A5011519745- Graphene research and applications
- Porphyrin and Phthalocyanine Chemistry
- ZnO doping and properties
- Spectroscopy and Quantum Chemical Studies
- Diamond and Carbon-based Materials Research
- Surface Chemistry and Catalysis
- Quantum, superfluid, helium dynamics
- High-pressure geophysics and materials
- Fullerene Chemistry and Applications
- Advanced Photocatalysis Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Carbon Nanotubes in Composites
- Photoreceptor and optogenetics research
- Gas Sensing Nanomaterials and Sensors
- Covalent Organic Framework Applications
- Supercapacitor Materials and Fabrication
- Spectroscopy and Chemometric Analyses
- Semiconductor materials and devices
- Advanced Chemical Physics Studies
- Advancements in Battery Materials
- Polymer Nanocomposite Synthesis and Irradiation
- 2D Materials and Applications
- Free Radicals and Antioxidants
- Advanced Memory and Neural Computing
- Electrocatalysts for Energy Conversion
Institute of Microelectronics Technology and High Purity Materials
2010-2024
National Research Tomsk State University
2024
Institute of Problems of Chemical Physics
2023
National Yang Ming Chiao Tung University
2014-2020
Institute of Microelectronics
2019
Scientific Center of RAS in Chernogolovka
2018
Russian Academy of Sciences
2011
Lomonosov Moscow State University
2004-2009
Moscow State University
2006-2007
State Research Institute of Organic Chemistry and Technology
2007
Coupling between vibrational modes is essential for energy transfer and dissipation in condensed matter. For water, different O-H stretch are known to be very strongly coupled both within water molecules, leading ultrafast delocalization of energy. In contrast, the information on coupling H-O-H bending mode lacking, even though an intermediate relaxation pathway from heat bath. By combining static femtosecond infrared, Raman, hyper-Raman spectroscopies isotopically diluted with ab initio...
Abstract The signal in Raman spectroscopy has three components: vibrational bands, noise, and luminescence. Although the noise can be easily separated from bands either by a variety of algorithms or adjusting measurement conditions, to distinguish between luminescence peaks is challenging task. Even though number have been proposed for this purpose, most them show poor performance when applied broad overlapping with extended tails. A practical example such case found many carbon‐based...
Asymmetric lineshapes are experimentally observed in Raman spectra of different classes condensed matter. Determination the peak parameters, typically done with symmetric pseudo-Voigt functions, such situations yields unreliable results. While wide choice asymmetric fitting functions is possible, for function to be practically useful, it should satisfy several criteria: simple analytic form, minimum description shape as "zero case", estimation desired parameters a straightforward way and,...
Abstract We have constructed a hyper‐Raman optimized spectrometer using high repetition rate (200 kHz) picosecond‐pulsed Nd:YAG laser. This system has been applied to measure liquid water and ice (H 2 O D O) obtain their spectra with signal‐to‐noise ratios. Unique vibrational of ice, distinct either from infrared absorption Raman scattering, obtained. The intermolecular bands in the low‐wavenumber region are observed intensities higher than those intramolecular ones. They show H/D isotope...
Raman spectroscopy of nano-scale materials is facing a challenge developing physically sound quantitative approach for the phonon confinement effect, which profoundly affects band shapes small particles. We have developed new based on 3-dimensional dispersion functions. It analyzes quantitatively in terms particle size distributions. To test model, we successfully obtained good fits observed spectra diamond nanoparticles range from 1 to 100 nm.
Raman spectroscopy of crystalline/molecular systems is well grounded with quantum‐chemical calculations and group theory, making it a unique tool for material characterization. For the ‘intermediate’ case nanometer‐scale systems, however, application limited by lack such theoretical bases. Here, we couple scaled calculation phonon confinement model to construct universal physically consistent basis nanoscale spectroscopy. Unlike commonly assumed one‐dimensional approximation dispersion, take...
The alkaline activation of a carbonized graphene oxide/dextrin mixture yielded carbon-based nanoscale material (AC-TR) with unique highly porous structure. BET-estimated specific surface area the is 3167 m2/g, which higher than layer. has density 0.34 g/cm3 and electrical resistivity 0.25 Ω·cm its properties were studied using elemental analysis, transmission electron microscopy (TEM), diffraction (ED), X-ray (XRD), Raman spectroscopy, photoelectron spectroscopy (XPS), induced Auger (XAES),...
Aerogels based on polytetrafluoroethylene (60 and 50 mass %) graphene oxide were obtained. After hydrazine reduction annealing in an inert atmosphere, the aerogels became superhydrophobic with a contact wetting angle outer surface of 166–170°. The pore size distribution was measured by method standard porosimetry range 1÷105 nm octane water as working fluids. It found that wettability small pores higher than octane. Internal hydrophilicity due to "swelling" hydrated −CO −COH groups, presence...
Thermally stable films were obtained from a water-based polyurethane (PU) dispersion with small (0.1-1.5 wt.%) additions of graphene oxide (GO). The studied through elemental analysis, X-ray photoelectron spectroscopy, differential thermogravimetry, and Raman spectroscopy. It was found that the introduction GO into PU matrix accompanied by partial reduction in nanosheet an increase concentration defects structure. has been also established [C/N]at ratio near-surface layer PU/GO composite...
In the presented paper, we studied bilayer CVD graphene transferred to a langasite substrate and irradiated with focused electron beam through layer of polymethyl methacrylate (PMMA). Changes in Raman spectra an increase electrical resistance bigraphene after irradiation indicate local phase transition associated diamondization. The results are explained framework theory chemically induced diamane, which can be release hydrogen oxygen atoms from PMMA due "knock-on" effect, respectively, upon...
Polarized optical conductivity spectra in the IR and visible range variable-temperature photoluminescence of ${\text{C}}_{60}{\text{F}}_{18}$ single crystals 4--300 K temperature are reported. Density-functional theory (DFT) calculations vibrational time-dependent DFT excitation energies molecule performed to interpret experimentally observed phenomena. Orientation ${C}_{3v}$-symmetric molecules crystal is revealed by comparison experimental polarized calculations. ${A}_{2}$ symmetry...
Baseline estimation in vibrational spectroscopy can be done efficiently with Tikhonov regularization. The state-of-the-art approaches, based on asymmetric weighting, require an additional parameter. Besides λ, the penalty for second derivative, they introduce asymmetry parameter p that sets different weights points above and below baseline. To choose parameters "once all" is not possible, because always depend noise level baseline flexibility. Currently, common practice to these two...
Abstract Several approaches may be used to link the Raman spectra characteristic size scale of nanomaterials. To treat vibrations nanocrystal as localized phonons is a basic idea phonon confinement model (PCM). This review describes different approximations proposed since pioneering work Richter et al. in 1981. Early implementations PCM received criticism for arbitrariness introduced parameters and physically unsound assumptions. Later, physical consistent version was which coupled with...
A graphene oxide aerogel (GOA) was formed inside a melamine sponge (MS) framework. After reduction with hydrazine at 60 °C, the electrical conductive nitrogen-enriched rGOA-MS composite material specific density of 20.1 mg/cm3 used to fabricate an electrode, which proved be promising electrocatalyst for oxygen reaction. The characterized by elemental analysis, scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. It found that nitrogen in is presented...