The percolation mechanism of conductivity in nanocomposite a-C:H<Ag+Ti> films

  • Ye.S. Mukhametkarimov
  • S.L. Mikhailova
  • K. Dautkhan
  • A. Bashen
  • Zh.N. Zhumatayev
  • O.V. Rofman
  • S.Ya. Maksimova
  • O.Yu. Prikhodko

Abstract

The presented work is about percolation mechanism of electrical conductivity of composite a-C:H<Ag+Ti>films. The a-C:H<Ag+Ti> thin films were deposited onto quartz substrates by ion-plasma magnetron sputteringmethod. High purity argon (Ar) and methane (CH4) gases mixture and combined target of polycrystallinegraphite with the purity of 99.99%, silver (99.99%) and titanium (99.99%) were used to produce а-С:Н<Ag+Ti> films. Resistance of the produced films has been measured using «two probe» method to obtainconcentration dependence of electrical conductivity. Conductivity of a-C:H<Ag+Ti> films was describedtheoretically in two ways: using the classical theory of percolation and a general effective medium (GEM)theory. Staircase percolation can be seen from the experimental results. The first percolation threshold occurs atthe concentration xc = 0.015 and the second one - at xc = 0.07. This could take place due to the fact that a-C:H<Ag+Ti> composite material consist of two different inclusions, silver and titanium dioxide nanoparticles.The percolation mechanism of a-C:H<Ag+Ti> film conductivity could be described by classical percolationtheory and by effective medium model as well.
Published
2018-05-03
How to Cite
MUKHAMETKARIMOV, Ye.S. et al. The percolation mechanism of conductivity in nanocomposite a-C:H films. Physical Sciences and Technology, [S.l.], v. 3, n. 2, p. 76-80, may 2018. ISSN 2409-6121. Available at: <http://phst.kaznu.kz/index.php/journal/article/view/109>. Date accessed: 24 oct. 2018. doi: https://doi.org/10.26577/phst-2016-2-109.
Section
Nanomaterials and Nanotechnology