Andrei Eliseev | Moscow State University (original) (raw)

Papers by Andrei Eliseev

The creation of functional nanomaterials with the controlled properties is emerging as a new area... more The creation of functional nanomaterials with the controlled properties is emerging as a new area of great technological and scientific interest, in particular, it is a key technology for developing novel high-density data storage devices. Today, no other technology can compete with magnetic carriers in information storage density and access rate. However, usually very small (10–1000 nm3) magnetic nanoparticles shows

The full exploration of the potential, which graphene offers to nanoelectronics requires its inte... more The full exploration of the potential, which graphene offers to nanoelectronics requires its integration into semiconductor technology. So far the real-world applications are limited by the ability to concomitantly achieve large single-crystalline domains on dielectrics and semiconductors and to tailor the interfaces between them. Here we show a new direct bottom-up method for the fabrication of high-quality atomically precise interfaces between 2D materials, like graphene and hexagonal boron nitride (hBN), and classical semiconductor via Ge intercalation. Using angleresolved photoemission spectroscopy and complementary DFT modelling we observed for the first time that epitaxially grown graphene with the Ge monolayer underneath demonstrates Dirac Fermions unaffected by the substrate as well as an unperturbed electronic band structure of hBN. This approach provides the intrinsic relativistic 2D electron gas towards integration in semiconductor technology. Hence, these new interfaces are a promising path for the integration of graphene and hBN into state-of-the-art semiconductor technology. In the recent years graphene attracted attention from researchers all over the world and was studied intensively because of its unique electronic properties showing promise for usage in next-generation electronics 1. However, for commercial applications, implementation on a large scale into classical semiconductor technology is still missing 2. Among other methods to grow graphene, chemical vapour deposition (CVD) on metallic substrates is known to achieve the highest quality of graphene sheets on a large scale 3,4. Unfortunately, the electronic properties of epitaxially grown graphene are complicated by charge puddles, charge transfer, corrugation, and hybridization, modifying its unique relativistic two-dimensional (2D) electron gas 5-8 , while the post-growth transfer procedure inevitably leads to corrugation, contamination and breakage of graphene sheets 9. Thus, many efforts were put to reduce the

ChemInform, Jun 16, 2010

Cryosol Synthesis of Al 2−x CrxO 3 Solid Solutions.-A novel synthesis of solid solutions of Al 2−... more Cryosol Synthesis of Al 2−x CrxO 3 Solid Solutions.-A novel synthesis of solid solutions of Al 2−x CrxO 3 based on a newly developed cryosol process is given. Freeze-drying of hydroxide sols formed by treatment of aqueous solutions of the element nitrates with anion exchange resin (OH −-form) gives hydroxide precursors, which furnish the target solid solutions after annealing at relatively low temp. (950 • C) and times (2.5 h). The cryosol technique provides single-phase ruby powders containing ca. 7 mol.% Cr. Effects of the organization of the initial colloid system on the properties of the final solid solutions are studied.-(ELISEEV, A.

Biosensors and Bioelectronics

Nano Research, 2021

Structural ordering in the concentrated magnetic colloids containing 50 × 5 nm hard magnetic disc... more Structural ordering in the concentrated magnetic colloids containing 50 × 5 nm hard magnetic disc-like SrFe12O19 nanoparticles was investigated by cryogenic scanning electron microscopy, optical microscopy, magnetic measurements, and small-angle X-ray scattering. It was revealed that macroscopically homogeneous magnetic liquid consists of dynamic threads of stacked nanoparticles. The threads align into quasiperiodic arrays with the distances between individual threads of a few micrometers. They also can form pseudodomain structures with ~ 90° domain boundaries realized through T-type thread interconnects. The effects of magnetic attraction and electrostatic repulsion on the equilibrium interplatelet distance in the threads were studied. It was demonstrated that this distance can be tuned by the control of the particles charge and electric double layer screening from Stern layer thickness (~ 1 nm) to tens of nanometers. It was shown that the permanent magnetic field is not able to cause any structural changes in the ordered magnetic liquid phase, while alternating field draws particles apart by their vibrations. External variation of interparticle distance up to 6% was achieved using an alternating magnetic field of low intensity. Experimental data were complemented by the theoretical models of screened electrostatic interactions between spherical and platelike magnetic particles. The last model provides good predictive power and correlates with the experimental data. The stabilization energy of the condensed phase in the order of 1–10 kBT was derived from the model. An approach allows controlling of an equilibrium interparticle distance and interparticle distance distribution by adjusting the magnetization and surface charge of the particles as well as the ionic strength of the solvent.

Oil Industry Journal, 2016

Talanta, 2020

Here we report membrane capacitive sensors based on anodic aluminum oxide (AAO) Au/AAO/Au structu... more Here we report membrane capacitive sensors based on anodic aluminum oxide (AAO) Au/AAO/Au structures fabricated by aluminum anodization, followed by gold electrodes sputtering on the countersides of porous ceramic membrane. Electrochemical impedance spectroscopy with AC amplitude 5-100 mV in the frequency range of 1-1000 Hz was utilized for sensor characterization in the presence of water and organic vapors in a full range of P/P 0. The sensors illustrate ultimate sensitivity to ambient environment with exponential-scale capacitance relation to vapors content resulting in typical 4-6 orders of magnitude response signal change for 15-85% P/P 0 range at a single AC frequency, and up to 7 orders of magnitude response range for 0-100% P/P 0 pressure range with using two different AC frequencies. In case of water vapors, the sensitivity increases from 0.5 nF/RH% at~20 RH% to over~1.0 μF/RH% at~80 RH%. The sensors are capable for highly accurate sensing of gas humidity as well as any dissociative vapors with pKa < 30. They are also sensible to polar components with high enough dipole moment or polarizability. The capacitance is affected by any adsorbed molecules, including those having zero dipole moment. The data for sensor response to CH 3 OH, C 2 H 5 OH, CH 2 ClCHF 2 , i-C 4 H 10 depending on partial pressures is provided. Due to high porosity (10-30%) and gaseous permeance (up to 200 m 3 (STP) m-2 bar-1 h-1) the sensors offer fast response rate and a possibility for flowthrough measurements, providing also a mass-flow response option, which was tested with SF 6 , CO 2 , N 2 and He. The basic principles of dielectric loss sensor and the equivalent scheme were proposed for sensor operation in different environment, allowing estimating sensor response.

The interest in alternative energy sources grows rapidly and demands improved materials. The cutt... more The interest in alternative energy sources grows rapidly and demands improved materials. The cutting-edge investigations focus attention on the development and optimization of solid electrolytes for advanced energy storage. Their chemical and structural stability defines both battery performance and lifetime, yet it is studied poorly even for well-known superionic conductors like NASICON-based compounds. In this work, we studied the Li 1.3 Al 0.3 Ti 1.7 (PO 4) 3 (LATP) stability towards water. Corresponding ceramics were synthesized in pellet form through the solid-state reaction and had been immersed in deionized water for different periods of time with subsequent electrochemical (Electrochemical Impedance Spectroscopy), structural (Powder X-Ray Diffraction Analysis, Raman spectroscopy, computational modeling), chemical (ceramics-Energy-Dispersive X-ray spectroscopy; mother-solutions-Inductively Coupled Plasma Mass Spectrometry), and morphological (Scanning & Transmission Electron Microscopy) analyzes. Water exposure triggers drastic conductivity losses (64 % for σt) with accompanying lithium elution (exceeds 13 atomic %) and unit cell shrinkage. All these changes reach a plateau after 2 hours of water exposure.

Ceramics International, 2020

The present study reports the fast synthesis of VO 2 (М 1) oriented films on the r-Al 2 O 3 (012)... more The present study reports the fast synthesis of VO 2 (М 1) oriented films on the r-Al 2 O 3 (012) substrates by the hydrothermal method using citric acid and vanadium (V) oxide as precursors with post deposition annealing in inert atmosphere. The effects of synthesis parameters (solution concentration and autoclave filling factor) on the films composition, morphology and electric properties are considered using XRD, Raman spectroscopy, AFM and SEM. The obtaining VO 2 (M 1)/r-Al 2 O 3 films show a metal-insulator transition with resistivity change of~3.5 orders of magnitude and excellent thermochromic properties in the long-wavelength IR region. This work demonstrates a promising technique to promote the commercial implementation of VO 2 as material for design of infrared (IR) switch devices.

The creation of functional nanomaterials with the controlled properties is emerging as a new area... more The creation of functional nanomaterials with the controlled properties is emerging as a new area of great technological and scientific interest, in particular, it is a key technology for developing novel high-density data storage devices. Today, no other technology can compete with magnetic carriers in information storage density and access rate. However, usually very small (10–1000 nm3) magnetic nanoparticles shows

The full exploration of the potential, which graphene offers to nanoelectronics requires its inte... more The full exploration of the potential, which graphene offers to nanoelectronics requires its integration into semiconductor technology. So far the real-world applications are limited by the ability to concomitantly achieve large single-crystalline domains on dielectrics and semiconductors and to tailor the interfaces between them. Here we show a new direct bottom-up method for the fabrication of high-quality atomically precise interfaces between 2D materials, like graphene and hexagonal boron nitride (hBN), and classical semiconductor via Ge intercalation. Using angleresolved photoemission spectroscopy and complementary DFT modelling we observed for the first time that epitaxially grown graphene with the Ge monolayer underneath demonstrates Dirac Fermions unaffected by the substrate as well as an unperturbed electronic band structure of hBN. This approach provides the intrinsic relativistic 2D electron gas towards integration in semiconductor technology. Hence, these new interfaces are a promising path for the integration of graphene and hBN into state-of-the-art semiconductor technology. In the recent years graphene attracted attention from researchers all over the world and was studied intensively because of its unique electronic properties showing promise for usage in next-generation electronics 1. However, for commercial applications, implementation on a large scale into classical semiconductor technology is still missing 2. Among other methods to grow graphene, chemical vapour deposition (CVD) on metallic substrates is known to achieve the highest quality of graphene sheets on a large scale 3,4. Unfortunately, the electronic properties of epitaxially grown graphene are complicated by charge puddles, charge transfer, corrugation, and hybridization, modifying its unique relativistic two-dimensional (2D) electron gas 5-8 , while the post-growth transfer procedure inevitably leads to corrugation, contamination and breakage of graphene sheets 9. Thus, many efforts were put to reduce the

ChemInform, Jun 16, 2010

Cryosol Synthesis of Al 2−x CrxO 3 Solid Solutions.-A novel synthesis of solid solutions of Al 2−... more Cryosol Synthesis of Al 2−x CrxO 3 Solid Solutions.-A novel synthesis of solid solutions of Al 2−x CrxO 3 based on a newly developed cryosol process is given. Freeze-drying of hydroxide sols formed by treatment of aqueous solutions of the element nitrates with anion exchange resin (OH −-form) gives hydroxide precursors, which furnish the target solid solutions after annealing at relatively low temp. (950 • C) and times (2.5 h). The cryosol technique provides single-phase ruby powders containing ca. 7 mol.% Cr. Effects of the organization of the initial colloid system on the properties of the final solid solutions are studied.-(ELISEEV, A.

Biosensors and Bioelectronics

Nano Research, 2021

Structural ordering in the concentrated magnetic colloids containing 50 × 5 nm hard magnetic disc... more Structural ordering in the concentrated magnetic colloids containing 50 × 5 nm hard magnetic disc-like SrFe12O19 nanoparticles was investigated by cryogenic scanning electron microscopy, optical microscopy, magnetic measurements, and small-angle X-ray scattering. It was revealed that macroscopically homogeneous magnetic liquid consists of dynamic threads of stacked nanoparticles. The threads align into quasiperiodic arrays with the distances between individual threads of a few micrometers. They also can form pseudodomain structures with ~ 90° domain boundaries realized through T-type thread interconnects. The effects of magnetic attraction and electrostatic repulsion on the equilibrium interplatelet distance in the threads were studied. It was demonstrated that this distance can be tuned by the control of the particles charge and electric double layer screening from Stern layer thickness (~ 1 nm) to tens of nanometers. It was shown that the permanent magnetic field is not able to cause any structural changes in the ordered magnetic liquid phase, while alternating field draws particles apart by their vibrations. External variation of interparticle distance up to 6% was achieved using an alternating magnetic field of low intensity. Experimental data were complemented by the theoretical models of screened electrostatic interactions between spherical and platelike magnetic particles. The last model provides good predictive power and correlates with the experimental data. The stabilization energy of the condensed phase in the order of 1–10 kBT was derived from the model. An approach allows controlling of an equilibrium interparticle distance and interparticle distance distribution by adjusting the magnetization and surface charge of the particles as well as the ionic strength of the solvent.

Oil Industry Journal, 2016

Talanta, 2020

Here we report membrane capacitive sensors based on anodic aluminum oxide (AAO) Au/AAO/Au structu... more Here we report membrane capacitive sensors based on anodic aluminum oxide (AAO) Au/AAO/Au structures fabricated by aluminum anodization, followed by gold electrodes sputtering on the countersides of porous ceramic membrane. Electrochemical impedance spectroscopy with AC amplitude 5-100 mV in the frequency range of 1-1000 Hz was utilized for sensor characterization in the presence of water and organic vapors in a full range of P/P 0. The sensors illustrate ultimate sensitivity to ambient environment with exponential-scale capacitance relation to vapors content resulting in typical 4-6 orders of magnitude response signal change for 15-85% P/P 0 range at a single AC frequency, and up to 7 orders of magnitude response range for 0-100% P/P 0 pressure range with using two different AC frequencies. In case of water vapors, the sensitivity increases from 0.5 nF/RH% at~20 RH% to over~1.0 μF/RH% at~80 RH%. The sensors are capable for highly accurate sensing of gas humidity as well as any dissociative vapors with pKa < 30. They are also sensible to polar components with high enough dipole moment or polarizability. The capacitance is affected by any adsorbed molecules, including those having zero dipole moment. The data for sensor response to CH 3 OH, C 2 H 5 OH, CH 2 ClCHF 2 , i-C 4 H 10 depending on partial pressures is provided. Due to high porosity (10-30%) and gaseous permeance (up to 200 m 3 (STP) m-2 bar-1 h-1) the sensors offer fast response rate and a possibility for flowthrough measurements, providing also a mass-flow response option, which was tested with SF 6 , CO 2 , N 2 and He. The basic principles of dielectric loss sensor and the equivalent scheme were proposed for sensor operation in different environment, allowing estimating sensor response.

The interest in alternative energy sources grows rapidly and demands improved materials. The cutt... more The interest in alternative energy sources grows rapidly and demands improved materials. The cutting-edge investigations focus attention on the development and optimization of solid electrolytes for advanced energy storage. Their chemical and structural stability defines both battery performance and lifetime, yet it is studied poorly even for well-known superionic conductors like NASICON-based compounds. In this work, we studied the Li 1.3 Al 0.3 Ti 1.7 (PO 4) 3 (LATP) stability towards water. Corresponding ceramics were synthesized in pellet form through the solid-state reaction and had been immersed in deionized water for different periods of time with subsequent electrochemical (Electrochemical Impedance Spectroscopy), structural (Powder X-Ray Diffraction Analysis, Raman spectroscopy, computational modeling), chemical (ceramics-Energy-Dispersive X-ray spectroscopy; mother-solutions-Inductively Coupled Plasma Mass Spectrometry), and morphological (Scanning & Transmission Electron Microscopy) analyzes. Water exposure triggers drastic conductivity losses (64 % for σt) with accompanying lithium elution (exceeds 13 atomic %) and unit cell shrinkage. All these changes reach a plateau after 2 hours of water exposure.

Ceramics International, 2020

The present study reports the fast synthesis of VO 2 (М 1) oriented films on the r-Al 2 O 3 (012)... more The present study reports the fast synthesis of VO 2 (М 1) oriented films on the r-Al 2 O 3 (012) substrates by the hydrothermal method using citric acid and vanadium (V) oxide as precursors with post deposition annealing in inert atmosphere. The effects of synthesis parameters (solution concentration and autoclave filling factor) on the films composition, morphology and electric properties are considered using XRD, Raman spectroscopy, AFM and SEM. The obtaining VO 2 (M 1)/r-Al 2 O 3 films show a metal-insulator transition with resistivity change of~3.5 orders of magnitude and excellent thermochromic properties in the long-wavelength IR region. This work demonstrates a promising technique to promote the commercial implementation of VO 2 as material for design of infrared (IR) switch devices.