Physica Scripta,
Journal Year:
2024,
Volume and Issue:
99(10), P. 1059c7 - 1059c7
Published: Sept. 27, 2024
Abstract
In
this
study,
ZnCo
2
O
4
/Graphene
quantum
dots
(ZCO/GQDs)
nanocomposite
was
fabricated
by
carbonization
and
hydrothermal
methods
in
four
volume
ratios
(40.0
ml/0.0,
37.5
ml/2.5
ml,
35.0
ml/5.0
32.5
ml
/7.5
ml)
of
ZCO/GQD
where
the
total
fixed
at
40
ml.
To
characterize
structural,
morphological,
optical
properties
nanocomposites,
x-ray
diffraction,
scanning
electron
microscopy,
energy
dispersive
x-ray,
UV-visible
spectrometry,
Z-scan
analysis
were
conducted.
The
variance
Williamson-Smallman
applied
to
calculate
microstructure
features.
results
illustrate
that
crystallite
size
strain
are
minimum
while
dislocation
density
has
a
maximum
value
for
ratio.
Band
gap
nonlinear
coefficients
obtained
Tauc
techniques
show
they
These
confirm
correlation
between
properties.
Such
can
be
improve
optoelectronic
applications
nanocomposite.
Physica Scripta,
Journal Year:
2024,
Volume and Issue:
99(10), P. 105991 - 105991
Published: Sept. 11, 2024
Abstract
Flexible
polymeric
film
composites
consisting
of
polyvinyl
alcohol
(PVA)
and
Sudan
IV
azo
dye
(Su-IV)
were
synthesized
using
a
casting
method.
Despite
the
known
optical
properties
PVA
dyes
individually,
combined
effects
Su-IV
doping
in
on
material’s
nonlinear
have
not
been
thoroughly
investigated.
This
study
addresses
this
gap
by
exploring
interactions
between
at
various
concentrations
(0.1–0.8
wt%)
their
subsequent
impact
structural
characteristics.
Fourier
transform
infrared
(FTIR)
spectroscopy
was
employed
to
identify
distinct
vibrational
groups
within
composites,
revealing
that
incorporation
induced
random
deviations
most
absorption
intensities
compared
pristine
PVA.
Notably,
new
peaks
519
444
cm
−1
emerged,
intensifying
with
increasing
concentrations,
indicating
significant
composite
constituents.
The
analyzed
through
transmittance
reflectance
measurements,
which
uncovered
518
357
nm
PVA/Su-IV
composites.
These
correspond
electronic
energy
transitions
2.4
3.6
eV,
respectively,
increased
higher
content.
Additionally,
indirect
direct
bandgaps
decreased
as
increased.
refractive
index
(n)
analysis
showed
typical
dispersion
behavior
850
2500
nm,
aligning
Wemple-DiDomenico
(WDD)
model.
Furthermore,
oscillator
parameters
calculated.
Also,
susceptibility
(χ
(3)
)
boosted
from
4.19
×
10
−6
for
pure
3.60
−4
sample
0.8
wt%
Su-IV.
(n
2
also
measured
8.55
−2
doped
sample.
findings
demonstrate
potential
applications
optics
photonics.
Journal of Applied Polymer Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 3, 2025
ABSTRACT
In
this
study,
ternary
blend
nanocomposites
were
synthesized
through
a
green
in
situ
polymerization
process,
utilizing
zinc
oxide
(ZnO)
nanofillers
into
polyvinyl
alcohol/cashew
gum/polypyrrole
(PVA/CG/PPy)
matrix.
The
optical,
morphological,
structural,
thermal,
mechanical,
and
electrical
properties
of
these
comprehensively
analyzed
using
UV–visible
spectroscopy,
FTIR,
XRD,
FE‐SEM,
TGA,
DSC.
findings
revealed
strong
interactions
between
PVA,
CG,
PPy,
ZnO,
with
the
uniform
growth
spherical
ZnO
nanoparticles
within
blend.
Increasing
content
led
to
reduction
optical
bandgap
energy,
reaching
3.375
eV
at
its
minimum.
XRD
an
intensified
signal
higher
concentrations.
Thermal
stability
(TGA)
glass
transition
temperature
(DSC)
improved
increasing
content,
signifying
interfacial
adhesion
PVA/CG/PPy
also
exhibited
enhanced
AC
conductivity
dielectric
compared
pristine
Notably,
constant,
loss,
impedance
decreased
rising
temperature.
Mechanical
39.6%
increase
tensile
strength
3
wt%
loading.
was
identified
as
optimal
nanofiller
wt%,
enhancing
properties,
making
promising
candidates
for
eco‐friendly,
robust,
efficient
nanoelectronic
devices.
ECS Journal of Solid State Science and Technology,
Journal Year:
2024,
Volume and Issue:
13(7), P. 073004 - 073004
Published: July 1, 2024
We
investigated
the
influence
of
CdS
on
structural
and
optical
properties
nano
ZnWO
4
for
applications.
(1−x)ZnWO
/xCdS
(x;
0
to
0.25)
heterojunctions
were
formed
structure
microstructure
phases
developed
using
Rietveld
refinement
analysis
synchrotron
X-ray
diffraction
data.
Phase
revealed
phase
percentage
is
always
less
than
nominated
value
(x),
implying
merging
some
Cd
S
into
ZnWO4.
Raman
spectra
showed
peaks,
confirming
existence
CdS.
Scanning
electron
microscopy
two
distinct
morphologies:
plate-like
particles
(ZnWO
phase)
spherical
shape
(CdS
phase).
UV–vis
diffuse
measurements
enhancement
absorbance
reduction
in
reflectance
transmittance,
range
300–56
nm,
as
amount
(x)
increased
system.
Band
gap
reduced
from
4.0
eV
x
=
0.0
3.9,
3.6,
2.9
0.05,
0.1,
0.25,
respectively.
The
highest
refractive
index
values
obtained
reached
0.05.
Impact
alloying
linear
nonlinear
parameters
emitted
photoluminescence
was
studied.
Upon
loading
with
CdS,
PL
intensity
greatly
quenched
whole
spectrum
red
shifted,
480
540
nm.
CIE
chromaticity
diagrams
show
that
sample
without
any
doping
exhibits
a
blue
color
while
doped
system
reveals
green-yellow
colors.
ECS Journal of Solid State Science and Technology,
Journal Year:
2024,
Volume and Issue:
13(10), P. 103009 - 103009
Published: Oct. 1, 2024
An
analysis
was
conducted
on
the
optical,
structural,
and
dielectric
characteristics
of
PVA/CMC/(1−x)ZnWO
4/x
PbS
blends.
The
structures
filler
samples,
undoped,
doped
blends
were
examined
using
X-ray
diffraction.
crystallite
sizes
various
phases
in
samples
are
affected
by
amount
nanocomposite.
morphologies
different
explored
scanning
electron
microscopy.
blend
exhibited
superior
absorption
Ultraviolet
A
(UVA)
B
(UVB)
types
addition
to
visible
spectrum.
optical
band
gaps
minimized
(5.37,
5.56,
4.11)
(4.76,
3.14,
2.92)
eV
for
direct
indirect
transitions,
respectively,
when
PVP/CMC
with
nanocomposite
had
10%
PbS.
highest
refractive
index,
constant,and
nonlinear
parameter
values
achieved
loaded
ZnWO4
only
while
conductivity
obtained
as
contained
15%
fluorescence
intensity
observed
fillers
did
not
contain
PbS,
it
decreased
concentration
increased.
