Elena Sheka

Prof. Elena Sheka

RUDN University
orcid

Research Focus & Metrics

Academic Career Length

62Years (1965-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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14 October 2020 in Nanomaterials
Verified
Journal Article
Open access
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ESElena Sheka
Elena Sheka
YGYevgeny Golubev
Yevgeny Golubev
NPNadezhda A. Popova
Nadezhda A. Popova
The standard D-G-2D pattern of Raman spectra of sp2 amorphous carbons is considered from the viewpoint of graphene domains presenting their basic structure units (BSUs) in terms of molecular spectroscopy. The molecular approximation allows connecting the characteristic D-G doublet spectra image of one-phonon spectra with a considerable dispersion of the C=C bond lengths within graphene domains, governed by size, heteroatom necklace of BSUs as well as BSUs packing. The interpretation of 2D two-phonon spectra reveals a particular role of electrical anharmonicity in the spectra formation and attributes this effect to a high degree of the electron density delocalization in graphene domains. A size-stimulated transition from molecular to quasi-particle phonon consideration of Raman spectra was experimentally traced, which allowed evaluation of a free path of optical phonons in graphene crystal.

20 August 1980 in Journal of Physics C: Solid State Physics
Verified
Journal Article
Closed access
INI Natkaniec
I Natkaniec
EBE L Bokhenkov
E L Bokhenkov
BDB Dorner
B Dorner
JKJ Kalus
J Kalus
GMG A Mackenzie
G A Mackenzie
ESElena Sheka
Elena Sheka

2 January 2014 in International Journal of Smart and Nano Materials
Verified
Journal Article
Open access
ESElena Sheka
Elena Sheka
NRNatalia N. Rozhkova
Natalia N. Rozhkova
Shungite is presented as a natural carbon allotrope of a multilevel fractal structure that is formed by a successive aggregation of ~1 nm reduced graphene oxide nanosheets. Turbostratic stacks of the sheets of ~1.5 nm in thickness and globular composition of the stacks of ~6 nm in size determine the secondary and tertiary levels of the structure. Aggregates of globules of tens of nanometers complete the structure. Molecular theory of graphene oxide, supported by large experience gained by the modern graphene science, has led to the foundation of the suggested presentation. The microscopic view has found a definite confirmation when analyzing the available empirical appearance of shungite. To our knowledge, this is the first time a geological process is described at quantum level.

1 January 2007 in International Journal of Quantum Chemistry
Verified
Journal Article
Closed access
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ESElena Sheka
Elena Sheka

1 January 1965 in Physica Status Solidi (b)
Verified
Journal Article
Closed access
PDF file
ADA. S. Davydov
A. S. Davydov
ESElena Sheka
Elena Sheka

20 April 1982 in Journal of Physics C: Solid State Physics
Verified
Journal Article
Closed access
PDF file
BDB Dorner
B Dorner
EBE L Bokhenkov
E L Bokhenkov
SCS L Chaplot
S L Chaplot
JKJ Kalus
J Kalus
INI Natkaniec
I Natkaniec
ESElena Sheka
Elena Sheka