A5042692743- Silicon Carbide Semiconductor Technologies
- GaN-based semiconductor devices and materials
- Gold and Silver Nanoparticles Synthesis and Applications
- nanoparticles nucleation surface interactions
- Glass properties and applications
- Photonic Crystals and Applications
- Advanced ceramic materials synthesis
- Crystallization and Solubility Studies
- Solidification and crystal growth phenomena
- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- Silicon Nanostructures and Photoluminescence
- Laser Material Processing Techniques
- Aluminum Alloys Composites Properties
- Plasmonic and Surface Plasmon Research
- Semiconductor materials and interfaces
- Quantum Dots Synthesis And Properties
- Luminescence Properties of Advanced Materials
- Diamond and Carbon-based Materials Research
- Thin-Film Transistor Technologies
- ZnO doping and properties
- Theoretical and Computational Physics
- Nonlinear Optical Materials Studies
- Metallurgical Processes and Thermodynamics
- Material Dynamics and Properties
Institute of Problems of Mechanical Engineering
2015-2024
St Petersburg University
2022
ITMO University
2018-2020
Peter the Great St. Petersburg Polytechnic University
2012-2019
Saint Petersburg Academic University
2014-2019
Russian Academy of Sciences
2014
Thermal poling of glasses induces structural and compositional modification breaks central symmetry these initially isotropic media. In spite numerous experimental data accumulated, little is known about the processes occurring in soft under this processing. We use micro-Raman technique to study formation interstitial molecular oxygen subsurface layer a soda-lime silicate glass course thermal poling. The presence O2 demonstrated cation-depleted subanodic region glass, thickness which depends...
Ensuring the stable operation of proton exchange membrane fuel cells is conducive to their real-world application. A promising direction for stabilizing electrodes stabilization ionomer via formation surface compounds with graphene. comprehensive study (electrochemical, chemical, and thermal) stability composites cell containing a modifying additive few-layer graphene was carried out. Electrochemical studied by cycling potential on disk electrode 5000 cycles. Chemical assessed resistance...
The mechanisms of nucleation and growth GaN films on porous silicon substrates with a buffer layer carbide grown by new method substitution atoms directly in the subsurface Si substrate were studied. P-type Si(111) plates deposited system periodic mesopores diameter 17 nm depth 1.5 μm used as for SiC layer. AlN layers thickness order 500 followed 5 HVPE SiC/Si prepared different ways. SEM micrographs, Raman photoluminescence spectra these samples are given. influence preparation conditions...
The growth of an arbitrary multicomponent crystal via the Burton–Cabrera–Frank mechanism due to chemical reaction is studied. rates advancement a single step, group equidistant steps, and step formed by screw dislocation on surface are analyzed for three cases: single-component reaction; from its vapors; reaction. It shown that cases very similar case vapor can be described same formulas as derived in classical paper Burton–Cabrera–Frank, while diffusion coefficient incorporation rate...
We present a study of resonant optical properties gold‐protected silver nanoisland films. Silver nanoislands were grown on glass substrate using out‐diffusion technique, the growth was followed by deposition nanometer‐thick gold coatings. Scanning electron microscopy and spectroscopy used to characterize morphology extinction spectra combined silver–gold nanostructures. Micro Raman has demonstrated their signal enhancement factor exceeding that one initial nanoislands.
Growth of self-assembled metal nanoislands on the surface silver ion-exchanged glasses via their thermal processing in hydrogen followed by out-diffusion neutral is studied. The combination poling glass with structured electrode and was used for simple formation separated groups several presenting plasmonic molecules. kinetics nanoisland temporal evolution size distribution poled unpoled are modeled.78.67.Sc (nanoaggregates; nanocomposites); 81.16.Dn (self-assembly); 68.35.bj (surface...
The possibility of practical realization a two‐stage chemical vapor deposition (CVD) process using as an example nanocomposite coating “molybdenum disulfide (filler)–silicon oxide (matrix)” is experimentally demonstrated for the first time. Deposition performed in two‐zone vertical tubular quartz reactor. formation molybdenum nanoparticles by spray pyrolysis carried out upper zone, and lower zone used coatings atmospheric pressure plasma‐enhanced CVD. An aerosol ammonium thiomolybdate...
We studied structuring of a soda-lime glass surface via electric field imprinting followed by chemical etching. The glasses were poled using anodic electrodes presenting patterned glassy carbon plate or chromium film deposited on the and structured with lithographic technique. poling resulted in modification composition structure region, deepening region because relaxation difference durability unpoled region. To fetch out influence atmosphere process part was covered 200 nm thick titania...
The paper is devoted to the growth of thin SiC films by method substitution atoms on macro- and mesoporous substrates p- n-type silicon (100) orientation. On Si polycrystalline 3C-SiC were formed, crystallite size determined from XRD patterns was 27.5 nm. obtained structures are studied methods scanning electron atomic-force microscopy, micro-Raman spectroscopy X-ray diffraction analysis.
New single crystals, based on 2-methylbenzimidazole (MBI), of MBI-phosphite (C16H24N4O7P2), MBI-phosphate-1 (C16H24N4O9P2), and MBI-phosphate-2 (C8H16N2O9P2) were obtained by slow evaporation method from a mixture alcohol solution MBI crystals water phosphorous or phosphoric acids. Crystal structures chemical compositions determined crystal X-ray diffraction (XRD) analysis confirmed XRD powders elemental analysis. Raman spectroscopy new evidences the presence in MBI-, H3PO3-, H3PO4-...