S. V. Savilov

S. V. Savilov
Lomonosov Moscow State University | MSU · Faculty of Chemistry

PhD, Associated Professor

About

158
Publications
10,778
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1,385
Citations
Citations since 2016
82 Research Items
1104 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (158)
Article
Heterosubstitution in graphene materials is a powerful tool for targeted variation of their structural and electronic characteristics. In this work, the template pyrolytic approach combined with the simultaneous doping with nitrogen and silicon atoms was used for the first time to synthesize graphene nanoflakes. It was found that materials co-doped...
Article
La0.7Ca0.3-xSrxMn0.95Al0.05O3 manganites doped in A- and B- positions of perovskite ABO3 cell are studied. Replacing of Mn3+ with Al3+ lowers the density of itinerant eg electrons. It weakens the double exchange and decreases Curie temperature (TC). Continuous substitution of Ca2+ ion with larger Sr2+ ion leads to increase of average and local crys...
Article
Full-text available
An approach for polymer-carbon nanotube (CNT) composite preparation is proposed based on a two-step supercritical fluid treatment. The first step, rapid expansion of a suspension (RESS) of CNTs in supercritical carbon dioxide, is used to de-bundle CNTs in order to simplify their mixing with polymer in solution. The ability of RESS pre-treatment to...
Article
CO2-assisted oxidative dehydrogenation of propane (ODP) is a promising approach for addressing two great modern challenges: effective CO2 utilization and propylene synthesis. In this work different carbon materials were for the first time used as supports for Cr-based catalysts of CO2-assisted ODP. Carbon nanotubes (CNTs), jellyfish-like graphene n...
Article
The tribological and rheological characteristics of three industrially produced greases and a model lubricant (medical vaseline) doped with new carbon nanoflakes additives (few layer graphite nanofragments, LGF and their nitrogen-containing analog, N-LGF) have been studied. It is shown that the modification of carbon structure with heteroatoms can...
Article
Covalently crosslinked 3D structures of carbon nanotubes (CNTs) and CNTs with low-layer graphene fragments (LGFs) are obtained via the hydrolysis of 3-aminopropyltriethoxysilane with oxidized CNTs and/or LGFs. The resulting samples are consolidated into non-disintegrating pellets through spark plasma sintering at 1100°C and 30 MPa. Oxygen-containin...
Article
The local electronic and crystal structures of self-doped Pr1-xMnO3+δ (x=0.0 and 0.2) perovskites are studied by x-ray absorption spectroscopy at Mn K-, Mn L- and O K-edges. The Mn K-edge shifts towards higher energy with increasing x indicating the increase in average manganese valence, which, in turn, leads to an increase in magnetization. The Mn...
Article
Full-text available
Nitrogen-doped graphene nanoflakes with a high nitrogen content (6.6 at %) and developed mesoporosity were synthesized via pyridine pyrolysis. They were tested in a supercapacitor with a non-aqueous electrolyte: a 1.2 M solution of ionic liquid Et 4 N ⁺ TFSI ⁻ in acetonitrile. It was found that incorporation of nitrogen into the graphene layers nea...
Article
This paper describes a study of the nature and the mechanism of ion transfer in Ca6.25Pb4.25(VO4)7 with β-Ca3(PO4)2-type structure by the Tubandt method. The comparison of weight change to the quantity of electricity passed through the stack allowed us to state that migration of both Ca²⁺ and Pb²⁺ cations was present. The transference numbers were...
Article
The mixtures of template carbon foams and carbon spheres were synthesized by pyrolysis of hexane over Ni foam, followed by graphitization. All samples were analyzed by scanning and transmission electron microscopy, the BET method, thermogravimetry, Raman spectroscopy and X-ray diffraction. The standard enthalpy of formation of the presented materia...
Article
The structure of hydrated ions of monochloroacetic acid was determined by electrospray of aqueous solution of monochloroacetic acid into the vacuum chamber of the mass spectrograph. It was found that the distribution of ions in degree of hydration depends on the concentration of acid in the initial solution. The number of the hydrated ions monotoni...
Article
Layered nickel-rich transition metal oxides with high energy density are one of the most promising cathode materials for lithium-ion batteries. However, they generally suffer from rapid capacity decay predominantly resulting from the side reactions at the interface between electrode and electrolyte. The conventional surface modification methods ado...
Article
Nitrogen-doped carbon nanomaterials show unique properties in catalysis both as an active component and as a support. The oxidized and N-doped graphene nanoflakes (GNFs) of low domain size (10–30 nm) have been studied in present work as supports for cobalt-based Fischer-Tropsch catalysts. Three supports with different types of dominating nitrogen s...
Article
Cerium-containing cobalt-aluminum layered double hydroxide was successfully synthesized via coprecipitation followed by hydrothermal treatment. Molar ratios of metal cations were predetermined as following: Co²⁺/(Al³⁺ + Ce³⁺) = 3 and Ce³⁺/(Al³⁺ + Ce³⁺) = 0.05. According to X-ray diffraction data, the obtained sample was well crystallized single-pha...
Article
Development of alternative ways to produce clean fuels is a significant and strategically important challenge. One of the most effective approaches is the Fischer-Tropsch synthesis (FTS), which is realized over Co- or Fe-based catalysts. In this work spark plasma sintering was applied for the synthesis of bulk core-shell Co and Fe CNT-supported FTS...
Article
Solvothermal reduction of graphene oxide performed up to a sp2/sp3 ratio of 20 was demonstrated. The presence of chemical and structural defects was minimized by varying the treatment conditions and reduction agents to reduce their impact on electronic and optical properties. Using the interphase deposition technique both graphene oxide and reduced...
Article
Cylindrical and conical carbon nanotubes were used as catalysts for the conversion of C3–C4 secondary aliphatic alcohols. The effect of the oxidative and reductive treatment of carbon nanotubes on the catalytic activity, selectivity and the conversion of propan-2-ol and butan-2-ol related to the structure of carbon matrix was revealed.
Article
Electronic structure of niobium doped CaMn1-xNbxO3 (x = 0.02, 0.04, 0.06 and 0.08) powder and fresh chip manganites was studied by x-ray absorption near edge spectroscopy (XANES) at Mn K-edge, and by x-ray photoelectron spectroscopy (XPS) of Mn 3s -, Mn 2p -, O 1s -, Ca 2p- and Nb 3d-core levels. These XPS spectra for all the studied perovskites ar...
Article
Electronic structure of copper complexes with redox-active ligands as studied by XPS. The temperature dependence of the redistribution of electron and spin densities was shown. A low temperature anomaly of magnetic properties of the copper complex with redox-active ligands was detected. The observed two states of copper (Cu+1 and Cu+2) allowed prop...
Article
Full-text available
Viscosity and viscosity-temperature dependence are the main criteria for selection of greases. The assessment of viscoelastic flow of three industrially produced greases doped with four types of carbon nanoparticles (CNP) was performed. The effect of concentra- tion, the type of CNP, as well as the shift frequency (shear and oscillation tests) on...
Article
Full-text available
The paper presents experimental data on the rheological properties of “Vaseline – Carbon Nanoparticles” systems, which were obtained through oscillation tests. The nanoparticles used are multi-layered oxidized graphene (Gr), single- (SWCNTs) and multi-walled (MWCNTs) carbon nanotubes, as well as shungite nanocarbon (Sh). It was demonstrated that wh...
Article
Full-text available
Viscosity and the viscosity-temperature dependence are the main criteria for selecting plastic lubricant materials (PLM). The viscoelastic flow of three industrially produced PLM doped with four types of carbon nanostructure (CNS) was assessed. The effect of concentration, type of CNS, and frequency shift (shear and oscillation tests) on this indic...
Article
New composites based on nitrogen-doped carbon nanoparticles (N-CNT), the surfaces of which are coated with metallic cobalt nanoparticles, are obtained via spark plasma sintering (SPS). Their morphology, microstructure, phase composition, and electric conductivity are examined thoroughly. The compacting of Co-modified nanotubes under specified SPS c...
Article
The work is devoted to the development of hybrid materials for medical hyperthermy based on carbon nanotubes (CNTs) modified in their internal channels by perovskite-like manganites. It is shown that phases are formed in preliminarily opened channels of tubes from precursors: salts, manganese, strontium, calcium and lanthanum carbonates and oxides....
Article
Values of specific electric conductivity are determined for nitrogen-doped carbon nanotubes (N‑CNTs) and N-CNTs oxidized with 68 wt % HNO3. It is established that the electrical conductivity of the material falls considerably along with nitrogen content in the tubular structure of the N-CNTs and an increase in the number of oxygen-containing groups...
Article
Full-text available
Reduction of CO2 with hydrogen into CH4 is studied for the first time on carbon‐nanotube‐supported Co and Ni catalysts under supercritical conditions. The extremely high selectivity toward methanation close to 100% is found with a quite good stability of the catalytic activity. The most practical way of CO2 utilization is its hydrogenation into val...
Article
Pseudomorphs (mesocages) of metallic silver were prepared via either a shape-preserving reduction of polyhedral Ag2O precursors with H2O2 in aqueous ammonia or an ultrasonic spray pyrolysis of aqueous diamminesilver(i) hydroxide. Both the materials were revealed as suitable for the direct analysis at 0.1–1 μm concentrations of oil pollutants and ph...
Article
Full-text available
The electronic structure of mono- and binuclear platinum complexes with N-phenyl-o benzosemiquinondiimine ligands was studied using X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and the density functional theory. The oxidation state of the central platinum ion corresponds to that of Pt(II). Upon the transition from the trans-comp...
Article
Self-doped La1-xMnO3+δ manganites (x = 0.0 and 0.15) were studied by Raman and x-ray photoelectron spectroscopy (XPS). The magnitude of Mn 3s splitting was measured by XPS and found to be constant for the both oxides indicating equal average manganese valences. The observed change in the Curie temperature between the samples, combined with the inva...
Article
Full-text available
Dicationic ionic liquid (IL) dibutyltetramethylethylenediammonium tetrafluoridoborate was synthesized for the first time by quaternization followed by ion exchange. The chemical composition was confirmed by ¹H, ¹⁹F, and ¹³C nuclear magnetic resonance (NMR) spectroscopy. The crystal structure of the IL under discussion was determined from single cry...
Article
X-ray absorption spectroscopy at Mn K- and L-edges, and at O K-edge, combined with the x-ray diffraction and magnetization measurements are performed to study the electron structure of La 0.7 Ca 0.3 Mn 1-x Sc x O 3 (x = 0.0; 0.03, and 0.05) perovskites. Substitution of manganese by scandium decreases Curie temperature, Tc, and increases lattice par...
Article
The effective activation energies of CO methanation and water gas shift reactions in the Fischer–Tropsch process in the presence of cobalt catalysts supported on oxidized and unoxidized carbon nanotubes have been determined. It has been found that the energy of CO methanation does not depend on the oxidation degree of the support and varies in a na...
Article
Using the methods of scanning and transmission electron microscopy (SEM and TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy, the influence of concentration, time, and the procedure for the oxidative treatment of the surface of carbon nanotubes (CNTs) and nitrogen-doped carbon nanotubes (N-CNTs) in the mixture with calcium nitrat...
Article
The hot-press technique is applied to lower the sintering temperature and shorten the sintering process of Li1.5Al0.5Ge1.5(PO4)3 (LAGP). The hot-press conditions are studied to obtain well sintered LAGP pellet with high Li ion conductivity. The highest Li ion conductivity is obtained at 550 oC for 30 min at 7 MPa and the values are 3.8, 3.4 and 1.8...
Article
The sharp increase in the cost of lithium resource has driven the research on sodium-ion batteries (SIBs) as sodium shares a similar electrochemical property as lithium. Carbonaceous materials are important anodes for rechargeable batteries, but the prevailing graphite only shows a limited activity towards sodium storage. Herein, we demonstrate tha...
Article
The development and deployment of sodium–ion batteries call on efficient electrode materials. Materials based on antimony and bismuth are capable of storing a high‐concentration of Na⁺ ions by a reversible alloying reaction at suitable redox potentials, and thus have drawn substantial attention. However, these electrode materials are facing signifi...
Article
La0.7Ca0.3Mn0.95M0.05O3 (M = Mn, Al, 0.5Al+0.5In, and In) perovskites (ABO3) were studied with x-ray diffraction and AC susceptibility measurements. We provide the phenomenological expressions for the electron bandwidth, W, and Curie temperature, TC, to describe the variance in these values caused by the change of the degree of doping in the A- pos...
Article
Nanotechnologies offer tremendous potential when it comes to modifying the microstructure of steel through the incorporation of nanoparticles. While typical production methods for metal-matrix composites are difficult and expensive, conventional casting routes suffer from inhomogeneity and agglomeration of the added nanoparticles. The aim of this s...
Article
Full-text available
Gold porous films with an 2D inverse opal structure were prepared via electrochemical deposition for further application as SERS-active substrates for the on-chip analysis of heme B derivatives. The thickness of the deposited film was controlled through deposition charge while the grain size was dependent significantly on electrolyte content. A sem...
Article
Sodium‐ion batteries (SIBs) that efficiently store electricity into chemical energy have been extensively pursued because of their great potential for low‐cost and large‐scale stationary application such as smart grid and renewable energy. Successful deployment of SIBs requires efficient anode materials that could store Na+ ions via a reversible wa...
Article
Electron structure of self-doped La1−xMnO3+δ perovskites is studied with X-ray absorption spectroscopy by measuring the spectra at manganese L-edges and oxygen K-edge, and analyzing the results for Mn K-edge spectra and magnetization data. The observed change of Curie temperature is explained by the change of level of hybridization of Mn 3d states...
Article
Carbon nanotubes (CNTs) with different content of carboxylated groups on their surface (depending on the duration of their treatment with nitric acid) were synthesized. All samples were analyzed by thermal analyses, X-ray photoelectron spectroscopy, Raman and energy-dispersive X-ray spectroscopy, transmission electron microscopy and SBET. The adiab...
Article
The adsorption of CH2Cl2, CH3Cl, CCl4, and H2O vapors on the surface of multi-walled carbon nanotubes and alumina in the temperature range of 10—25 °C was studied. Dependences of the isosteric heat of adsorption on the surface coverage were plotted. The initial heat of adsorption of dichloromethane, chloroform, and CCl4 on Al2O3 was found to be equ...
Article
A complex analysis of the vacancy-doped Pr1-xMnO3+δ (x = 0.0, 0.2) manganites is performed by x-ray diffraction, Raman and x-ray photoelectron spectroscopy, and magnetic measurements to study the features of electron, phonon and magnetic structure of the compounds. The x = 0.0 oxide belongs to orthorhombic Pnma structure, while the x = 0.2 exhibits...
Article
The development of solid electrolytes with superior electrical and electrochemical performances for the room-temperature operation of sodium (Na)-based batteries is at the infant stage and still remains a challenge. Herein, we, for the first time, report hybrid solid electrolytes consisting of PEO20-NaClO4-5% SiO2-x% Emim FSI (x = 50, 70) designed...
Article
Full-text available
Porous films formed by cylindrical geometrically anisotropic fragments of TiO2 have been produced by electrochemical anodization of titanium. The specific surface area and pore volume of the samples were determined by the BET method. It is shown that the samples have a bimodal pore-size distribution with maxima depending on the anodization voltage:...
Article
Carbon nanomaterials with the structure of graphene and different compositions of the surface groups are used as catalysts for the conversion of С2–С4 aliphatic alcohols. The conversions of ethanol, propanol- 1, propanol-2, butanol-1, butanol-2, and tert-butanol on carbon nanotubes, nanoflakes, and nanoflakes doped with nitrogen are investigated. O...
Article
In this work we present a simple and scalable approach to fabricate highly-active, self-supported molybdenum dioxide (MoO2) film for lithium storage. The fabrication is based on a thermal oxidation of Mo foil under air atmosphere and a subsequent sulfurization treatment. A hybrid film composed of partially sulfurized MoO2 can be produced by control...
Article
Double and triple cobalt-containing phosphates Cs1–2xCoxZr2(PO4)3 (x = 0.15, 0.25, 0.50) with NASICON structure obtained by the sol–gel method were characterized using XRD, BET, XPS, and UV spectroscopy. The major isobutyl alcohol conversion reaction on these phosphates is dehydration. The triple phosphates have higher catalytic activity than the d...
Article
Carbon nanomaterials (CNMs), such as carbon nanotubes (CNTs), carbon nanoflakes (CNFs) and their N-doped derivatives, show sufficient correlations between structure, composition and properties. In this study, the relationships between structure and composition of different types of CNMs as well as their enthalpies of formation are analyzed based on...
Article
For the design of hydrophobized conductive gas diffusion layers of the electrodes of polymercontaining fuel cells, of great interest is the method for the formation of a fluoropolymer film from fluoropolymer solution in supercritical carbon dioxide. The present work describes the systematic studies on the carbon-fabric-deposited Teflon AF 2400 coat...
Article
Al ion conductive solid polymer electrolyte is prepared using poly(vinylidene fluoride) (PVdF) and AlCl3 as a host polymer and Al ion