A5048599055- Organic and Molecular Conductors Research
- Magnetism in coordination complexes
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Molecular Junctions and Nanostructures
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Semiconductor materials and devices
- Solid-state spectroscopy and crystallography
- Transition Metal Oxide Nanomaterials
- Inorganic Chemistry and Materials
- Nanocluster Synthesis and Applications
- Magneto-Optical Properties and Applications
- Iron-based superconductors research
- Conducting polymers and applications
- Carbon Nanotubes in Composites
- High-pressure geophysics and materials
- Graphene research and applications
- Superconductivity in MgB2 and Alloys
- Gas Sensing Nanomaterials and Sensors
- Microwave Dielectric Ceramics Synthesis
- Chalcogenide Semiconductor Thin Films
- Copper Interconnects and Reliability
- Advanced Electron Microscopy Techniques and Applications
- Ion channel regulation and function
- Connexins and lens biology
V.E. Lashkaryov Institute of Semiconductor Physics
2006-2024
National Academy of Sciences of Ukraine
1993-2022
Institute of Software Systems
2009
Chuiko Institute of Surface Chemistry
1991-2003
The University of Tokyo
2003
Tokyo University of Science
2003
Russian Academy of Sciences
1994
The great interest in VO2, which has stimulated a large number of studies and publications recent decades, is caused by the reversible metal-insulator phase transition (MIT) that occurs at T = 68 °C accompanied transformation low-temperature dielectric (semiconductor) monoclinic into high-temperature metallic with rutile structure. Despite ongoing discussion about physical mechanism this transition, concomitant rapid change electrical optical characteristics material several orders magnitude...
des établissements d'enseignement et de recherche français ou étrangers, laboratoires publics privés.
Методом iнтерференцiйної фотолiтографiї на рельєфоутворюючих халькогенiдних шарах As10Ge30S60 сформовано два типи бiґраток з латерально-впорядкованими куполами та лунками. Покриття таких шарами алюмiнiю (80 нм), срiбла (70 нм) золота (10 дозволило отримати SERS пiдкладинок. атомної силової мiкроскопiї дослiджено змiни морфологiї поверхонь пiдкладинок в процесi їх формування. Показано, що перiоди обох типiв становлять ∼1200 нм, глибини лунок i висоти куполiв дорiвнюють ∼350 нм. Наступне...
Formation of an insulating ground state in the salt $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{I}$ was studied by measuring temperature dependence electronic transport properties (the anisotropy resistivity, thermopower along principal in-plane directions, and Hall effect) x-ray diffraction patterns. Qualitative agreement all with metallic predicted band structure calculation found above 230 K....
The introduction of colloidal single-layer carbon nitride (SLCN) nanosheets at the stage formation Au nanocrystals (NCs) in aqueous solutions allows surface plasmon resonance peak position gold/SLCN composites to be tuned a relatively broad range 520-610 nm. effect is believed originate from strong electronic interaction between NCs and SLCN attached their as capping ligands resulting decrease effective electron density on NC surface. suppress direct interparticle interactions prohibiting...
Abstract Theoretical and experimental vibrational spectra of ReSe 2 nanocrystals, synthesized by self‐limited chemical vapor deposition (CVD), are reported. Scanning electron microscopy reveals that the nanocrystals have shape polygon nanoplates (NPs), 20 nm thick about 100–300 wide. X‐ray diffraction studies determined their triclinic structure (space group, P‐1 [no. 2]). The wavenumbers Raman‐ infrared (IR)‐active phonon modes were calculated using density functional perturbation theory...
A cubic-to-hexagonal phase transition in Si nanocrystals (NCs) is observed situ by recording their Raman and photoluminescence (PL) spectra simultaneously. The formation of the hexagonal structure concluded from appearance characteristic peaks intense PL with spectral positions reported previously for Si. occurs due to heating NCs laser beam, but it supposed be a photo-induced effect, as does not occur consequence solely thermal heating. Both structural concomitant switching bright emission...
We present a detailed study of the electron magnetic resonance (EMR) properties Ni nanoparticles (NPs) placed in bundles single-walled carbon nanotubes produced by arc discharge with catalyst. The behavior EMR signals has been investigated 10–300K temperature range for initial powderlike materials and those diluted nonmagnetic matrix. response evolves between two modes, ferromagnetic superparamagnetic, depending on both distribution sample. spectra shows that retain character NP ensemble...
Poly(ortho-anisidine) (POA)/single-walled carbon nanotubes (SWCNTs) composite films have been prepared by means of oxidative potentiostatic electropolymerization the monomer (ortho-anisidine) in presence purified SWCNTs. The magnetic properties obtained investigated electron spin resonance (ESR) (ν ≅ 9.4 GHz ; temperature range 10–300 K) and compared with those pure POA same oxidation state. similarity ESR signals dependence on line features suggest a polaron origin paramagnetic states. A...
A controllable variation of the photoluminescence (PL) intensity semiconductor quantum dots (QDs) via their coupling to plasmonic nanoparticles (NPs) is potential basis for optoelectronic and sensing applications. In this work, effect Au NPs on PL colloidal CdTe QDs investigated in solution solid films. An enhancement synthesized water was observed case spectral overlap plasmon absorption band QD band. dimethyl sulfoxyl trend reduction intensity. For reference samples prepared by mixing not...
The paper reports the formation of GeSn:C films on silicon substrates by thermal spraying Ge/Sn superlattices followed implantation C+ ions into them and annealing at 350 °C. It is shown that compared to Ge films, crystallization temperature which 500 °C, GeSn significantly reduced, down 300 respectively. We explain this effect diffusion tin atoms in lattice, decreases activation energy process. Implantation a superlattice reduces Sn process and, accordingly, increases temperature. have...
Vanadium oxide thin films were fabricated using a multi-step deposition process involving magnetron sputtering and sequential annealing. The structural, vibrational, nanomechanical properties of the investigated to elucidate impact phase composition on performance metal-insulator transition (MIT). X-ray diffraction (XRD) Raman spectroscopy revealed structural evolution from quasi-amorphous nanocrystalline phases upon annealing, with transitions VO₂ textured V₄O₉ dominating annealing process....