The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform

Vasyl O. Kharchenko - One of the best experts on this subject based on the ideXlab platform.

  • Nano-sized Adsorbate Island Formation in Adsorptive Anisotropic Multilayer Systems
    Springer Proceedings in Physics, 2019
    Co-Authors: Vasyl O. Kharchenko, Alina V. Dvornichenko, Dmitrii O. Kharchenko
    Abstract:

    We derive the generalized model of multilayer adsorptive System describing pattern formation on a surface of thin films during adsorption/desorption processes at condensation from gaseous phase and in plasma-Condensate Systems by taking into account transference reactions between layers. We discuss isotropic and anisotropic diffusion of adsorbate between layers, separately, in the framework of theoretical study and numerical simulations. It is shown that in multilayer adsorptive System, a cascade of first-order phase transitions is realized, and the number of such phase transitions is defined by the number of layers. We show that in the isotropic case of the standard vertical diffusion, an increase in the adsorption coefficient leads to a change in the surface morphology. In anisotropic gas-Condensate System with preferential motion of adatoms from upper layers to lower ones, we define conditions for the adsorbate island formation. We discuss an influence of the anisotropy strength onto critical size of adsorbate islands and perform statistical analysis of the multilayer surface structures. By considering plasma-Condensate Systems, we show that an increase in the anisotropy strength leads to both the transformation of the surface morphology from separated nano-holes inside adsorbate matrix toward separated adsorbate islands and decrease in the linear size of adsorbate islands.

  • Islands growth control in adsorptive multilayer plasma-Condensate Systems
    Journal of Crystal Growth, 2019
    Co-Authors: Alina V. Dvornichenko, Dmitrii O. Kharchenko, Iryna O. Lysenko, Vasyl O. Kharchenko
    Abstract:

    Abstract A model for adsorbate islands growth is proposed to simulate pattern formation in multilayer plasma-Condensate System. It was shown that morphology of surface patterns and mean island size can be effectively controlled by adsorption rate (pressure of gaseous atmosphere), interaction strength of adsorbate and external electrical field, managing anisotropic diffusion of atoms between layers. Dynamics of patterns formation is analyzed by considering statistical properties of growing surface on each formed layer and mean island size having size from third up to two diffusion lengths of adatoms. It was shown that island growth relates to modified Ostawald ripening scenario with universal island size distribution. Obtained data relates well to experimental observation of adsorbate island formation at condensation of metals and semiconductors. Described model and results are general and can be used to describe real experimental observations of surface nanopatterning at condensation in plasma-Condensate devices.

  • Nano-structured thin films growth in stochastic plasma-Condensate Systems
    arXiv: Mesoscale and Nanoscale Physics, 2018
    Co-Authors: Vasyl O. Kharchenko, Alina V. Dvornichenko
    Abstract:

    We derive the stochastic model of plasma-Condensate Systems by taking into account anisotropy in transference of adatoms between neighbor layers and by introducing fluctuations of adsorbate flux. We show, that by varying the fluctuation's intensity on can govern dynamics of pattern formation on intermediate layer of multi-layer plasma-Condensate System. It is shown that the morphology of the growing surface, type of surface structures and their linear size can be controlled by the intensity of the adsorbate flux fluctuations.

  • Formation of adsorbate structures induced by external electric field in plasma-Condensate Systems
    European Physical Journal B, 2018
    Co-Authors: Vasyl O. Kharchenko, Alina V. Dvornichenko, Vadym N. Borysiuk
    Abstract:

    We present a new model of plasma-Condensate System, by taking into account an anisotropy of transference reactions of adatoms between neighbor layers of multi-layer System, caused by the strength of the electric field near substrate. We discuss an influence of the strength of the electric field onto first-order phase transitions and conditions for adsorbate patterning in plasma-Condensate Systems. It is shown that separated pyramidal-like multi-layer adsorbate islands can be formed in the plasma-Condensate System if the strength of the electric field near substrate becomes larger tan the critical value, which depends on the interaction energy of adsorbate and adsorption coefficient.

  • Formation of Nano-Sized Surface Structures in Adsorptive Multi-Layer Systems
    2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP), 2018
    Co-Authors: Alina V. Dvornichenko, Vasyl O. Kharchenko, Iryna O. Lysenko
    Abstract:

    We derive the generalized model of multi-layer adsorptive System describing pattern formation on a surface of thing films during adsorption/desorption processes at condensation from gaseous phase and in plasma-Condensate Systems by taking into account transference reactions between layers. We discuss isotropic and anisotropic diffusion of adsorbate between layers, separately, in the framework of theoretical study and numerical simulations. In the isotropic case of the standard vertical diffusion we show that an increase in the adsorption coefficient leads to a change in the surface morphology. In anisotropic gas-Condensate System with preferential motion of adatoms from lower layers to upper ones we define conditions for the adsorbate island formation We discuss an influence of the anisotropy strength onto critical size of adsorbate islands and perform statistical analysis of the multilayer surface structures. By considering plasma-Condensate Systems we show that an increase in the anisotropy strength leads to the transformation of the surface morphology and decrease in the linear size of adsorbate islands.

Alina V. Dvornichenko - One of the best experts on this subject based on the ideXlab platform.

  • Nano-sized Adsorbate Island Formation in Adsorptive Anisotropic Multilayer Systems
    Springer Proceedings in Physics, 2019
    Co-Authors: Vasyl O. Kharchenko, Alina V. Dvornichenko, Dmitrii O. Kharchenko
    Abstract:

    We derive the generalized model of multilayer adsorptive System describing pattern formation on a surface of thin films during adsorption/desorption processes at condensation from gaseous phase and in plasma-Condensate Systems by taking into account transference reactions between layers. We discuss isotropic and anisotropic diffusion of adsorbate between layers, separately, in the framework of theoretical study and numerical simulations. It is shown that in multilayer adsorptive System, a cascade of first-order phase transitions is realized, and the number of such phase transitions is defined by the number of layers. We show that in the isotropic case of the standard vertical diffusion, an increase in the adsorption coefficient leads to a change in the surface morphology. In anisotropic gas-Condensate System with preferential motion of adatoms from upper layers to lower ones, we define conditions for the adsorbate island formation. We discuss an influence of the anisotropy strength onto critical size of adsorbate islands and perform statistical analysis of the multilayer surface structures. By considering plasma-Condensate Systems, we show that an increase in the anisotropy strength leads to both the transformation of the surface morphology from separated nano-holes inside adsorbate matrix toward separated adsorbate islands and decrease in the linear size of adsorbate islands.

  • Islands growth control in adsorptive multilayer plasma-Condensate Systems
    Journal of Crystal Growth, 2019
    Co-Authors: Alina V. Dvornichenko, Dmitrii O. Kharchenko, Iryna O. Lysenko, Vasyl O. Kharchenko
    Abstract:

    Abstract A model for adsorbate islands growth is proposed to simulate pattern formation in multilayer plasma-Condensate System. It was shown that morphology of surface patterns and mean island size can be effectively controlled by adsorption rate (pressure of gaseous atmosphere), interaction strength of adsorbate and external electrical field, managing anisotropic diffusion of atoms between layers. Dynamics of patterns formation is analyzed by considering statistical properties of growing surface on each formed layer and mean island size having size from third up to two diffusion lengths of adatoms. It was shown that island growth relates to modified Ostawald ripening scenario with universal island size distribution. Obtained data relates well to experimental observation of adsorbate island formation at condensation of metals and semiconductors. Described model and results are general and can be used to describe real experimental observations of surface nanopatterning at condensation in plasma-Condensate devices.

  • Nano-structured thin films growth in stochastic plasma-Condensate Systems
    arXiv: Mesoscale and Nanoscale Physics, 2018
    Co-Authors: Vasyl O. Kharchenko, Alina V. Dvornichenko
    Abstract:

    We derive the stochastic model of plasma-Condensate Systems by taking into account anisotropy in transference of adatoms between neighbor layers and by introducing fluctuations of adsorbate flux. We show, that by varying the fluctuation's intensity on can govern dynamics of pattern formation on intermediate layer of multi-layer plasma-Condensate System. It is shown that the morphology of the growing surface, type of surface structures and their linear size can be controlled by the intensity of the adsorbate flux fluctuations.

  • Formation of adsorbate structures induced by external electric field in plasma-Condensate Systems
    European Physical Journal B, 2018
    Co-Authors: Vasyl O. Kharchenko, Alina V. Dvornichenko, Vadym N. Borysiuk
    Abstract:

    We present a new model of plasma-Condensate System, by taking into account an anisotropy of transference reactions of adatoms between neighbor layers of multi-layer System, caused by the strength of the electric field near substrate. We discuss an influence of the strength of the electric field onto first-order phase transitions and conditions for adsorbate patterning in plasma-Condensate Systems. It is shown that separated pyramidal-like multi-layer adsorbate islands can be formed in the plasma-Condensate System if the strength of the electric field near substrate becomes larger tan the critical value, which depends on the interaction energy of adsorbate and adsorption coefficient.

  • Formation of Nano-Sized Surface Structures in Adsorptive Multi-Layer Systems
    2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP), 2018
    Co-Authors: Alina V. Dvornichenko, Vasyl O. Kharchenko, Iryna O. Lysenko
    Abstract:

    We derive the generalized model of multi-layer adsorptive System describing pattern formation on a surface of thing films during adsorption/desorption processes at condensation from gaseous phase and in plasma-Condensate Systems by taking into account transference reactions between layers. We discuss isotropic and anisotropic diffusion of adsorbate between layers, separately, in the framework of theoretical study and numerical simulations. In the isotropic case of the standard vertical diffusion we show that an increase in the adsorption coefficient leads to a change in the surface morphology. In anisotropic gas-Condensate System with preferential motion of adatoms from lower layers to upper ones we define conditions for the adsorbate island formation We discuss an influence of the anisotropy strength onto critical size of adsorbate islands and perform statistical analysis of the multilayer surface structures. By considering plasma-Condensate Systems we show that an increase in the anisotropy strength leads to the transformation of the surface morphology and decrease in the linear size of adsorbate islands.

Yu. A. Kosminskaya - One of the best experts on this subject based on the ideXlab platform.

  • Self-organization of plasma-Condensate quasi-equilibrium Systems
    Physics of the Solid State, 2009
    Co-Authors: V. I. Perekrestov, A. S. Kornyushchenko, A. I. Olemskoĭ, Yu. A. Kosminskaya
    Abstract:

    The steady-state regime of condensation under conditions close to the phase equilibrium is shown to be provided by the self-organization of the plasma-Condensate System. This self-organization is associated with the fact that the presence of the plasma leads to a considerable increase in the energy of adatoms and, hence, in the temperature of the growth surface in the course of their condensation. The increase in the temperature is compensated by the desorption flow of adatoms responsible for the supersaturation. It is demonstrated that the proximity of the System to the phase equilibrium ensures the selective regime of condensation during which the adatoms are attached onto active centers of the growth surface, thus forming various three-dimensional structures.

  • Selective processes that proceed during formation of aluminum layers near the phase equilibrium in a plasma-Condensate System
    Technical Physics, 2008
    Co-Authors: V. I. Perekrestov, A. S. Kornyushchenko, Yu. A. Kosminskaya
    Abstract:

    The mechanisms of pore formation in aluminum Condensates produced using a radically new technological approach that is based on self-organized sputtering Systems are studied. The main technological parameters of pore formation are found to be determined by the closeness to the phase equilibrium in the plasma-Condensate System and by the predominant contribution of structural or field selectivity to atom-by-atom assembling of the Condensate.

  • Regularities of Al layer structure formation near phase equilibrium in plasma-Condensate System
    Physics of the Solid State, 2008
    Co-Authors: V. I. Perekrestov, A. S. Kornyushchenko, Yu. A. Kosminskaya
    Abstract:

    A fundamentally new technological approach to creating porous metal structures on isotropic substrates during condensation of a reverse diffusion flow in a planar dc magnetron is proposed. The physical foundations of the operation of self-organized sputtering Systems are analyzed. Conditions of the formation of main varieties of porous structures, such as weakly coupled micro-and nanocrystals, and three-dimensional labyrinth structures, are found using scanning electron microscopy. It is established that the main prerequisites for the formation of pores are the stationarity of the process and proximity to the phase equilibrium in the plasma-Condensate System.

Dmitrii O. Kharchenko - One of the best experts on this subject based on the ideXlab platform.

  • Nano-sized Adsorbate Island Formation in Adsorptive Anisotropic Multilayer Systems
    Springer Proceedings in Physics, 2019
    Co-Authors: Vasyl O. Kharchenko, Alina V. Dvornichenko, Dmitrii O. Kharchenko
    Abstract:

    We derive the generalized model of multilayer adsorptive System describing pattern formation on a surface of thin films during adsorption/desorption processes at condensation from gaseous phase and in plasma-Condensate Systems by taking into account transference reactions between layers. We discuss isotropic and anisotropic diffusion of adsorbate between layers, separately, in the framework of theoretical study and numerical simulations. It is shown that in multilayer adsorptive System, a cascade of first-order phase transitions is realized, and the number of such phase transitions is defined by the number of layers. We show that in the isotropic case of the standard vertical diffusion, an increase in the adsorption coefficient leads to a change in the surface morphology. In anisotropic gas-Condensate System with preferential motion of adatoms from upper layers to lower ones, we define conditions for the adsorbate island formation. We discuss an influence of the anisotropy strength onto critical size of adsorbate islands and perform statistical analysis of the multilayer surface structures. By considering plasma-Condensate Systems, we show that an increase in the anisotropy strength leads to both the transformation of the surface morphology from separated nano-holes inside adsorbate matrix toward separated adsorbate islands and decrease in the linear size of adsorbate islands.

  • Islands growth control in adsorptive multilayer plasma-Condensate Systems
    Journal of Crystal Growth, 2019
    Co-Authors: Alina V. Dvornichenko, Dmitrii O. Kharchenko, Iryna O. Lysenko, Vasyl O. Kharchenko
    Abstract:

    Abstract A model for adsorbate islands growth is proposed to simulate pattern formation in multilayer plasma-Condensate System. It was shown that morphology of surface patterns and mean island size can be effectively controlled by adsorption rate (pressure of gaseous atmosphere), interaction strength of adsorbate and external electrical field, managing anisotropic diffusion of atoms between layers. Dynamics of patterns formation is analyzed by considering statistical properties of growing surface on each formed layer and mean island size having size from third up to two diffusion lengths of adatoms. It was shown that island growth relates to modified Ostawald ripening scenario with universal island size distribution. Obtained data relates well to experimental observation of adsorbate island formation at condensation of metals and semiconductors. Described model and results are general and can be used to describe real experimental observations of surface nanopatterning at condensation in plasma-Condensate devices.

  • Nano-sized Adsorbate Structure Formation in Anisotropic Multilayer System
    Nanoscale Research Letters, 2017
    Co-Authors: Vasyl O. Kharchenko, Dmitrii O. Kharchenko, Vladimir Yanovsky
    Abstract:

    In this article, we study dynamics of adsorbate island formation in a model plasma-Condensate System numerically. We derive the generalized reaction-diffusion model for adsorptive multilayer System by taking into account anisotropy in transfer of adatoms between neighbor layers induced by electric field. It will be found that with an increase in the electric field strength, a structural transformation from nano-holes inside adsorbate matrix toward separated nano-sized adsorbate islands on a substrate is realized. Dynamics of adsorbate island sizes and corresponding distributions are analyzed in detail. This study provides an insight into details of self-organization of adatoms into nano-sized adsorbate islands in anisotropic multilayer plasma-Condensate Systems.

V. I. Perekrestov - One of the best experts on this subject based on the ideXlab platform.

  • Self-organization of plasma-Condensate quasi-equilibrium Systems
    Physics of the Solid State, 2009
    Co-Authors: V. I. Perekrestov, A. S. Kornyushchenko, A. I. Olemskoĭ, Yu. A. Kosminskaya
    Abstract:

    The steady-state regime of condensation under conditions close to the phase equilibrium is shown to be provided by the self-organization of the plasma-Condensate System. This self-organization is associated with the fact that the presence of the plasma leads to a considerable increase in the energy of adatoms and, hence, in the temperature of the growth surface in the course of their condensation. The increase in the temperature is compensated by the desorption flow of adatoms responsible for the supersaturation. It is demonstrated that the proximity of the System to the phase equilibrium ensures the selective regime of condensation during which the adatoms are attached onto active centers of the growth surface, thus forming various three-dimensional structures.

  • Selective processes that proceed during formation of aluminum layers near the phase equilibrium in a plasma-Condensate System
    Technical Physics, 2008
    Co-Authors: V. I. Perekrestov, A. S. Kornyushchenko, Yu. A. Kosminskaya
    Abstract:

    The mechanisms of pore formation in aluminum Condensates produced using a radically new technological approach that is based on self-organized sputtering Systems are studied. The main technological parameters of pore formation are found to be determined by the closeness to the phase equilibrium in the plasma-Condensate System and by the predominant contribution of structural or field selectivity to atom-by-atom assembling of the Condensate.

  • Regularities of Al layer structure formation near phase equilibrium in plasma-Condensate System
    Physics of the Solid State, 2008
    Co-Authors: V. I. Perekrestov, A. S. Kornyushchenko, Yu. A. Kosminskaya
    Abstract:

    A fundamentally new technological approach to creating porous metal structures on isotropic substrates during condensation of a reverse diffusion flow in a planar dc magnetron is proposed. The physical foundations of the operation of self-organized sputtering Systems are analyzed. Conditions of the formation of main varieties of porous structures, such as weakly coupled micro-and nanocrystals, and three-dimensional labyrinth structures, are found using scanning electron microscopy. It is established that the main prerequisites for the formation of pores are the stationarity of the process and proximity to the phase equilibrium in the plasma-Condensate System.