Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(26)
Published: Feb. 8, 2024
Abstract
Flexible
pressure
sensors
with
broad
linearity
range
and
excellent
sensor‐to‐sensor
uniformity
have
attracted
unprecedented
attention
in
the
electronic
skins,
human–machine
interfaces,
environmental
monitoring.
However,
challenges
including
poor
owing
to
randomness
of
used
nanomaterials
or
porous
structures
saturated
response
that
leads
a
restricted
because
structural
stiffening
been
yet
addressed.
Herein,
novel
dielectric
layer
based
on
beetle‐inspired
gradient
slant
(GSS)
is
proposed
endow
capacitive
extensive
uniformity.
The
compressibility
GSS
due
bending
deformation
pillars
significantly
enhances
sensor
sensitivity.
comes
from
compensation
contact
area
during
sequential
tall
low
electrodes.
high
ascribed
batch‐to‐batch
consistency
prepared
via
3D
printing‐based
fabrication
process.
Moreover,
GSS‐based
present
rapid
response/recovery,
detection
limit,
dynamic
response,
negligible
hysteresis,
outstanding
long‐term
stability.
Finally,
applicabilities
diverse
scenarios
external
stimuli
detection,
flexible
perception
array,
smart
insole
system
are
demonstrated.
Nature Communications,
Journal Year:
2022,
Volume and Issue:
13(1)
Published: March 10, 2022
Abstract
Electronic
skins
(e-skins)
are
devices
that
can
respond
to
mechanical
stimuli
and
enable
robots
perceive
their
surroundings.
A
great
challenge
for
existing
e-skins
is
they
may
easily
fail
under
extreme
conditions
due
multilayered
architecture
with
mismatch
weak
adhesion
between
the
interlayers.
Here
we
report
a
flexible
pressure
sensor
tough
interfaces
enabled
by
two
strategies:
quasi-homogeneous
composition
ensures
match
of
interlayers,
interlinked
microconed
interface
results
in
high
interfacial
toughness
390
J·m
−2
.
The
endows
exceptional
signal
stability
determined
performing
100,000
cycles
rubbing,
fixing
on
car
tread
driving
2.6
km
an
asphalt
road.
topological
interlinks
be
further
extended
soft
robot-sensor
integration,
enabling
seamless
robot
highly
stable
sensing
performance
during
manipulation
tasks
complicated
conditions.
Advanced Materials,
Journal Year:
2021,
Volume and Issue:
33(48)
Published: Sept. 27, 2021
Abstract
Past
research
aimed
at
increasing
the
sensitivity
of
capacitive
pressure
sensors
has
mostly
focused
on
developing
dielectric
layers
with
surface/porous
structures
or
higher
constants.
However,
such
strategies
have
only
been
effective
in
improving
sensitivities
low
ranges
(e.g.,
up
to
3
kPa).
To
overcome
this
well‐known
obstacle,
herein,
a
flexible
hybrid‐response
sensor
(HRPS)
composed
an
electrically
conductive
porous
nanocomposite
(PNC)
laminated
ultrathin
layer
is
devised.
Using
nickel
foam
template,
PNC
fabricated
carbon
nanotubes
(CNTs)‐doped
Ecoflex
be
86%
and
conductive.
The
exhibits
hybrid
piezoresistive
piezocapacitive
responses,
resulting
significantly
enhanced
(i.e.,
more
than
400%)
over
wide
ranges,
from
3.13
kPa
−1
within
0–1
0.43
30–50
kPa.
effect
responses
differentiated
porosity
high
constants
by
comparing
HRPS
its
purely
counterparts.
Fundamental
understanding
prediction
optimal
CNT
doping
are
achieved
through
simplified
analytical
models.
able
measure
pressures
as
subtle
temporal
arterial
pulse
large
footsteps.
Advanced Materials,
Journal Year:
2021,
Volume and Issue:
33(27)
Published: June 1, 2021
Abstract
The
trade‐off
between
sensitivity
and
linearity
is
critical
for
preserving
the
high
pressure‐resolution
over
a
broad
range
simplifying
signal
processing/conversion
of
flexible
tactile
sensors.
Conventional
dielectrics
suffer
from
difficulty
quantitatively
controlling
interacted
mechanical
dielectric
properties,
thus
causing
restricted
capacitive
Herein,
inspired
by
human
skin,
novel
hybrid
composed
low‐permittivity
(low‐
k
)
micro‐cilia
array,
high‐permittivity
(high‐
rough
surface,
micro‐dome
array
developed.
pressure‐induced
series‐parallel
conversion
low‐
high‐
components
enables
linear
effective
constant
controllable
initial/resultant
capacitance.
gradient
compressibility
behavior
elastic
modulus
with
pressures,
which
derives
capacitance
variation
determined
constant.
Therefore,
an
ultrawide
up
to
1000
kPa
0.314
–1
are
simultaneously
achieved
optimized
dielectric.
design
also
applicable
triboelectric
sensors,
realizes
similar
output
voltage
enhanced
sensitivity.
With
across
range,
potential
applications
such
as
healthcare
monitoring
in
diverse
scenarios
control
command
via
single
sensor
demonstrated.
Small,
Journal Year:
2020,
Volume and Issue:
16(44)
Published: Sept. 6, 2020
Abstract
Wearable
sensors
have
gained
much
attention
due
to
their
potential
in
personal
health
monitoring
a
timely,
cost‐effective,
easy‐operating,
and
noninvasive
way.
In
recent
studies,
nanomaterials
been
employed
wearable
improve
the
sensing
performance
view
of
excellent
properties.
Here,
focus
is
mainly
on
nanomaterial‐enabled
latest
advances
monitoring.
Different
kinds
used
sensors,
such
as
metal
nanoparticles,
carbon
nanomaterials,
metallic
hybrid
nanocomposites,
bio‐nanomaterials,
are
reviewed.
Then,
progress
nanomaterial‐based
monitoring,
including
detection
ions
molecules
body
fluids
exhaled
breath,
physiological
signals,
emotion
parameters,
discussed.
Furthermore,
future
challenges
opportunities
Small,
Journal Year:
2021,
Volume and Issue:
18(7)
Published: Nov. 25, 2021
Abstract
Multiresponsive
flexile
sensors
with
strain,
temperature,
humidity,
and
other
sensing
abilities
serving
as
real
electronic
skin
(e‐skin)
have
manifested
great
application
potential
in
flexible
electronics,
artificial
intelligence
(AI),
Internet
of
Things
(IoT).
Although
numerous
sole
function
already
been
reported
since
the
concept
e‐skin,
that
mimics
features
human
skin,
was
proposed
about
a
decade
ago,
ones
more
capacities
new
emergences
are
urgently
demanded.
However,
highly
integrated
sensitive
multiresponsive
functions
becoming
big
thrust
for
detection
body
motions,
physiological
signals
(e.g.,
blood
pressure,
electrocardiograms
(ECG),
electromyograms
(EMG),
sweat,
etc.)
environmental
stimuli
light,
magnetic
field,
volatile
organic
compounds
(VOCs)),
which
vital
to
real‐time
all‐round
health
monitoring
management.
Herein,
this
review
summarizes
design,
manufacturing,
presents
future
challenges
fabricating
these
next‐generation
e‐skin
wearable
electronics.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: June 1, 2023
Abstract
Despite
the
extensive
developments
of
flexible
capacitive
pressure
sensors,
it
is
still
elusive
to
simultaneously
achieve
excellent
linearity
over
a
broad
range,
high
sensitivity,
and
ultrahigh
resolution
under
large
preloads.
Here,
we
present
programmable
fabrication
method
for
microstructures
integrate
an
ultrathin
ionic
layer.
The
resulting
optimized
sensor
exhibits
sensitivity
33.7
kPa
−1
linear
range
1700
kPa,
detection
limit
0.36
Pa,
0.00725%
2000
kPa.
Taken
together
with
rapid
response/recovery
repeatability,
applied
subtle
pulse
detection,
interactive
robotic
hand,
ultrahigh-resolution
smart
weight
scale/chair.
proposed
approaches
design
toolkit
from
this
work
can
also
be
leveraged
easily
tune
performance
varying
target
applications
open
up
opportunities
create
other
iontronic
sensors.
ACS Nano,
Journal Year:
2022,
Volume and Issue:
16(3), P. 3442 - 3448
Published: March 9, 2022
Soft
pressure
sensors
are
critical
components
of
e-skins,
which
playing
an
increasingly
significant
role
in
two
burgeoning
fields:
soft
robotics
and
bioelectronics.
Capacitive
(CPS)
popular
given
their
mechanical
flexibility,
high
sensitivity,
signal
stability.
After
decades
rapid
development,
e-skins
based
on
CPS
able
to
achieve
human-skin-like
softness
sensitivity.
However,
there
remain
major
roadblocks
the
way
for
practical
application
CPS:
decay
sensitivity
with
increased
coupled
response
between
in-plane
stretch
out-of-plane
pressure.
In
addition
existing
strategies
building
porous
and/or
dielectric
constant
dielectrics,
any
other
promising
methods
overcome
those
bottlenecks?
Are
further
considerations
widespread
deployment
e-skins?
This
perspective
aims
shed
some
light
topics.
