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Critical
Behavior of
Electrical
Conductivity for
Reduced Graphene
Oxide/Epoxy
Resin Composites
Y. Niouaa,
S. El Bouazzaouia,
B. M. G. Melob,
P. R. Prezasb,
M. E. Achoura*,
M. P. F. Graçab,
L. C. Costab,
A. Fattoumc
and M. E.
Touhamid
aLaboratory
of Materials
Physics and
Subatomic,
Faculty,
University Ibn
Tofail, BP 242,
14000, Kenitra,
Morocco.
E-mail:
achour.me@univ-ibntofail.ac.ma
b
I3N and Physics
Department,
University of
Aveiro, 3810-193
Aveiro,
Portugal.
c
Research Unit of
Materials,
Environment and
Energy, Sciences
Faculty of Gafsa,
2112 Gafsa,
Tunisia.
d
Laboratoire
d'Ingénierie des
Matériaux et
d'Environnement:
Modélisation et
Application,
Sciences Faculty,
University Ibn
Tofail, BP 133,
14000, Kenitra,
Morocco.
Doi :
https://doi.org/10.47011/13.3.1
Cited by :
Jordan J. Phys.,
13 (3) (2020)
181-190
PDF
Received on:
08/08/2019;
Accepted
on:
5/12/2019
Abstract:
In this
paper,
we
analyze
the dc
and ac
electrical
conductivities,
in the
240 to
400 K
temperature
range
and 102
to 106
Hz
frequency
range,
of a
percolating
system
synthesized
by
mixing
reduced
graphene
oxide (rGO)
particles
in
insulating
epoxy
resin
matrix,
diglycidyl
ether of
bisphenol
A (DGEBA).
We found
that the
dc
electrical
conductivity
of the
samples
is
strongly
related
to the
rGO
content,
indicating
a
percolating
behavior
with
percolation
threshold
 ≈
4 %. The
critical
behavior
of the
dc
electrical
conductivity
as a
function
of the
temperature
indicates
a strong
positive
temperature
coefficient
and a
negative
temperature
coefficient
of
resistivity
below
and
above
the
transition
temperature
Tg,
respectively.
Moreover,
the
results
showed
that the
dc
conductivity
obeys
the
Arrhenius
law and
the ac
electrical
conductivity
is both
frequency
and
temperature
dependent
and
follows
the
Jonscher’s
power
law.
Keywords:
Composites,
Dielectric
properties,
Fillers,
Glass
transition,
Graphene.
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