排序方式: 共有41条查询结果,搜索用时 15 毫秒
1.
A. P. Bakhtinov V. B. Boledzyuk Z. D. Kovalyuk Z. R. Kudrynskyi O. S. Lytvyn A. D. Shevchenko 《Physics of the Solid State》2013,55(6):1148-1155
The magnetic properties of layered Co x In2Se3 crystals electrochemically intercalated with cobalt in an external magnetic field and without a magnetic field and the morphology of the van der Waals surfaces of layers of these crystals have been investigated. It has been found that the ferromagnetic ordering at room temperature is observed only for Co x In2Se3 crystals intercalated in an external magnetic field. These crystals are nanocomposite materials that consist of a layered matrix and arrays of nanorings and nanowires formed from Co nanocrystals on the van der Waals surfaces of the In2Se3 layers. Cobalt nanocrystals in Co x In2Se3 crystals have a pyramidal equilibrium shape, which is characteristic of the face-centered cubic crystal structure, and their geometrical sizes are of the order of a few nanometers. The specific features of self-organization of cobalt magnetic nanostructures on the van der Waals surfaces of layered semiconductor crystals during their electrolytic intercalation in a magnetic field and the magnetic properties of these structures have been considered. 相似文献
2.
A.I. Klimovskaya O.E. Raichev A.A. Dadykin Yu.M. Litvin P.M. Lytvyn I.V. Prokopenko T.I. Kamins S. Sharma Yu. Moklyak 《Physica E: Low-dimensional Systems and Nanostructures》2007,37(1-2):212
Dense ensembles of silicon nanowires were prepared by metal-catalyzed chemical vapor deposition on silicon substrates. Some of these ensembles were doped with phosphorous during growth. The nanowires were characterized using scanning electron microscopy, X-ray diffraction, and mass spectroscopy. Field emission of electrons from these structures was studied at room temperatures in ultra-high vacuum. The measurements were carried out using a parallel-plate diode cell. At high-applied fields, the current–voltage characteristics deviate from the Fowler–Nordheim law and exhibit a step-wise increase in the current with the increasing voltage at 300 K. Possible mechanisms of the observed quantized field emission are discussed. 相似文献
3.
M. V. Sosnova N. L. Dmitruk A. V. Korovin S. V. Mamykin V. I. Mynko O. S. Lytvyn 《Applied physics. B, Lasers and optics》2010,99(3):493-497
Optical properties of a one-dimensional periodic array of subwavelength metal nanowires in the regime of local plasmon excitation are investigated experimentally and theoretically. Both gas and liquid sensing by one-dimensional gold nanowires on a glass substrate produced by holographic lithography are demonstrated experimentally. The obtained spectral sensitivity of a local plasmon sensor to the refractive index of the environment is found comparable to that of a surface plasmon polariton sensor based on the grating coupler effect. The influence of nanowire shape on spectral sensitivity is studied theoretically in a differential formalism framework using a curvilinear coordinate transformation for triangular, trapezoidal, and rectangular cross sections of the nanowires. For nanowires with trapezoidal cross section, theoretical calculations for the spectral sensitivity to variation of the refractive index of the environment agree well with experimental data. 相似文献
4.
A. A. Dadykin A. G. Naumovets Yu. N. Kozyrev M. Yu. Rubezhanska P. M. Lytvyn Yu. M. Litvin 《Progress in Surface Science》2003,74(1-8):305-318
Monolayer and multilayer Ge nanocluster structures were prepared on Si(1 0 0) using molecular beam epitaxy. The cluster size was 10 nm and cluster density was 1010 cm−2. A stable field electron emission was obtained from these structures, showing current peaks in the current–voltage characteristics, which may be attributed to the resonant electron tunneling via the energy levels of the nanocluster potential well. For cluster multilayers, the current–voltage curves also showed current peaks with a complex shape. The cluster multilayer structures had a considerable temperature sensitivity, as well as photosensitivity, in the wavelength range from 0.4 to 10 μm. 相似文献
5.
O. V. Yelenich R. Z. Lytvyn O. V. Skrypska Kh. Ye. Pitkovych A. D. Kachkovskii M. D. Obushak P. I. Yagodinets 《Russian Journal of General Chemistry》2016,86(8):1838-1844
The reaction of 3-(4-bromoacetylphenyl)-1-methylquinolin-2(1Н)-one with pyridine and 4-methylpyridine has afforded the corresponding pyridinium salts. Condensation of 4-methyl-1-{2-[4-(1-methyl-2-oxo-1,2-dihydroquinolin-3-yl)phenyl]-2-oxoethyl}pyridinium bromide with 4-dimethylaminobenzaldehyde has given a new biscyanine dye, 1-{1-[4-(1,2-dihydro-1-methyl-2-oxo-3-quinolinyl)benzoyl]-2-[4-(dimethylamino)-phenyl]ethynyl}-4-{2-[4-(dimethylamino)phenyl]ethynyl}pyridinium bromide. Its electronic spectrum has been analyzed, and quantum-chemical simulation of spatial and electronic structure of its possible isomers has been performed. 相似文献
6.
Yagodinets P. I. Rusnak O. V. Lytvyn R. Z. Skrypska O. V. Pitkovych Kh. Ye. Obushak M. D. 《Russian Journal of Organic Chemistry》2019,55(8):1145-1152
Russian Journal of Organic Chemistry - 4-(4-Acetylphenyl)-3-hydroxy-2H-chromen-2-one has been prepared by the reaction of (4-acetylbenzene)diazonium chloride with 3-hydroxy-2H-chromen-2-one under... 相似文献
7.
P. P. Moskvin V. B. Kryzhanivskyy L. V. Rashkovetskyi P. M. Lytvyn M. V. Vuichyk 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2014,88(8):1375-1381
Multifractal (MF) analysis of space forms on the surfaces of thin layers of Zn x Cd1 ? x Te solid solution precipitated onto a Si(111) substrate via the hot wall approach is performed. AFM images of film surfaces are used for MF analysis. The parameters of MF spectra are determined for the film surfaces of the above system. It is shown that the MF functions of system correspond to their canonical forms, and the resulting computational procedure can be applied to describe and analyze the state of spatial fractal structures that form on a layer’s surface. The quantitative relationships between the parameters of the MF spectrum of a film’s surface and its conditions of precipitation are revealed. 相似文献
8.
The reaction of 2-thiophenecarbaldehyde with arene diazonium chlorides in the presence of CuCl2 catalyst gave 5-aryl-2-thiophenecarbaldehydes. Use of 4-nitrobenzene diazonium chloride in the reaction also gave the isomeric
3-(4-nitrophenyl)-2-thiophenecarbaldehyde. Condensation products of the 5-aryl-2-thiophenecarbaldehydes with cyanoacetic acid
esters, cyanoacetamide, and with barbituric and dimethylbarbituric acids were prepared.
Communication 16 in the series “Synthesis of heterocycles based on the products of arylation of unsaturated compounds”. For
Communication 15 see [1].
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1166–1171, August, 2008. 相似文献
9.
Skrypska O. V. Lytvyn R. Z. Rusnak O. V. Melnyk D. O. Pitkovych Kh. Ye. Yagodinets P. I. Obushak M. D. 《Russian Journal of General Chemistry》2020,90(4):602-609
Russian Journal of General Chemistry - 4-[4-(2-Bromoacetyl)phenyl]-3-hydroxy-2H-chromen-2-one reacted with pyridine and 4-methylpyridine to give the corresponding quaternary pyridinium salts. The... 相似文献
10.
E. Shembel R. Apostolova V. Nagirny I. Kirsanova Ph. Grebenkin P. Lytvyn 《Journal of Solid State Electrochemistry》2005,9(2):96-105
Nonstoichiometric molybdenum oxides (e-MoxOy) were synthesized by cathodic reduction of aqueous ammonium and sodium molybdate solutions. Surface morphology of electrolytic (e) deposits, the chemical composition, crystal lattice structure, and the characteristics of electrochemical Li+ intercalation for such synthesized oxides were determined by the cation composition of molybdate solution and the conditions of deposit annealing. The electrochemical intercalation of Li+ ions in these Mo-oxides was investigated in thin-layer ballast-free electrodes, as a pasted mposite cathode in lithium batteries, and as an anode in lithium-ion batteries, with liquid organic and polymer electrolytes. The reversible discharge capacity of e-Mo4O11 synthesized from ammonium molybdate electrolyte in thin-layer ballast-free electrodes can exceed 225 mAh g–1 for more than 170 cycles. 相似文献