Formation of Nanosize Structures of Adsorbate in Processes of Condensation of a Gas Phase with Due Regard for Temperature Effects
V. O. Kharchenko$^{1}$, V. V. Yanovsky$^{2}$, A. V. Dvornichenko$^{3}$
$^{1}$Institute of Applied Physics, NAS of Ukraine, 58 Petropavlivska Str., 40000 Sumy, Ukraine
$^{2}$Institute for Single Crystals, NAS of Ukraine, 60 Nauky Ave., 61178 Kharkiv, Ukraine
$^{3}$Sumy State University, 2 Rymskogo-Korsakova Str., 40000 Sumy, Ukraine
Received: 20.10.2015. Download: PDF
An influence of thermal conductivity of a surface on adsorbate-islands’ formation at vapour deposition in the reaction—diffusion systems is studied. Non-equilibrium chemical reactions, which are responsible for stable-dimmers’ formation, are taken into account with assumption that the surface temperature can be changed locally due to adsorption/desorption processes. For homogeneous system, the conditions for first-order phase transitions of the gas—solid type are found. Within the framework of the linear stability analysis, the phase diagram illustrating a region with spatial instabilities is calculated. The numerical simulations show that thermal conductivity governs transient dynamics of adsorbate-structures’ formation. The mean size of adsorbate islands evolves in time according to power law, and the growth power exponentially increases with thermal conductivity. The distributions of adsorbate islands over sizes are calculated in stationary limit, and it is found that an increase in thermal conductivity of the surface leads to transformation of distribution from Lognormal form to Gaussian one. As shown, the mean size of stationary adsorbate islands is characterized by nanometre scale.
Key words: vapour deposition, nanosize adsorbate structures, reaction-diffusion systems, thermal effects.
URL: http://mfint.imp.kiev.ua/en/abstract/v38/i02/0205.html
DOI: https://doi.org/10.15407/mfint.38.02.0205
PACS: 05.40.-a, 65.80.-g, 68.43.-h, 81.16.Rf, 82.40.Ck, 82.40.Np, 89.75.Kd
Citation: V. O. Kharchenko, V. V. Yanovsky, and A. V. Dvornichenko, Formation of Nanosize Structures of Adsorbate in Processes of Condensation of a Gas Phase with Due Regard for Temperature Effects, Metallofiz. Noveishie Tekhnol., 38, No. 2: 205—227 (2016) (in Ukrainian)