Studying Loading-Temperature Effects in Electric Conductivity of Graphene-Epoxy Nanocomposites

Multilayered graphene nanoplatelets (MLGs) have been prepared by using the electrochemical technique, starting from thermally-expanded-graphite flakes. Structural properties of MLGs have been tested by SEM, X-ray diffraction, and nitrogen absorption technique. Electrical conductivity (\sigma=\vareps...

Full description

Saved in:
Bibliographic Details
Main Authors: Gorb, Alla, Korotchenkov, Oleg, Gorelov, Borys, Wacke, Sylwester, Czapla, Zbigniew, Polovina, Oleksiy, Shulga, Sergey, Nadtochiy, Andriy
Format: Conference Proceeding
Language:English
Subjects:
charge transport
Conductivity
DGEBA-epoxy resin
dielectric permittivity
electrical conductivity
Graphene
Loading
multilayered graphene nanoplatelets
nanocomposite
Nanocomposites
Scanning electron microscopy
Temperature distribution
Temperature measurement
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Multilayered graphene nanoplatelets (MLGs) have been prepared by using the electrochemical technique, starting from thermally-expanded-graphite flakes. Structural properties of MLGs have been tested by SEM, X-ray diffraction, and nitrogen absorption technique. Electrical conductivity (\sigma=\varepsilon_{0}\ \varepsilon_{2}\ \omega) of MLG nanocomposites based on a DGEBA-epoxy resin have been determined by measuring complex dielectric permittivity (\varepsilon/\varepsilon_{0}=\varepsilon_{1}+j\ \varepsilon_{2}) within the frequency (\omega/2\pi) range of 4-100 Hz, temperature (T) range of 90-350 \mathrm{K} for mass loadings (\varphi_{m}) varied from 0 to 5%. The later correspond to volume loadings (\varphi_{v}) of 0-2.7 %. The dependences of \sigma versus \omega, T , and \varphi_{v} and possible mechanisms of composite's conductivity have been discussed and a phenomenological model to describe charge transport on graphene-epoxy interfaces has been proposed.
ISSN:2693-3535
DOI:10.1109/ELNANO54667.2022.9927046