A5004920262- Graphene research and applications
- Topological Materials and Phenomena
- Advanced NMR Techniques and Applications
- Material Dynamics and Properties
- 2D Materials and Applications
- Zeolite Catalysis and Synthesis
- Advanced Condensed Matter Physics
- nanoparticles nucleation surface interactions
- Phase-change materials and chalcogenides
- Solid-state spectroscopy and crystallography
- Crystallography and Radiation Phenomena
- Ion-surface interactions and analysis
- NMR spectroscopy and applications
- Glass properties and applications
- Chemical Synthesis and Characterization
- Conducting polymers and applications
- Theoretical and Computational Physics
- Ferroelectric and Piezoelectric Materials
- Mesoporous Materials and Catalysis
- Phase Equilibria and Thermodynamics
- Perovskite Materials and Applications
- Advanced Photocatalysis Techniques
- Acoustic Wave Resonator Technologies
- Advanced Battery Materials and Technologies
- Nonlinear Optical Materials Research
St Petersburg University
2015-2024
Institute of Physics
2017
Abstract Engineering the physics and chemistry of 2D materials is a key to unlock potential advanced e‐nose technologies limited by current semiconductor technologies. Herein, adjustment graphene's morphology, physics, gas sensing properties upon its carboxylation via developed photochemical method demonstrated. Formation matrices nanoscale holes yet with retention lamellar structure graphene layer signified introduction up 9.5 at% carboxyl groups. The impact applied on conduction mechanism...
Here, we report the results of our 1H nuclear magnetic resonance study dynamics water molecules confined in zeolites (mordenite and ZSM-5 structures) with hierarchical porosity (micropores zeolite lamella mesopores formed by amorphous SiO2 inter-lamellar space). (NMR) spectra show that experiences complex behavior within temperature range from 173 to 298 K. The dependence spin-lattice relaxation evidences presence three processes different activation energies: freezing (about 30 kJ/mol),...
The derivatization of graphene to engineer its band structure is a subject significant attention nowadays, extending the frames material applications in fields catalysis, sensing, and energy harvesting. Yet, accurate identification certain group effect on graphene's electronic an intricate question. Herein, we propose advanced fingerprinting epoxide hydroxyl groups layers via core-level methods reveal modification their valence (VB) upon introduction these oxygen functionalities. distinctive...
The photocatalytic activity of layered perovskite-like oxides in water splitting reaction is dependent on the hydration level and species located interlayer slab: simple or complex cations as well hydrogen-bonded non-hydrogen-bonded H2O. To study proton localization dynamics HCa2Nb3O10·yH2O photocatalyst with different levels (hydrated—α-form, dehydrated—γ-form, intermediate—β-form), complementary Nuclear Magnetic Resonance (NMR) techniques were applied. 1H Magic Angle Spinning NMR evidences...
NMR studies of the thermal evolution Ga-In-Sn and Ga-In liquid alloys embedded into opal matrices were carried out. Temperature dependences gallium lineshape, shift resonance frequency (Knight shift), intensity obtained upon cooling down to alloy freezing subsequent warming. A second high-frequency 71Ga signal emerged for both cooling, line transferring gradually this additional signal. The Knight shifts signals differed noticeably. transformations warming continuous not affected by changes...
23Na NMR studies of sodium nanoparticles confined to porous glass with the 3.5 nm mean pore size were carried out. The emergence second component line was observed below 240 K that evidences occurrence another modification metallic sodium. phase transition temperature is much higher than martensite transformation in bulk
Ferroelectricity was studied for the nanocomposites consisted of KDP loaded MCM-41 molecular sieves and porous glass with pore sizes 3.8 7 nm, respectively. Studies were carried out by NMR dielectric techniques. The ferroelectric phase transition in nanocomposite shifted 0.4 K to high temperature, while not found. different behavior ascribed impact interparticle coupling. 31P MAS measurements showed that isotropic chemical shift at room temperature same bulk KDP. This result confirmed...
The tungsten ditelluride WTe2 was suggested to belong the Weyl semimetal family. We studied 125Te spin-lattice relaxation and NMR spectra in a single crystal within large range from 28 K up room temperature. Measurements were carried out on Bruker Avance 500 pulse spectrometer for crystalline c axis directed parallel perpendicular magnetic field. Relaxation proved be single-exponential. time varied depending sample position field frequency offset. rate increased about linearly with...