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Романов, Роман Иванович

Организационные подразделения

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Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Романов

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Роман Иванович

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Теперь показываю 1 - 10 из 20

Только метаданные
Features of Pulsed Laser Annealing of BC3 Films on a Sapphire Substrate
(2019) Zinin, P. V.; Filonenko, V. P.; Fominski, V. Y.; Romanov, R. I.; Solov'ev, A. A.; Vasil'evskii, I. S.; Safonov, D. A.; Ivanov, A. A.; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович; Соловьев, Алексей; Васильевский, Иван Сергеевич; Сафонов, Данил Андреевич; Иванов, Андрей Анатольевич
© 2019, Pleiades Publishing, Ltd.Abstract: The morphology, chemical composition, microstructure, and electrical properties of BC3 thin films subjected to melting by a nanosecond laser pulse are investigated. The original films have been created by pulsed laser codeposition of B and C onto a sapphire substrate at 150 and 350°C. Morphological changes in the films depended on their initial structural state. However, a “frozen” structure of both films after irradiation corresponded to the B-saturated graphite-like phase, the local composition of which varied due to the formation of inclusions of amorphous boron carbide. Before and after irradiation, the films exhibited a slightly decreasing dependence of the surface resistance with increasing temperature from 4.2 to 330 K. After laser irradiation, the films resistance has decreased by a factor of ~2.6.
Только метаданные
Local laser annealing of 3C-SiC film deposited on the silicon substrate by CVD
(2019) Mikhalik, M. M.; Avramchuk, A. V.; Komissarov, I. V.; Yu, Fominski, V.; Romanov, R. I.; Sultanov, A. O.; Siglovaya, N. V.; Ryndya, S. M.; Gusev, A. S.; Labunov, V. A.; Kargin, N. I.; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович; Султанов, Азрет Оюсович; Сигловая, Наталия Владимировна; Рындя, Сергей Михайлович; Гусев, Александр Сергеевич; Лабунов, Владимир; Каргин, Николай Иванович
© Published under licence by IOP Publishing Ltd. In this work, we try to suite an approach, which concerns of epitaxial graphene growth by laser irradiation of 3C-SiC (111) film deposited on silicon substrate (111) by chemical vapor deposition method. Laser treatment was performed by pulsed 1064 nm laser with 20 Hz repetition rate and 15 ns pulse duration, the fluency was varied 0-1.5 J/cm 2 . Raman spectroscopy studies show that for fluence above 0.8 J/cm 2 2D band is noticeable revealing formation of high crystallographic quality graphitic (graphene) film.
Открытый доступ
Influence of nanosecond laser irradiation on the structure and conductivity of BCx films
(2019) Zinin, P. V.; Filonenko, V. P.; Troyan, I. A.; Bulatov, K. M.; Romanov, R. I.; Fominski, V. Y.; Vasil'Evskii, I. S.; Safonov, D. A.; Fominski, D. V.; Soloviev, A. A.; Романов, Роман Иванович; Фоминский, Вячеслав Юрьевич; Васильевский, Иван Сергеевич; Сафонов, Данил Андреевич; Фоминский, Дмитрий Вячеславович; Соловьев, Алексей
© Published under licence by IOP Publishing Ltd.Thin-film precursors of BCx were formed by pulsed laser codeposition of boron and carbon. Targets made of pressed boron and carbon powders with an equal element content (B/C = 1/1) and an increased carbon content (B/C = 1/3) were used. The films were deposited on sapphire substrates at elevated temperature (700C) which determined the initial properties of the precursor BCx films. Irradiation of the films was carried out by laser pulses of nanosecond duration with varying intensity. The films obtained by laser annealing of BCx (Q-BCx) were studied by scanning electron microscopy and micro-Raman spectroscopy. Irradiation under optimal conditions made allowed to realize pulsed melting of the films and partial preservation of their continuity on the substrate. The local structure of Q-BCx films and the nature of the changes in their electrophysical properties depended on the composition of the precursor films and the laser irradiation regimes.
Открытый доступ
Formation of ultrathin MoS2 films using laser-based methods
(2019) Fominski, V. Y.; Romanov, R. I.; Nevolin, V. N.; Fominski, D. V.; Komleva, O. V.; Popov, V. V.; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович; Неволин, Владимир Николаевич; Фоминский, Дмитрий Вячеславович; Попов, Виктор Владимирович
© Published under licence by IOP Publishing Ltd.A comparative analysis of the abilities of several novel methods to produce ultrathin molybdenum disulphide (MoS2) films containing from 1 to 10 molecular layers was carried out. To deposit MoSx films and MoOx precursor films, the atomic flux was formed by laser ablation of Mo, MoS2, and MoO3 targets. Saturation with sulphur of the deposited layers was performed using a reactive gas (hydrogen sulphide) or by thermally activated treatment of thin-film precursors in a sulphur vapor. It has been established that the use of hydrogen sulphide makes it possible to obtain ultrathin MoS2 films at relatively low temperatures ∼ 350 C. However, these films contained local defects which were absent in the films prepared by the treatment of thin film MoOx precursors in sulphur vapours at higher temperatures (≥ 650C).
Открытый доступ
Selection of pulsed laser deposition conditions for preparation of perfect thin-film MoSx hydrogen evolution catalysts
(2019) Nevolin, V. N.; Fominski, D. V.; Romanov, R. I.; Esin, M. I.; Fominski, V. Y.; Kartsev, P. F.; Фоминский, Дмитрий Вячеславович; Романов, Роман Иванович; Фоминский, Вячеслав Юрьевич; Карцев, Петр Федорович
© Published under licence by IOP Publishing Ltd.The influence of pulsed laser deposition conditions in the geometry "off-axis" on the catalytic properties of MoSx films in the hydrogen evolution reaction is investigated. For the deposition of MoSx films from MoS2 target, pulsed laser radiation from the IR and UV wavelength ranges was used. The angle of incidence of the laser-induced plume on the surface of the substrate in a buffer gas was varied to check the influence of large in-size Mo-enriched particles. The efficiency of the catalyst was estimated from the results of the turnover frequency (TOF) measurement, which made it possible to minimize the influence of the "loading" of the catalyst on its characteristics. The effects of the chemical composition, local structure, and properties of the catalyst-substrate interface on the efficiency of the hydrogen evolution reaction are analysed. The regime of pulsed laser deposition of more effective thin-film MoSx catalysts is determined.
Только метаданные
Structural, electrical and mechanical properties of ВСх films prepared by pulsed laser deposition from mixed and dual boron-diamond/graphite targets
(2019) Zinin, P. V.; Bulatov, K. M.; Filonenko, V. P.; Fominski, V. Y.; Romanov, R. I.; Vasil'evskii, I. S.; Safonov, D. A.; Soloviev, A. A.; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович; Васильевский, Иван Сергеевич; Сафонов, Данил Андреевич; Соловьев, Алексей
© 2019 Elsevier B.V. Relatively low and high deposition rates of BCх films were realized by pulsed laser ablation of mixed B–diamond and dual B–graphite targets, respectively. Deposition was performed at 500 °C and the rate of film deposition was determined with respect to the number of atomic monolayers (obviously less or more than one monolayer) grown for one laser pulse. In the case of BCх films formation with a low deposition rate, doping with B facilitated the growth of the nanocomposite structure, which possessed an increased fraction of sp3 bonds, a very low electrical resistance, and an improved mechanical performance. The change of the sheet resistance of these films as the temperature was reduced from 300 to 65 K had a metallic character. For about 95-nm-thick films with bulk compositions of BC1.7 and BC0.6, the resistivity at room temperature were approximately equal to 1.5 mΩ·cm, and the lowest resistivity of 0.23 mΩ·cm was detected for B-enriched film at 85 K. With an increase in the B atom concentration in such films, the charge carrier (holes) concentration decreased, and their mobility increased from 180 to 10,500 cm2·V−1·s−1 due to samples cooling. The application of a higher deposition rate from the dual B–graphite target activated surface migration of condensed atoms, which caused the development of granular morphology, the B segregation and the reduction of the sp3 bond fraction. The hardness and electrical conductivity of such films were obviously inferior to those of the films obtained by PLD with a low deposition rate.
Открытый доступ
Preparation of Mo-S-P electrocatalytic films by pulsed laser ablation of MoS2/P composite target for effective hydrogen production
(2020) Rubinkovskaya, O. V.; Fominski, D. V.; Romanov, R. I.; Nevolin, V. N.; Fominski, V. Yu.; Рубинковская, Оксана Владимировна; Фоминский, Дмитрий Вячеславович; Романов, Роман Иванович; Неволин, Владимир Николаевич; Фоминский, Вячеслав Юрьевич
© Published under licence by IOP Publishing Ltd.The results of structural and electrochemical studies of thin Mo-S-P films obtained by pulsed laser deposition at various conditions from a target made of mixture of MoS2 and P powders are presented. For variation of S/P ratio and modification structure of the catalytic films, the deposition of the laser plume was conducted in vacuum, in Ar and H2S gas. The highest electrocatalytic properties for activating the hydrogen evolution reaction in an acid solution were found for composite amorphous/nanocrystalline MoS6P/nc-Mo films. In the chemical stateof S 2p, the high binding energy dominated. The doping of the films with phosphorus increased the efficiency of the reaction compared with that of MoS x /nc-Mo films. The analysis of the synergistic effect of phosphorus on the performance of amorphous MoS x P y films in H2 evolution was carried out using the density functional theory.
Только метаданные
Influence of the Chemical Composition and Local Atomic Packing of Nanostructured MoSx and MoSex Solid Lubricant Coatings on Their Tribological Properties under Complicated Conditions
(2020) Fominski, V. Y.; Nevolin, V. N.; Fominski, D. V.; Romanov, R. I.; Gritskevich, M. D.; Фоминский, Вячеслав Юрьевич; Неволин, Владимир Николаевич; Фоминский, Дмитрий Вячеславович; Романов, Роман Иванович; Грицкевич, Мария Дмитриевна
© 2020, Pleiades Publishing, Ltd.Abstract: We present the results of a comparative investigation of the friction and wear characteristics of MoSx and MoSex coatings in an oxidizing medium (argon–air mixture) at a temperature of –100°C. Thin films of these solid lubricants were manufactured by pulsed laser deposition using MoS2, MoSe2, and Mo targets in vacuum and H2S. It was established that S-containing coatings ensured a friction coefficient of ~0.09 and were much superior to S-containing coatings in respect of wear. The properties of MoSx coatings depended on the concentration of S that determined the local atomic packing in the amorphous structure of the film. The friction coefficient of MoS3 coating after running-in was half as small as that of MoS2 and amounted to 0.08.
Только метаданные
Features of Sliding Friction on Thin-Film Mo–S–C Coatings Prepared by Pulsed Laser Deposition
(2020) Novikov, S. M.; Chesnokov, A. V.; Fominski, V. Y.; Romanov, R. I.; Fominski, D. V.; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович; Фоминский, Дмитрий Вячеславович
© 2020, Allerton Press, Inc.Abstract: To obtain Mo–S–C thin-film coatings on steel substrates with varying structural and chemical states, pulsed laser codeposition method was used at room temperature, including the first ever use of reactive codeposition of Mo and C in H2S. The conditions are determined for obtaining sufficiently smooth layers with optimal local packing of atoms in amorphous MoSx and diamond-like carbon nanophases, which yielded relatively high wear resistance and a low sliding friction coefficient (~0.1) in air without a long running-in phase.
Только метаданные
Surface Physicochemical Treatment of Nickel Foam for Increasing Its Electrocatalytic Activity in Overall Water Splitting
(2020) Fominski, D. V.; Nevolin, V. N.; Romanov, R. I.; Fominski, V. Y.; Komleva, O. V.; Kartsev, P. F.; Novikov, S. M.; Фоминский, Дмитрий Вячеславович; Неволин, Владимир Николаевич; Романов, Роман Иванович; Фоминский, Вячеслав Юрьевич; Рубинковская, Оксана Владимировна; Карцев, Петр Федорович
© 2020, Pleiades Publishing, Ltd.Abstract: The possibility of using physicochemical methods for treating a nickel foam to increase its electrocatalytic activity in hydrogen and oxygen evolution reactions in an aqueous alkaline solution was studied. The modification of a 1-mm-thick sheet of the foam was carried out through its surface and included physical deposition of pulsed laser plasma for the formation of catalytic MoSx and MoSxSey films, followed by their annealing. The effect of foam pretreatment by sulfurization in H2S under varying conditions and formation of catalytic layers with different structures and compositions was studied. The best improvement in the electrocatalytic performance of the foam was exerted by thin-film coatings of molybdenum sulfide and sulfide/selenide with a nanocrystalline structure formed on the surface of a foam with a Ni3S2 underlayer. The possibility of a synergetic effect of the formed phases was analyzed by DFT calculations. For the optimum composition of the modified layers, the overvoltage of H2 evolution (for a current density of 10 mA/cm2) decreased to 155 mV, and the overvoltage of O2 evolution did not exceed 160 mV. The electrocatalytic characteristics obtained by this treatment are not inferior to those for the best modern electrocatalysts created on nickel foam by widely used methods of hydrothermal synthesis or electrodeposition.