Modelling the Initial Stages of Condensation of As-S Atomic Clusters

Authors А.V. Dalekorej1, V.S. Kovtunenko2, М.V. Stoika3

1Department of Computer Systems and Networks, Faculty of Engineering, Uzhhorod National University, 3, Narodna Sq., 88000 Uzhhorod, Ukraine

2Department of Higher Mathematics, Cherkasy State Technological University, 460, Shevchenko Blv., 18006 Cherkasy, Ukraine

3Department of Mathematics and Informatics, Ferenc Rakoczi II. Transcarpathian Hungarian Institute, 6, Kossuth Sq., 90200 Beregszasz, Ukraine

Issue Volume 10, Year 2018, Number 3
Dates Received 27 January 2018; revised manuscript received 06 June 2018; published online 25 June 2018
Citation А.V. Dalekorej, V.S. Kovtunenko, М.V. Stoika, J. Nano- Electron. Phys. 10 No 3, 03012 (2018)
PACS Number(s) 78.90. + t
Keywords Adsorption (9) , Chalcogenide clusters, First-principle modelling.

With the use of first-principle quantum-mechanical method DFT the initial phases of condensation processes of 4- and 5-atomic AsnSm clusters on the carbon substrate have been studied. It has been determined that due to the break of one or two chemical bonds most clusters during adsorption on the surface of the carbon substrate are transformed from their initial structural shapes into the chain whose ends are covalently bonded with the substrate. The calculated adsorption energies of such clusters on the carbon substrate are equal to 1.7-1.9 eV/atom. Pentagon-shaped S5, As2S3 and As4S clusters are also highly likely to be adsorbed on the carbon substrate without the change of their spatial shape under the influence of van der Waals forces. For As4 clusters-molecules such adsorption mechanism is the main one. The energy of such adsorption of clusters is 0.4-0.5 eV/atom. It has been determined that the energy and mechanism of adsorption of AsnSm clusters are significantly affected by the dynamics of changes in internal tensions of the atomic system before and after adsorption. Such effect may be more significant in case of adsorption not on the model, but on real, more “rigid” carbon substrates.

List of References