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Electromechanical Properties of Graphene Drumheads
Klimov, N. N.,Jung, S.,Zhu, S.,Li, T.,Wright, C. A.,Solares, S. D.,Newell, D. B.,Zhitenev, N. B.,Stroscio, J. A. American Association for the Advancement of Scienc 2012 Science Vol.336 No.6088
<P>We determined the electromechanical properties of a suspended graphene layer by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) measurements, as well as computational simulations of the graphene-membrane mechanics and morphology. A graphene membrane was continuously deformed by controlling the competing interactions with a STM probe tip and the electric field from a back-gate electrode. The probe tip-induced deformation created a localized strain field in the graphene lattice. STS measurements on the deformed suspended graphene display an electronic spectrum completely different from that of graphene supported by a substrate. The spectrum indicates the formation of a spatially confined quantum dot, in agreement with recent predictions of confinement by strain-induced pseudomagnetic fields.</P>
The TUS Detector of Extreme Energy Cosmic Rays on Board the Lomonosov Satellite
Klimov, P. A.,Panasyuk, M. I.,Khrenov, B. A.,Garipov, G. K.,Kalmykov, N. N.,Petrov, V. L.,Sharakin, S. A.,Shirokov, A. V.,Yashin, I. V.,Zotov, M. Y.,Biktemerova, S. V.,Grinyuk, A. A.,Grebenyuk, V. M. Springer-Verlag 2017 Space science reviews Vol.212 No.3
<P>It will also be able to register slower atmospheric transient events: atmospheric fluorescence in electrical discharges of various types including precipitating electrons escaping the magnetosphere and from the radiation of meteors passing through the atmosphere. We describe the design of the TUS detector and present results of different ground-based tests and simulations.</P>
Kutsenko Sergey,Klimov Nikolay,Pavlova Lyudmila,이재호 한국철도학회 2021 한국철도학회논문집 Vol.24 No.5
The article deals with the detection of metals in localities of dendrites in internal cavities of porcelain insulators that have been in operation on railway for a long time and exposed to high voltage of DC and AC contact network. The search for dendrites was carried out using a megohmmeter generating high voltage. Research in the vicinity of the detected conducting channels was performed using an electron-probe microanalyzer. Possible mechanisms of dendrite formation are considered.
Evgeny Bryuzgin,Viktor Klimov,Manh Duc Le,Alexander Navrotskiy,Ivan Novakov 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
We suggest a simple and reproducible strategy for fabricating durable superhydrophobic coatings on the basis ofseries of functional random copolymers of alkyl methacrylates and glycidyl methacrylate on cotton fabric surface. Theprocedure consists of the fabric treatment by solutions of copolymers in methylethylketone and following heating at 140 °C. The initial contact angles of obtained coatings on fabric surface achieve 165 °. The dependence of superhydrophobicproperties of coatings based on copolymers of glycidyl methacrylate and alkyl (meth)acrylates (with alkyl radicals С4-С18 inside chains) attached to the cotton fabric surface was studied. The comparative analysis of superhydrophobic state stability ofpolymer coatings during long-term contacts with aggressive media is presented. We evaluated the contact angles stability as afunction of prolonged contact of polymer coatings with water under saturated vapor conditions, organic solvents, andsynthetic detergents. Polymeric coatings based on a copolymer of lauryl methacrylate (С12) and glycidyl methacrylateprovide better stability of superhydrophobic properties compared with other copolymers of alkyl methacrylates.
Kurashov, Vasily N.,Allakhverdiev, Suleyman I.,Zharmukhamedov, Sergey K.,Nagata, Toshi,Klimov, Vyacheslav V.,Semenov, Alexey Yu.,Mamedov, Mahir D. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.2
An electrometric technique was used to investigate the generation of a photovoltage ($\Delta\psi$) by Mn-depleted spinach photosystem II (PS II) core particles incorporated into liposomes. In the presence of $MnCl_2$, the fast kinetically unresolvable phase of $\Delta\psi$ generation, related to electron transfer between the redox-active tyrosine $Y_Z$ and the primary plastoquinone acceptor $Q_A$ was followed by an additional electrogenic phase (${\tau}\;{\sim}\;20\;{\mu}s$, ~5% of the phase attributed to ${Y_Z}^{OX}{Q_A}^-$). The latter phase was ascribed to the transfer of an electron from the Mn, bound to the Mn-binding site of the PS II reaction center to the ${Y_Z}^{OX}$. An additional electrogenicity observed upon addition of synthetic trinuclear Mn complex-1 has a ${\tau}\;{\sim}\;50\;{\mu}s$ (~4% of the ${Y_Z}^{OX}Q_A$) and ${\tau}\;{\sim}\;160\;ms$ (~25%). The fast electrogenic component could be ascribed to reduction of ${Y_Z}^{OX}$ ox by Mn, delivered to the Mn-binding site in Mn-depleted samples after the release of the tripod ligands from the complex-1 while the slow electrogenic phase to the electron transfer from theMn-containing complex-1 attached to the protein-water boundary to the oxidized Mn at the protein-embedded Mn-binding site.
Park, Young-Shin,Bae, Wan Ki,Padilha, Lazaro A.,Pietryga, Jeffrey M.,Klimov, Victor I. American Chemical Society 2014 NANO LETTERS Vol.14 No.2
<P>Previous single-particle spectroscopic studies of colloidal quantum dots have indicated a significant spread in biexciton lifetimes across an ensemble of nominally identical nanocrystals. It has been speculated that in addition to dot-to-dot variation in physical dimensions, this spread is contributed to by variations in the structure of the quantum dot interface, which controls the shape of the confinement potential. Here, we directly evaluate the effect of the composition of the core–shell interface on single- and multiexciton dynamics via side-by-side measurements of individual core–shell CdSe/CdS nanocrystals with a sharp versus smooth (graded) interface. To realize the latter type of structures we incorporate a CdSe<SUB><I>x</I></SUB>S<SUB>1–<I>x</I></SUB> alloy layer of controlled composition and thickness between the CdSe core and the CdS shell. We observe that while having essentially no effect on single-exciton decay, the interfacial alloy layer leads to a systematic increase in biexciton lifetimes, which correlates with the increase in the biexciton emission efficiency, as inferred from two-photon correlation measurements. These observations provide direct experimental evidence that in addition to the size of the quantum dot, its interfacial properties also significantly affect the rate of Auger recombination, which governs biexciton decay. These findings help rationalize previous observations of a significant heterogeneity in the biexciton lifetimes across similarly sized quantum dots and should facilitate the development of “Auger-recombination-free” colloidal nanostructures for a range of applications from lasers and light-emitting diodes to photodetectors and solar cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-2/nl403289w/production/images/medium/nl-2013-03289w_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl403289w'>ACS Electronic Supporting Info</A></P>
Dual-Color Electroluminescence from Dot-in-Bulk Nanocrystals
Brovelli, Sergio,Bae, Wan Ki,Galland, Christophe,Giovanella, Umberto,Meinardi, Francesco,Klimov, Victor I. American Chemical Society 2014 NANO LETTERS Vol.14 No.2
<P>The emission color from colloidal semiconductor nanocrystals (NCs) is usually tuned through control of particle size, while multicolor emission is obtained by mixing NCs of different sizes within an emissive layer. Here, we demonstrate that recently introduced “dot-in-bulk” (DiB) nanocrystals can emit two-color light under both optical excitation and electrical injection. We show that the effective emission color can be controlled by adjusting the relative amplitudes of the core and shell emission bands via the intensity of optical excitation or applied bias in the cases of photoluminescence (PL) and electroluminescence (EL), respectively. To investigate the role of nonradiative carrier losses due to trapping at intragap states, we incorporate DiB NCs into functional light-emitting diodes and study their PL as a function of applied bias below the EL excitation threshold. We show that voltage-dependent changes in core and shell emissions are not due to the applied electric field but rather arise from the transfer of charges between the anode and the NC intragap trap sites. The changes in the occupancy of trap states can be described in terms of the raising (lowering) of the Fermi level for reverse (direct) bias. We find that the applied voltage affects the overall PL intensity primarily via the electron-trapping channel while bias-induced changes in hole-trapping play a less significant role, limited to a weak effect on core emission.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-2/nl403478s/production/images/medium/nl-2013-03478s_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl403478s'>ACS Electronic Supporting Info</A></P>