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V. Labunov

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Field of interest -Micro and nanoelectronics, Material Science, 2D materials. Head of the Lab. "Integrated Micro and Nanosystems" of the Belarusian State University of Informatics and Radioelectronics. Professor of Moscow Engeniaring-Phisical Institute (MEPhY).Doctor of technical sciences, professor, arademician of the Nanional Acadevy of sciences of Belarus, Academician of Russian Acadevy of sciences.

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Mustafa İstanbullu

Cukurova University

University of Cambridge

Karolina Laszczyk

Oksana Chubenko

Brian Gilchrist

University of Michigan

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Papers by V. Labunov

Field Emission Cathodes Based on Structured Carbon Nanotube Arrays

Field emission properties of the structured carbon nanotube cathodes were investigated by field e... more Field emission properties of the structured carbon nanotube cathodes were investigated by field emission scanning microscopy, scanning electron microscopy and integral field emission measurements with luminescence screen. The carbon nanotube arrays were synthesized by the atmospheric pressure floating catalyst chemical vapour deposition method under the high temperature pyrolysis of ferrocene/xylene solution. Varying arrays of carbon nanotube columns and blocks were fabricated on Si, SiO 2 and porous anodic alumina substrates. Well-aligned field emission from nearly 100% of the patches at electric field <10 V/µm in direct current and pulsed mode integrally and locally was observed. High current capabilities up to mA currents for structured carbon nanotube cathodes were achieved. Integral field emission measurements with luminescence screen and processing under N 2 and O 2 exposures of up to 3×10 −5 mbar demonstrated homogeneous current distribution and long-term stability of the structured carbon nanotube cathodes. Index Terms-carbon nanotubes, field emission catchodes, structured carbon nanotube arrays, field emission scanning microscope.

Properties of copper- modified graphene oxide nanocomposites for biomedical applications

Two feasible methods were developed for the preparation of CuS/Cu2O/CuO-GO or CuO-GO nanocomposit... more Two feasible methods were developed for the preparation of CuS/Cu2O/CuO-GO or CuO-GO nanocomposites in the use of the ultrasonic nanotechnology (20 kHz) and oxidized graphene nanomaterial. The CuS/Cu2O/CuO-GO nanocomposites have a submicron size (~ 490 nm) with small spherical nanostructures (~ 30 nm) on their surface. In contrast, CuO-GO nanocomposites exhibit a distinct cone-like morphology (~ 20 nm) in the graphene network. The XRD studies reveal the crystalline phases of CuS, Cu2O and CuO in the first type of graphene nanomaterial, and distinct reflexes of the CuO phase in the second type of nanocomposite

Interrelation of Planck Thermal Glow with Current Saturation Effect of Carbon Nanotube Field Emitters

Physics, Chemistry and Application of Nanostructures, 2017

The interrelation of the emission current saturation effect with Planck glow in the visible spect... more The interrelation of the emission current saturation effect with Planck glow in the visible spectral range of the matrix field emission carbon nanotube based cathodes was investigated. It was found that the beginning of the glow in the visible spectral range corresponds to the beginning of the transition into the emission current saturation mode. It was found that the main reason for the emission current saturation is high internal resistance of carbon nanotubes and its contact with substrate.

Structural, chemical and magnetic properties of anisotropic ferromagnetic Fe nanoparticles inserted into carbon nanotubes

SOME ELECTRICAL PROPERTIES OF Te FILMS AND Al-Al2O3-Te TUNNEL JUNCTIONS

: Tellurium evaporated onto pyrex substrates at room temperature is a polycrystalline p-type semi... more : Tellurium evaporated onto pyrex substrates at room temperature is a polycrystalline p-type semiconductor with an energy gap equal to that for a single crystal Te. Its conduction properties are dominated by impurity band conduction with a mobility of 20 sq. cm/volt sec at room temperature and to carrier density of 10 ti the 18th power holes/cc. Current-voltage characteristics of Al-Al2O3-Te tunnel junctions cannot be interpreted in terms of simple tunneling models, but do indicate some band structure effects which are largely masked by the presence of excess currents. (Author)

Accumulation of porous silicon combustion energy for mechanical pulse enhancement in mems

Field emission properties of Ex-situ and In-situ iron catalyst-grown carbon nanotubes

2017 IEEE 12th Nanotechnology Materials and Devices Conference (NMDC), 2017

Carbon Nanotubes (CNTs) are grown using ex-situ and in-situ iron catalyst sources, and their resp... more Carbon Nanotubes (CNTs) are grown using ex-situ and in-situ iron catalyst sources, and their respective Field Emission (FE) properties are investigated. At similar CNT heights (~16 µm), it is found that in-situ catalyst-grown CNT film shows better FE properties than ex-situ catalyst-grown CNT film. At the same time, it is found that in-situ CNTs show enlarged tips, forming "thumbtack"-shaped CNT tips. From the simulation study, enlarged CNT tip emits higher FE current, possibly due to the larger emission area. The obtained results demonstrated that in-situ catalyst-grown CNTs show better FE properties than ex-situ catalyst-grown CNTs.

Simulation of resonant excitation of electromechanical vibrations in carbon nanotube radio receiver

… CriMiCo), 2011 21th …, 2011

... Минск, 220013, Беларусь тел.: +375-17-2939322, e-mail: [email protected] 2Белорусский государ... more ... Минск, 220013, Беларусь тел.: +375-17-2939322, e-mail: [email protected] 2Белорусский государственный университет информатики и радиоэлектроники ул. П. ... [8] Acoustic properties of carbon nanotube arrays as chemical sensor elements / VV Barkaline et al. ...

Computational Exploration on the Application of Carbon Nanotubes in Planar Helix Slow-Wave Structure Traveling-Wave Tube

The reduction of graphene from graphene oxide

III. CONCLUSIONS Fabrication process of sensor based on anodic alumina has been developed. It has... more III. CONCLUSIONS Fabrication process of sensor based on anodic alumina has been developed. It has been found that increasing number of cantilever beams and oxide thickness decreases sensitivity value. Adding one additional console reduces sensitivity by 75%, and two-by 90%. Increasing the thickness of the anodic oxide film by 10 µm, reduces the sensitivity by 30%. By varying the parameters of the anodizing can change the sensitivity range of the active element sensors in a wide range of values.

Influence of radiation-stimulated diffusion on the sputtering of silicon by low-energy ions

Silicon single crystals were doped homogeneously with boron or phosphorus. When these crystals we... more Silicon single crystals were doped homogeneously with boron or phosphorus. When these crystals were bombarded with 0.4 keV argon ions, the sputtering coefficient decreased between 300--350 /sup 0/C and 600 /sup 0/C. This was attributed to radiation-stimulated diffusion of the boron and phosphorus impurities, which restored the original structure of the surface layer and thus reduced the sputtering coefficient. (AIP)

Femtosecond laser modification of an array of vertically aligned carbon nanotubes intercalated with Fe phase nanoparticles

by Serguei Filatov and V. Labunov

Nanoscale Research Letters, 2013

Femtosecond lasers (FSL) are playing an increasingly important role in materials research, charac... more Femtosecond lasers (FSL) are playing an increasingly important role in materials research, characterization, and modification. Due to an extremely short pulse width, interactions of FSL irradiation with solid surfaces attract special interest, and a number of unusual phenomena resulted in the formation of new materials are expected. Here, we report on a new nanostructure observed after the interaction of FSL irradiation with arrays of vertically aligned carbon nanotubes (CNTs) intercalated with iron phase catalyst nanoparticles. It was revealed that the FSL laser ablation transforms the topmost layer of CNT array into iron phase nanospheres (40 to 680 nm in diameter) located at the tip of the CNT bundles of conical shape. Besides, the smaller nanospheres (10 to 30 nm in diameter) are found to be beaded at the sides of these bundles. Some of the larger nanospheres are encapsulated into carbon shells, which sometime are found to contain CNTs. The mechanism of creation of such nanostru...

Femtosecond laser modification of an array of vertically aligned carbon nanotubes intercalated with Fe phase nanoparticles

Nanoscale Research Letters, 2013

Femtosecond lasers (FSL) are playing an increasingly important role in materials research, charac... more Femtosecond lasers (FSL) are playing an increasingly important role in materials research, characterization, and modification. Due to an extremely short pulse width, interactions of FSL irradiation with solid surfaces attract special interest, and a number of unusual phenomena resulted in the formation of new materials are expected. Here, we report on a new nanostructure observed after the interaction of FSL irradiation with arrays of vertically aligned carbon nanotubes (CNTs) intercalated with iron phase catalyst nanoparticles. It was revealed that the FSL laser ablation transforms the topmost layer of CNT array into iron phase nanospheres (40 to 680 nm in diameter) located at the tip of the CNT bundles of conical shape. Besides, the smaller nanospheres (10 to 30 nm in diameter) are found to be beaded at the sides of these bundles. Some of the larger nanospheres are encapsulated into carbon shells, which sometime are found to contain CNTs. The mechanism of creation of such nanostru...

Ultrasonic Formation of Copper/Iron-Modified Graphene Oxide for Ketorolac Delivery

International Journal of Nanoscience

New accessible sonochemical methods were developed for the functionalization of synthesized graph... more New accessible sonochemical methods were developed for the functionalization of synthesized graphene oxide (GO) with copper/iron compounds and drug intercalation into their structure in aqueous solution at ambient conditions by using ultrasound (20[Formula: see text]kHz) treatment. The sonochemical formation mechanism of a new nanomaterial was revealed through the structural analysis of three types of nanocomposites: (i) copper@graphene oxide, (ii) copper/iron@graphene oxide and (iii) iron@graphene oxide. Unique copper/iron-modified graphene oxide nanocomposites can be used as nanocarriers for the anti-inflammatory drug (ketorolac) delivery in aqueous solution due to the reduced submicron size and enlarged surface area. Disintegration of the ultrasonically intercalated ketorolac followed the exponential decay curve fit at higher pH values of the aqueous solution with a higher decay constant observed in copper/iron-modified graphene oxide nanocomposites.

Operating voltage diminution of field emission cathodes based on carbon nanotubes

IOP Conference Series: Materials Science and Engineering

The possibility of minimizing the operating voltages of the diode structure with a field emission... more The possibility of minimizing the operating voltages of the diode structure with a field emission cathode based on an array of carbon nanotubes is investigated. The numerical simulation method was used to perform theoretical calculations that showed the potential for an unlimited reduction in the operating voltage by reducing the diameter of the emitters, increasing the height of the emitters and reducing the value of the interelectrode gap. Established deviation of the experimental values of the operating voltage from theoretically calculated when approaching in the interelectrode gap near to values commensurate with the height of the emitters. It is shown that the observed effect is caused by low conductivity of multi-walled carbon nanotubes, high contact resistance with a substrate, as well as micro-and macroinhomogeneities of the structure of an array of carbon nanotubes.

Limiting currents of matrix field emission cathodes based on carbon nanotubes

IOP Conference Series: Materials Science and Engineering

The limiting emission currents of matrix field cathodes based on carbon nanotubes are investigate... more The limiting emission currents of matrix field cathodes based on carbon nanotubes are investigated for their dependence on the cathode working area, as well as the features of the Fowler-Nordheim curves in cyclic measurements of the I-V characteristics under cyclic measurements of CVC. The migration of the thermal overload region of emitters with a temperature of more than 1500 K (with emission in the visible spectral range) on the surface of a matrix cathode is set, as well as two types of divergence of the Fowler-Nordheim curves under cyclic measurements of CVC.

Influence of Magnetic Losses on Microwave Absorption by Carbon-Nanotube Nanocomposites with a Low Concentration of Ferromagnetic Nanoparticles

Journal of Applied Spectroscopy, 2016

P-120: High Efficiency Method of Selective CNT Arrays Growth on the Metal/Dielectric/Semiconductor Substrates for FEDs Application

SID Symposium Digest of Technical Papers, 2006

ABSTRACT Multi-wall carbon nanotube (CNT) arrays growth by the atmospheric pressure CVD process o... more ABSTRACT Multi-wall carbon nanotube (CNT) arrays growth by the atmospheric pressure CVD process of thermal decomposition of fluid (o- and p-xylole C8H10) hydrocarbons in the presence of volatile catalysts (ferrocene Fe(C5H5)2) with the use of Ar as a gas-carrier on the top of different metal/dielectric/semiconductor (MDS) structures, in particular Si/SiO2, Ti/SiO2/Si, Al2O3 matrix/Ni catalyst has been investigated for the FEDs application. The obtained results are showing that the CNTs growth selectivity and density of CNTs packing can be managed under certain conditions. At the investigated types of surfaces the vertically aligned close-packed and preferably oriented low density CNT arrays have been obtained as well as single CNTs in the pores of nanoporous Al2O3 matrix with Ni catalyst.

Modeling of diffusion of magnesium in gallium arsenide. 1. Thermal diffusion of Mg in AlxGa1?xAs

Journal of Engineering Physics and Thermophysics, 1995

A model is developed and an equation is derived for magnesium diffusion in gallium arsenide. Nume... more A model is developed and an equation is derived for magnesium diffusion in gallium arsenide. Numerical modeling of AlâGa{sub 1-x}As doping has shown that the suggested model makes it possible to adequately describe all distinctive features of the profile of magnesium atom distribution in thermal diffusion.

Modeling of magnesium diffusion in gallium arsenide. 2. Redistribution of ion-implanted impurity

Journal of Engineering Physics and Thermophysics, 1995

The redistribution of ion-implanted magnesium under high-rate annealing conditions is calculated.... more The redistribution of ion-implanted magnesium under high-rate annealing conditions is calculated. Consideration of the nonuniformity of the interstitial gallium atom distribution makes it possible to explain ``ascending'' diffusion in the region of strong distortions of a crystalline lattice.

Field Emission Cathodes Based on Structured Carbon Nanotube Arrays

Field emission properties of the structured carbon nanotube cathodes were investigated by field e... more Field emission properties of the structured carbon nanotube cathodes were investigated by field emission scanning microscopy, scanning electron microscopy and integral field emission measurements with luminescence screen. The carbon nanotube arrays were synthesized by the atmospheric pressure floating catalyst chemical vapour deposition method under the high temperature pyrolysis of ferrocene/xylene solution. Varying arrays of carbon nanotube columns and blocks were fabricated on Si, SiO 2 and porous anodic alumina substrates. Well-aligned field emission from nearly 100% of the patches at electric field <10 V/µm in direct current and pulsed mode integrally and locally was observed. High current capabilities up to mA currents for structured carbon nanotube cathodes were achieved. Integral field emission measurements with luminescence screen and processing under N 2 and O 2 exposures of up to 3×10 −5 mbar demonstrated homogeneous current distribution and long-term stability of the structured carbon nanotube cathodes. Index Terms-carbon nanotubes, field emission catchodes, structured carbon nanotube arrays, field emission scanning microscope.

Properties of copper- modified graphene oxide nanocomposites for biomedical applications

Two feasible methods were developed for the preparation of CuS/Cu2O/CuO-GO or CuO-GO nanocomposit... more Two feasible methods were developed for the preparation of CuS/Cu2O/CuO-GO or CuO-GO nanocomposites in the use of the ultrasonic nanotechnology (20 kHz) and oxidized graphene nanomaterial. The CuS/Cu2O/CuO-GO nanocomposites have a submicron size (~ 490 nm) with small spherical nanostructures (~ 30 nm) on their surface. In contrast, CuO-GO nanocomposites exhibit a distinct cone-like morphology (~ 20 nm) in the graphene network. The XRD studies reveal the crystalline phases of CuS, Cu2O and CuO in the first type of graphene nanomaterial, and distinct reflexes of the CuO phase in the second type of nanocomposite

Interrelation of Planck Thermal Glow with Current Saturation Effect of Carbon Nanotube Field Emitters

Physics, Chemistry and Application of Nanostructures, 2017

The interrelation of the emission current saturation effect with Planck glow in the visible spect... more The interrelation of the emission current saturation effect with Planck glow in the visible spectral range of the matrix field emission carbon nanotube based cathodes was investigated. It was found that the beginning of the glow in the visible spectral range corresponds to the beginning of the transition into the emission current saturation mode. It was found that the main reason for the emission current saturation is high internal resistance of carbon nanotubes and its contact with substrate.

Structural, chemical and magnetic properties of anisotropic ferromagnetic Fe nanoparticles inserted into carbon nanotubes

SOME ELECTRICAL PROPERTIES OF Te FILMS AND Al-Al2O3-Te TUNNEL JUNCTIONS

: Tellurium evaporated onto pyrex substrates at room temperature is a polycrystalline p-type semi... more : Tellurium evaporated onto pyrex substrates at room temperature is a polycrystalline p-type semiconductor with an energy gap equal to that for a single crystal Te. Its conduction properties are dominated by impurity band conduction with a mobility of 20 sq. cm/volt sec at room temperature and to carrier density of 10 ti the 18th power holes/cc. Current-voltage characteristics of Al-Al2O3-Te tunnel junctions cannot be interpreted in terms of simple tunneling models, but do indicate some band structure effects which are largely masked by the presence of excess currents. (Author)

Accumulation of porous silicon combustion energy for mechanical pulse enhancement in mems

Field emission properties of Ex-situ and In-situ iron catalyst-grown carbon nanotubes

2017 IEEE 12th Nanotechnology Materials and Devices Conference (NMDC), 2017

Carbon Nanotubes (CNTs) are grown using ex-situ and in-situ iron catalyst sources, and their resp... more Carbon Nanotubes (CNTs) are grown using ex-situ and in-situ iron catalyst sources, and their respective Field Emission (FE) properties are investigated. At similar CNT heights (~16 µm), it is found that in-situ catalyst-grown CNT film shows better FE properties than ex-situ catalyst-grown CNT film. At the same time, it is found that in-situ CNTs show enlarged tips, forming "thumbtack"-shaped CNT tips. From the simulation study, enlarged CNT tip emits higher FE current, possibly due to the larger emission area. The obtained results demonstrated that in-situ catalyst-grown CNTs show better FE properties than ex-situ catalyst-grown CNTs.

Simulation of resonant excitation of electromechanical vibrations in carbon nanotube radio receiver

… CriMiCo), 2011 21th …, 2011

... Минск, 220013, Беларусь тел.: +375-17-2939322, e-mail: [email protected] 2Белорусский государ... more ... Минск, 220013, Беларусь тел.: +375-17-2939322, e-mail: [email protected] 2Белорусский государственный университет информатики и радиоэлектроники ул. П. ... [8] Acoustic properties of carbon nanotube arrays as chemical sensor elements / VV Barkaline et al. ...

Computational Exploration on the Application of Carbon Nanotubes in Planar Helix Slow-Wave Structure Traveling-Wave Tube

The reduction of graphene from graphene oxide

III. CONCLUSIONS Fabrication process of sensor based on anodic alumina has been developed. It has... more III. CONCLUSIONS Fabrication process of sensor based on anodic alumina has been developed. It has been found that increasing number of cantilever beams and oxide thickness decreases sensitivity value. Adding one additional console reduces sensitivity by 75%, and two-by 90%. Increasing the thickness of the anodic oxide film by 10 µm, reduces the sensitivity by 30%. By varying the parameters of the anodizing can change the sensitivity range of the active element sensors in a wide range of values.

Influence of radiation-stimulated diffusion on the sputtering of silicon by low-energy ions

Silicon single crystals were doped homogeneously with boron or phosphorus. When these crystals we... more Silicon single crystals were doped homogeneously with boron or phosphorus. When these crystals were bombarded with 0.4 keV argon ions, the sputtering coefficient decreased between 300--350 /sup 0/C and 600 /sup 0/C. This was attributed to radiation-stimulated diffusion of the boron and phosphorus impurities, which restored the original structure of the surface layer and thus reduced the sputtering coefficient. (AIP)

Femtosecond laser modification of an array of vertically aligned carbon nanotubes intercalated with Fe phase nanoparticles

by Serguei Filatov and V. Labunov

Nanoscale Research Letters, 2013

Femtosecond lasers (FSL) are playing an increasingly important role in materials research, charac... more Femtosecond lasers (FSL) are playing an increasingly important role in materials research, characterization, and modification. Due to an extremely short pulse width, interactions of FSL irradiation with solid surfaces attract special interest, and a number of unusual phenomena resulted in the formation of new materials are expected. Here, we report on a new nanostructure observed after the interaction of FSL irradiation with arrays of vertically aligned carbon nanotubes (CNTs) intercalated with iron phase catalyst nanoparticles. It was revealed that the FSL laser ablation transforms the topmost layer of CNT array into iron phase nanospheres (40 to 680 nm in diameter) located at the tip of the CNT bundles of conical shape. Besides, the smaller nanospheres (10 to 30 nm in diameter) are found to be beaded at the sides of these bundles. Some of the larger nanospheres are encapsulated into carbon shells, which sometime are found to contain CNTs. The mechanism of creation of such nanostru...

Femtosecond laser modification of an array of vertically aligned carbon nanotubes intercalated with Fe phase nanoparticles

Nanoscale Research Letters, 2013

Femtosecond lasers (FSL) are playing an increasingly important role in materials research, charac... more Femtosecond lasers (FSL) are playing an increasingly important role in materials research, characterization, and modification. Due to an extremely short pulse width, interactions of FSL irradiation with solid surfaces attract special interest, and a number of unusual phenomena resulted in the formation of new materials are expected. Here, we report on a new nanostructure observed after the interaction of FSL irradiation with arrays of vertically aligned carbon nanotubes (CNTs) intercalated with iron phase catalyst nanoparticles. It was revealed that the FSL laser ablation transforms the topmost layer of CNT array into iron phase nanospheres (40 to 680 nm in diameter) located at the tip of the CNT bundles of conical shape. Besides, the smaller nanospheres (10 to 30 nm in diameter) are found to be beaded at the sides of these bundles. Some of the larger nanospheres are encapsulated into carbon shells, which sometime are found to contain CNTs. The mechanism of creation of such nanostru...

Ultrasonic Formation of Copper/Iron-Modified Graphene Oxide for Ketorolac Delivery

International Journal of Nanoscience

New accessible sonochemical methods were developed for the functionalization of synthesized graph... more New accessible sonochemical methods were developed for the functionalization of synthesized graphene oxide (GO) with copper/iron compounds and drug intercalation into their structure in aqueous solution at ambient conditions by using ultrasound (20[Formula: see text]kHz) treatment. The sonochemical formation mechanism of a new nanomaterial was revealed through the structural analysis of three types of nanocomposites: (i) copper@graphene oxide, (ii) copper/iron@graphene oxide and (iii) iron@graphene oxide. Unique copper/iron-modified graphene oxide nanocomposites can be used as nanocarriers for the anti-inflammatory drug (ketorolac) delivery in aqueous solution due to the reduced submicron size and enlarged surface area. Disintegration of the ultrasonically intercalated ketorolac followed the exponential decay curve fit at higher pH values of the aqueous solution with a higher decay constant observed in copper/iron-modified graphene oxide nanocomposites.

Operating voltage diminution of field emission cathodes based on carbon nanotubes

IOP Conference Series: Materials Science and Engineering

The possibility of minimizing the operating voltages of the diode structure with a field emission... more The possibility of minimizing the operating voltages of the diode structure with a field emission cathode based on an array of carbon nanotubes is investigated. The numerical simulation method was used to perform theoretical calculations that showed the potential for an unlimited reduction in the operating voltage by reducing the diameter of the emitters, increasing the height of the emitters and reducing the value of the interelectrode gap. Established deviation of the experimental values of the operating voltage from theoretically calculated when approaching in the interelectrode gap near to values commensurate with the height of the emitters. It is shown that the observed effect is caused by low conductivity of multi-walled carbon nanotubes, high contact resistance with a substrate, as well as micro-and macroinhomogeneities of the structure of an array of carbon nanotubes.

Limiting currents of matrix field emission cathodes based on carbon nanotubes

IOP Conference Series: Materials Science and Engineering

The limiting emission currents of matrix field cathodes based on carbon nanotubes are investigate... more The limiting emission currents of matrix field cathodes based on carbon nanotubes are investigated for their dependence on the cathode working area, as well as the features of the Fowler-Nordheim curves in cyclic measurements of the I-V characteristics under cyclic measurements of CVC. The migration of the thermal overload region of emitters with a temperature of more than 1500 K (with emission in the visible spectral range) on the surface of a matrix cathode is set, as well as two types of divergence of the Fowler-Nordheim curves under cyclic measurements of CVC.

Influence of Magnetic Losses on Microwave Absorption by Carbon-Nanotube Nanocomposites with a Low Concentration of Ferromagnetic Nanoparticles

Journal of Applied Spectroscopy, 2016

P-120: High Efficiency Method of Selective CNT Arrays Growth on the Metal/Dielectric/Semiconductor Substrates for FEDs Application

SID Symposium Digest of Technical Papers, 2006

ABSTRACT Multi-wall carbon nanotube (CNT) arrays growth by the atmospheric pressure CVD process o... more ABSTRACT Multi-wall carbon nanotube (CNT) arrays growth by the atmospheric pressure CVD process of thermal decomposition of fluid (o- and p-xylole C8H10) hydrocarbons in the presence of volatile catalysts (ferrocene Fe(C5H5)2) with the use of Ar as a gas-carrier on the top of different metal/dielectric/semiconductor (MDS) structures, in particular Si/SiO2, Ti/SiO2/Si, Al2O3 matrix/Ni catalyst has been investigated for the FEDs application. The obtained results are showing that the CNTs growth selectivity and density of CNTs packing can be managed under certain conditions. At the investigated types of surfaces the vertically aligned close-packed and preferably oriented low density CNT arrays have been obtained as well as single CNTs in the pores of nanoporous Al2O3 matrix with Ni catalyst.

Modeling of diffusion of magnesium in gallium arsenide. 1. Thermal diffusion of Mg in AlxGa1?xAs

Journal of Engineering Physics and Thermophysics, 1995

A model is developed and an equation is derived for magnesium diffusion in gallium arsenide. Nume... more A model is developed and an equation is derived for magnesium diffusion in gallium arsenide. Numerical modeling of AlâGa{sub 1-x}As doping has shown that the suggested model makes it possible to adequately describe all distinctive features of the profile of magnesium atom distribution in thermal diffusion.

Modeling of magnesium diffusion in gallium arsenide. 2. Redistribution of ion-implanted impurity

Journal of Engineering Physics and Thermophysics, 1995

The redistribution of ion-implanted magnesium under high-rate annealing conditions is calculated.... more The redistribution of ion-implanted magnesium under high-rate annealing conditions is calculated. Consideration of the nonuniformity of the interstitial gallium atom distribution makes it possible to explain ``ascending'' diffusion in the region of strong distortions of a crystalline lattice.