнющенко, Анна Сергеевна; Korniushchenko, Hanna Serhiivna; Космінська, Юлія Олександрівна; Косминская, Юлия Александровна; Kosminska, Yuliia OleksandrivnaNanoparticle research is currently an area of intense scientific research due to variety of potential applications in optics, electronics, biotechnology, health care, biomedical, chemical, and pharmaceutical fields. The physical sizes of these materials create a strong possibility for their interaction with biological systems. Biological systems themselves contain various components that have nanometer dimensions (proteins, nucleic acids, membranes), therefore nanopaticles can be useful both for in vivo and in vitro biological researches and applications. Among the metallic nanoparticles (NPs), the most important materials in nanomedicine are gold, silver, copper, iron, cobalt, nickel, platinum, magnesium, palladium and rhodium. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34813Item Selective processes that proceed during formation of aluminum layers near the phase equilibrium in a plasma–condensate system(Technical Physics, 2008) Перекрестов, Вячеслав Іванович; Перекрестов, Вячеслав Иванович; Perekrestov, Viacheslav Ivanovych; Корнющенко, Ганна Сергіївна; Корнющенко, Анна Сергеевна; Korniushchenko, Hanna Serhiivna; Космінська, Юлія Олександрівна; Косминская, Юлия Александровна; Kosminska, Yuliia OleksandrivnaThe mechanisms of pore formation in aluminum condensates produced using a radically new technological approach that is based on self-organized sputtering systems are studied. The main technological parameters of pore formation are found to be determined by the closeness to the phase equilibrium in the plasma–condensate system and by the predominant contribution of structural or field selectivity to atom-by-atom assembling of the condensate. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/4369Item Formation of nanosystems under near-equilibrium copper condensation in an ultrapure inert medium(JETP Letters, 2007) Перекрестов, Вячеслав Іванович; Перекрестов, Вячеслав Иванович; Perekrestov, Viacheslav Ivanovych; Корнющенко, Ганна Сергіївна; Корнющенко, Анна Сергеевна; Korniushchenko, Hanna Serhiivna; Космінська, Юлія Олександрівна; Косминская, Юлия Александровна; Kosminska, Yuliia OleksandrivnaMechanisms of the self-organization of nanosystems at the condensation of the extremely weak steady flows of copper vapors obtained in magnetron sputtering in an ultrapure argon are studied. It is shown that the free-energy minimization near equilibrium condensation creates prerequisites for the self-organization of statistically homogeneous layers of nanoclusters and determines the transition to the formation of nanosystems in the form of fractal networks. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/4365Item Porous Al and Cu structures as infrared signal enhancers(Functional materials, 2010) Dovbeshko, G.I.; Довбешко, Г.И.; Довбешко, Г.І.; Fesenko, O.M.; Фесенко, О.Н.; Фесенко, О.М.; Romaniuk, V.R.; Романюк, В.Р.; Романюк, В.Р.; Perekrestov, Viacheslav Ivanovych; Перекрестов, Вячеслав Иванович; Перекрестов, Вячеслав Іванович; Kosminska, Yuliia Oleksandrivna; Косминская, Юлия Александровна; Космінська, Юлія Олександрівна; Kshniakina, Svitlana Ivanivna; Кшнякина, Светлана Ивановна; Кшнякіна, Світлана ІванівнаOptical properties of porous aluminum and copper layers with adsorbed p-nitrobenzoic acid molecules (p-NBA) have been studied. There was observed the enhancement of certain molecular groups in the IR spectrum of p-NBA. The porous Cu substrates are similar to rough gold ones in the enhancement factor of COO groups in multilayered p-NBA films. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/4128Item Regularities of Al layer structure formation near phase equilibrium in plasma–condensate system(Physics of the Solid State, 2008) Perekrestov, Viacheslav Ivanovych; Перекрестов, Вячеслав Иванович; Перекрестов, Вячеслав Іванович; Korniushchenko, Hanna Serhiivna; Корнющенко, Анна Сергеевна; Корнющенко, Ганна Сергіївна; Kosminska, Yuliia Oleksandrivna; Косминская, Юлия Александровна; Космінська, Юлія ОлександрівнаA fundamentally new technological approach to creating porous metal structures on isotropic substrates during condensation of a reverse diffusion flow in a planar dc magnetron is proposed. The physical foundations of the operation of self-organized sputtering systems are analyzed. Conditions of the formation of main varieties of porous structures, such as weakly coupled micro- and nanocrystals, and three-dimensional labyrinth structures, are found using scanning electron microscopy. It is established that the main prerequisites for the formation of pores are the stationarity of the process and proximity to the phase equilibrium in the plasma–condensate system. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/4100Item Single crystal aluminum deposit formation on isotropic substrates by means of self-organized ion sputtering(Technical Physics Letters, 2006) Perekrestov, Viacheslav Ivanovych; Перекрестов, Вячеслав Иванович; Перекрестов, Вячеслав Іванович; Korniushchenko, Hanna Serhiivna; Корнющенко, Анна Сергеевна; Корнющенко, Ганна Сергіївна; Kosminska, Yuliia Oleksandrivna; Косминская, Юлия Александровна; Космінська, Юлія ОлександрівнаA substantially new technological approach is considered, which is based on the self-organized formation of aluminum single crystal layer on isotropic substrates in the course of stationary condensation of reverse diffusion fluxes in a planar dc magnetron. The functional possibilities of self-organized ion sputtering systems are discussed. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/4077