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.
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
Journal of Taibah University for Science,
Journal Year:
2023,
Volume and Issue:
17(1)
Published: March 27, 2023
Undoped
and
doped
polyvinyl
pyrrolidone/
carboxymethyl
cellulose
(PVP/CMC:
50/50%)
blended
polymers
with
melanin
were
formed.
X-ray
diffraction
analysis
confirmed
the
amorphous
nature
of
all
blends.
Scanning
electron
microscopy
results
smooth
homogeneous
surface
undoped
PVP/CMC
blend
melanin.
The
optical
parameters
fluorescence
spectra
investigated
as
functions
content.
direct
band
gap
(Eg)
for
used
is
2.86
eV.
indirect
Eg
values
are
5.1
(4.9,
3.2)
eV,
respectively.
reduced
to
(4.5,
3.23)
(2.2,
1.33)
eV
amount
became
3
wt
%
in
blend.
effect
doping
on
dielectric
constant,
loss,
AC
conductivity,
complex
impedance,
Nyquist
plot
electric
modulus
was
also
studied.
Arabian Journal of Chemistry,
Journal Year:
2023,
Volume and Issue:
16(10), P. 105171 - 105171
Published: July 20, 2023
Polymer-based
energy
storage
has
recently
attracted
the
attention
of
researchers.
Herein,
sol-gel
prepared
zinc
oxide
nanoparticles
(ZnO
NPs),
as
nanofiller
up
to
5
wt.%
filling
levels
and
a
host
polymeric
blend
matrix
polyvinyl
chloride
(PVC)
poly
(N-vinyl
carbazole)
(PVK)
were
taken
synthesize
nanocomposite
films
via
solution
casting.
The
ratio
PVC:
PVK
was
90:10
wt.%.
X-ray
diffraction
(XRD)
results
indicated
that
films'
crystallinity
decreased
ZnO
NPs
content
increased;
it
from
54.23
22.14
%.
scanning
electron
microscope
(SEM)
micrographs
revealed
good
miscibility
PVC/PVK
homogeneous
distribution
within
matrix.
thermal
stability
nanocomposites
studied
through
TGA
technique,
activation
calculated
using
Coats-Redfern
method.
In
optical
results,
absorption
spectra
gap
for
allowed
direct
transition
reduced
under
adding
NPs;
3.61
eV
pure
2.96
film
with
AC
conductivity
experiments
electrical/dielectric
properties
get
enhanced
by
increasing
content.
Following
incorporation
NPs,
electrical
(σac),
dc
(σdc),
dielectric
constant
(ε′),
loss
(ε′′)
values
PVC/PVK/ZnO
improved;
σdc
increased
6.46×10-16
S/cm
3.63×10-13
Additionally,
both
ε′
ε′′
while
These
findings
could
suggest
be
promise
applications
polymer-based
capacitors.
Journal of Materials Research and Technology,
Journal Year:
2023,
Volume and Issue:
24, P. 8241 - 8251
Published: May 1, 2023
Herein,
nanocomposite
polymer
electrolyte
films
were
prepared
from
the
blend
of
two
polymers,
polyethylene
oxide
(PEO)
and
carboxymethyl
cellulose
(CMC),
stuffed
with
various
contents
gold
quantum
dots
(AuQDs)
copper
nanoparticles
(CuNPs)
as
hybrid
nanofiller
via
solution
casting
method.
AuQDs
using
laser
ablation
in
liquid
(LAL).
TEM
images
showed
that
average
size
is
nearly
6.21
nm
a
spherical
shape.
The
effects
nano-filler
(AuQDs
CuNPs)
on
PEO/CMC
structural,
optical,
electrical/dielectric
characteristics
have
been
investigated
discussed.
XRD
results
revealed
crystallinity
degree
samples
decreased
increasing
AuQDs/CuNPs
content.
Also,
UV–Vis
spectroscopy
analysis
uncovered
optical
energy
gap
reduced
nanofillers'
content
increased.
At
room
temperature,
electrical
impedance
(EIS)
measurements
loading
increases
films'
conductivity.
In
dielectric
properties,
space
charges
polarization
higher
values,
where
constant
(ε′)
increased
at
lower
frequency
regions.
Nyquist
diagram
semicircular
shape
frequencies
part
linear
decreasing
radius;
equivalent
circuit
models
could
be
best
fit.
These
suggest
these
candidates
for
capacitors
flexible
storage
devices.
Results in Physics,
Journal Year:
2024,
Volume and Issue:
59, P. 107582 - 107582
Published: March 18, 2024
Polymer
nanocomposites
(PNCs)
composed
of
biopolymers
and
metallic
oxides
are
important
classes
materials.
In
addition
to
the
environmental
economic
considerations,
these
materials
became
best
candidates
for
various
industrial
fields.
current
study,
solution
cast
procedure
is
used
prepare
polymer
based
on
polyethylene
glycol
(PEG)/chitosan
(CS)
blend
varying
concentrations
tungsten
trioxide
nanoparticles
(WO3
NPs),
as
a
nanofiller.
TEM
micrograph
shows
that
WO3
NPs
have
particle
sizes
5–32
nm
their
shapes
cubic
spherical.
The
XRD
results
reveal
semicrystalline
PEG/CS
through
showing
three
distinct
diffraction
peaks
at
2θ
=
7.42°,
19.47°
23.62°
degree
crystallinity
decreased
after
incorporation
due
formation
polymer-nanoparticle
interactions
indicated
by
FTIR
spectra.
values
optical
energy
bandgap
(direct
indirect)
reduce
while
Urbach
increases
with
raising
concentration
in
matrix.
PEG/CS-WO3
films'
PL
spectra
show
photoemission
peak
about
387
nm,
where
this
loses
intensity
becomes
broader
induced
defects
increase
disordering
within
nanocomposite
films.
Additionally,
dielectric
investigation
an
constant,
loss,
AC
electrical
conductivity,
which
may
be
sign
charge
carriers
content
amorphous
regions
assists
movement
carriers.
DC
conductivity
conduction
mechanism
also
reported.
Argand
plot
half
semicircle
implying
Debye-type
relaxation
mechanism.
experimental
suggest
use
possible
contender
futuristic
storage
optoelectronic
applications.
