38 results on '"Mikhailovskii, Vladimir"'
Search Results
2. Visualization of graphene grain boundaries through oxygen intercalation
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Bokai, Kirill A., Shevelev, Viktor O., Marchenko, Dmitry, Makarova, Anna A., Mikhailovskii, Vladimir Yu., Zakharov, Alexei A., Vilkov, Oleg Yu., Krivenkov, Maxim, Vyalikh, Denis V., and Usachov, Dmitry Yu.
- Published
- 2021
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3. Sustainable composite pervaporation membranes based on sodium alginate modified by metal organic frameworks for dehydration of isopropanol
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Kuzminova, Anna I., Dmitrenko, Mariia E., Poloneeva, Daria Y., Selyutin, Artem A., Mazur, Anton S., Emeline, Alexei V., Mikhailovskii, Vladimir Y., Solovyev, Nikolay D., Ermakov, Sergey S., and Penkova, Anastasia V.
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- 2021
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4. Ultra-Low Intensity Light-Driven Ionic Conductivity through a Plasmonic Nanopore.
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Lebedev, Denis V., Vaulin, Nikita V., Afonicheva, Polina K., Vorobyov, Alexander A., Mozharov, Alexey M., Sharov, Vladislav A., Mikhailovskii, Vladimir Yu., Kirilenko, Demid A., Permyakov, Dmitry V., Logunov, Lev S., Ivanov, Yuri D., Ryzhkov, Ilya I., Bukatin, Anton S., Evstrapov, Anatoly A., Makarov, Sergey V., and Mukhin, Ivan S.
- Abstract
Solid-state nanopore devices with plasmonic nanoantennas are powerful tools that allow for working with individual particles and molecules in solution as well as providing light-induced control of ionic current flow through them. However, the ionic current flow manipulation by light still requires high power densities and, thus, results in the optical heating of the nanopore. Here, we solve this problem by using a 5 nm nanopore in the gap of a plasmonic bow-tie nanoantenna on a SiN
x membrane irradiated by a broadband spectrum of incident light. In this regime, photons are not only strongly localized around the nanopore but also efficiently excite and trap charge carriers on defect states in the band gap of the material of the nanopore walls. As a result, ionic current flow modulation is achieved with several orders of magnitude lower power densities (around 0.035 W/cm²) from a white-light lamp than in previous works employing spectrally narrow laser sources (100 -105 W/cm²). The lamp irradiation causes a 21% increase in conductivity for a nanopore without a nanoantenna and a 35% increase in conductivity for a nanoantenna-decorated nanopore at the same power of irradiation. The revealed low-intensity approach for ionic current control is preferable for the study of biological objects. [ABSTRACT FROM AUTHOR]- Published
- 2024
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5. Direct laser-induced deposition of AgPt@C nanoparticles on 2D and 3D substrates for electrocatalytic glucose oxidation
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Vasileva, Anna, Haschke, Sandra, Mikhailovskii, Vladimir, Gitlina, Anastasia, Bachmann, Julien, and Manshina, Alina
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- 2020
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6. Novel mixed-matrix membranes based on polyvinyl alcohol modified by carboxyfullerene for pervaporation dehydration
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Penkova, Anastasia V., Dmitrenko, Maria E., Savon, Nadezhda A., Missyul, Alexander B., Mazur, Anton S., Kuzminova, Anna I., Zolotarev, Andrey A., Mikhailovskii, Vladimir, Lahderanta, Erkki, Markelov, Denis A., Semenov, Konstantin N., and Ermakov, Sergey S.
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- 2018
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7. Fabrication and characterization of polyamide-fullerenol thin film nanocomposite hollow fiber membranes with enhanced antifouling performance
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Plisko, Tatiana V., Liubimova, Alena S., Bildyukevich, Alexandr V., Penkova, Anastasia V., Dmitrenko, Maria E., Mikhailovskii, Vladimir Y., Melnikova, Galina B., Semenov, Konstantin N., Doroshkevich, Nelya V., and Kuzminova, Anna I.
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- 2018
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8. Metal surface coloration by oxide periodic structures formed with nanosecond laser pulses
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Veiko, Vadim, Karlagina, Yulia, Moskvin, Mikhail, Mikhailovskii, Vladimir, Odintsova, Galina, Olshin, Pavel, Pankin, Dmitry, Romanov, Valery, and Yatsuk, Roman
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- 2017
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9. SARS-CoV-2 Impact on Red Blood Cell Morphology.
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Kondratov, Kirill A., Artamonov, Alexander A., Mikhailovskii, Vladimir Yu., Velmiskina, Anastasiya A., Mosenko, Sergey V., Grigoryev, Evgeniy A., Anisenkova, Anna Yu., Nikitin, Yuri V., Apalko, Svetlana V., Sushentseva, Natalya N., Ivanov, Andrey M., and Scherbak, Sergey G.
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ERYTHROCYTES ,CELL morphology ,SARS-CoV-2 ,COVID-19 pandemic ,COVID-19 - Abstract
Severe COVID-19 alters the biochemical and morphological characteristics of blood cells in a wide variety of ways. To date, however, the vast majority of research has been devoted to the study of leukocytes, while erythrocyte morphological changes have received significantly less attention. The aim of this research was to identify erythrocyte morphology abnormalities that occur in COVID-19, compare the number of different poikilocyte types, and measure erythrocyte sizes to provide data on size dispersion. Red blood cells obtained from 6 control donors (800–2200 cells per donor) and 5 COVID-19 patients (800–1900 cells per patient) were examined using low-voltage scanning electron microscopy. We did not discover any forms of erythrocyte morphology abnormalities that would be specific to COVID-19. Among COVID-19 patients, we observed an increase in the number of acanthocytes (p = 0.01) and a decrease in the number of spherocytes (p = 0.03). In addition, our research demonstrates that COVID-19 causes an increase in the median (p = 0.004) and interquartile range (p = 0.009) when assessing erythrocyte size. The limitation of our study is a small number of participants. [ABSTRACT FROM AUTHOR]
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- 2023
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10. Conductivity-based approach to estimate average bundle length in randomly oriented network of single-walled carbon nanotubes.
- Author
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Pavlov, Alexander, Mitin, Dmitry, Vorobyev, Alexander, Raudik, Sergey, Berdnikov, Yury, Mozharov, Alexey, Mikhailovskii, Vladimir, Krasnikov, Dmitry V., Kopylova, Daria S., Polozkov, Roman, Nasibulin, Albert G., and Mukhin, Ivan
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CARBON nanotubes - Abstract
In this paper, we report a method to estimate the average length of bundles in a randomly oriented network of single-walled carbon nanotubes (SWCNTs) by analyzing the dependence of its sheet resistance on the distance between contacts. We propose an analytical model to verify the method and find the model's limitations using Monte Carlo simulations. Then, we apply the proposed approach to experimental results acquired from 95% (at 550 nm wavelength) transparent SWCNT films. The proposed method to estimate the average SWCNT bundle length can be used in situ and does not require any specific sample preparation step that can distort the SWCNT network. [ABSTRACT FROM AUTHOR]
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- 2023
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11. Diagnosis of Prostate Cancer through the Multi-Ligand Binding of Prostate-Derived Extracellular Vesicles and miRNA Analysis.
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Zabegina, Lidia, Zyatchin, Ilya, Kniazeva, Margarita, Shalaev, Andrey, Berkut, Maria, Sharoyko, Vladimir, Mikhailovskii, Vladimir, Kondratov, Kirill, Reva, Sergey, Nosov, Alexandr, and Malek, Anastasia
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EXTRACELLULAR vesicles ,MICRORNA ,CANCER diagnosis ,PROSTATE ,BINDING site assay ,ANDROGEN receptors ,APTAMERS - Abstract
Background: The development of new non-invasive markers for prostate cancer (PC) diagnosis, prognosis, and management is an important issue that needs to be addressed to decrease PC mortality. Small extracellular vesicles (SEVs) secreted by prostate gland or prostate cancer cells into the plasma are considered next-generation diagnostic tools because their chemical composition might reflect the PC development. The population of plasma vesicles is extremely heterogeneous. The study aimed to explore a new approach for prostate-derived SEV isolation followed by vesicular miRNA analysis. Methods: We used superparamagnetic particles functionalized by five types of DNA-aptamers binding the surface markers of prostate cells. Specificity of binding was assayed by AuNP-aptasensor. Prostate-derived SEVs were isolated from the plasma of 36 PC patients and 18 healthy donors and used for the assessment of twelve PC-associated miRNAs. The amplification ratio (amp-ratio) value was obtained for all pairs of miRNAs, and the diagnostic significance of these parameters was evaluated. Results: The multi-ligand binding approach doubled the efficiency of prostate-derived SEVs' isolation and made it possible to purify a sufficient amount of vesicular RNA. The neighbor clusterization, using three pairs of microRNAs (miR-205/miR-375, miR-26b/miR375, and miR-20a/miR-375), allowed us to distinguish PC patients and donors with sensitivity—94%, specificity—76%, and accuracy—87%. Moreover, the amp-ratios of other miRNAs pairs reflected such parameters as plasma PSA level, prostate volume, and Gleason score of PC. Conclusions: Multi-ligand isolation of prostate-derived vesicles followed by vesicular miRNA analysis is a promising method for PC diagnosis and monitoring. [ABSTRACT FROM AUTHOR]
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- 2023
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12. 3D Nanocomposite with High Aspect Ratio Based on Polyaniline Decorated with Silver NPs: Synthesis and Application as Electrochemical Glucose Sensor.
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Vasileva, Anna A., Mamonova, Daria V., Mikhailovskii, Vladimir, Petrov, Yuri V., Toropova, Yana G., Kolesnikov, Ilya E., Leuchs, Gerd, and Manshina, Alina A.
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ELECTROCHEMICAL sensors ,POLYANILINES ,GLUCOSE analysis ,LABORATORY rats ,ALUMINUM oxide ,SILVER ,BLOOD plasma - Abstract
In this paper, we present a new methodology for creating 3D ordered porous nanocomposites based on anodic aluminum oxide template with polyaniline (PANI) and silver NPs. The approach includes in situ synthesis of polyaniline on templates of anodic aluminum oxide nanomembranes and laser-induced deposition (LID) of Ag NPs directly on the pore walls. The proposed method allows for the formation of structures with a high aspect ratio of the pores, topological ordering and uniformity of properties throughout the sample, and a high specific surface area. For the developed structures, we demonstrated their effectiveness as non-enzymatic electrochemical sensors on glucose in a concentration range crucial for medical applications. The obtained systems possess high potential for miniaturization and were applied to glucose detection in real objects—laboratory rat blood plasma. [ABSTRACT FROM AUTHOR]
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- 2023
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13. Tuning the Optical Properties and Conductivity of Bundles in Networks of Single-Walled Carbon Nanotubes.
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Mitin, Dmitry, Vorobyev, Alexandr, Pavlov, Alexander, Berdnikov, Yury, Mozharov, Alexey, Mikhailovskii, Vladimir, Ramirez B, Javier A., Krasnikov, Dmitry V., Kopylova, Daria S., Kirilenko, Demid A., Vinnichenko, Maxim, Polozkov, Roman, Nasibulin, Albert G., and Mukhin, Ivan
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- 2022
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14. Direct Laser Writing of Copper Micropatterns from Deep Eutectic Solvents Using Pulsed near-IR Radiation.
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Avilova, Ekaterina A., Khairullina, Evgeniia M., Shishov, Andrey Yu., Eltysheva, Elizaveta A., Mikhailovskii, Vladimir, Sinev, Dmitry A., and Tumkin, Ilya I.
- Abstract
In this study, we developed a method for the fabrication of electrically conductive copper patterns of arbitrary topology and films on dielectric substrates, by improved laser-induced synthesis from deep eutectic solvents. A significant increase in the processing efficiency was achieved by acceptor substrate pretreatment, with the laser-induced microplasma technique, using auxiliary glass substrates and optional laser post-processing of the recorded structures; thus, the proposed approach offers a complete manufacturing cycle, utilizing a single, commercially available, pulsed Yb fiber laser system. The potential implications of the presented research are amplified by the observation of laser-induced periodic surface structures (LIPSSs) that may be useful for the further tuning of tracks' functional properties. [ABSTRACT FROM AUTHOR]
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- 2022
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15. Modified silicone rubbers for fabrication and contacting of flexible suspended membranes of n-/p-GaP nanowires with single-walled carbon nanotube transparent contact
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Neplokh, Vladimir, Kochetkov, Fedor M., Deriabin, Konstantin V., Fedorov, Vladimir V., Bolshakov, Alexey D., Eliseev, Igor E., Mikhailovskii, Vladimir Yu., Ilatovskii, Daniil A., Krasnikov, Dmitry V., Tchernycheva, Maria, Cirlin, George E., Nasibulin, Albert G., Mukhin, Ivan S., and Islamova, Regina M.
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Chemical Physics (physics.chem-ph) ,Condensed Matter - Materials Science ,Physics - Chemical Physics ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,Applied Physics (physics.app-ph) ,Physics - Applied Physics - Abstract
This work proposes new chemical and mechanical materials and techniques for III-V semiconductor NW/silicone membrane formation and optoelectronic device fabrication. Molecular beam epitaxy (MBE)-synthesized n-, p- and i-GaP NWs were encapsulated by introduced G-coating method into synthesized polydimethylsiloxane-graft-polystyrene and released from the Si growth substrate. The fabricated membranes were contacted with different materials including single-walled carbon nanotubes or ferrocenyl-containing polymethylhydrosiloxane with and without multi-walled carbon nanotubes doping. The electrical connection of the fabricated membranes was verified by electron beam induced current (EBIC) spectroscopy. The developed methods and materials can be applied for fabrication of high quality flexible inorganic optoelectronic devices., 25 pages, 17 figures, 1 table
- Published
- 2019
16. Single-particle Mie-resonant all-dielectric nanolasers
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Tiguntseva, Ekaterina Yu., Koshelev, Kirill L., Furasova, Aleksandra D., Mikhailovskii, Vladimir Yu., Ushakova, Elena V., Baranov, Denis G., Shegai, Timur O., Zakhidov, Anvar A., Kivshar, Yuri S., and Makarov, Sergey V.
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FOS: Physical sciences ,Applied Physics (physics.app-ph) ,Physics - Applied Physics ,Optics (physics.optics) ,Physics - Optics - Abstract
All-dielectric subwavelength structures utilizing Mie resonances provide a novel paradigm in nanophotonics for controlling and manipulating light. So far, only spontaneous emission enhancement was demonstrated with single dielectric nanoantennas, whereas stimulated emission was achieved only in large lattices supporting collective modes. Here, we demonstrate the first single-particle all-dielectric monolithic nanolaser driven by Mie resonances in visible and near-IR frequency range. We employ halide perovskite CsPbBr$_3$ as both gain and resonator material that provides high optical gain (up to $\sim 10^4$ cm$^{-1}$) and allows simple chemical synthesis of nanocubes with nearly epitaxial quality. Our smallest non-plasmonic Mie-resonant single-mode nanolaser with the size of 420 nm operates at room temperatures and wavelength 535 nm with linewidth $\sim 3.5$ meV. These novel lasing nanoantennas can pave the way to multifunctional photonic designs for active control of light at the nanoscale.
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- 2019
17. In situ microsynthesis of polyaniline: synthesis–structure–conductivity correlation.
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Vasileva, Anna, Pankin, Dmitrii, Mikhailovskii, Vladimir, Kolesnikov, Ilya, Mínguez-Bacho, Ignacio, Bachmann, Julien, and Manshina, Alina
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POLYANILINES ,MORPHOLOGY ,TEMPERATURE - Abstract
An in situ microsynthesis of polyaniline films directly on a substrate was developed and considered from the viewpoint of conductivity as a key functional property. The microsynthesis was carried out in a reaction volume of 60 μL. The multi-analytical study of polyaniline samples obtained by in situ microsynthesis was performed. The effect of synthesis parameters (reaction time, temperature, and number of synthetic procedures on the same substrate) on the structure, morphology and conductivity was investigated. It was shown that the in situ microsynthesis allows for the formation of polyaniline films in the whole range of synthesis parameters chosen. The correlations between synthetic conditions, structural parameters and conductivity are discussed. The found correlations between FTIR parameters and conductivity can be considered as a promising tool for PANI characterization. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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18. Heterogeneity of the nucleic acid repertoire of plasma extracellular vesicles demonstrated using high-sensitivity fluorescence-activated sorting.
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Kondratov, Kirill, Nikitin, Yuri, Fedorov, Anton, Kostareva, Anna, Mikhailovskii, Vladimir, Isakov, Dmitry, Ivanov, Andrey, and Golovkin, Alexey
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EXTRACELLULAR vesicles ,ERYTHROCYTES ,NUCLEAR DNA ,MITOCHONDRIAL DNA ,FLUORESCEIN isothiocyanate ,BLOOD plasma - Abstract
The aim of this study was to investigate cell source-dependent nucleic acids repertoire of diverse subpopulations of plasma extracellular vesicles (EVs). Blood plasma from nine healthy volunteers was used for the analysis. Samples of EVs were obtained by differential centrifugation of plasma. The application of high-sensitivity fluorescence-activated vesicles sorting (hs-FAVS) using fluorophore-conjugated anti-CD41-FITC (Fluorescein isothiocyanate) and anti-CD235a-PE antibodies allowed the isolation of three subpopulations of EVs, namely CD41+ CD235a-, CD41-CD235a+ and CD41-CD235a dim. The high purity (>97%) of the sorted subpopulations was verified by high-sensitivity flow cytometry. Presence of nanosized objects in sorted samples was confirmed by combination of low-voltage scanning electron microscopy and dynamic light scattering. The amount of material in sorted samples was enough to perform Quantitative polymerase chain reaction (qPCR)-based nucleic acid quantification. The most prominent differences in the nucleic acid repertoire were noted between CD41+ CD235- vs. CD41-CD235a+ vesicles: the former contained significantly (p = 0.004) higher amount of mitochondrial DNA, and platelet enriched miR-21-5p (4-fold), miR-223-3p (38-fold) and miR-199a-3p (187-fold), but lower amount of erythrocyte enriched miR-451a (90-fold). CD41-CD235a+ and CD41-CD235a dim vesicles differed in levels of miR-451a (p = 0.016) and miR-21-5p (p = 0.031). Nuclear DNA was below the limit of detection in all EV subpopulations. The hs-FCM-based determination of the number of sorted EVs allowed the calculation of per single-event miRNA concentrations. It was demonstrated that the most abundant marker in CD41+ CD235a- subpopulation was miR-223-3p, reaching 38.2 molecules per event. In the CD41-CD235+ subpopulation, the most abundant marker was miR-451a, reaching 24.7 molecules per event. Taken together, our findings indicate that erythrocyte- and platelet-derived EVs carry different repertoires of nucleic acids, which were similar to the composition of their cellular sources. [ABSTRACT FROM AUTHOR]
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- 2020
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19. Selective-Area Remote Epitaxy of ZnO Microrods Using Multilayer-Monolayer-Patterned Graphene for Transferable and Flexible Device Fabrications.
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Junseok Jeong, Dae Kwon Jin, Janghwan Cha, Bong Kyun Kang, Qingxiao Wang, Joonghoon Choi, Sang Wook Lee, Mikhailovskii, Vladimir Yu., Neplokh, Vladimir, Amador-Mendez, Nuño, Tchernycheva, Maria, Woo Seok Yang, Jinkyoung Yoo, Kim, Moon J., Suklyun Hong, and Young Joon Hong
- Published
- 2020
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20. Highly Ordered and Polycrystalline Graphene on Co(0001) Intercalated by Oxygen.
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Shevelev, Viktor O., Bokai, Kirill A., Makarova, Anna A., Marchenko, Dmitry, Vilkov, Oleg Yu., Mikhailovskii, Vladimir Yu., Vyalikh, Denis V., and Usachov, Dmitry Yu.
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- 2020
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21. Depth profiling by pulsed glow discharge time-of-flight mass spectrometry with a combined hollow cathode cell.
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Gubal, Anna, Chuchina, Victoria, Lyalkin, Yegor, Mikhailovskii, Vladimir, Yakobson, Viktor, Solovyev, Nikolay, and Ganeev, Alexander
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TIME-of-flight mass spectrometry ,CATHODES ,GLOW discharges ,DEPTH profiling ,SURFACE conductivity ,DIELECTRIC materials - Abstract
A combined hollow cathode microsecond direct current pulsed glow discharge time-of-flight mass spectrometry (CHC μs-DC-PGD TOFMS) system has proved its efficiency for quantification; however, it has not been properly tested for the purpose of depth analysis until now, to the best of the authors' knowledge. The aim of the current study was to investigate the capabilities of this glow discharge source type for depth profiling. Special attention was paid to the alteration of depth resolution during the sputtering and the effect of discharge parameters on the crater shape in different types of solid samples. Both dielectric and conductive samples were tested, including: a Ni film on silicon, a Si film on borosilicate glass, and IR-reflective dielectric multilayer (mirror) coatings. Crater shapes were investigated after combined hollow cathode cell sputtering to ensure reliable profiling. For dielectric materials, including multilayer coatings, the deposition of a thin conducting layer (Ag or Ta) on the sample surface was demonstrated to result in reliable sputtering with adequate depth resolution of the profiling. This preliminary sample coating provided both the formation of required surface conductivity and reduction of the negative effect of atmospheric gases and water surface contamination at the beginning of sample sputtering. A silicon-coated borosilicate glass specimen was tested for potential quantitative profiling, showing promising results. The CHC μs-DC-PGD TOFMS system used was capable of analyzing the layers of varied thickness in the range from tens of nanometers to several micrometers. The depth resolution was 5 nm and 25 nm for conducting and dielectric layers, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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22. Novel design strategy for GaAs‐based solar cell by application of single‐walled carbon nanotubes topmost layer.
- Author
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Mitin, Dmitry M., Bolshakov, Alexey D., Neplokh, Vladimir, Mozharov, Alexey M., Raudik, Sergei A., Fedorov, Vladimir V., Shugurov, Konstantin Yu., Mikhailovskii, Vladimir Yu., Rajanna, Pramod M., Fedorov, Fedor S., Nasibulin, Albert G., and Mukhin, Ivan S.
- Subjects
SILICON solar cells ,SOLAR cells ,CARBON nanotubes ,SOLAR cell efficiency ,SEMICONDUCTOR films ,ELECTRON transport ,LIGHT absorption - Abstract
Attempts to improve solar cells efficiency touch all its constituents and are directly related to their fabrication protocols. While the most promising material platform for high efficiency photovoltaic devices is still III‐V semiconductors, introduction of novel materials like single‐walled carbon nanotubes (SWCNTs), which are characterized by unique combination of conductivity and transparency, might greatly yield the device performance. Here, for the first time, we present the results of the fabrication and characterization of a thin‐film GaAs solar cell with a SWCNT top contact. We examine the contact between the SWCNT film and the semiconductor structure by means of the optical and electron beam‐induced current techniques. The fabricated device demonstrates better performance, that is, increased power conversion efficiency from 10.6% to 11.5% when compared to the cell with the traditional metal contact grid, stemming from the enhanced photocurrent collection efficiency and low parasitic light absorption in the emitter layer. We envision future prospects to exploit the multifunctionality of the SWCNTs in fabrication of highly efficient photovoltaic devices including flexible solar cells. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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23. Room-Temperature Lasing from Mie-Resonant Nonplasmonic Nanoparticles.
- Author
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Tiguntseva, Ekaterina, Koshelev, Kirill, Furasova, Aleksandra, Tonkaev, Pavel, Mikhailovskii, Vladimir, Ushakova, Elena V., Baranov, Denis G., Shegai, Timur, Zakhidov, Anvar A., Kivshar, Yuri, and Makarov, Sergey V.
- Published
- 2020
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24. Modified silicone rubber for fabrication and contacting of flexible suspended membranes of n-/p-GaP nanowires with a single-walled carbon nanotube transparent contact.
- Author
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Neplokh, Vladimir, Kochetkov, Fedor M., Deriabin, Konstantin V., Fedorov, Vladimir V., Bolshakov, Alexey D., Eliseev, Igor E., Mikhailovskii, Vladimir Yu., Ilatovskii, Daniil A., Krasnikov, Dmitry V., Tchernycheva, Maria, Cirlin, George E., Nasibulin, Albert G., Mukhin, Ivan S., and Islamova, Regina M.
- Abstract
Rubber materials are the key components of flexible optoelectronic devices, especially for the light-emitting diodes based on arrays of inorganic nanowires (NWs). This paper reports on polydimethylsiloxane-graft-polystyrene (PDMS-St) as a new flexible substrate of GaP NW array structures. The NWs were encapsulated by the newly introduced G-coating method to substitute the inefficient mainstream spin-coating. To further exploit the flexibility and the stretchability of the NW/PDMS-St structures, the ferrocenyl-containing polymethylhydrosiloxane was synthesized and successfully used as an electrode for the NWs. In order to make an alternative highly efficient transparent electrode, a new application of conductive single-walled carbon nanotubes was demonstrated. The novel materials and methods demonstrated unsurpassed mechanical stability of the fabricated flexible electronic devices. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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- View/download PDF
25. Application of high-sensitivity flow cytometry in combination with low-voltage scanning electron microscopy for characterization of nanosized objects during platelet concentrate storage.
- Author
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Fedorov, Anton, Kondratov, Kirill, Kishenko, Vasilii, Mikhailovskii, Vladimir, Kudryavtsev, Igor, Belyakova, Margarita, Sidorkevich, Sergey, Vavilova, Tatyana, Kostareva, Anna, Sirotkina, Olga, and Golovkin, Alexey
- Subjects
SCANNING electron microscopy ,FLOW cytometry ,ERYTHROCYTES ,BLOOD platelets ,EXTRACELLULAR vesicles - Abstract
Platelet concentrates are used in clinic for therapy and prophylaxis of conditions associated with platelet deficiency or malfunction. The characteristics of platelet concentrates gradually change during pretransfusion storage, affecting their clinical effectiveness and the risk of adverse transfusion reactions. The presence of platelet-derived membrane vesicles is an important characteristic of platelet concentrates. Due to their functionality, changes in the number and molecular compositions of platelet-derived vesicles have major effects on the clinical properties of platelet preparations. The existence of different subpopulations of membrane vesicles requires analytical methods capable of providing information at the individual vesicle level. Such methods include flow cytometry and electron microscopy. However, conventional flow cytometry has certain limitations, since the diameters of many platelet-derived membrane vesicles are smaller than its detection limit. The use of classical scanning electron microscopy is also limited due to the requirement for coating with a layer of conductive material, which impedes the detection of small extracellular vesicles. Here, a combination of high-sensitivity flow cytometry and low-voltage scanning electron microscopy was used to increase sensitivity and resolution in the detection of nanosized objects present in platelet concentrates during storage. Apheresis platelet concentrates from eight healthy adult donors were investigated on days 2 and 7 of storage. Fractions of nanosized objects were obtained by differential centrifugation. Fluorophore-conjugated antibodies were used to detect marker-positive vesicles derived from platelets (CD41), red blood cells (CD235a), leukocytes (CD45), and endothelial cells (VEGFR2). Near-spherical objects with diameters ranging from 25 to 700 nm were observed by low-voltage scanning electron microscopy in platelet concentrates and its fractions. On day 7 of storage, objects with diameters of less than 100 nm were attached to and clustered near the terminal ends of pseudopod-like projections. High-sensitivity flow cytometry showed that during storage numbers of CD41(pos) vesicles elevated more than fivefold and numbers of marker-negative nanosized objects, which did not carry any of the investigated cell type-specific markers elevated more than twofold. Major changes in both CD41(pos) vesicles and marker-negative nanosized objects abundances were observed for objects with diameters around 100 nm bead equivalents. Overall, these results emphasized the importance of application of high-sensitivity methods for monitoring the characteristics of cell-derived nanosized objects during platelet concentrate storage. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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26. Synthesis of Fe(OH)3 Microtubes at the Gas–Solution Interface and Their Use for the Fabrication of Fe2O3 and Fe Microtubes.
- Author
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Gulina, Larisa, Tolstoy, Valeri, Kuklo, Leonid, Mikhailovskii, Vladimir, Panchuk, Vitaly, and Semenov, Valentin
- Subjects
IRON oxides ,SOLUTION (Chemistry) ,AMORPHOUS substances ,VITAMIN C ,HYDROGEN ,CHEMICAL reactions ,AMMONIUM - Abstract
A straightforward and effective method is reported for obtaining microtubes of iron‐based compounds by interfacial interaction between a solution and gaseous reagents. A thin amorphous film of Fe(OH)
3 was synthesized on the surface of a mixed FeCl2 /FeCl3 /ascorbic acid aqueous solution as a result of the interaction with gaseous ammonium. When dried in air, the film was oxidized and transformed into microtubes. These Fe(OH)3 microtubes were converted into α‐Fe2 O3 ones by annealing in air. As a result of thermal hydrogen reduction, α‐Fe microtubes were formed. Both the annealing in air and reduction in a hydrogen flow at a temperature of 1,000 °C preserve the tubular morphology of the product. The microtubes synthesized were characterized by optical and scanning microscopy, structural and compositional analyses, and Mössbauer spectroscopy. A hypothesis is proposed about the model of microtube formation resulting from the chemical reaction at the gas–solution interface. [ABSTRACT FROM AUTHOR]- Published
- 2018
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27. Highly Reversible Water Oxidation at Ordered Nanoporous Iridium Electrodes Based on an Original Atomic Layer Deposition.
- Author
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Schlicht, Stefanie, Haschke, Sandra, Mikhailovskii, Vladimir, Manshina, Alina, and Bachmann, Julien
- Subjects
OXIDATION ,NANOPOROUS materials ,IRIDIUM ,OXIDE electrodes ,ATOMIC layer deposition - Abstract
Abstract: Nanoporous iridium electrodes are prepared and electrochemically investigated towards the water oxidation (oxygen evolution) reaction. The preparation is based on ‘anodic’ aluminum oxide templates, which provide straight, cylindrical nanopores. Their walls are coated using atomic layer deposition (ALD) with a newly developed reaction which results in a metallic iridium layer. The ALD film growth is quantified by spectroscopic ellipsometry and X‐ray reflectometry. The morphology and composition of the electrodes are characterized by scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, and X‐ray diffraction. Their catalytic activity is quantified for various pore geometries by cyclic voltammetry, steady‐state electrolysis, and electrochemical impedance spectroscopy. With an optimal pore length of
L ≈17–20 μm, we achieve current densities ofJ =0.28 mA cm−2 at pH 5 andJ =2.4 mA cm−2 at pH 1. This platform is particularly competitive for achieving moderate current densities at very low overpotentials, that is, for a high degree of reversibility in energy storage. [ABSTRACT FROM AUTHOR]- Published
- 2018
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28. Phylogenetic position and morphology of Raphidiophrys elongata sp. nov. (Haptista: Centroplasthelida) with notes on cyst wall structure and evolution.
- Author
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Drachko, Daria, Mikhailovskii, Vladimir, Shishkin, Yegor, and Zlatogursky, Vasily V.
- Subjects
MORPHOLOGY ,TROPHOZOITES ,SUTURING ,SPECIES - Abstract
The majority of centrohelids bear external coverings consisting of organic spicules or siliceous scales. Cyst coverings are usually reinforced with additional layers of modified scales. The cyst wall of Raphidiophrys heterophryoidea has an unusual and complex structure. It consists of three different types of scales and includes the mosaic scale layer not known in other centrohelids. During excystment, the cyst wall fragments along the sutures of the mosaic layer. For other Raphidiophrys species, cyst coverings are not studied. The present paper describes a new Raphidiophrys species, R. elongata , belonging to the NC7 environmental clade. Trophozoites bore thin plate scales with reduced upper plate. Under starvation, cysts emerged in clonal cultures. Cyst coverings of R. elongata and R. heterophryoidea were studied in comparison with the use of FIB-SEM. Cyst wall of R. elongata was significantly thinner than in R. heterophryoidea and was formed with 3–5 layers of uniform overlapping scales. No mosaic scale layer was present. During excystment, trophozoite exited cyst shell through random fissure. Possible evolutionary events and driving forces behind the complication of cyst wall within Raphidiophrys were discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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29. Optical Studies and Transmission Electron Microscopy of HgCdTe Quantum Well Heterostructures for Very Long Wavelength Lasers.
- Author
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Rumyantsev, Vladimir V., Razova, Anna A., Bovkun, Leonid S., Tatarskiy, Dmitriy A., Mikhailovskii, Vladimir Y., Zholudev, Maksim S., Ikonnikov, Anton V., Uaman Svetikova, Tatyana A., Maremyanin, Kirill V., Utochkin, Vladimir V., Fadeev, Mikhail A., Remesnik, Vladimir G., Aleshkin, Vladimir Y., Mikhailov, Nikolay N., Dvoretsky, Sergey A., Potemski, Marek, Orlita, Milan, Gavrilenko, Vladimir I., and Morozov, Sergey V.
- Subjects
TRANSMISSION electron microscopy ,LIGHT transmission ,QUANTUM wells ,HETEROSTRUCTURES ,ELECTRON-hole recombination ,PHOTOLUMINESCENCE measurement ,TOPOLOGICAL insulators - Abstract
HgTe/CdHgTe quantum well (QW) heterostructures have attracted a lot of interest recently due to insights they provided towards the physics of topological insulators and massless Dirac fermions. Our work focuses on HgCdTe QWs with the energy spectrum close to the graphene-like relativistic dispersion that is supposed to suppress the non-radiative Auger recombination. We combine various methods such as photoconductivity, photoluminescence and magneto-optical measurements as well as transmission electron microscopy to retrofit growth parameters in multi-QW waveguide structures, designed for long wavelengths lasing in the range of 10–22 μm. The results reveal that the attainable operating temperatures and wavelengths are strongly dependent on Cd content in the QW, since it alters the dominating recombination mechanism of the carriers. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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30. Bright Single-Photon Emitters with a CdSe Quantum Dot and Multimode Tapered Nanoantenna for the Visible Spectral Range.
- Author
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Rakhlin, Maxim, Sorokin, Sergey, Kazanov, Dmitrii, Sedova, Irina, Shubina, Tatiana, Ivanov, Sergey, Mikhailovskii, Vladimir, Toropov, Alexey, and Mysliwiec, Jarosław
- Subjects
FREE-space optical technology ,SUBSTRATE integrated waveguides ,MOLECULAR beam epitaxy ,FOCUSED ion beams ,OPTICAL pumping ,QUANTUM dots - Abstract
We report on single photon emitters for the green-yellow spectral range, which comprise a CdSe/ZnSe quantum dot placed inside a semiconductor tapered nanocolumn acting as a multimode nanoantenna. Despite the presence of many optical modes inside, such a nanoantenna is able to collect the quantum dot radiation and ensure its effective output. We demonstrate periodic arrays of such emitters, which are fabricated by focused ion beam etching from a II-VI/III-V heterostructure grown using molecular beam epitaxy. With non-resonant optical pumping, the average count rate of emitted single photons exceeds 5 MHz with the second-order correlation function g (2) (0) = 0.25 at 220 K. Such single photon emitters are promising for secure free space optical communication lines. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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31. Nanosecond-Laser Generation of Nanoparticles in Liquids: From Ablation through Bubble Dynamics to Nanoparticle Yield.
- Author
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Kudryashov, Sergey I., Samokhvalov, Andrey A., Nastulyavichus, Alena A., Saraeva, Irina N., Mikhailovskii, Vladimir Y., Ionin, Andrey A., and Veiko, Vadim P.
- Subjects
NANOPARTICLES ,NANOSTRUCTURED materials ,LASER ablation ,LIQUIDS ,COLLOIDS - Abstract
A comprehensive picture of the nanosecond-laser generation of colloidal nanoparticles in liquids is nowadays the demand of their high-throughput industrial fabrication for diverse perspective biomedical, material science, and optoelectronic applications. In this study, using silicon as an example, we present a self-consistent experimental visualization and theoretical description of key transient stages during nanosecond-laser generation of colloidal nanoparticles in liquids: plasma-mediated injection of ablated mass into the liquid and driving the vapor bubble, finalized by the colloid appearance in the liquid. The explored fundamental transient stages envision the basic temporal and spatial scales, as well as laser parameter windows, for the demanded high-throughput nanosecond-laser generation of colloidal nanoparticles in liquids. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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32. Resonant Silicon Nanoparticles for Enhanced Light Harvesting in Halide Perovskite Solar Cells.
- Author
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Furasova, Aleksandra, Calabró, Emanuele, Lamanna, Enrico, Tiguntseva, Ekaterina, Ushakova, Elena, Ubyivovk, Eugene, Mikhailovskii, Vladimir, Zakhidov, Anvar, Makarov, Sergey, and Di Carlo, Aldo
- Abstract
Implementation of resonant nanoparticles (NPs) for improving performance of organometal halide perovskites solar cells is highly prospective approach, because it is compatible with the solution processing techniques used for any organic materials. Previously, resonant metallic NPs have been incorporated into perovskite solar cells for better light absorption and charge separation. However, high inherent optical losses and high reactivity of noble metals with halides in perovskites are main limiting factors for this approach. Incidentally, low‐loss and chemically inert resonant silicon NPs allow for light trapping and enhancement at nanoscale, being suitable for thin film photovoltaics. Here photocurrent and fill‐factor (FF) enhancements in meso‐superstructured perovskite solar cells, incorporating resonant silicon NPs between mesoporous TiO2 transport and active layers, are demonstrated. This results in a boost of device efficiency up to 18.8% and FF up to 79%, being a record among the previously reported values on NPs incorporation into CH3NH3PbI3 perovskite‐based solar cells. Theoretical modeling and optical characterization reveal the significant role of Si NPs for increased light absorption in the active layer rather than for better charge separation. The proposed strategy is universal and can be applied in perovskite solar cells with various compositions, as well as in other optoelectronic devices. A novel strategy for boosting the efficiency of organometal perovskite solar cells is proposed, based on resonant silicon nanoparticles (NPs) incorporated between photoactive and transport layers. The device efficiency is increased up to 18.8% and fill factor up to 79%, being a record among the previously reported results on NPs incorporation into standard CH3NH3PbI3 (MAPbI3) perovskite‐based solar cells. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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33. Cover Feature: Highly Reversible Water Oxidation at Ordered Nanoporous Iridium Electrodes Based on an Original Atomic Layer Deposition (ChemElectroChem 9/2018).
- Author
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Schlicht, Stefanie, Haschke, Sandra, Mikhailovskii, Vladimir, Manshina, Alina, and Bachmann, Julien
- Subjects
ELECTROCHEMICAL analysis ,IRIDIUM ,ATOMIC layer deposition ,PERIODICALS - Published
- 2018
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34. Dynamic all-optical control in ultrashort double-pulse laser ablation.
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Kudryashov, Sergey I., Samokhvalov, Andrey A., Golubev, Yaroslav D., Ivanov, Dmitry S., Garcia, Martin E., Veiko, Vadim P., Rethfeld, Baerbel, and Mikhailovskii, Vladimir Yu.
- Subjects
- *
LASER ablation , *ULTRA-short pulsed lasers , *FEMTOSECOND lasers , *ULTRASHORT laser pulses , *ALUMINUM films , *OPTICAL reflection , *THIN films - Abstract
• Double-pulse femtosecond laser ablation was performed on aluminum thin films. • Spallation thresholds raise with inter-pulse delays, preventing material removal. • Pump-probe experiments revealed the underlying physics of the raising thresholds. • Molecular Dynamics modeling is performed for Double-Pulse ablation experiments. • The analyzed temperature/pressure dynamics supported the experimental measurements. Double-pulse femtosecond laser ablation of thin aluminum films and bulk aluminum counterintuitively demonstrated a strong (60–70%) raise of the thickness-dependent thresholds for inter-pulse delays of 20–200 ps, preventing material removal at above-threshold fluencies. Time-resolved optical pump-probe reflection and double-pump transmission studies were performed and confirmed the variation of the ablation threshold depending on the interpulse delay. To support the experimental measurements, the process of double-pulse laser ablation was modelled with the combined atomistic-continuum model. The applied model can describe the laser-induced non-equilibrium phase transition processes at atomic precision, whereas the effect of free carriers, playing a determinant role for the case of ultrashort laser pulses, is accounted for in the continuum. The simulations revealed the underlying pre-ablative laser-induced stress dynamics in the hot, acoustically relaxed Al melt, crucially sensitive to the second pump-pulse compressive pressurization. The results of theoretical and experimental study enable efficient dynamic all-optical control of ultrafast laser ablation. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
35. GaNP-based photovoltaic device integrated on Si substrate.
- Author
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Dvoretckaia, Liliia N., Bolshakov, Alexey D., Mozharov, Alexey M., Sobolev, Maxim S., Kirilenko, Demid A., Baranov, Artem I., Mikhailovskii, Vladimir Yu, Neplokh, Vladimir V., Morozov, Ivan A., Fedorov, Vladimir V., and Mukhin, Ivan S.
- Subjects
- *
MOLECULAR beam epitaxy , *SCANNING transmission electron microscopy , *OPEN-circuit voltage , *BUFFER layers , *ENERGY conversion , *GALLIUM phosphide - Abstract
Gallium phosphide is an important material in terms of III-V semiconductors integration on Si. In this work we study photovoltaic properties of GaP:Be/GaNP (E g ~ 2.0eV)/GaP:Si p-i-n heterostructure grown on Si (100) with GaP buffer by plasma-assisted molecular beam epitaxy. Correlation between the structural and optoelectronic properties of the fabricated device was studied by scanning and transmission electron microscopy (TEM), electron beam induced current (EBIC) and deep-level transient spectroscopy (DLTS) techniques. The I–V characteristic of the fabricated mesa diode demonstrates short circuit current of 2.2 mA/cm2 and open circuit voltage of 0.8 V. TEM studies of the epilayer structural properties demonstrate high density of antiphase domains in the n-doped GaP buffer layer; however, they found to be annihilated in dilute nitride layer, where mainly threading dislocations were formed. EBIC investigation shows that crystalline imperfections of the heterostructure leads to poor carriers transport affecting the energy conversion efficiency. We performed numerical modeling concerning presence of the structural defects and discuss their influence on the diode performance. The carried out study is the initial step on the way to development of the growth technique of the GaP-based dilute nitride direct bandgap materials on Si for photonic and photovoltaic applications. • For the first time MBE-grown GaNP-based solar cell on Si is fabricated. • The fabricated device is thoroughly characterized with I–V, DLTS and EBIC measurements. • Theoretical model of the device is introduced to find out prospects for future development of the photovoltaic devices of the proposed design. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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36. Interface-Assisted Synthesis of the Mn 3- x Fe x O 4 Gradient Film with Multifunctional Properties.
- Author
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Gulina LB, Gurenko VE, Tolstoy VP, Mikhailovskii VY, and Koroleva AV
- Abstract
Anisotropic gradient materials are considered as promising and novel in that they have numerous functional properties and are able to transform into hierarchical microstructures. We report a facile method of gradient inorganic thin film synthesis through diffusion-controlled deposition at the gas-solution interface. To investigate the reaction of interfacial phase boundary controllable hydrolysis by gaseous ammonium, an aqueous solution of FeCl
3 and MnCl2 was chosen, as the precipitation pH values for the hydroxides of these metals differ gradually. As a result of synthesis using the gas-solution interface technique (GSIT), a thin film is formed on the surface of the solution that consists of Mn2+ (Fe,Mn)2 3+ O4 nanoparticles with hausmannite crystal structure. The ratio between iron and manganese in the film can be adjusted over a wide range by varying the synthetic procedure. Specific conditions are determined that allow the formation of a Mn-Fe mixed oxide film with a gradient of composition, morphology, and properties, as well as its further transformation into microscrolls with a diameter of 10-20 μm and a length of up to 300 μm, showing weak superparamagnetic properties. The technique reported provides a new interfacial route for the development of functional gradient materials with tubular morphology.- Published
- 2019
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37. Nanoporous water oxidation electrodes with a low loading of laser-deposited Ru/C exhibit enhanced corrosion stability.
- Author
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Haschke S, Pankin D, Mikhailovskii V, Barr MKS, Both-Engel A, Manshina A, and Bachmann J
- Abstract
For the oxidation of water to dioxygen, oxide-covered ruthenium metal is known as the most efficient catalyst, however, with limited stability. Herein, we present a strategy for incorporating a Ru/C composite onto a novel nanoporous electrode surface with low noble metal loading and improved stability. The Ru/C is coated on the pore walls of anodic alumina templates in a one-step laser-induced deposition method from Ru
3 (CO)12 solutions. Scanning electron microscopy proves the presence of a continuous Ru/C layer along the inner pore walls. The amorphous material consists of metallic Ru incorporated in a carbonaceous C matrix as shown by X-ray diffraction combined with Raman and X-ray photoelectron spectroscopies. These porous electrodes reveal enhanced stability during water oxidation as compared to planar samples at pH 4. Finally, their electrocatalytic performance depends on the geometric parameters and is optimized with 13 μm pore length, which yields 2.6 mA cm-2 , or 49 A g-1 , at η = 0.20 V.- Published
- 2019
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- View/download PDF
38. Copper-Stabilized Si/Au Nanowhiskers for Advanced Nanoelectronic Applications.
- Author
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Maksimova KY, Kozlov AA, Shvets PV, Koneva UY, Yurkevich OV, Lebedev OI, Vyvenko OF, Mikhailovskii VY, and Goikhman AY
- Abstract
We report here the growth and functional properties of silicon-based nanowhisker (NW) diodes produced by the vapor-liquid-solid process using a pulsed laser deposition technique. For the first time, we demonstrate that this method could be employed to control the size and shape of silicon NWs by using a two-component catalyst material (Au/Cu ≈ 60:1). During the NW growth, copper is distributed on the outer surface of the NW, whereas gold sticks as a droplet to its top. The length of NWs is defined by the total amount of copper in the catalyst alloy droplet. The measurements of the electrical transport properties revealed that in contact with the substrate, individual NWs demonstrate typical I - V diode characteristics. Our approach can become an important new tool in the design of novel electronic components., Competing Interests: The authors declare no competing financial interest.
- Published
- 2018
- Full Text
- View/download PDF
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