Digest Journal of Nanomaterials and Biostructures,
Journal Year:
2023,
Volume and Issue:
18(3), P. 1051 - 1063
Published: Sept. 20, 2023
In
this
research,
various
concentrations
of
manganese
dioxide
(MnO2)
is
composed
by
polyvinyl
alcohol
(PVA)
to
forming
PVA
/MnO2
films.
The
XRD
and
SEM
are
respectively
demonstrated
the
structure
morphological
characteristics
results
show
that
PVA/MnO2
films
fabricated
successfully.
demonstrate
MnO2
dispersed
evenly
along
polymeric
chains.
conductivity,
impedance
energy
density
were
measured
via
an
LCR
bridge
with
frequency
102
106
Hz.
There
increase
in
dielectric
from
64
for
95
PVA/0.06MnO2
at
105
Hz,
also
conductivity
increases
3.61x10-3
S/cm
5.33x10-3
PVA/0.06MnO2.
optical
recorded
UV/Vis
spectroscopy.
band
gap
reduced
5.01
eV
4.85,
4.71,
4.59
PVA/0.02MnO2,
PVA/0.04MnO2,
And
Urbach
tail
modified
1.72
3.12,
3.453,
3.66
respectively.
present
work
open
possibility
applied
different
devices
as
storage
systems
optoelectronics.
Polymers,
Journal Year:
2023,
Volume and Issue:
15(10), P. 2391 - 2391
Published: May 20, 2023
The
solution
casting
technique
is
utilized
to
fabricate
blank
and
CuO-doped
polyvinyl
alcohol/chitosan
(PVA/CS)
blends
for
eco-friendly
applications.
structure
surface
morphologies
of
prepared
samples
were
explored
by
Fourier
transform
infrared
(FT-IR)
spectrophotometry
scanning
electron
microscopy
(SEM),
respectively.
FT-IR
analysis
reveals
the
incorporation
CuO
particles
within
PVA/CS
structure.
SEM
exposes
well-dispersion
in
host
medium.
linear/nonlinear
optical
characteristics
found
on
basis
UV-visible-NIR
measurements.
transmittance
decreases
upon
increasing
20.0
wt%.
bandgap
(Eg
dir./Eg
ind.)
from
5.38/4.67
eV
(blank
PVA/CS)
3.72/3.12
(20.0
wt%
CuO-PVA/CS).
An
obvious
improvement
constants
blend
achieved
doping.
Wemple-DiDomenico
(WDD)
Sellmeier
oscillator
models
examine
role
dispersion
behavior
blend.
shows
clear
enrichment
parameters
host.
novel
findings
current
study
nominate
films
applications
devices.
Journal of Materials Science Materials in Electronics,
Journal Year:
2023,
Volume and Issue:
34(5)
Published: Feb. 1, 2023
Abstract
Gold
nanoparticles
(AuNPs)
were
synthesized
via
laser
ablation
technique.
PEO/CMC-AuNPs
nanocomposites
prepared
using
the
casting
method.
Water
was
chosen
as
a
solvent
because
it
considered
an
eco-friendly
compared
to
other
organic
solvents.
SEM
micrographs
reveal
uniformly
distributed
AuNPs
on
sample
surface.
3D
images
used
estimate
roughness
parameters.
The
$${\varepsilon
}^{{\prime}}$$
ε′
and
}^{{\prime\prime}
}$$
″
values
decrease
at
high
frequencies
due
short
time
allotted
for
dipole
aligning.
behavior
of
tan
$$\delta$$
δ
attributed
more
dipoles
that
cannot
follow
oscillating
electric
field.
M′
approach
zero
low
insignificant
effect
electrode
polarization.
presence
semicircles
below
real
axis
implies
dispersion
in
relaxation
time,
indicating
dielectric
process
follows
non-Debye
model.
two
regions'
curves
imply
samples
contain
electrical
conduction
mechanism
hopping
type.
conductivity
increased
with
increase
transition
probability
electrons.
From
obtained
results,
can
be
superior
others
different
biological
applications.
