Heliyon,
Journal Year:
2024,
Volume and Issue:
10(4), P. e25429 - e25429
Published: Feb. 1, 2024
The
aim
of
this
study
was
to
investigate
the
effect
side
chain
size
on
optical
and
charge
transport
properties
thin
films
prepared
from
novel
conjugated
polysulfide-based
polymers.
Three
polymers,
labeled
P1,
P2,
P3,
were
derived
polysulfide
derivatives
had
different
arylene
groups
(5,5'-
biphenylene,
4,4'-biphenylene,
2,6-pyridylene).
Optical
analysis
performed
using
photoluminescence
(PL)
UV-visible
absorption
spectroscopy,
revealing
an
energy
band
gap
2.41-3.02
eV;
P1
emitted
yellow,
P2
blue-green,
P3
green.
Cyclic
voltammetry
measurements
electrochemical
HOMO
LUMO
levels
revealed
that
polymer
exhibited
p-type
semiconductor
activity;
electrical
diodes
based
ITO/polysulfide
derivative/Al
structure
explored
through
current-voltage
characteristics.
current
space
limitation
(SCLC)
mechanism
used
model
behavior
these
diodes;
film
layer
higher
mobility
than
other
layers.
relationship
between
geometry
their
thoroughly
investigated.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Aug. 15, 2024
This
study
investigates
the
development
of
novel
nanocomposite
films
based
on
a
blend
polyethylene
oxide
(PEO)
and
polyvinyl
alcohol
(PVA)
loaded
with
varying
weight
percentages
copper
cobaltite
nanoparticles
(CuCo2O4
NPs).
The
primary
objective
was
to
fabricate
these
nanocomposites
using
solution
casting
technique
explore
influence
CuCo2O4
content
their
structural,
optical,
electrical,
dielectric
properties.
Spinel-type
NPs
were
synthesized
via
hydrothermal
method
incorporated
into
PEO/PVA
blend.
X-ray
diffraction
(XRD)
analysis
revealed
transformation
polymer
matrix
towards
an
amorphous
state
increasing
content.
UV–Vis
spectroscopy
studies
demonstrated
decrease
in
both
direct
indirect
band
gaps
nanocomposites,
suggesting
potential
applications
optoelectronic
devices.
Impedance
measurements
significant
enhancement
ionic
conductivity
(three
orders
magnitude
higher
than
pristine
blend)
for
film
containing
1.8
wt%
CuCo2O4.
real
permittivity
(ε′)
imaginary
(ε″)
exhibited
frequency
due
interplay
various
polarization
mechanisms.
Notably,
incorporating
led
remarkable
improvement
energy
density
compared
Additionally,
barrier
observed.
These
findings
demonstrate
successful
fabrication
PEO/PVA-CuCo2O4
enhanced
observed
improvements
suggest
promising
materials
storage
devices
potentially
like
light-emitting
diodes.
Polymer Engineering and Science,
Journal Year:
2023,
Volume and Issue:
63(11), P. 3684 - 3697
Published: Aug. 28, 2023
Abstract
In
the
present
work,
sol–gel‐synthesized
titanium
oxide
nanoparticles
(TiO
2
NPs)
were
added
to
polyvinyl
chloride
(PVC)
and
polymethyl
methacrylate
(PMMA)
create
polymer
nanocomposites
(PNCs)
samples.
The
preparation
was
carried
out
via
solution
casting
method.
synthesized
TiO
NPs
have
a
tetragonal
anatase
phase
an
average
grain
size
of
15.7
nm.
XRD
analysis
reveals
that
NPs'
addition
PVC/PMMA
causes
decrease
in
crystallinity
PNCs
films.
Infrared
Fourier
demonstrated
interplay/complexity
between
blend
NPs.
UV/visible
spectrum
showed
two
absorbance
peaks
at
278
208
nm,
which
may
result
from
n
→
π*
π
transitions.
Also,
optical
bandgaps
for
indirect
direct
allowed
transitions
decreased
with
increasing
concentration.
samples'
AC
electrical
conductivity
dielectric
properties
measured
room
temperature.
As
content
nanocomposite
rises,
percolating
network
begins
emerge
inside
composite,
demonstrating
obeys
Jonscher's
law.
Additionally,
it
has
been
nanoparticle
concentration
leads
higher
composite
loss
constant.
These
findings
suggest
possibility
using
prepared
capacitive
energy
storage
optoelectronic
devices.
Highlights
PVC/PMMA‐TiO
nanocomposites'
films
fabricated
Adding
reduces
rising
content.
conductivity,
impedance,
characteristics
discussed.
indicate
use
samples
Physica Scripta,
Journal Year:
2023,
Volume and Issue:
98(11), P. 115964 - 115964
Published: Oct. 11, 2023
Abstract
Composite
films
made
of
polyvinyl
alcohol
(PVA)
filled
with
various
coronene
concentrations
were
fabricated
via
the
solution
casting
method.
Several
characterization
techniques
used
to
examine
prepared
samples.
The
x-ray
diffraction
study
shows
decreasing
semi-crystalline
properties
in
PVA/coronene
composites
increasing
levels,
thereby
improving
charge
carrier
mobility
and
enhancing
conductivity.
alterations
chemical
functional
groups
explored
using
Fourier-transform
infrared
spectroscopy
(FTIR).
impact
molecules
on
optical
characteristics
PVA
was
investigated
spectral
ranges
190-2500
nm.
composite
exhibits
higher
UV
blocking
190-400
nm
wavelength
range,
suitable
for
notch
filters
like
laser
filters.
By
filling
ratio
from
0
wt%
3
wt%,
both
indirect
direct
band-gap
decreased
5.19
eV
5.77
3.85
5.18
eV,
respectively.
single
oscillator
model
(Wemple-DiDomenico)
explain
refractive
index
dispersion
region.
extracted
values
energy
(E
d
),
o
dielectric
constant
at
infinite
frequency
(
ε
∞
lattice
L
)
samples
increased
0.78
2.41
1.32
1.41
13.44
12.22
2.10
2.13,
These
changes
parameters
are
due
cross-linking
between
polymeric
matrix
coronene.
As
a
result
these
improvements,
could
be
applied
flexible
packaging
applications
optoelectronic
devices
solar
cells
or
light-emitting
diodes.
