Alex Prikhodko | M.I.E.T - Academia.edu (original) (raw)
Papers by Alex Prikhodko
physica status solidi (c), 2015
ABSTRACT
Nanotechnologies in Russia, 2012
Research results on the synthesis of carbon nanotube arrays using a combined catalyst are pre sen... more Research results on the synthesis of carbon nanotube arrays using a combined catalyst are pre sented. Thanks to optimal synthesis parameters such as temperature, the reagent flow rate, the concentration and type of organometallic compound, and the composition of the catalyst film, a new synthesis method for the arrays of carbon nanotubes (CNTs) of a given topology is developed. The influence of the size effects of topological elements on the characteristics of the CNT arrays is studied. The results of a statistical analysis and research into the CNT morphology by transmission and scanning electron microscopy are shown.
Biomedical Engineering, 2013
Specific conductivity of micron and submicron size composite nanomaterial layers based on biocomp... more Specific conductivity of micron and submicron size composite nanomaterial layers based on biocompatible car boxymethylcellulose matrix and multi walled carbon nanotube filler was studied. An ultra dispersive suspension was applied to soft (aluminum foil, polyimide and polyester, cotton fabric, office paper) and hard (cover glass, silicon) surfaces using a silk screen process. Specific conductivity of layers with thickness within the range 0.5 5 μm was demonstrated to be ~1.2⋅10 4 4⋅10 4 S/m, whereas the highest conductivity of the surface square was approximately 0.2 S. The examined nanomaterial can be used in electronics and biomedical engineering.
Materials Sciences and Applications, 2012
The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi... more The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi-walled carbon nanotubes (MWCNT), both functionalized and non-functionalized, were investigated. In order to obtain the solid-state bulk CNM from the ultradispersed aqueous solutions of 25 wt% BSA and (0.0015-0.04) wt% MWCNT, the methods of nanotechnology and laser technology were used. It is revealed that the CNM density is 10%-20% higher than that of water and the hardness is higher than that of BSA by a factor of 3-6 times. An increase in hardness H v (by Vickers) of CNM correlated with an increase in the concentration of MWCNT, and H v reached ~300 MPa for the case of the non-functionalized MWCNT, while for the case of the functionalized MWCNT, i.e. MWCNT f , H v was 25% lower.
Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques, 2011
ABSTRACT Carbon nanotubes grown on a silicon substrate with an array of FeNiCo20 catalyst islands... more ABSTRACT Carbon nanotubes grown on a silicon substrate with an array of FeNiCo20 catalyst islands are studied using focused ion beam and transmission electron microscopy. A method for preparing cross-sectional samples is proposed, which makes it possible to exclude the destructive effect of the ion beam on surface nanostructures during sample preparation using a microscopic three-dimensional protective barrier.
Surface and Coatings Technology, 2014
Abstract PECVD method with subsequent photolithography process has been used to create different ... more Abstract PECVD method with subsequent photolithography process has been used to create different tailored surfaces of Fe/silica with silicon oxide representative to that formed during recrystallization annealing of Si alloyed steels, i.e. stoichiometric, amorphous and about 50 nm in thickness. The tailored surfaces have been characterized by different analytical techniques like XPS, AES, Raman, FIB-TEM, AFM and mechanical profilometry.
Technical Physics Letters, 2016
The atomic structure of carbon materials is studied using the example of pyrocarbon and boronrich... more The atomic structure of carbon materials is studied using the example of pyrocarbon and boronrich pyrocarbon by means of the method of reconstruction of the wave function in transmission electron microscopy. It is shown that the digital processing of the phase distributions of these functions allows us to find the average distance between the basal planes. Using the method of molecular dynamics for the formation of the test structures and obtaining for them the calculated phase distributions, the effect of depletion of the basal planes of the carbon atoms on the interplanar distance in the pyrocarbon materials is quantified.
Bulletin of the Russian Academy of Sciences: Physics, 2015
Turbostratic structure is studied on the atomic scale via high-resolution transmission electron m... more Turbostratic structure is studied on the atomic scale via high-resolution transmission electron microscopy for the pyrolytic carbon phase of a boron-rich pyrocarbon material. Based on an analysis of the experimental data and simulations of fast electron scattering by a test carbon atomic structure, it is shown that the pyrocarbon can be described as a set of continuous locally bended basal planes.
Turbostratic structure is studied on the atomic scale via highresolution transmission electron m... more Turbostratic structure is studied on the atomic scale via highresolution transmission electron
microscopy for the pyrolytic carbon phase of a boronrich pyrocarbon material. Based on an analysis of the
experimental data and simulations of fast electron scattering by a test carbon atomic structure, it is shown that
the pyrocarbon can be described as a set of continuous locally bended basal planes.
—The atomic structure of carbon materials is studied using the example of pyrocarbon and boron-ri... more —The atomic structure of carbon materials is studied using the example of pyrocarbon and boron-rich pyrocarbon by means of the method of reconstruction of the wave function in transmission electron microscopy. It is shown that the digital processing of the phase distributions of these functions allows us to find the average distance between the basal planes. Using the method of molecular dynamics for the formation of the test structures and obtaining for them the calculated phase distributions, the effect of depletion of the basal planes of the carbon atoms on the interplanar distance in the pyrocarbon materials is quantified.
Specific conductivity of micron and submicronsize composite nanomaterial layers based on biocom... more Specific conductivity of micron and submicronsize composite nanomaterial layers based on biocompatible car
boxymethylcellulose matrix and multiwalled carbon nanotube filler was studied. An ultradispersive suspension
was applied to soft (aluminum foil, polyimide and polyester, cotton fabric, office paper) and hard (cover glass,
silicon) surfaces using a silkscreen process. Specific conductivity of layers with thickness within the range 0.5
5 μm was demonstrated to be ~1.2⋅104^4⋅10^4 S/m, whereas the highest conductivity of the surface square was
approximately 0.2 S. The examined nanomaterial can be used in electronics and biomedical engineering.
This paper reports results of turbostratic pyrolytic carbon structure study using high-resolution... more This paper reports results of turbostratic pyrolytic carbon structure study using high-resolution electron microscopy techniques. We obtained a through-focus series of images and noted that domain-like contrast features were varied depending on defocus of the objective lens. Since these features are commonly explained in terms of the domain model of pyrocarbon structure we carried out exit wave reconstruction to obtain the phase map. The visual appearance of the map indicates that the ribbon-like model more appropriately describes the pyrocarbon structure in comparison to the domain model. In the context of the ribbon-like model we constructed a test carbon structure using the recovered phase map and molecular dynamics modeling. After determination of atomic positions we simulated high-resolution images of the structure. Our calculations demonstrated that high-resolution micrographs showing domain-like image features can be obtained without carbon domains presented in the actual structure. (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
PECVD method with subsequent photolithography process has been used to create different tailored ... more PECVD method with subsequent photolithography process has been used to create different tailored surfaces of Fe/silica with silicon oxide representative to that formed during recrystallization annealing of Si alloyed steels,
i.e. stoichiometric, amorphous and about 50 nm in thickness. The tailored surfaces have been characterized by different analytical techniques like XPS, AES, Raman, FIB-TEM, AFM and mechanical profilometry.
Research results on the synthesis of carbon nanotube arrays using a combined catalyst are present... more Research results on the synthesis of carbon nanotube arrays using a combined catalyst are presented. Thanks to optimal synthesis parameters such as temperature, the reagent flow rate, the concentration and type of organometallic compound, and the composition of the catalyst film, a new synthesis method for the arrays of carbon nanotubes (CNTs) of a given topology is developed. The influence of the size effects of topological elements on the characteristics of the CNT arrays is studied. The results of a statistical analysis and research into the CNT morphology by transmission and scanning electron microscopy are shown.
Carbon nanotubes grown on a silicon substrate with an array of FeNiCo 20 catalyst islands are stu... more Carbon nanotubes grown on a silicon substrate with an array of FeNiCo 20 catalyst islands are studied using focused ion beam and transmission electron microscopy. A method for preparing cross sectional samples is proposed, which makes it possible to exclude the destructive effect of the ion beam on surface
nanostructures during sample preparation using a microscopic three dimensional protective barrier.
The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi... more The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi-walled carbon
nanotubes (MWCNT), both functionalized and non-functionalized, were investigated. In order to obtain the solid-state
bulk CNM from the ultradispersed aqueous solutions of 25 wt% BSA and (0.0015 - 0.04) wt% MWCNT, the methods
of nanotechnology and laser technology were used. It is revealed that the CNM density is 10% - 20% higher than that of
water and the hardness is higher than that of BSA by a factor of 3 - 6 times. An increase in hardness H v (by Vickers) of
CNM correlated with an increase in the concentration of MWCNT, and H v reached ~300 MPa for the case of the
non-functionalized MWCNT, while for the case of the functionalized MWCNT, i.e. MWCNT f , H v was 25% lower.
physica status solidi (c), 2015
ABSTRACT
Nanotechnologies in Russia, 2012
Research results on the synthesis of carbon nanotube arrays using a combined catalyst are pre sen... more Research results on the synthesis of carbon nanotube arrays using a combined catalyst are pre sented. Thanks to optimal synthesis parameters such as temperature, the reagent flow rate, the concentration and type of organometallic compound, and the composition of the catalyst film, a new synthesis method for the arrays of carbon nanotubes (CNTs) of a given topology is developed. The influence of the size effects of topological elements on the characteristics of the CNT arrays is studied. The results of a statistical analysis and research into the CNT morphology by transmission and scanning electron microscopy are shown.
Biomedical Engineering, 2013
Specific conductivity of micron and submicron size composite nanomaterial layers based on biocomp... more Specific conductivity of micron and submicron size composite nanomaterial layers based on biocompatible car boxymethylcellulose matrix and multi walled carbon nanotube filler was studied. An ultra dispersive suspension was applied to soft (aluminum foil, polyimide and polyester, cotton fabric, office paper) and hard (cover glass, silicon) surfaces using a silk screen process. Specific conductivity of layers with thickness within the range 0.5 5 μm was demonstrated to be ~1.2⋅10 4 4⋅10 4 S/m, whereas the highest conductivity of the surface square was approximately 0.2 S. The examined nanomaterial can be used in electronics and biomedical engineering.
Materials Sciences and Applications, 2012
The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi... more The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi-walled carbon nanotubes (MWCNT), both functionalized and non-functionalized, were investigated. In order to obtain the solid-state bulk CNM from the ultradispersed aqueous solutions of 25 wt% BSA and (0.0015-0.04) wt% MWCNT, the methods of nanotechnology and laser technology were used. It is revealed that the CNM density is 10%-20% higher than that of water and the hardness is higher than that of BSA by a factor of 3-6 times. An increase in hardness H v (by Vickers) of CNM correlated with an increase in the concentration of MWCNT, and H v reached ~300 MPa for the case of the non-functionalized MWCNT, while for the case of the functionalized MWCNT, i.e. MWCNT f , H v was 25% lower.
Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques, 2011
ABSTRACT Carbon nanotubes grown on a silicon substrate with an array of FeNiCo20 catalyst islands... more ABSTRACT Carbon nanotubes grown on a silicon substrate with an array of FeNiCo20 catalyst islands are studied using focused ion beam and transmission electron microscopy. A method for preparing cross-sectional samples is proposed, which makes it possible to exclude the destructive effect of the ion beam on surface nanostructures during sample preparation using a microscopic three-dimensional protective barrier.
Surface and Coatings Technology, 2014
Abstract PECVD method with subsequent photolithography process has been used to create different ... more Abstract PECVD method with subsequent photolithography process has been used to create different tailored surfaces of Fe/silica with silicon oxide representative to that formed during recrystallization annealing of Si alloyed steels, i.e. stoichiometric, amorphous and about 50 nm in thickness. The tailored surfaces have been characterized by different analytical techniques like XPS, AES, Raman, FIB-TEM, AFM and mechanical profilometry.
Technical Physics Letters, 2016
The atomic structure of carbon materials is studied using the example of pyrocarbon and boronrich... more The atomic structure of carbon materials is studied using the example of pyrocarbon and boronrich pyrocarbon by means of the method of reconstruction of the wave function in transmission electron microscopy. It is shown that the digital processing of the phase distributions of these functions allows us to find the average distance between the basal planes. Using the method of molecular dynamics for the formation of the test structures and obtaining for them the calculated phase distributions, the effect of depletion of the basal planes of the carbon atoms on the interplanar distance in the pyrocarbon materials is quantified.
Bulletin of the Russian Academy of Sciences: Physics, 2015
Turbostratic structure is studied on the atomic scale via high-resolution transmission electron m... more Turbostratic structure is studied on the atomic scale via high-resolution transmission electron microscopy for the pyrolytic carbon phase of a boron-rich pyrocarbon material. Based on an analysis of the experimental data and simulations of fast electron scattering by a test carbon atomic structure, it is shown that the pyrocarbon can be described as a set of continuous locally bended basal planes.
Turbostratic structure is studied on the atomic scale via highresolution transmission electron m... more Turbostratic structure is studied on the atomic scale via highresolution transmission electron
microscopy for the pyrolytic carbon phase of a boronrich pyrocarbon material. Based on an analysis of the
experimental data and simulations of fast electron scattering by a test carbon atomic structure, it is shown that
the pyrocarbon can be described as a set of continuous locally bended basal planes.
—The atomic structure of carbon materials is studied using the example of pyrocarbon and boron-ri... more —The atomic structure of carbon materials is studied using the example of pyrocarbon and boron-rich pyrocarbon by means of the method of reconstruction of the wave function in transmission electron microscopy. It is shown that the digital processing of the phase distributions of these functions allows us to find the average distance between the basal planes. Using the method of molecular dynamics for the formation of the test structures and obtaining for them the calculated phase distributions, the effect of depletion of the basal planes of the carbon atoms on the interplanar distance in the pyrocarbon materials is quantified.
Specific conductivity of micron and submicronsize composite nanomaterial layers based on biocom... more Specific conductivity of micron and submicronsize composite nanomaterial layers based on biocompatible car
boxymethylcellulose matrix and multiwalled carbon nanotube filler was studied. An ultradispersive suspension
was applied to soft (aluminum foil, polyimide and polyester, cotton fabric, office paper) and hard (cover glass,
silicon) surfaces using a silkscreen process. Specific conductivity of layers with thickness within the range 0.5
5 μm was demonstrated to be ~1.2⋅104^4⋅10^4 S/m, whereas the highest conductivity of the surface square was
approximately 0.2 S. The examined nanomaterial can be used in electronics and biomedical engineering.
This paper reports results of turbostratic pyrolytic carbon structure study using high-resolution... more This paper reports results of turbostratic pyrolytic carbon structure study using high-resolution electron microscopy techniques. We obtained a through-focus series of images and noted that domain-like contrast features were varied depending on defocus of the objective lens. Since these features are commonly explained in terms of the domain model of pyrocarbon structure we carried out exit wave reconstruction to obtain the phase map. The visual appearance of the map indicates that the ribbon-like model more appropriately describes the pyrocarbon structure in comparison to the domain model. In the context of the ribbon-like model we constructed a test carbon structure using the recovered phase map and molecular dynamics modeling. After determination of atomic positions we simulated high-resolution images of the structure. Our calculations demonstrated that high-resolution micrographs showing domain-like image features can be obtained without carbon domains presented in the actual structure. (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
PECVD method with subsequent photolithography process has been used to create different tailored ... more PECVD method with subsequent photolithography process has been used to create different tailored surfaces of Fe/silica with silicon oxide representative to that formed during recrystallization annealing of Si alloyed steels,
i.e. stoichiometric, amorphous and about 50 nm in thickness. The tailored surfaces have been characterized by different analytical techniques like XPS, AES, Raman, FIB-TEM, AFM and mechanical profilometry.
Research results on the synthesis of carbon nanotube arrays using a combined catalyst are present... more Research results on the synthesis of carbon nanotube arrays using a combined catalyst are presented. Thanks to optimal synthesis parameters such as temperature, the reagent flow rate, the concentration and type of organometallic compound, and the composition of the catalyst film, a new synthesis method for the arrays of carbon nanotubes (CNTs) of a given topology is developed. The influence of the size effects of topological elements on the characteristics of the CNT arrays is studied. The results of a statistical analysis and research into the CNT morphology by transmission and scanning electron microscopy are shown.
Carbon nanotubes grown on a silicon substrate with an array of FeNiCo 20 catalyst islands are stu... more Carbon nanotubes grown on a silicon substrate with an array of FeNiCo 20 catalyst islands are studied using focused ion beam and transmission electron microscopy. A method for preparing cross sectional samples is proposed, which makes it possible to exclude the destructive effect of the ion beam on surface
nanostructures during sample preparation using a microscopic three dimensional protective barrier.
The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi... more The properties of the composite nanomaterials (CNM) based on bovine serum albumin (BSA) and multi-walled carbon
nanotubes (MWCNT), both functionalized and non-functionalized, were investigated. In order to obtain the solid-state
bulk CNM from the ultradispersed aqueous solutions of 25 wt% BSA and (0.0015 - 0.04) wt% MWCNT, the methods
of nanotechnology and laser technology were used. It is revealed that the CNM density is 10% - 20% higher than that of
water and the hardness is higher than that of BSA by a factor of 3 - 6 times. An increase in hardness H v (by Vickers) of
CNM correlated with an increase in the concentration of MWCNT, and H v reached ~300 MPa for the case of the
non-functionalized MWCNT, while for the case of the functionalized MWCNT, i.e. MWCNT f , H v was 25% lower.