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Resolution and contrast enhancement of laser-scanning multiphoton microscopy using thulium-doped upconversion nanoparticles

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Nano Research 2019年第12期12卷 2933-2940页

作者： Alexey B.Kostyuk artem d.vorotnov Andrey V.Ivanov Arthur B.Volovetskiy Aleksandr V.Kruglov Lyudmila M.Sencha Liuen Liang Evgenii L.Guryev Vladimir A.Vodeneev Sergey M.deyev Yiqing Lu Andrei V.Zvyagin Lobachevsky State University of Nizhny Novgorod Nizhny Novgorod 603950Russia Center of Biomedical Engineering Institute of Molecular MedicineSechenov UniversityMoscow 119991Russia ARC Centre of Excellence"Nanoscale BioPhotonics" Department of Physics and AstronomyMacquarie UniversitySydney 2109Australia Institute ofBioorganic Chemistry Russian Academy of SciencesMoscow 117997Russia

High-contrast optical imagi ng is achievable using phosphoresce nt labels to suppress the short-lived background due to the optical backscatterand autofluoresce ***,the long-lived phosphorescence is generally incompatible with high-speed laser-scan ning imaging ***,we show that upc on versi on nan oparticles of structure NaYF4:Yb co-doped with 8%Tm(8T-UCNP)in combi nation with a commerciallaser-scanning multiphoton microscopy are uniquely suited for labeling biological systems to acquire high-resolution images with the enhancedcon *** comparison with many phosphoresce nt labels,the 8T-UCNP emission lifetime of-15μs affords rapid image ***-order optical nonlinearity of the 8T-UCNP(n=4,as confirmed experimentally and theoretically)afforded pushing the resolution limitattain able with UCNPs to the *** contrast enha nceme nt was achieved by suppressing the backgro und using(i)ban dpassspectral filtering of the narrow emission peak of 8T-UCNP at 455-nm,and(ii)time-gating implemented with a time-correlated single-photon counting system that demonstrated the contrast enhancement of>2.5-fold of polyethyle neimine-coated 8T-UCNPs take n up by huma nbreast adeno carcinoma cells *** a result,discrete 8T-UCNP nan oparticles became clearly observable in the freshly excised splee ntissue of laboratory mice 15-min post in trave nous injectio n of an 8T-UCNP *** dem on strated approach paves the way forhigh-contrast,high-resoluti on,and high-speed multiphot on microscopy in challe nging envir onments of i ntense autofluorescence,exogenous staining,and turbidity,as typically occur in intravital imaging.

关键词： upconversion nanoparticles autofluorescence time-gated imaging scanning microscopy time-correlated single photon counting

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Man-made plutonium radioisotopes in the salt lakes of the Crimean peninsula

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Journal of Oceanology and Limnology 2018年第6期36卷 1917-1929页

作者： TERESHCHENKO Nataliya N PROSKURNIN Vladislav Yu PARASKIV artem A. CHUZHIKOVA-PROSKURNINA Olga d. The A.O.Kovalevsky Institute of Marine Biological Research of the Russian Academy of Sciences Sevastopol 299011Russian Federation

Investigations of ^(239+240)Pu and ^(238)Pu in the surface layer(0–5 cm) of bottom sediment in the Crimean 10 salt lakes from 4 geographical groups were carried out for the first time. The ^(239+240)Pu varied widely between regional geographical groups of lakes as well as within groups too and ranged from 11±4 to 451±43 mBq^(239+240)Pu/kg. The highest levels of ^(239+240)Pu—419±27, 443±24 and 451±43 mBq/kg were observed in the Yevpatoriya(Lake Kyzyl-Yar), the Tarkhankut(dzharylhach) and the Kerch group(Tobechik), respectively. The lowest values of ^(239+240)Pu were identified in three lakes of the Perekop group and were 20±12, 24±6 and 48±6 mBq/kg. In all lakes ^(238)Pu was an order of magnitude lower than 239+240 Pu and varied from 4.8±2.6 to 30.7±5.5 mBq/kg. The ^(238)Pu activity was decay-corrected to 1986. The characteristic ratio of the ^(238)Pu/239+240 Pu activities in the sediment and percentage of the Chernobyl-derived Pu was calculated. The largest percentages of the Chernobyl-derived Pu were observed in the Evpatoriya group(Lake SasykSivash)—16.2%±8.26%, the Tarkhankut group(dzharylhach)—8.4%±2.10% and the Kerch group(Aktash)—10.5%±5.56%. The study of the depth distribution of plutonium in the Lake Kyzyl-Yar bottom sediment core(0–25 cm) was fulfilled. It was shown that 239+240 Pu was high enough in all studied layers of bottom sediment, but the highest activity ratio ^(238)Pu/239+240 Pu(0.062±0.020) was found in the deepest layer of 15–20.5 cm and the percentage of Chernobyl-derived Pu was estimated at 6.8%±2.85% in this layer.

关键词： plutonium radioisotopes 238,239+240 Pu bottom sediments global fallout Chernobyl accident Crimean salt lakes

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Electrical Excitation of Long-Range Surface Plasmons in PC/OLEd Structure with Two Metal Nanolayers

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Nano-Micro Letters 2020年第3期12卷 69-76页

作者： Valery Konopsky Valery Prokhorov dmitry Lypenko artem dmitriev Elena Alieva Giovanni dietler Sergey Sekatskii Institute of Spectroscopy Russian Academy of SciencesFizicheskaya5TroitskMoscowRussia 108840 Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences Leninsky pr.31/4MoscowRussia 119071 Laboratoire de Physique de La Matière Vivante IPHYSEcole Polytechnique Fédérale de Lausanne1015 LausanneSwitzerland

A current-driven source of long-range surface plasmons(LRSPs)on a duplex metal nanolayer is *** excitation of LRSPs was experimentally observed in a planar structure,where an organic light-emitting film was sandwiched between two metal nanolayers that served as *** achieve the LRSP propagation in these metal nanolayers at the interface with air,the light-emitting structure was bordered by a one-dimensional photonic crystal(PC)on the other *** dispersion of the light emitted by such a hybrid PC/organic-light-emitting-diode structure(PC/OLEd)comprising two thin metal electrodes was obtained,with a clearly identified LRSP resonance peak.

关键词： Surface plasmons Photonic crystal waveguides Light-emitting polymers

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Scalable nanocomposite parylene-based memristors:Multifilamentary resistive switching and neuromorphic applications

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Nano Research 2023年第2期16卷 3207-3214页

作者： Anna N.Matsukatova artem Yu.Vdovichenko Timofey d.Patsaev Pavel A.Forsh Pavel K.Kashkarov Vyacheslav A.demin Andrey V.Emelyanov National Research Centre“Kurchatov Institute” Moscow 123182Russia Physics department Lomonosov Moscow State UniversityMoscow 119991Russia Moscow Institute of Physics and Technology DolgoprudnyjMoscow oblast 141701Russia Enikolopov Institute of Synthetic Polymeric Materials Russian Academy of SciencesMoscow 117993Russia Physics department Saint Petersburg State UniversitySt.Petersburg 199034Russia

Memristors are promising candidates for synapse emulation in brain-inspired neuromorphic computing *** main obstacle to their usage in such systems is high variability of memristive characteristics and its severe negative effect on the neural network *** paper addresses the issue from two points of view on the example of the parylene-based memristors:(i)the methods of the memristor internal stochasticity decrease and(ii)the methods of the memristive neural network architecture *** introduction of an optimal Ag nanoparticle concentration(3 vol.%–6 vol.%)to the memristive structure leads to a statistically significant decrease in the switching voltage variation and endurance ***,it is shown that post-fabrication annealing improves memristive characteristics,e.g.,resistive switching window increases by an order of magnitude and exceeds 106,the switching voltage variation decreases by a factor of 2(down to 7%for the set and 17%for the reset voltage),and thermostability is *** transmission electron microscopy and impedance spectroscopy analysis allowed establishing a multifilamentary resistive switching mechanism for nanocomposite parylene-based *** simulation of the formal neural network based on these memristors demonstrates high classification accuracy with low variation for an important biomedical task,heart disease prediction,after careful feature selection and network architecture *** prospects of the controlled incorporation of the nanocomposite parylene-based memristors in neural networks are brightened by their scaling possibility in crossbar geometry.

关键词： memristor resistive switching neuromorphic computing parylene nanocomposite

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High-throughput systematic topological generation of low-energy carbon allotropes

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npj Computational Materials 2021年第1期7卷 126-132页

作者： Vladislav A.Blatov Changhao Yang dingyi Tang Qingfeng Zeng Andrey A.Golov artem A.Kabanov School of Materials Science and Engineering Northwestern Polytechnical UniversityYouyi West Rd.127Xi’an 710072PR China Samara Center for Theoretical Materials Science(SCTMS) Samara State Technical UniversityMolodogvardeyskaya St.244Samara 443100Russia Samara Center for Theoretical Materials Science(SCTMS) Samara UniversityAc.Pavlov St.1Samara 443011Russia MSEA International Institute for Materials Genome Jinxiu Rd.1Gu’an 065500PR China Samara Branch ofР.N.Lebedev Physical Institute of the Russian Academy of Sciences Novo-Sadovaya St.221443011 SamaraRussia

The search for new materials requires effective methods for scanning the space of atomic configurations,in which the number is *** we present an extensive application of a topological network model of solid-state transformations,which enables one to reduce this infinite number to a countable number of the regions corresponding to topologically different crystalline *** have used this model to successfully generate carbon allotropes starting from a very restricted set of initial structures;the generation procedure has required only three steps to scan the configuration space around the *** a result,we have obtained all known carbon structures within the specified set of restrictions and discovered 224 allotropes with lattice energy ranging in 0.16–1.76 eV atom^(−1) above diamond including a phase,which is denser and probably harder than *** have shown that this phase has a quite different topological structure compared to the hard allotropes from the diamond polytypic *** have applied the tiling approach to explore the topology of the generated phases in more detail and found that many phases possessing high hardness are built from the tiles confined by six-membered *** have computed the mechanical properties for the generated allotropes and found simple dependences between their density,bulk,and shear moduli.

关键词： carbon energy topological

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Crystal and electronic structure engineering of tin monoxide by external pressure

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Journal of Advanced Ceramics 2021年第3期10卷 565-577页

作者： Kun LI Junjie WANG Vladislav ABLATOV Yutong GONG NaotoUMEZAWA Tomofumi TAdA Hideo HOSONO artem ROGANOV State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China International Center for Materials discovery School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Samara Center for Theoretical Materials Science(SCTMS) Samara State Technical UniversitySamara 443100Russia Samara Center for Theoretical Materials Science(SCTMS) Samara UniversitySamara 443011Russia Semiconductor R&d Center Samsung ElectronicsGyeonggi-do 18448Republic of Korea Materials Research Center for Element Strategy Tokyo Institute of TechnologyKanagawa 226-8503Japan Skolkovo Institute of Science and Technology Moscow 143026Russia Moscow Institute of Physics and Technology Dolgoprudny 141700Russia

Although tin monoxide (SnO) is an interesting compound due to its p-type conductivity,a widespread application of SnO has been limited by its narrow band gap of 0.7 *** this work,we theoretically investigate the structural and electronic properties of several SnO phases under high pressures through employing van der Waals (vdW) *** calculations reveal that a metastable SnO (β-SnO),which possesses space group P2_(1)/c and a wide band gap of 1.9 eV,is more stable than α-SnO at pressures higher than 80 ***,a stable (space group P2/c) and a metastable (space group Pnma) phases of SnO appear at pressures higher than 120 *** and topological analyses show that P2/c-SnO has a high possibility to directly transform to β-SnO at around 120 *** work also reveals that β-SnO is a necessary intermediate state between high-pressure phase Pnma-SnO and low-pressure phase α-SnO for the phase transition path Pnma-SnO →β-SnO →α-*** phase transition analyses indicate that there is a high possibility to synthesize β-SnO under high-pressure conditions and have it remain stable under normal ***,our study reveals that the conductive property of β-SnO can be engineered in a low-pressure range (0-9 GPa)through a semiconductor-to-metal transition,while maintaining transparency in the visible light range.

关键词： tin monoxide van der Waals(vdW) topological relationship phase transition band gap

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Na,K-ATPase as a target for endogenous cardiotonic steroids:What’s the evidence?

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Genes & diseases 2021年第3期8卷 259-271页

作者： Sergei N.Orlov artem M.Tverskoi Svetlana V.Sidorenko Larisa V.Smolyaninova Olga d.Lopina Nickolai O.dulin Elizaveta A.Klimanova MV Lomonosov Moscow State University Moscow119234Russia National Research Tomsk State University Tomsk634050Russia Siberian State Medical University Tomsk634050Russia University of Chicago IL60637USA

With an exception of few reports,the plasma concentration of ouabain and mari-nobufagenin,mostly studied cardiotonic steroids(CTS)assessed by immunoassay techniques,is less than 1 *** the last 3 decades,the implication of these endogenous CTS in the path-ogenesis of hypertension and other volume-expanded disorders is widely *** threshold for inhibition by CTS of human and rodent a1-Na,K-ATPase is~1 and 1000 nM,respectively,that rules out the functioning of endogenous CTS(ECTS)as natriuretic hormones and regulators of cell adhesion,cell-to-cell communication,gene transcription and transla-tion,which are mediated by dissipation of the transmembrane gradients of monovalent *** several types of cells ouabain and marinobufagenin at concentrations corresponding to its plasma level activate Na,K-ATPase,decrease the[Na^(+)]i;/[K^(+)]i;-ratio and increase cell *** physiological significance and mechanism of non-canonical Na^(+)/K^(+)-depen-dent and Nai^(+)/Ki^(+)independent cell responses to CTS are discussed.

关键词： Cell proliferation Cellular signaling Endogenous cardiotonic steroids Na+,K+-ATPase Transcription Translation

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New luminescent 10-oxybenzoquinolate complexes of rare earth metals

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Journal of Rare Earths 2023年第8期41卷 1135-1143,I0001页

作者： Tatyana V.Balashova Svetlana K.Polyakova Vasily A.Ilichev Andrey A.Kukinov Roman V.Rumyantcev Georgy K.Fukin Ivan d.Grishin artem N.Yablonskiy Alexander F.Shestakov Mikhail N.Bochkarev G.A.Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina Street49603950Nizhny NovgorodRussian Federation Nizhny Novgorod State University Gagarina Avenue 23/2603950Nizhny NovgorodRussian Federation Institute for Physics of Microstructures of Russian Academy of Sciences Akademicheskaya Street 7603950Nizhny NovgorodRussian Federation Institute of Problems of Chemical Physics of Russian Academy of Sciences Academician Semenov Avenue1ChernogolovkaMoscow Region142432Russian Federation

A series of Sc,Y,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Ho,Er,Tm and Yb complexes with oxybenzoquinoline ligands(BQ) was synthesized by the reactions of 10-hydroxybenzo[h]quinoline with cyclopentadienides or tris(trimethylsilyl)amides of rare earth *** structure,as well as the photo-and electroluminescent(PL,EL) properties of these complexes in solutions and solid state were *** solutions,complexes of sodium and lanthanides exhibit double peaked ligand-centered PL of enol and keto forms of BQ with a quantum yield of 1%-8%.In the solid state the complexes of Sm,Eu,Ho,Nd,Er,and Yb along with the ligand-centered PL also exhibit a moderate-intensity metal-centered PL which is characteristic of the corresponding Ln^(3+) ***(BQ)_(3) complex shows bright green EL which has intensity comparable to the best results observed for scandium complexes with other organic ligands.

关键词： Lanthanides Photoluminescence(PL) Electroluminescence(EL) 10-hydroxybenzo[h]quinoline X-ray structure Organic light-emitting diodes(OLEds)

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Nickel phosphonate MOF as efficient water splitting photocatalyst

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Nano Research 2021年第2期14卷 450-457页

作者： Pablo Salcedo-Abraira Sergio M.F.Vilela artem A.Babaryk Maria Cabrero-Antonino Pedro Gregorio Fabrice Salles Sergio Navalon Hermenegildo Garcia Patricia Horcajada IMdEA Energy Advanced Porous Materials Unit(APMU)Avda.Ramon de Ia Sagra 3E 28935 MostolesMadridSpain deparrtamento de Quimica Inorginica I.Fac.CC.Quimicas Universidad Complutense de MadridAvda.Complutense s/n28040 MadridSpain departamento de Quimica and Instituto de Tecnologia Quimica(CSIC-UPV) Universitat Politecnica de ValenciaC/Camino de Veras/n46022 ValenciaSpain Institut Charles Gerhardt Montpellier UMR 5253 CNRS UM ENSCMUniversite MontpellierPlace E.Bataillon34095 Montpellier Cedex 05France

A novel microporous two-dimensional(2d)Ni-based phosphonate metal-organic framework(MOF;denoted as IEF-13)has been successfully synthesized by a simple and green hydrothermal method and fully characterized using a combination of experimental and computational *** resolution by single-crystal X-ray diffraction reveals that IEF-13 crystallizes in the triclinic space group Pi having bi-octahedra nickel nodes and a photo/electroactive tritopic phosphonate ***,this material exhibits coordinatively unsaturated nickel(II)sites,free-P0_(3)H_(2)and-P0_(3)H acidic groups,a C0_(2)accessible microporosity,and an exceptional thermal and chemical ***,its in-deep optoelectronic characterization evidences a photoresponse suitable for *** this sense,the photocatalytic activity for challenging H_(2)generation and overall water splitting in absence of any co-catalyst using UV-Vis irradiation and simulated sunlight has been evaluated,constituting the first report for a phosphonate-MOF ***-13 is able to produce up to 2,200 fimol of H_(2)per gram using methanol as sacrificial agent,exhibiting stability,maintaining its crystal structure and allowing its *** more,170μmol of H_(2)per gram were produced using IEF-13 as photocatalyst in the absence of any co-catalyst for the overall water splitting,being this reaction limited by the 0_(2)*** present work opens new avenues for further optimization of the photocatalytic activity in this type of multifunctional materials.

关键词： metal-organic framework phosphonates photocatalysis water splitting

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Stacking transition in rhombohedral graphite

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Frontiers of physics 2019年第1期14卷 67-73页

作者： Tataiana Latychevskaia Seok-Kyun Son Yaping Yang dale Chancellor Michael Brown Servet Ozdemir Ivan Madan Gabriele Berruto Fabrizio Carbone artem Mishchenko Kostya S. Novoselov Institute of Physics Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES)école Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne Switzerland National Graphene Institute University of Manchester Oxford Road Manchester M13 9PL UK School of Physics and Astronomy University of Manchester Oxford Road Manchester M13 9PL UK

Few-layer graphene (FLG) has recently been intensively investigated for its variable electronic properties, which are defined by a local atomic arrangement. While the most natural arrangement of layers in FLG is ABA (Bernal) stacking, a metastable ABC (rhombohedral) stacking, characterized by a relatively high-energy barrier, can also occur. When both types of stacking occur in one FLG device, the arrangement results in an in-plane heterostructure with a domain wall (dW). In this paper, we present two approaches to demonstrate that the ABC stacking in FLG can be controllably and locally turned into the ABA stacking. In the first approach, we introduced Joule heating, and the transition was characterized by 2d peak Raman spectra at a submicron spatial resolution. The transition was initiated in a small region, and then the dW was controllably shifted until the entire device became ABA stacked. In the second approach, the transition was achieved by illuminating the ABC region with a train of 790-nm-wavelength laser pulses, and the transition was visualized by transmission electron microscopy in both diffraction and dark-field imaging modes. Further, using this approach, the dW was visualized at a nanoscale spatial resolution in the dark-field imaging mode.

关键词： graphene graphite van der Waals heterostructures domain wall Raman spectroscopy transmission electron microscopy electron diffraction structural transition

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