Temperature dependence of direct current conductivity in Ag-ED20 nanocomposite films


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Abstract

The effect of silver nanoparticles (NPs) in the concentration range of ≤0.8 wt % have on direct current conductivity σdc of Ag-ED20 nanocomposite is studied by method of broadband dielectric spectroscopy (10−2–105 Hz) method of broadband dielectric spectroscopy. It is found that temperature dependence σdc consists of two sections: above the glass transition temperature (Tg), the dependence corresponds to the empirical Vogel–Fulcher–Tammann law (Vogel temperature T0 does not depend on the NP concentration); below Tg, the dependence is Arrhenius with activation energy Ea ≈ 1.2 eV. In the region where T > Tg, the σdc value grows along with NP concentration. It is concluded that the observed broken form of the temperature dependence is apparently due to a change in the conduction mechanism after the freezing of ion mobility at temperatures below Tg.

About the authors

G. F. Novikov

Institute of Problems of Chemical Physics

Author for correspondence.
Email: ngf@icp.ac.ru
Russian Federation, Chernogolovka, Moscow oblast, 142432

E. V. Rabenok

Institute of Problems of Chemical Physics

Email: ngf@icp.ac.ru
Russian Federation, Chernogolovka, Moscow oblast, 142432

L. M. Bogdanova

Institute of Problems of Chemical Physics

Email: ngf@icp.ac.ru
Russian Federation, Chernogolovka, Moscow oblast, 142432

V. I. Irzhak

Institute of Problems of Chemical Physics

Email: ngf@icp.ac.ru
Russian Federation, Chernogolovka, Moscow oblast, 142432

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