SSI Institute for Single Crystals of NAS of Ukraine

Kharkiv, Ukraine

SSI Institute for Single Crystals of NAS of Ukraine

Kharkiv, Ukraine
SEARCH FILTERS
Time filter
Source Type

Sofronov D.S.,SSI Institute for Single Crystals of NAS of Ukraine | Vaksler E.A.,University of Kharkiv | Mateychenko P.V.,Institute for Single Crystals of NAS of Ukraine | Sofronova O.M.,SSI Institute for Single Crystals of NAS of Ukraine | And 3 more authors.
Journal of Nano- and Electronic Physics | Year: 2017

The preparation of ZnSe films with sphalerite structure by electrochemical method in alkaline electrolyte (1-3 M NaOH solution, 0.5M Se) during selenization of zinc layer was described in this paper. Films formed agglomerated spherical particles with size of 0.5 - 1.5 μm. The size of aglomerate decreases with increase of current density and time of selenization. Increase of NaOH concentration in the electrolyte leads to loss of continuity in the film by increasing their size. By varying the concentration of NaOH, selenization time and the current density it is possible to obtain the film of thickness 10.5 μm. The resulting ZnSe films have p-type of conductivity and resistivity 105 - 106 Ohm·m. © 2017 Sumy State University.


Nasieka I.,Institute of Semiconductor Physics of Ukraine | Boyko M.,Institute of Semiconductor Physics of Ukraine | Strelchuk V.,Institute of Semiconductor Physics of Ukraine | Kovalenko N.,Institute for Single Crystals of NAS of Ukraine | And 5 more authors.
Optical Materials | Year: 2014

The effect of Er-doping of ZnSe crystals on luminescence and structural properties was investigated using low-temperature photoluminescence, X-ray luminescence, Raman and IR spectroscopies. It was found that Er dopant atoms with the concentration in the solid phase of about 10-3 wt.% lead to a substantial disordering of initial crystalline structure. The mentioned processes manifest in substantial decrease of the amplitudes of corresponding vibrational modes and increase of their FWHM in first-order Raman spectra of Er-doped ZnSe crystals. Also, Er-doping stimulates an appearance of additional absorbance bands in IR transmittance spectra. However, Er-doping leads to substantial increase of the efficiency of photoluminescence and X-ray luminescence that is very important for scintillation application. In this case, the luminescence is mainly caused by recombination via defect centers which contain Er atoms incorporated in the ZnSe lattice in different electronic configurations. © 2014 Elsevier B.V. All rights reserved.


Nechayev M.A.,National University of Pharmacy | Nechayev M.A.,Enamine Ltd. | Gorobets N.Y.,SSI Institute for Single Crystals of NAS of Ukraine | Kovalenko S.M.,National University of Pharmacy | Tolmachev A.A.,Enamine Ltd.
Synthesis (Germany) | Year: 2013

An efficient synthesis of 1-methyl-4,5,6,7-tetrahydro-1H-pyrrolo[2,3-c] pyridine hydrochloride was achieved using simple sodium borohydride reduction of 6-benzyl-1-methyl-1H-pyrrolo[2,3-c]pyridin-6-ium bromide as the key step followed by its debenzylation with hydrogen over palladium on carbon on a multigram scale. Similarly, a series of N6-substituted 1-methyl-1H-pyrrolo[2,3-c]pyridin-6-ium halides were synthesized and reduced with sodium borohydride, showing this method to be applicable for the synthesis of different N6-substituted 1-methyl-4,5,6,7-tetrahydro-1H-pyrrolo[2, 3-c]pyridines. © Georg Thieme Verlag Stuttgart - New York.


Nechayev M.A.,National University of Pharmacy | Nechayev M.A.,Enamine Ltd. | Gorobets N.Y.,SSI Institute for Single Crystals of NAS of Ukraine | Shishkina S.V.,SSI Institute for Single Crystals of NAS of Ukraine | And 2 more authors.
Tetrahedron | Year: 2015

Derivatives of 7-amino-6-azaindole containing variable substituent in the amino group were synthesized via acid-catalyzed nucleophilic heteroaromatic substitution (SNHetarH+) using 7-chloro-6-azaindoles as substrates and aliphatic and aromatic amines as nucleophiles. The protonation of the pyridine nitrogen in the starting 7-chloro-6-azaindoles is presumed to be the key stage of the reaction mechanism discussed. © 2014 Elsevier Ltd.


Kurbatov D.I.,Sumy State University | Opanasyuk A.S.,Sumy State University | Sofronov D.S.,SSI Institute for Single Crystals of NAS of Ukraine
CriMiCo 2012 - 2012 22nd International Crimean Conference Microwave and Telecommunication Technology, Conference Proceedings | Year: 2012

In this paper some substructural and optical properties of zinc sulfide nanostructures obtained by CSVS-method on bulk-ZnSe are investigated. Examination of optical and substructural properties was performed by infrared spectroscopy and X-ray diffraction method respectively. © 2012 CriMiCo.

Loading SSI Institute for Single Crystals of NAS of Ukraine collaborators
Loading SSI Institute for Single Crystals of NAS of Ukraine collaborators