2023, Bortko, D. V., Borisyuk, P. V., Shilov, V. A., Vasilyev, O. S., Lebedinskii, Y., Бортко, Диана Владимировна, Борисюк, Петр Викторович, Шилов, Владимир Александрович, Васильев, Олег Станиславович, Лебединский, Юрий Юрьевич

2020, Karpov, G. A., Yarotskaya, L. V., Borisyuk, P. V., Vasilyev, O. S., Efimov, V. G., Lebedinsky, Y. Y., Chubunova, E. V., Борисюк, Петр Викторович, Васильев, Олег Станиславович, Лебединский, Юрий Юрьевич, Чубунова, Елена Витальевна

© 2020, Pleiades Publishing, Ltd.Abstract: The results of a study of the local formation of thorium oxide-based coatings on the SiO2/Si (111) surface during electrochemical deposition are presented. It was experimentally found that as a result of electrochemical deposition of thorium atoms from an acetone solution of Th(NO3)4 with the presence of water on the silicon surface, local formation of thorium compounds occurs. The results of the analysis of the chemical composition of the surface by the method of local XPS analysis show that these compounds are those based on thorium, silicon, oxygen, and carbon. After annealing for 6 h at 600°C in atmosphere, carbon completely disappears, and the formed cluster film seemingly consists only of thorium and oxygen. It is shown that this system is promising for future research on nuclear low-lying isomeric transition in the 229Th isotope under electron beam irradiation.

2020, Lebedinskii, Y. Y., Borisyuk, P. V., Chubunova, E. V., Kolachevsky, N. N., Vasiliev, O. S., Tkalya, E. V., Лебединский, Юрий Юрьевич, Борисюк, Петр Викторович, Чубунова, Елена Витальевна, Васильев, Олег Станиславович, Ткаля, Евгений Викторович

© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimCurrently, an urgent task related to creating a nuclear frequency standard is the identification of a low-lying nuclear state in the thorium-229 isotope. Herein, a method for measuring the single-photon energy during the decay of an isomeric thorium-229 nucleus implanted in a wide-gap dielectric SiO2 (Eg = 9 eV) is developed. The proposed method utilizes thin silicon oxide layers obtained by thermal oxidization of the pure silica wafers, which allows measurement of the energy of photons in the ultraviolet (UV) range using an electronic spectrometer. The modeling study of electronic state excitation is provided via UV radiation from Kr, Xe, and D resonance discharging lamps. The obtained spectra are analyzed, and a method for determining the UV photon's energy is proposed.

2024, Bortko, D. V., Balakhnev, K. M., Shilov, V. A., Borisyuk, P. V., Vasilyev, O. S., Lebedinskii, Y. Y., Бортко, Диана Владимировна, Балахнёв, Кирилл Максимович, Шилов, Владимир Александрович, Борисюк, Петр Викторович, Васильев, Олег Станиславович, Лебединский, Юрий Юрьевич

2017, Васильев, О. С., Борисюк, П. В., Козлова, Т. И., Лебединский, Ю. Ю., Борисюк, Петр Викторович, Лебединский, Юрий Юрьевич, Козлова, Татьяна Ивановна, Васильев, Олег Станиславович

The results of the study of electron properties evolution of monodisperse thin films consisted of Ta and Mo metal nanoclusters deposited onto the SiO2/Si(001) surface with magnetron sputtering method are presented. The changes in chemical composition and electron structure of the samples were controlled by means of X-ray photoelectron spectroscopy in the UHV analysis chamber of the Multiprobe MXPS RM VT AFM-25 surface analysis system. Susceptibility to oxidation after exposure to atmosphere was studied.

2021, Borisyuk, P. V., Vasilyev, O. S., Lebedinskii, Y. Y., Bortko, D. V., Karazhanov, S., Борисюк, Петр Викторович, Васильев, Олег Станиславович, Лебединский, Юрий Юрьевич, Бортко, Диана Владимировна, Каражанов, Смагул Жангабергенович

© 2020 Elsevier B.V.The paper presents the research of thin films, consisting of spherical monodisperse Ta particles. For different samples particle sizes varied from 1.3 nm to 5.8 nm. The films were also exposed to the atmosphere for oxidation, which resulted in formation of a core-shell particle structure, where core was metal and shell was Ta oxide (Ta2O5). Dependency of bandgap Egap and valence band offset (VBO) on particle size has been investigated for the structure by using the X-ray photoelectron spectroscopy (XPS) and reflected electron energy loss spectroscopy (REELS) methods. We have found, that Egap decreases from 4.72 eV to 4.47 eV whereas VBO decreases from 3.50 eV to 2.95 eV with increasing the particle size. A new method of a fine regulation of the electronic structure is suggested, particularly for the application in ultraviolet (UV) photodetector design for low-lying nuclear and electron transitions detection.

2020, Vasilyev, O. S., Borisyuk, P. V., Lebedinskii, Y. Y., Васильев, Олег Станиславович, Борисюк, Петр Викторович, Лебединский, Юрий Юрьевич

© 2020, Pleiades Publishing, Ltd.Abstract: Results of a study of the electronic structure and optical properties of a novel material based on thin films comprised of Mo nanoclusters obtained by gas-phase magnetron sputtering are presented. The chemical composition of the obtained films immediately after deposition (in situ) and upon exposure to the atmosphere (ex situ) was investigated by X-ray photoelectron spectroscopy. It is shown that exposure to the atmosphere leads to “core–shell” oxidation of the nanoclusters the obtained films are composed of and changes in the valence band. The change in the electronic structure of the obtained films was investigated by spectro-scopy of the characteristic energy losses of electrons. The optical properties of the obtained films were investigated in the wavelength range of 185–800 nm. The possibility of creating thin-film photodetectors based on the obtained Mo nanocluster films for detecting isomeric nuclear transition decay in 229Th nuclei is discussed.

2025, БОРТКО, Д. В., БОРИСЮК, П. В., ВАСИЛЬЕВ, О. С., ШИЛОВ, В. А., Васильев, Олег Станиславович, Борисюк, Петр Викторович, Шилов, Валентин Александрович, Бортко, Диана Владимировна

Проведены эксперименты по измерению пропускания излучения широкого ИК диапазона тонких плёнок (от 26 до 48 нм) из наночастиц тантала различного размера (от 1.5 до 7.5 нм), напылённых на кремниевую подложку методом магнетронного распыления мишени с последующим захоронением наночастиц под тонким слоем CaF2. Измерения проводились с помощью двух спектрометров, общий рабочий диапазон которых составляет от 500 до 2600 нм. Получены спектральные коэффициенты пропускания нанокластерных плёнок в диапазоне от 1000 до 2500 нм для разных размеров кластеров тантала.

2024, Шилов, В. А., Бортко, Д. В., Балахнёв, К. М., Борисюк, П. В., Васильев, О. С., Васильев, Олег Станиславович, Бортко, Диана Владимировна, Шилов, Валентин Александрович, Борисюк, Петр Викторович, Балахнёв, Кирилл Максимович

Получены core-shell образцы тонких плёнок нанокластеров тантала и оксидов тантала на кремнии. По результатам рентгеновского фотоэлектронного спектроскопического анализа определён химический состав нанокластеров Ta/TaO2. По характеру угловых зависимостей соотношений пиков дублета Ta4f и кислорода была установлена однородность состава тонкой нанокластерной плёнки. Для нанокластеров металлического тантала диаметром менее 5 нм наблюдался эффект размерного сдвига энергии связи и была установлена его зависимость от диаметра нанокластеров.

2020, Borisyuk, P. V., Chubunova, E. V., Lebedinskii, Y. Y., Vasilyev, O. S., Yakovlev, V. P., Борисюк, Петр Викторович, Чубунова, Елена Витальевна, Лебединский, Юрий Юрьевич, Васильев, Олег Станиславович, Яковлев, Валерий Петрович

© 2020, Pleiades Publishing, Ltd.Abstract: A method for excitation of thorium-229 isomeric nuclei the electron beam irradiation of a solid-state target based on thorium silicate is considered. The key point for obtaining an effective yield of isomeric nuclei is the generation of secondary electrons with a significant increase in the multiplication factor for electrons that have energies within a range from 1 to 25 keV. Based on numerical simulation and theoretical estimation of the excitation cross section of isomeric transition in inelastic scattering, the yield function of isomeric nuclei was o qualitatively obtained.