bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of lead and nickel cations on AgInS2/ZnS nanocrystals photoluminescence in aqueous solution
Authors: Korepanov O A , Mazing D S , Aleksandrova O A , Moshnikov V A 
Published: December 2019

Abstract
A sensing fluorescent probe based on the photoluminescence (PL) quenching of the AgInS2 colloidal nanocrystals (NCs) with a wide bandgap ZnS shell was studied for lead ions detection. The results were compared with the work where the influence of nickel ions presence on PL was studied. Addition of lead cations was accompanied by decreasing of PL intensity of the AgInS2/ZnS NCs and redshift of maxima of PL spectra. The quenching effect was described by the Stern–Volmer relationship. The obtained results could be useful for the development of new express-methods for heavy metal detection in aqueous media.
Synthesis and Luminescent Properties of Perovskite Quantum Dots
Authors: Son A G , Krivogina E V , Romanov N V 
Published: December 2019

Abstract
In this paper, we obtained nanoparticles based on ABX3 type of metal halide perovskites using the growth method of colloidal quantum dots in non-polar environment. The development of technological processes allowed us to synthesize the studied nanoparticles with room temperatures. The dependence of the photoluminescence intensity of the concentration of sols dots was determined using the photoluminescence method in the range from 400 to 700 nm. The effect of various stabilizers on the optical properties of nanoparticles was studied and the optimal composition of the stabilizer was defined. The method of dynamic light scattering was used to estimate the approximate dimensions of the synthesized ABX3 type of metal halide nanoparticles.
Investigation of a new C24 cluster for obtaining diamond-like phases: first-principle calculations
Authors: Greshnyakov Vladimir A , Belenkov Evgeny A 
Published: December 2019

Abstract
In this work, first-principle calculations of the structure of a new fullerene-like C24 cluster are carried out. The surface of this cluster is formed of four- and six-membered atomic rings. It is established that these clusters should be stable under normal conditions. A simple cubic fullerite based on the C24 clusters can be used to synthesize the diamond-like CA4 phase under bulk compression up to 4.8 GPa. In addition, X-ray diffraction patterns of the «fullerite C24 → CA4 phase» structural transition are calculated.
Mechanism of formation of light-emitting silicon hexagonal phase 9R-Si
Authors: Nikolskaya A A , Korolev D S , Mikhaylov A N , Belov A I , Konakov A A , Chigirinsky Yu I , Sushkov A A , Pavlov D A , Tetelbaum D I 
Published: December 2019

Abstract
A method of photoluminescence (PL) spectroscopy has been used to study the mechanism of formation of light-emitting hexagonal 9R-Si phase by krypton ion implantation into thermally grown oxide layer on silicon substrate with subsequent annealing. The PL band at ∼ 1246 nm previously assigned to this phase appears at isochronous step-by-step annealing temperatures of 600 °C and higher as well as for one-step annealing. In addition, the PL bands at ∼1324 and ∼1408 nm previously observed in ion-implanted silicon and assigned to self-interstitial complexes are present in our case. The decrease in their intensities and simultaneous enhancement of the 9R-Si band are observed with increase in annealing temperature. It is concluded that the mechanical stresses arising in SiO2/Si system during implantation are responsible for the formation of the 9R-Si phase.
Growth of a multicomponent crystal via Chernov’s mechanism
Authors: Redkov A V , Kukushkin S A , Osipov A V 
Published: December 2019

Abstract
The work is devoted to the growth of a multicomponent crystal via Chernov’s mechanism, namely, due to diffusion of its own components from vapor or solution and their subsequent incorporation directly into steps. Equations describing the rate of advance of a group of equidistant steps are derived taking into account individual properties: diffusion coefficients, atomic volumes of all components.
Monolith GaAsP/Si dual-junction solar cells grown by MBE
Authors: Sobolev M S , Ilkiv I V , Lazarenko A A , Mizerov A M , Nikitina E V , Pirogov E V , Timoshnev S N , Baranov A I , Bouravleuv A D 
Published: December 2019

Abstract
The growth of monolith GaAsP/Si dual-junction solar cells on Si substrates by molecular-beam epitaxy is demonstrated. The technological method for the formation of a highly doped tunnel p+/n+ junction was developed. An obvious increase in the value of the open-circuit voltage indicating the contribution of the top-junction in the total open-circuit voltage monolithic dual-junction solar cells was found.
XPS analysis of metallic wetting layer in In/GaAs system obtained at different growth temperatures
Authors: Eremenko M M , Balakirev S V , Chernenko N E , Ageev O A , Solodovnik M S 
Published: December 2019

Abstract
In this paper we investigate the processes of nucleation and growth of In/GaAs(001) nanostructures by droplet epitaxy. We determined the temperature dependence of the wetting layer thickness. Using the X-ray photoelectron spectroscopy technique to examine of samples with In/GaAs droplet nanostructures formed under different conditions we experimentally confirm an increase in the metallic wetting layer thickness with a decrease in the deposition temperature. Analysis of the data obtained shows that droplet nanostructures consist of In are without Ga impurity.
On the stress relaxation mechanism of GaN thin films grown on Si(111) substrates
Authors: Koryakin A A , Mizerov A M , Bouravleuv A D 
Published: December 2019

Abstract
Gallium nitride (GaN) thin films grown on Si(111) substrates via plasma-assisted molecular beam epitaxy were investigated. The morphology of GaN films was studied by scanning electron microscopy. It was found that GaN films at nanoscale contain a large amount of cavities. The Raman measurements of GaN/Si(111) system were performed and showed that the position of the GaN E2 (TO) band is close to that of unstrained GaN. We proposed a stress relaxation mechanism to explain the low stress state of GaN films.
Investigation of indium antimonide nanoparticles, obtained by the method of liquid chemical etching
Authors: Mikhailov A I , Kabanov V F , Gavrikov M V 
Published: December 2019

Abstract
The possibility of obtaining indium antimonide nanoparticles by method of liquid chemical etching was analyzed. The dependence of obtained nanoparticles size on the etching time and composition of the etcher has been investigated. The nanoparticles were etched in solutions prepared on the basis of the peroxide-ammonia mixture; cetyltrimethylammonium bromide, a cationic surfactant, was used to stabilize the surface of the nanoparticles. The obtained quantum dots of indium antimonide were studied by the methods of differential normalized tunnel current-voltage characteristics, electron microscopy, particle size analysis and spectral dependence of the absorption coefficient.
Arsenic background pressure effect on In droplet morphology
Authors: Mikhaylin I A , Balakirev S V , Eremenko M M , Chernenko N E , Solodovnik M S 
Published: December 2019

Abstract
The paper presents the results of an experimental study of the effect of arsenic background pressure on the characteristics of droplet nanostructures formed by droplet epitaxy. We have shown that with an increase in the initial size of the droplets, the sensitivity of the system to the background pressure decreases. It is shown that the residual pressure of arsenic can be used as an additional control parameter of the droplet epitaxy technique.
Optical activity and SEM of chiral chitosan ascorbates
Authors: Malinkina O N , Zhuravleva Yu Yu , Zudina I V , Shipovskaya A B 
Published: December 2019

AbstractThe effect of the chiosan ascorbate chirality on its structural features in solution and in the solid state was studied using optical rotation dispersion and scanning electron microscopy. It has been established that the isomeric form of ascorbic acid has a significant impact on the stereomeric ordering of chiral chitosan ascorbate macromolecules in solution and solid-phase supramolecular structures isolated therefrom.
Photovoltaic properties of InP NWs/p-Si heterostructure
Authors: Kotlyar K P , Vershinin A V , Reznik R R , Pavlov S I , Kudryashov D A , Zelentsov K S , Mozharov A M , Karaborchev A A , Mukhin I S , Soshnikov I P , Cirlin G E 
Published: December 2019

Abstract
The experimental and modelling results of the investigation of photovoltaic properties of the InP nanowires grown on p-Si substrate are presented. It is shown that InP 2D-layer between nanowires on Si is II-type heterojanction. The resulting structure exhibits an open-circuit voltage (Voc) of 0,37 V, a short-circuit current density (Jsc) of 10.6 mA/cm2, a fill factor (FF) of 0.61 and efficiency of 2.4% at 1 sun. The InP/p-Si structure can be applied as prototype for solar cells or the photosensitive component in an integrated circuit based on silicon technology.
Raman analysis of graphene on SiC
Authors: Shubina K Yu , Sharov V L , Denisov D V , Mukhin I S , Babichev A V 
Published: December 2019

Abstract
The paper presents the results of a study of the structural quality of grapheme produced by the thermal decomposition of 4H-SiC. Maps obtained by atomic force microscopy (AFM mapping) have demonstrated the existence of characteristic terraces on the surface. The Raman spectra have demonstrated the existence of G and 2D lines. A narrow Lorentzian 2D peak and low intensity of the G peak in addition to the reflectance mapping data confirms the conclusion that there is primarily monolayer graphene on the sample surface.
Structal and Optical Properties Algaas Nanowires Grown by Mbe on Si(111) Substrate
Authors: Vershinin A V , Shtrom I V , Kotlyar K P , Filosofov N G , Serov A Yu , Samsonenko Yu B , Ilkiev I V , Reznik R R , Cirlin G E 
Published: December 2019

Abstract
In this work, we present the results of photoluminescence measurements of wurtzite AlGaAs nanowires, coupled with the transmission electron microscopy structural analysis. AlGaAs NWs were grown by molecular beam epitaxy under the nominal aluminum content of 0.3 - 0.8. The results of TEM measurements demonstrated wurtzite crystal structure of AlGaAs nanowires.
The method of intracellular fluorescent species in situ production within living cells by femtosecond laser pulses
Authors: Osychenko A A , Zalessky A D , Shakhov A M , Astafiev A A , Syrchina M S , Tochilo U A , Karmenyan A V , Nadtochenko V A 
Published: December 2019

Abstract
Here we report on a novel non-invasive technique of in situ fluorescence species creation with the use of tightly-focused femtosecond laser beam with 800 nm wavelength. Fluorescent species can be created in a strictly defined area inside a living cell, without damaging the plasma membrane and surrounding structures. Species are characterized by bright fluorescence with a maximum at 520 nm, high stability and low toxicity. No significant effect of fluorescent species on cell viability and development is observed. The technique of in situ fluorescence species creation is an attractive tool for in vivo cell visualization and intracellular tracking because of its high accuracy and low damage effect.
Reduced graphene oxide based nanobiocomposite as basis for flexible biosensors
Authors: Komarov I A , Struchkov N S , Antipova O M , Kalinnikov A N , Shcherbin S N 
Published: December 2019

Abstract
Flexible selective electrochemical biosensor based on reduced graphene oxide film and short oligonucleotides (aptamers) was developed. Laser scribing was applied for graphene reduction due to controllable reduction rate and simple devises pattering. Optimal parameters of film reduction were determined for effective aptamers coupling, by varying laser output power. Mild reduced graphene oxide, as was expected, revealed better reactivity for aptamers coupling. Resistive response to biosensors exposure to thrombin and albumin proteins was measured. As a result we developed bionanocomposite that can be used in a new generation of available low-cost biosensors.
Dynamic characteristics of totally glycosylated human glucocerebrosidase carrying N370S substitution
Authors: Cheblokov A A , Rychkov G N 
Published: December 2019

Abstract
Full-atom models of a totally glycosylated wild type human glucocerebrosidase (GBA) and its mutant form N370S were constructed. Molecular dynamics simulations in explicit water box have revealed high flexibility and mobility of glycans bonded to the enzyme; glycans was able to spread a rather large volume determined by their length. Amino acid substitution N370S decreased the flexibility of GBA polypeptide chain region forming Loop 1 (residues 311-319), while the mobility of catalytic residues remained at the similar level both in wild type and N370S GBA mutant form.
Study of refractive index of human stomach cancer tissue in THz frequency range
Authors: Kuzikova A V , Grigorev R O , Kurasova A P , Demchenko P S , Senyuk A V , Zakharenko A A , Belolipetskaya J R , Khamid A H , Khodzitsky M K 
Published: December 2019

Abstract
In this paper, the samples of healthy and cancer tissues of the internal and external sides of a human stomach were studied by time-domain terahertz reflectometry in the frequency range from 0.2 to 1 THz. Since healthy and cancer tissues have different morphological structure, and also contain different amounts of water, their optical properties and spectral characteristics differ. It was found that the refractive index of internal side of stomach cancer tissue is greater than for the healthy one. The refractive index of the external side of stomach cancer tissue is less than for the healthy one. This effect should be taken into account for development of stomach cancer diagnosis.
Age and gender recognition from speech signals
Authors: Abdulsatar Assim Ara , Davydov V V , Yushkova V V , Glinushkin A P , Rud V Yu 
Published: December 2019

Abstract
The aim of this research is to identify gender and age from speech, the system consists of two parts. The first part is called pre-processing and future extraction. The second part is called classification. This research investigates an automatic gender and age recognizer from speech. First four formant frequencies and twelve MFCCs are used to extract relevant features to recognize the gender. K-NN has been used as a classifier for the age recognizer model, stimulated using MATLAB. A special selectin of solid feature is used in this work to improve the accuracy of the gender and age classifiers based on the frequency range that the features represent.
Shellac hologram
Authors: Toropova A , Fokina M 
Published: December 2019

Abstract
The results of experimental research of rainbow holograms made of edible shellac, analysis of diffraction efficiency and analysis of the hologram lifetime in various environmental conditions are reported in this work. The properties of shellac as a food biopolymer allow to use it for creation edible holographic coatings on food and pharmaceutical products. Edible shellac holograms can be use for creation images not using food dyes, original appearance, labels, sensors of shelf life and observance of storage regulations of products.
Study of human skin radiation in the terahertz frequency range
Authors: Baksheeva K. , Vdovydchenko A. , Gorshkov K. , Ozhegov R. , Kinev N. , Koshelets V. , Goltsman G. 
Published: December 2019

Abstract
The radiation of human skin in the terahertz frequency range under the influence of mental stresses has been studied in the current work. An experimental setup for observation of changes in human skin radiation, which occur under the influence of psychological stresses, by means of a superconducting integrated receiver has been developed. More than 30 volunteers participate in these studies, which allows us to verify presence of correlation between the signals from the superconducting integrated terahertz receiver and other sensors that monitor human mental stress.
Semiconductor resonant all-optical temperature sensor and thermal release trigger of encapsulated anti-cancer drugs for in vitro studies
Authors: Zograf G P , Petrova M I , Petrov M I , Belov P A , Komissarenko F E , Makarova E K , Pushkarev A P , Sun Y , Ghosh P , Li Q , Qiu M , Makarov S V , Zyuzin M V 
Published: December 2019

Abstract
Nanostructures made of high-index semiconductors (n > 2.5) with the several orders of magnitude lower losses than noble metals possess (Au, Ag, Pt etc.) are gaining high interest in recent years for various advanced optical applications, including nanothermometry and optical heating. Owing to the high-Q of Mie-optical modes that are being supported by the nanostructures, such nanoresonators can be considered as a powerful tool for light absorption at the nanoscale. However, high potential of resonant semiconductor nanoparticles in drug release and delivery applications has not been studied yet. In this work, we prove both experimentally and theoretically that optically resonant iron-oxide (III) (Fe2O3) can be employed as a remote optical trigger for thermal rupture of polymer microcontainers used as a drug delivery platform. Such approach allows one to measure real-time temperature via thermally sensitive Raman signal of iron-oxide nanoparticles, that were embedded into the walls of microcontainers. We believe that, suggested system consisting of resonant semiconductor nanoparticles and polymer carrier capsules can serve as a highly efficient drug delivery platform with controllable remote release with temperature feedback.
Development of a measuring device for the study of thermal processes during the polymerase chain reaction
Authors: Reznik V S , Kruglov V A , Petrov A I , Davydov V V , Glinuchkin A P , Rud’ V Yu 
Published: December 2019

Abstract
In this paper, we consider the problem of studying transient temperature processes in thermal blocks of analyzers of nucleic acids based on real-time polymerase chain reaction, in particular, the ANK-32 device. Characteristics of transient temperature processes were obtained using sensors built into the ANK-32. The result of the work is an original measuring device that is able to clarify the characteristics is obtained.
Infection of aerosol concentration on the radon decay products fractions
Authors: Mostafa Mostafa Y A , Khalaf Hyam N B , Zhukovsky M 
Published: December 2019

Abstract
In this work, an experimental setup has been constructed to study the effect of aerosol concentration on the size distribution and unattached fraction of radon decay products. The experiments are conducted with 2 m3 standard radon chamber under controlled conditions (aerosol concentration, temperature and humidity). Number concentration and size distribution of aerosols inside radon chamber are measured with a Diffusion Aerosol Spectrometer (DAS 2702M, range from 5 nm to 10 μm). The activity size distribution of radioactive aerosols is estimated with diffusion battery. Number distribution diameter at low aerosol concentration has interval 50-100 nm. When additional aerosols injected to the radon chamber, distribution peak shifted to large diameters 70-150 nm at high aerosol particle concentration. At high aerosol concentration the unattached fraction fell sharply to 10-15% of the total activity compared to 50-70% when the aerosol concentration is low. The ratio between the fractions of the unattached and attached is in the range from 0.9 to 1.2 at low aerosol concentration. At high aerosol concentration, this ratio becomes from 0.09 to 0.14.
The empowerment of biometric systems of psychophysical research
Authors: Bobrova D , Boronenko M , Bikberdina N 
Published: December 2019

Abstract
Interest in detecting the psychophysical state of a person according to various biometric data (KGR, pupillography and profiling, etc.) is becoming more widespread every year. The most statistically reliable and resistant to counterfeiting systems are the identification of a person by the iris and face. Biometric identification systems can be combined. This paper presents proposals for improving the existing systems of recognition of the psychophysical state of a person.
Formation of Structurally Ordered Nanoscale Complexes of DNA with Nuclear Proteins HMGB1 and H1
Authors: Chikhirzhina E , Romanov N , Polyanichko A 
Published: December 2019

Abstract
The structural organization of DNA in complex with linker histone H1 and non-histone chromosomal protein HMGB1 have been studied using atomic force microscopy and vibrational spectroscopy. The possibility of formation ordered nanoscale DNA-protein complexes is reported.
Upconversion luminescence of CaF2-SrF2-ErF3 single crystals upon 1.5 μm laser excitation
Authors: Lyapin A A , Ermakov A S , Kuznetsov S V , Gushchin S V , Ryabochkina P A , Konyushkin V A , Nakladov A N , Fedorov P P 
Published: December 2019

Abstract
In present work, the spectral-luminescent properties of CaF2-SrF2-ErF3 (CaF2-SrF2:Er) single crystals were investigated. The upconversion luminescence (UCL) of CaF2-SrF2: Er in the visible and infrared spectral regions upon excitation of the 4I13/2 level Er3+ ions were studied for the first time. The absolute energy yields of the UCL upon laser excitation at 1.5 μm are determined for CaF2-SrF2:Er. The possible application of fluoride crystals for increasing the efficiency of solar cells was discussed.
Memristive properties of solar cells based on perovskite and polymer composite
Authors: Masharin M A , Gets D S , Verkhoglyadov G S , Makarov S V , Zahidov A A 
Published: December 2019

Abstract
Organic-inorganic halide perovskites recently have emerged as a perspective material for using in solar cells. This material has many perspective properties, one of them is the ion migration. Modern ionic memristors, electric circuit elements that can change its resistance depending on the current flowing through it, is based on this phenomenon. In this paper, we present the experimentally obtained memristic properties in the perovskite solar cell, which contains composite of perovskite and polymer as absorbing layer instead of pure perovskite.
The study of the optical properties of transparent conductive oxides SnO2:Sb, obtained by spray pyrolysis
Authors: Zinchenko T O , Pecherskaya E A , Nikolaev K O , Golubkov P E , Shepeleva Y V , Artamonov D V 
Published: December 2019

Abstract
The study results of the dependences of the refractive index and samples transmittance of transparent conductive films of tin dioxide depending on wavelength are presented. Films with different doping levels, with different solutions volumes were synthesized on an automated installation by spray pyrolysis. It is shown that the transmittance practically does not depend on the amount of substance sprayed onto the substrate; the transmittance practically does not depend on the solution volume, but depends on the impurity concentration. The chemical composition and temperature of film deposition influence on its refractive index is established. The research results can be used in the development of technologies for the manufacture of optoelectronic structures containing transparent conductive coatings.
Design and investigation of GaPAsN/Si light-emitting diode
Authors: Lazarenko A , Gudovskikh A , Baranov A , Sobolev M , Pirogov E , Nikitina E 
Published: December 2019

Abstract
The heterostructure of light-emitting diode on a silicon substrate with an active region based on A3B5N was synthesized and investigated. Light-emitting diode demonstrates effective electroluminescence at 645 nm up to the 360 K. This indicates the high crystalline and optical quality of the light-emitting structure, as well as the prospects of this approach for the development of silicon integrated photonics.