Hopping Conductivity and Dielectric Relaxations in Ag/PAN Nanocomposites

The dependence of the conductivity and electric modulus of silver/polyacrylonitrile nanocomposites on the frequency of an alternating electric field has been studied at different temperatures and starting mixture AgNO3 contents. The frequency dependences on the conductivity of the nanocomposites in...

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Bibliographic Details
Published in:Polymers 2021-09, Vol.13 (19), p.3251
Main Authors: Kudryashov, M.A., Logunov, A.A., Mochalov, L.A., Kudryashova, Yu.P., Trubyanov, M.M., Barykin, A.V., Vorotyntsev, I.V.
Format: Article
Language:English
Subjects:
Charge transport
Composite materials
Conductivity
Dielectric relaxation
Electric fields
Gold
Hopping conduction
Morphology
Nanocomposites
Nanoparticles
Particle size
Polyacrylonitrile
Polymerization
Polymers
Silver nitrate
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Summary:The dependence of the conductivity and electric modulus of silver/polyacrylonitrile nanocomposites on the frequency of an alternating electric field has been studied at different temperatures and starting mixture AgNO3 contents. The frequency dependences on the conductivity of the nanocomposites in the range of 103–106 Hz are in good agreement with the power law f0.8. The observed relaxation maxima in the relation of the imaginary part of the electric modulus on the frequency can be explained by interfacial polarization. It was shown that the frequency dispersions of conductivity and electric modulus were well described by the Dyre and Cole-Davidson models, respectively. Using these models, we have estimated the relaxation times and the activation energies of these structures. A mechanism of charge transport responsible for the conductivity of nanocomposites is proposed. An assumption is made regarding the presence of Ag42+ and Ag82+ silver clusters in the polymer.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym13193251