Advanced Materials Technologies,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 13, 2024
Abstract
Poly(vinylidene
fluoride)
(PVDF)
demonstrates
great
potential
for
applications
in
flexible
sensing
and
energy
harvesting
but
the
piezoelectric
coefficient
is
less
than
30
pm
V
−1
even
with
full
beta
phase.
Herein,
an
all‐organic
composite
of
PVDF
ionic
liquid
(IL)
manufactured
through
stretching,
constrained
annealing,
polarization.
The
DFT
XPS
indicate
strong
dipole
interactions
between
IL,
favoring
orientation
crystallization
PVDF.
Surprisingly,
nanobound
states
ions
achieve
different
physical
fields,
providing
enhances
piezoelectricity
films,
confirmed
by
variable
temperature
dielectric
properties,
FTIR
XRD.
An
inverse
51.8
,
obtained
from
containing
0.75
wt.%
improved
116%
compared
to
commercial
(≈24
).
This
work
presents
a
novel
strategy
fabrication
high
polymers.
Materials,
Journal Year:
2025,
Volume and Issue:
18(3), P. 615 - 615
Published: Jan. 29, 2025
With
the
advent
of
intelligent
era,
flexible
piezoelectric
tactile
sensors,
as
key
components
for
sensing
information
and
transmitting
signals,
have
received
worldwide
attention.
However,
pressure
sensors
are
still
currently
limited,
which
severely
restricts
their
practical
applications.
Furthermore,
demonstrations
conducted
in
labs
not
accurate
to
real-world
scenarios.
Thus,
there
is
an
urgent
need
further
optimize
intrinsic
performance
usage
characteristics
meet
application
requirements.
As
a
representative
piezoelectric,
polyvinylidene
fluoride
(PVDF)
exhibits
significant
advantages
terms
excellent
flexibility,
chemical
stability,
high
electromechanical
conversion,
low
cost,
appropriate
acoustic
impedance,
allow
it
serve
core
matrix
sensors.
This
paper
aims
summarize
very
recent
progress
based
on
PVDF,
including
composition
modulation,
structure
optimization,
Based
comprehensive
summary
studies,
we
propose
rational
perspectives
strategies
regarding
PVDF-based
provide
some
new
insights
research
industrial
communities.
Advanced Sustainable Systems,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 23, 2024
Abstract
Harvesting
magnetic
noise
fields
around
power
cables
emerges
as
an
attractive
approach
due
to
its
potential
a
renewable
and
ubiquitous
energy
source
for
powering
wireless
sensor
networks
(WSNs)
in
IoT
applications,
miniature
electronics,
implantable
medical
devices.
Flexible
polymer‐based
magneto‐mechano‐electric
(MME)
generators
gain
attention
their
effectiveness
harvesting
owing
durability
flexibility.
In
this
study,
lead‐free,
flexible
MME
generator
is
developed
by
using
Polyvinylidene
fluoride
(PVDF)‐Aluminium
nitride
(AlN)‐nanofiber
composites
fabricated
via
electrospinning
with
different
AlN
compositions
integrated
magnetostrictive
Metglas
layer
that
offers
self‐bias
characteristics.
The
modeled
COMSOL
Multiphysics
analyze
the
flux
density
distribution
over
surface
piezoelectric
effect
of
nanofiber
composites,
simulation
results
aligning
well
experimental
data.
optimized,
generator,
incorporating
15
wt.%
PVDF/Metglas
composite,
achieves
open‐circuit
voltage
18.5
V
0.93
mW‐cm
−3
when
exposed
Alternating
Current
(AC)
field
6
Oe
at
resonance
frequency
50
Hz.
generated
sufficient
operate
LEDs
sensor.
This
newly
shows
significant
promise
advanced
applications
self‐powered
WSNs.
Lead-free
halide
perovskite
(LFHP)
materials
have
recently
received
a
lot
of
attention
in
optoelectronic
applications
due
to
their
low
toxicity
and
outstanding
optical
characteristics.
Simultaneously,
the
increased
thrust
for
flexible,
wearable,
lightweight
devices
is
driving
improvements
sensor
actuator
technology.
In
this
context,
flexible
piezoelectric
polymer
composites
based
on
LFHPs
are
gaining
popularity
exceptional
piezoelectric,
pyroelectric,
ferroelectric,
traits.
Thus,
investigation
presents
long-term
stable
lead-free
rubidium
copper
chloride
(Rb2CuCl3)-based
poly(vinylidene
fluoride)
composites.
The
optimized
PVDF/Rb2CuCl3
composite
yields
∼92.4%
electroactive
phase
PVDF.
Interfacial
interactions
between
PVDF
Rb2CuCl3
played
pivotal
role
β-phase
transformation,
resulting
improved
stability.
A
nanogenerator
(PENG)
has
been
fabricated
employing
mechanical
energy
harvesting
biophysiological
motion
monitoring,
demonstrating
potential
healthcare
industry.
Piezoelectric
Energy
Harvester
(PEH)
with
PRCC_2.5
(PVDF
2.5
wt
%
Rb2CuCl3)
outperformed
other
composites,
maximum
open-circuit
voltage
(Voc)
∼51.7
V
short-circuit
current
(Isc)
∼4.6
μA.
pristine
PVDF-based
device
(PEH
0)
had
inferior
performance,
Voc
∼12
an
Isc
∼0.5
PEH
exhibited
charge
∼126
nC,
which
far
higher
than
0
corresponding
was
∼7
nC.
Furthermore,
during
periodic
application
force
∼5
N,
stability
durability
were
evaluated.
10,250
compression
cycles
used
measure
electrical
output
device.
Remarkably,
following
cycles,
there
no
discernible
drop
(∼16
V).
addition,
photodetector
developed
investigate
piezo-phototronic
effect,
displaying
quick
photoswitching
behavior
rise
decay
periods
∼3.22
∼5.48
s,
respectively.
These
findings
demonstrate
that
significant
as
signal-modulated
piezoresponsive
wearable
sensor.
ACS Applied Materials & Interfaces,
Journal Year:
2025,
Volume and Issue:
17(19), P. 28668 - 28681
Published: April 30, 2025
Piezoelectric
nanogenerators
(PENGs)
based
on
electrospun
membranes
hold
significant
promise
for
applications
in
wearable
electronics,
biomedicine,
and
multifunction
sensors.
The
evolution
of
composite
fiber
can
effectively
address
the
challenges
low
output
power
poor
stability
PENGs.
Herein,
a
structured
polyaniline-coated
halloysite
nanotube
(PANi@HNT)
was
synthesized
through
oxidative
polymerization.
These
nanomaterials
were
dispersed
within
poly(vinylidene
fluoride)
(PVDF)
due
to
high
conductivity
polyaniline
surface
charge
they
carry.
Consequently,
agglomeration
fibers
during
electrospinning
mitigated,
resulting
significantly
reduced
dielectric
loss
improved
piezoelectric
properties
membranes.
Notably,
PENGs
incorporating
15%
PANi@HNT
achieved
an
impressive
voltage
90
V
demonstrated
stable
performance
over
10,000
cycles,
with
peak
density
reaching
maximum
116.42
μW/cm2.
Such
show
human
movement
monitoring
as
well
energy
harvesting,
storage,
utilization.
Specifically,
generated
from
induce
regular
flickering
light
strip
consisting
0.2
W
beads
continuous
illumination
board
comprising
0.05
red
LEDs.
Moreover,
brief
PENG
is
capable
driving
electronic
watch.
