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

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 sputtering method. High purity argon (Ar) and methane (CH4) gases mixture and combined t...

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Published inPhysical Sciences and Technology Vol. 3; no. 2
Main Authors Ye.S. Mukhametkarimov, S.L. Mikhailova, K. Dautkhan, A. Bashen, Zh.N. Zhumatayev, O.V. Rofman, S.Ya. Maksimova, O.Yu. Prikhodko
Format Journal Article
LanguageEnglish
Published Al-Farabi Kazakh National University 01.05.2018
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Summary: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 sputtering method. High purity argon (Ar) and methane (CH4) gases mixture and combined target of polycrystalline graphite 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 obtain concentration dependence of electrical conductivity. Conductivity of a-C:H<Ag+Ti> films was described theoretically 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 at the 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 percolation theory and by effective medium model as well.
ISSN:2409-6121