Olga Kvashenkina

Olga Kvashenkina
Peter the Great St.Petersburg Polytechnic University | SPBSTU · Department of Radio Engineering and Telecommunications

PhD

About

22
Publications
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121
Citations

Publications

Publications (22)
Article
Full-text available
Herein, we describe a study of the phenomenon of field-induced electron emission from thin films deposited on flat Si substrates. Films of Mo with an effective thickness of 6–10 nm showed room-temperature low-field emissivity; a 100 nA current was extracted at macroscopic field magnitudes as low as 1.4–3.7 V/μm. This result was achieved after forma...
Article
Full-text available
In this work, an experimental comparison of the laser-driven alteration of nickel, copper, and steel surface efficiency was carried out. The selection of the material most suitable for non-enzymatic measurement of the glucose amount in the medium was carried with respect to surface modification efficiency. The electrooxidative activity of the fabri...
Article
Full-text available
We present the results of the recent experiments with two species of Ni/Al reactive multilayer nanofoils (RNMFs) supporting the self-propagating high-temperature synthesis (SHS) reaction. SEM method was used to evaluate their general structure and quantitative chemical composition before and after reaction. Phase composition was determined from XRD...
Article
The paper presents a new study of correlation between morphology of thin carbon films deposited on Si substrates, their electronic properties and capability of cold electron emission in electric field with macroscopic magnitude of the order of 1 V/μm. Comparative experiments have demonstrated that substrate parameters have little, if any, direct ef...
Article
Full-text available
Iron oxide nanoparticles of various sizes have been experimentally obtained in a capacitively coupled plasma of a radio frequency (RF) discharge at atmospheric pressure in constant and pulse-modulated modes of the RF discharge. Elemental analysis of the obtained nanoparticles by X-ray photoelectron spectroscopy (XPS) and IR Fourier spectroscopy sho...
Article
Full-text available
A novel integrated approach of solving the problem of the high-quality electrically conductive fastening of lead-zirconate-titanate piezoelectric elements is proposed. The essence of the method is that the specially created reactive multilayer material is used both as an electrode and as a solder. The mentioned reactive material is deposited direct...
Article
Full-text available
Raman spectroscopy was used to study the features of the electron-phonon interaction in thin carbon films that are capable of low-field emission of electrons. It was found that in the Raman spectra of samples with this ability the characteristic peaks of carbon were almost completely suppressed, and also a wide photoluminescence band could be prese...
Article
Previous experiments have demonstrated that carbon nanoisland films (or disordered quantum-dot arrays) deposited on silicon wafers may possess the property of low-field electron emission. This paper presents our new work on comparative characterization of emitting and nonemitting thin carbon films. The experimental results acquired by Auger spectro...
Article
Full-text available
The electronic structure of island carbon films on silicon, which are capable of low-voltage field electron emission (at the mean electric-field strength above several hundreds of V/mm), have been investigated. It has been shown by tunnel spectroscopy that islands of these coatings are characterized by a continuous spectrum of the allowed delocaliz...
Chapter
A complex concept concerning the multistage process of thermal semiconductor-metal phase transition in vanadium dioxide is discussed. According to the concept, the phase transformation proceeds in three stages: two stages occurring in a system of strongly correlated electrons and one stage in lattice system which increases the crystal lattice symme...
Chapter
A complex concept concerning the multistage process of thermal semiconductor-metal phase transition in vanadium dioxide is discussed. According to the concept, the phase transformation proceeds in three stages: two stages occurring in a system of strongly correlated electrons and one stage in lattice system which increases of the crystal lattice sy...
Article
Full-text available
Using optical spectroscopy, Raman scattering, and optical diffractometry, modification of the parameters of the insulator-metal transition in VO2 films upon bombardment with a mean-energy (6-10 keV) electron beam is investigated. It is shown that growth of the irradiation dose leads to a decrease in the temperature of the phase transition, an incre...
Article
It has been shown that, in single crystals and films of a strongly correlated material, namely, vanadium dioxide, upon a thermally stimulated phase transition from the low-temperature monoclinic phase to the high-temperature tetragonal phase, the narrow-line Raman spectrum of the insulating (monoclinic) phase transforms into the broad-band Raman sp...
Article
By the construction of a full grid of minor hysteresis loops and the step heating and cooling of vanadium dioxide films, it was found that the thermal semiconductor-metal phase transition in vanadium dioxide is a multistage process. It is shown that the transition consists of two inherently different transitions, i.e., electronic and structural one...
Article
A complex concept concerning the multistage process of thermal semiconductor-metal phase transition in vanadium dioxide is proposed. According to the concept, the transition proceeds in three stages: two stages occurring in a system of strongly correlated electrons and one stage which reduces to transformation of the crystal lattice symmetry. These...
Article
Full-text available
It is shown that a stable metallic phase of monoclinic symmetry arises in a hydrogenated vanadium dioxide film at room temperature. This means that hydrogenation of a VO{sub 2} film initiates the electronic phase transition to the metallic phase, which is not accompanied with a structural transition to the tetragonal phase.

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