[en] Theoretical investigations of the electronic structure, synthesis, and all-optical magnetization switching of transition-metal silicide nanostructures are reported. The magnetic moment of the nanostructures is studied as a function of the silicide cluster size and configuration. The experimentally demonstrated magnetization switching of nanostructured nickel silicide by circularly polarized light makes it possible to create high-speed storage devices with high density data recording

[en] A new approach to simulating the morphology of hierarchical nanocrystals has been proposed on the example of ZnO nanotetrapods. Within this approach, twinning is considered as a point of symmetric growth bifurcation under unstable conditions. The electronic structure has been calculated for elementary ZnO clusters of different symmetries by the molecular dynamics method to reveal the processes of symmetry transformations occurring under nonequilibrium conditions during the forming of the tetrapod nucleus.

[en] Results of the numerical simulation of the electronic structure of ultra-short single-walled carbon nanotubes (0, 9) of D_3_h, D_3_d and D_3 symmetries at the singlet and triplet spin states were presented. The dependencies of the energy gap, ionization potential, electron affinity and work function on the length of nanotubes at the singlet and triplet spin states were obtained. The analysis of the dimensionally dependent change of the electron density of states and energy gap for electrons with spin up and down allowed to establish the dependence of the spin polarization value on the length and symmetry of nanotubes. It was revealed that the energy required to turn from singlet to triplet is in the IR range that makes ultra-short single-walled carbon nanotubes (0, 9) a promising material for the design of the element base for spintronics and optoelectronics. (paper)

[en] Paper studies conditions for the formation of 2D allotropes of layered precursors (antimony, graphite) and self-assembled composite structures based on them. The latter assemble from colloidal solution of the inter-layers. The above conditions have been studied both experimentally and theoretically within the framework of our research. The modes for the isopropanol/antimony self-activated colloidal solutions have been set up. These processes are accompanied by the long-term nonlinear hydrodynamic effects in a colloidal solution that correlate with periodic changes of solution particle sizes. It has been proved theoretically that the charge properties of multilayers of antimony are different, whereas the processes observed during the tests indicate the presence of 2D structures within different number of layers of the solution volume, ranging in type and magnitude of the charge. Two types of composite structures have been obtained: a multilayer multigraphene/antimony structure and a polymorphic multigraphene/nanofiber. (paper)

[en] Results of the numerical simulation of an electronic structure of an ultrashort singlewalled carbon nanotube (5, 5) at singlet and triplet states were presented. An antiphase energy gap oscillation on the length of the ultrashort nanotube (5, 5) at singlet and triplet states was revealed. It was found that the ground state of the nanotube is singlet, herewith the energy of the singlet-triplet transition corresponds to the energy value of visible and IR-radiation. (paper)

[en] The paper describes results of a theoretical study of the electronic structure of the capped finite-length single-walled carbon nanotube (5, 5) under an applied electric field in the range from 0 to 0.5 V/Å. Clear oscillations of an ionization potential, electron affinity, gap energy and an effective work function on the length of the nanotube are presented. An applied electric field leads to the energy gap decrease and the work function increase. An estimation of the electron emission current density changes is revealed taking into account the work function dependence both on the nanotube length and the strength of the electric field

[en] Experimental and theoretical approaches were used for the investigation of mechanisms and conditions of self-organized nanostructures formation in the drying drop of the mixture of colloidal suspensions of nanoscale amorphous silicon dioxide and carbon nanotubes. The formation of rodlike structures with diameter 250-300nm and length ∼4pm was revealed. The diffraction analysis of the obtained nanostructures showed the formation of the silicon carbide phase at room temperature. (paper)

[en] In this paper, low-dimensional silicon carbide (SiC) obtained on the basis of SiC monolayers with a stoichiometric composition of 1:1 and a number of layers from 1 to 3 has been studied based on the quantum-chemical analysis of the structure and charge properties of this material. The redistribution of the electron density registered in a stack of graphene-like SiC layers allowed us to propose a method of identification of low-dimensional silicon carbide structures. The analysis of geometric and energy parameters made it possible to suggest the sustainable existence of two structural types of 2D-SiC, which differ in the way they are positioned within the layers. As a result of the analysis of the effective charge magnitude, the correlation between this parameter and the geometry of the optimized structure was established. It is proved that taking into account the charge properties of low-dimensional silicon carbide makes it possible to trace the structural changes in the system, identify a specific allotrope, and establish the order of the monolayers. (paper)