Victor Sysoev | Saratov State Technical University (original) (raw)
Papers by Victor Sysoev
ACS Applied Materials & Interfaces
Sensors
We discuss the fabrication of gas-analytical multisensor arrays based on ZnO nanorods grown via a... more We discuss the fabrication of gas-analytical multisensor arrays based on ZnO nanorods grown via a hydrothermal route directly on a multielectrode chip. The protocol to deposit the nanorods over the chip includes the primary formation of ZnO nano-clusters over the surface and secondly the oxide hydrothermal growth in a solution that facilitates the appearance of ZnO nanorods in the high aspect ratio which comprise a network. We have tested the proof-of-concept prototype of the ZnO nanorod network-based chip heated up to 400 °C versus three alcohol vapors, ethanol, isopropanol and butanol, at approx. 0.2–5 ppm concentrations when mixed with dry air. The results indicate that the developed chip is highly sensitive to these analytes with a detection limit down to the sub-ppm range. Due to the pristine differences in ZnO nanorod network density the chip yields a vector signal which enables the discrimination of various alcohols at a reasonable degree via processing by linear discriminant...
Sensors
The authors wish to make the following corrections to this paper [...]
Nanomaterials
Experimental results related to the photoactivated dc conductance of anatase TiO2 nanotubular arr... more Experimental results related to the photoactivated dc conductance of anatase TiO2 nanotubular arrays (aTNTAs) under pulsed irradiation by a laser light inside and outside the fundamental absorption band are presented. It is found that the mobility and diffusion coefficients of charge carriers in the examined aTNTA are extremely low due to a strong charge-phonon coupling, abundance of shallow traps, and hopping conductivity between adjacent nanotubes. We consider that the confining electric field appeared within the array structure due to the difference in the local concentrations of excess electrons and holes at large values of the dc conductance suppresses the drift current. In this case, the dc conductance of such aTNTAs is mainly matured by the diffusion of mobile carriers. A recurrent kinetic model for evolution of the dc conductance of aTNTAs under laser irradiation has been proposed to interpret the experimental results.
Nanomaterials (Basel, Switzerland), Jan 19, 2017
The development of portable gas-sensing units implies a special care of their power efficiency, w... more The development of portable gas-sensing units implies a special care of their power efficiency, which is often approached by operation at room temperature. This issue primarily appeals to a choice of suitable materials whose functional properties are sensitive toward gas vapors at these conditions. While the gas sensitivity is nowadays advanced by employing the materials at nano-dimensional domain, the room temperature operation might be targeted via the application of layered solid-state electrolytes, like titanates. Here, we report gas-sensitive properties of potassium titanate whiskers, which are placed over a multielectrode chip by drop casting from suspension to yield a matrix mono-layer of varied density. The material synthesis conditions are straightforward both to get stable single-crystalline quasi-one-dimensional whiskers with a great extent of potassium replacement and to favor the increase of specific surface area of the structures. The whisker layer is found to be sensi...
Nature communications, Oct 10, 2017
Narrow atomically precise graphene nanoribbons hold great promise for electronic and optoelectron... more Narrow atomically precise graphene nanoribbons hold great promise for electronic and optoelectronic applications, but the previously demonstrated nanoribbon-based devices typically suffer from low currents and mobilities. In this study, we explored the idea of lateral extension of graphene nanoribbons for improving their electrical conductivity. We started with a conventional chevron graphene nanoribbon, and designed its laterally extended variant. We synthesized these new graphene nanoribbons in solution and found that the lateral extension results in decrease of their electronic bandgap and improvement in the electrical conductivity of nanoribbon-based thin films. These films were employed in gas sensors and an electronic nose system, which showed improved responsivities to low molecular weight alcohols compared to similar sensors based on benchmark graphitic materials, such as graphene and reduced graphene oxide, and a reliable analyte recognition. This study shows the methodolog...
Sensors and Actuators B Chemical, 2009
European Physical Journal B Condensed Matter and Complex Systems, Jun 22, 2011
Bulletin of the American Physical Society, Mar 6, 2014
Sensors and Actuators A: Physical, 2014
ABSTRACT We demonstrate the application of low density SnO2 nanowire mats in a complete UV-VIS se... more ABSTRACT We demonstrate the application of low density SnO2 nanowire mats in a complete UV-VIS sensor system. Ultra long nanowires were grown the first time on ’black silicon’ substrates by high temperature condensation, yielding high quantity and quality. Compared to other metal oxides like ZnO, fast response times of under 1 s and recovery times of 10 s at room temperature were observed. Wavelength and power dependent resistance changes are determined. High sensitivity is achieved for UV radiation below 400 nm which already gives a response S = 1 − Ron/Roff to be about 92 percent at 2.7 mW/cm2.
Metal Oxide Nanomaterials for Chemical Sensors, 2012
ABSTRACT During the last decade, quasi-1D metal oxide nanostructures were proven to be a promisin... more ABSTRACT During the last decade, quasi-1D metal oxide nanostructures were proven to be a promising material platform to design new gas sensing elements. This chapter surveys the recent developments of the analytical devices based on multisensor arrays made of metal oxide nanowires. We briefly discuss the advantages and challenges of electronic noses and the major milestones of their development. We show that evolution of the nanowire based electronic noses follows the same trends: from fabrication of the devices based on discrete nanowires to creation of integrated systems made of nanowire mats and finally realization of a monolithic sensor array made from a single nanowire. The parameters and performance of such analytical systems is reviewed and fabrication protocols are discussed.
Proceedings of IEEE Sensors, 2004., 2004
In this paper, we describe thin nanostructured SnO2:Cu films fabricated by RF magnetron sputterin... more In this paper, we describe thin nanostructured SnO2:Cu films fabricated by RF magnetron sputtering and characterized with a variety of surface analytical techniques. The average grain size of the 200-1000 nm thick films with columnar structure was determined to be 20-100 nm. A slight oxygen deficiency was observed at the film surface by XPS with [O]/[Sn] ratio equal to about 1.6. Based on these films, gas sensor microarrays of the KAMINA (Karlsruhe Micronose) type were built up. The gas sensitivity of the film sensor segments operated at 350°C was found suitable to respond to tested reducing gases (ammonia, acetone, alcohols) with response times of less than 10 sec.
ACS Applied Materials & Interfaces
Sensors
We discuss the fabrication of gas-analytical multisensor arrays based on ZnO nanorods grown via a... more We discuss the fabrication of gas-analytical multisensor arrays based on ZnO nanorods grown via a hydrothermal route directly on a multielectrode chip. The protocol to deposit the nanorods over the chip includes the primary formation of ZnO nano-clusters over the surface and secondly the oxide hydrothermal growth in a solution that facilitates the appearance of ZnO nanorods in the high aspect ratio which comprise a network. We have tested the proof-of-concept prototype of the ZnO nanorod network-based chip heated up to 400 °C versus three alcohol vapors, ethanol, isopropanol and butanol, at approx. 0.2–5 ppm concentrations when mixed with dry air. The results indicate that the developed chip is highly sensitive to these analytes with a detection limit down to the sub-ppm range. Due to the pristine differences in ZnO nanorod network density the chip yields a vector signal which enables the discrimination of various alcohols at a reasonable degree via processing by linear discriminant...
Sensors
The authors wish to make the following corrections to this paper [...]
Nanomaterials
Experimental results related to the photoactivated dc conductance of anatase TiO2 nanotubular arr... more Experimental results related to the photoactivated dc conductance of anatase TiO2 nanotubular arrays (aTNTAs) under pulsed irradiation by a laser light inside and outside the fundamental absorption band are presented. It is found that the mobility and diffusion coefficients of charge carriers in the examined aTNTA are extremely low due to a strong charge-phonon coupling, abundance of shallow traps, and hopping conductivity between adjacent nanotubes. We consider that the confining electric field appeared within the array structure due to the difference in the local concentrations of excess electrons and holes at large values of the dc conductance suppresses the drift current. In this case, the dc conductance of such aTNTAs is mainly matured by the diffusion of mobile carriers. A recurrent kinetic model for evolution of the dc conductance of aTNTAs under laser irradiation has been proposed to interpret the experimental results.
Nanomaterials (Basel, Switzerland), Jan 19, 2017
The development of portable gas-sensing units implies a special care of their power efficiency, w... more The development of portable gas-sensing units implies a special care of their power efficiency, which is often approached by operation at room temperature. This issue primarily appeals to a choice of suitable materials whose functional properties are sensitive toward gas vapors at these conditions. While the gas sensitivity is nowadays advanced by employing the materials at nano-dimensional domain, the room temperature operation might be targeted via the application of layered solid-state electrolytes, like titanates. Here, we report gas-sensitive properties of potassium titanate whiskers, which are placed over a multielectrode chip by drop casting from suspension to yield a matrix mono-layer of varied density. The material synthesis conditions are straightforward both to get stable single-crystalline quasi-one-dimensional whiskers with a great extent of potassium replacement and to favor the increase of specific surface area of the structures. The whisker layer is found to be sensi...
Nature communications, Oct 10, 2017
Narrow atomically precise graphene nanoribbons hold great promise for electronic and optoelectron... more Narrow atomically precise graphene nanoribbons hold great promise for electronic and optoelectronic applications, but the previously demonstrated nanoribbon-based devices typically suffer from low currents and mobilities. In this study, we explored the idea of lateral extension of graphene nanoribbons for improving their electrical conductivity. We started with a conventional chevron graphene nanoribbon, and designed its laterally extended variant. We synthesized these new graphene nanoribbons in solution and found that the lateral extension results in decrease of their electronic bandgap and improvement in the electrical conductivity of nanoribbon-based thin films. These films were employed in gas sensors and an electronic nose system, which showed improved responsivities to low molecular weight alcohols compared to similar sensors based on benchmark graphitic materials, such as graphene and reduced graphene oxide, and a reliable analyte recognition. This study shows the methodolog...
Sensors and Actuators B Chemical, 2009
European Physical Journal B Condensed Matter and Complex Systems, Jun 22, 2011
Bulletin of the American Physical Society, Mar 6, 2014
Sensors and Actuators A: Physical, 2014
ABSTRACT We demonstrate the application of low density SnO2 nanowire mats in a complete UV-VIS se... more ABSTRACT We demonstrate the application of low density SnO2 nanowire mats in a complete UV-VIS sensor system. Ultra long nanowires were grown the first time on ’black silicon’ substrates by high temperature condensation, yielding high quantity and quality. Compared to other metal oxides like ZnO, fast response times of under 1 s and recovery times of 10 s at room temperature were observed. Wavelength and power dependent resistance changes are determined. High sensitivity is achieved for UV radiation below 400 nm which already gives a response S = 1 − Ron/Roff to be about 92 percent at 2.7 mW/cm2.
Metal Oxide Nanomaterials for Chemical Sensors, 2012
ABSTRACT During the last decade, quasi-1D metal oxide nanostructures were proven to be a promisin... more ABSTRACT During the last decade, quasi-1D metal oxide nanostructures were proven to be a promising material platform to design new gas sensing elements. This chapter surveys the recent developments of the analytical devices based on multisensor arrays made of metal oxide nanowires. We briefly discuss the advantages and challenges of electronic noses and the major milestones of their development. We show that evolution of the nanowire based electronic noses follows the same trends: from fabrication of the devices based on discrete nanowires to creation of integrated systems made of nanowire mats and finally realization of a monolithic sensor array made from a single nanowire. The parameters and performance of such analytical systems is reviewed and fabrication protocols are discussed.
Proceedings of IEEE Sensors, 2004., 2004
In this paper, we describe thin nanostructured SnO2:Cu films fabricated by RF magnetron sputterin... more In this paper, we describe thin nanostructured SnO2:Cu films fabricated by RF magnetron sputtering and characterized with a variety of surface analytical techniques. The average grain size of the 200-1000 nm thick films with columnar structure was determined to be 20-100 nm. A slight oxygen deficiency was observed at the film surface by XPS with [O]/[Sn] ratio equal to about 1.6. Based on these films, gas sensor microarrays of the KAMINA (Karlsruhe Micronose) type were built up. The gas sensitivity of the film sensor segments operated at 350°C was found suitable to respond to tested reducing gases (ammonia, acetone, alcohols) with response times of less than 10 sec.