sergey fanchenko - Academia.edu (original) (raw)

Uploads

Papers by sergey fanchenko

IOP Conference Series: Materials Science and Engineering, 2016

A new generation of the infrared light-emitting diodes (LEDs) and photodiodes (PDs) was used to c... more A new generation of the infrared light-emitting diodes (LEDs) and photodiodes (PDs) was used to construct an open path non-dispersive infrared (NDIR) methane analyzer. It was shown earlier that its characteristics are suitable for usual alarm systems, but new measurements have shown that cross sensitivity to other alkanes is rather high.

The Journal of Physical Chemistry A, 2008

We present an innovative approach to characterize small metal nanoclusters embedded in an amorpho... more We present an innovative approach to characterize small metal nanoclusters embedded in an amorphous carbon matrix. A simple mathematical relation linking binding energy shifts to the mean nanoparticle (NP) dimensions allows determination of the distribution of NP sizes by fitting the Au 4f X-ray photoemission spectrum. The NP size distributions obtained using our method are compared with those obtained from X-ray diffraction spectra.

physica status solidi (b), 2002

Diamond and Related Materials, 2007

Thin film vacuum deposition technology has been considered with respect to the production of elec... more Thin film vacuum deposition technology has been considered with respect to the production of electrodes for electrochemical gas sensors. Electrodes, employing Pt and Au as catalytic agents, are produced by Magnetron Sputtering (MS) co-deposition of graphite/noble metal. Once inserted in the sensor as working electrodes, the resultant amorphous carbon (a-C)–noble metal nanocomposite layers are shown to meet such requirements as

Applied Surface Science, 2008

Acta Crystallographica Section A Foundations of Crystallography, 1986

The angular dependence of the X-ray pure-diffraction intensity I(O) has been measured in Ge and S... more The angular dependence of the X-ray pure-diffraction intensity I(O) has been measured in Ge and Si single crystals (surface covered with natural oxide films) by means of triple-crystal dittractometry. Measurements were extended to specimen-crystal angular deviations from the Bragg angle of up to 500 Bragg-peak halfwidths. The I(0) data at such large deviation angles are informative of both static and dynamic Debye-Waller-factor variation over crystal depth, the achievable spatial resolution turning out to be of the order of 1 nm. The high spatial resolution of the asymptotic Bragg diffraction made it necessary to consider in theory the layer-to-layer variation of both the scattering characteristics (Debye-Waller factor) and the interplanar spacings. A theoretical treatment of the problem is presented. Reconstructed Debye-Waller factors for the first four atomic planes, counting from the crystal-oxide boundary, are 0.3, 0.4, 0.7, 0.7 and 0"6, 0"6, 0.9, 1 for Ge and Si, respectively.

ABSTRACT We compare the sensitivity of electrochemical gas sensors employing either traditional w... more ABSTRACT We compare the sensitivity of electrochemical gas sensors employing either traditional working electrodes based on platinum black or new working electrodes based on a-C/Pt films deposited by magnetron sputtering (MS). The new electrodes are shown to be five times less sensitive as compared to the traditional ones. However, their Pt content is about 25 times less as compared to traditional electrodes, which suggests a more efficient use of Pt. Morphological, compositional and structural investigations are performed to understand the electrochemical behaviour of the two electrodes. Copyright © 2006 John Wiley & Sons, Ltd.

Acta Crystallographica Section A Foundations of Crystallography, 1993

The Si/SiO2 interface of a single crystal has been investigated by the double-crystal inclination... more The Si/SiO2 interface of a single crystal has been investigated by the double-crystal inclination method, the surface peak being measured. The distorted layer depth is shown to be of the order of 1 nm and the amorphous film depth of the order of 6 nm.

2016 IEEE International Smart Cities Conference (ISC2), 2016

2016 IEEE Workshop on Environmental, Energy, and Structural Monitoring Systems (EESMS), 2016

IOP Conference Series: Materials Science and Engineering, 2016

Doklady Akademii nauk SSSR

A phenomenological expression for the relaxation operator is proposed which yields a relatively s... more A phenomenological expression for the relaxation operator is proposed which yields a relatively simple description of a quantum parametric oscillator with friction. The relaxation processes are described using the density matrix formalism. The phenomenological theory of phase relaxation presented here can be useful in the study of nonlinear interactions between optical and acoustical phonons in the presence of a strong coherent optical field or in problems related to the detection of gravitational waves.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1998

ABSTRACT The main features of the X-ray complex diffractometer for the Kurchatov Synchrotron Radi... more ABSTRACT The main features of the X-ray complex diffractometer for the Kurchatov Synchrotron Radiation Source are considered. Typical X-ray experiments for this diffractometer are discussed.

Applied Surface Science, 2014

ABSTRACT We investigate a system consisting of Au nano-clusters and amorphous carbon (a-C) via co... more ABSTRACT We investigate a system consisting of Au nano-clusters and amorphous carbon (a-C) via core-level photoemission. While the ability of photoemission to characterize nano-sized metal clusters is well-known, still some issues deserve investigation. For example, the well-established dominance of final-state relaxation effects in core-level spectra from nano-clusters necessarily involves a crucial role of the cluster dielectric-environment. To the best of our knowledge however, a thorough discussion on this point is lacking. We thus intend to investigate dielectric-environment effects by considering several configurations for Au clusters, i.e. supported and embedded, with the latter obtained either by depositing a-C on top of supported clusters or by co-depositing a-C and Au. We analyze the Au4 f spectrum from clusters accounting for both cluster size and cluster location with respect to the a-C matrix. We show that spectral changes caused by a-C deposition are entirely explained in terms of changes in the cluster dielectric environment. Moreover, we prove that supported clusters are in a well-characterized dielectric environment, while embedded clusters are not. This is because embedded clusters, whatever the method of production, are spatially distributed over the matrix surface-region which is characterized by rapid fluctuations in the dielectric constant.

Nanotechnologies in Russia, 2009

2015 IEEE Workshop on Environmental, Energy, and Structural Monitoring Systems (EESMS) Proceedings, 2015

IOP Conference Series: Materials Science and Engineering, 2016

A new generation of the infrared light-emitting diodes (LEDs) and photodiodes (PDs) was used to c... more A new generation of the infrared light-emitting diodes (LEDs) and photodiodes (PDs) was used to construct an open path non-dispersive infrared (NDIR) methane analyzer. It was shown earlier that its characteristics are suitable for usual alarm systems, but new measurements have shown that cross sensitivity to other alkanes is rather high.

The Journal of Physical Chemistry A, 2008

We present an innovative approach to characterize small metal nanoclusters embedded in an amorpho... more We present an innovative approach to characterize small metal nanoclusters embedded in an amorphous carbon matrix. A simple mathematical relation linking binding energy shifts to the mean nanoparticle (NP) dimensions allows determination of the distribution of NP sizes by fitting the Au 4f X-ray photoemission spectrum. The NP size distributions obtained using our method are compared with those obtained from X-ray diffraction spectra.

physica status solidi (b), 2002

Diamond and Related Materials, 2007

Thin film vacuum deposition technology has been considered with respect to the production of elec... more Thin film vacuum deposition technology has been considered with respect to the production of electrodes for electrochemical gas sensors. Electrodes, employing Pt and Au as catalytic agents, are produced by Magnetron Sputtering (MS) co-deposition of graphite/noble metal. Once inserted in the sensor as working electrodes, the resultant amorphous carbon (a-C)–noble metal nanocomposite layers are shown to meet such requirements as

Applied Surface Science, 2008

Acta Crystallographica Section A Foundations of Crystallography, 1986

The angular dependence of the X-ray pure-diffraction intensity I(O) has been measured in Ge and S... more The angular dependence of the X-ray pure-diffraction intensity I(O) has been measured in Ge and Si single crystals (surface covered with natural oxide films) by means of triple-crystal dittractometry. Measurements were extended to specimen-crystal angular deviations from the Bragg angle of up to 500 Bragg-peak halfwidths. The I(0) data at such large deviation angles are informative of both static and dynamic Debye-Waller-factor variation over crystal depth, the achievable spatial resolution turning out to be of the order of 1 nm. The high spatial resolution of the asymptotic Bragg diffraction made it necessary to consider in theory the layer-to-layer variation of both the scattering characteristics (Debye-Waller factor) and the interplanar spacings. A theoretical treatment of the problem is presented. Reconstructed Debye-Waller factors for the first four atomic planes, counting from the crystal-oxide boundary, are 0.3, 0.4, 0.7, 0.7 and 0"6, 0"6, 0.9, 1 for Ge and Si, respectively.

ABSTRACT We compare the sensitivity of electrochemical gas sensors employing either traditional w... more ABSTRACT We compare the sensitivity of electrochemical gas sensors employing either traditional working electrodes based on platinum black or new working electrodes based on a-C/Pt films deposited by magnetron sputtering (MS). The new electrodes are shown to be five times less sensitive as compared to the traditional ones. However, their Pt content is about 25 times less as compared to traditional electrodes, which suggests a more efficient use of Pt. Morphological, compositional and structural investigations are performed to understand the electrochemical behaviour of the two electrodes. Copyright © 2006 John Wiley & Sons, Ltd.

Acta Crystallographica Section A Foundations of Crystallography, 1993

The Si/SiO2 interface of a single crystal has been investigated by the double-crystal inclination... more The Si/SiO2 interface of a single crystal has been investigated by the double-crystal inclination method, the surface peak being measured. The distorted layer depth is shown to be of the order of 1 nm and the amorphous film depth of the order of 6 nm.

2016 IEEE International Smart Cities Conference (ISC2), 2016

2016 IEEE Workshop on Environmental, Energy, and Structural Monitoring Systems (EESMS), 2016

IOP Conference Series: Materials Science and Engineering, 2016

Doklady Akademii nauk SSSR

A phenomenological expression for the relaxation operator is proposed which yields a relatively s... more A phenomenological expression for the relaxation operator is proposed which yields a relatively simple description of a quantum parametric oscillator with friction. The relaxation processes are described using the density matrix formalism. The phenomenological theory of phase relaxation presented here can be useful in the study of nonlinear interactions between optical and acoustical phonons in the presence of a strong coherent optical field or in problems related to the detection of gravitational waves.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1998

ABSTRACT The main features of the X-ray complex diffractometer for the Kurchatov Synchrotron Radi... more ABSTRACT The main features of the X-ray complex diffractometer for the Kurchatov Synchrotron Radiation Source are considered. Typical X-ray experiments for this diffractometer are discussed.

Applied Surface Science, 2014

ABSTRACT We investigate a system consisting of Au nano-clusters and amorphous carbon (a-C) via co... more ABSTRACT We investigate a system consisting of Au nano-clusters and amorphous carbon (a-C) via core-level photoemission. While the ability of photoemission to characterize nano-sized metal clusters is well-known, still some issues deserve investigation. For example, the well-established dominance of final-state relaxation effects in core-level spectra from nano-clusters necessarily involves a crucial role of the cluster dielectric-environment. To the best of our knowledge however, a thorough discussion on this point is lacking. We thus intend to investigate dielectric-environment effects by considering several configurations for Au clusters, i.e. supported and embedded, with the latter obtained either by depositing a-C on top of supported clusters or by co-depositing a-C and Au. We analyze the Au4 f spectrum from clusters accounting for both cluster size and cluster location with respect to the a-C matrix. We show that spectral changes caused by a-C deposition are entirely explained in terms of changes in the cluster dielectric environment. Moreover, we prove that supported clusters are in a well-characterized dielectric environment, while embedded clusters are not. This is because embedded clusters, whatever the method of production, are spatially distributed over the matrix surface-region which is characterized by rapid fluctuations in the dielectric constant.

Nanotechnologies in Russia, 2009

2015 IEEE Workshop on Environmental, Energy, and Structural Monitoring Systems (EESMS) Proceedings, 2015