ACS Nano,
Journal Year:
2023,
Volume and Issue:
17(13), P. 12829 - 12841
Published: June 20, 2023
Chameleon
skin
is
naturally
adaptive
and
can
sense
environmental
changes
transform
sensing
into
bioelectrical
optical
signals
by
manipulating
ion
transduction
photonic
nanostructures.
The
increasing
interest
in
mimicking
biological
skins
has
considerably
promoted
the
development
of
advanced
materials
with
an
ionic
conductivity.
Herein,
we
report
judicious
design
fabrication
a
bioinspired
mechanochromic
chiral
nematic
nanostructured
film
good
conductivity
infiltrating
fluorine-rich
liquids
(FILs)
swollen
self-assembled
cellulose
nanocrystal
(CNC)
helical
nanoarchitectures.
Notably,
introduction
2-hydroxyethyl
acrylate
enhances
compatibility
hydrophobic
FILs
hydrophilic
CNCs.
resulting
FIL-CNC
films
exhibited
excellent
mechanochromism,
conductivity,
outstanding
optical/electrical
dual-signal
performance
when
used
as
for
real-time
monitoring
human
motions.
Owing
to
integration
FILs,
underwater
stability
liquid
crystal
nanostructures
CNCs
was
significantly
enhanced.
contact/contactless
modes
encrypted
information
transmission
have
been
achieved
film.
This
study
offer
great
insights
advancement
biomimetic
multifunctional
artificial
emerging
interactive
devices,
which
find
important
applications
wearable
iontronics,
human-machine
interactions,
intelligent
robots.
Chemical Society Reviews,
Journal Year:
2022,
Volume and Issue:
52(2), P. 473 - 509
Published: Dec. 9, 2022
Hydrogel-based
conductive
materials
for
smart
wearable
devices
have
attracted
increasing
attention
due
to
their
excellent
flexibility,
versatility,
and
outstanding
biocompatibility.
This
review
presents
the
recent
advances
in
multifunctional
hydrogels
electronic
devices.
First,
with
different
components
are
discussed,
including
pure
single
network
based
on
polymers,
additional
additives
(i.e.,
nanoparticles,
nanowires,
nanosheets),
double
additives.
Second,
a
variety
of
functionalities,
self-healing,
super
toughness,
self-growing,
adhesive,
anti-swelling,
antibacterial,
structural
color,
hydrophobic,
anti-freezing,
shape
memory
external
stimulus
responsiveness
introduced
detail.
Third,
applications
flexible
illustrated
strain
sensors,
supercapacitors,
touch
panels,
triboelectric
nanogenerator,
bioelectronic
devices,
robot).
Next,
current
challenges
facing
summarized.
Finally,
an
imaginative
but
reasonable
outlook
is
given,
which
aims
drive
further
development
future.
Advanced Functional Materials,
Journal Year:
2022,
Volume and Issue:
32(33)
Published: June 8, 2022
Abstract
Ionic
conductive
hydrogels
(ICHs)
integrate
the
performance
and
soft
nature
of
tissue‐like
materials
to
imitate
features
human
skin
with
mechanical
sensory
traits;
thus,
they
are
considered
promising
substitutes
for
conventional
rigid
metallic
conductors
when
fabricating
human‐motion
sensors.
However,
simultaneous
incorporation
excellent
stretchability,
toughness,
ionic
conductivity,
self‐healing,
adhesion
via
a
simple
method
remains
grand
challenge.
Herein,
novel
ICH
platform
is
proposed
by
designing
phenylboronic
acid‐ionic
liquid
(PBA‐IL)
multiple
roles
that
simultaneously
realize
highly
mechanical,
electrical,
versatile
properties.
This
elaborately
designed
semi‐interpenetrating
network
fabricated
facile
one‐step
approach
introducing
cellulose
nanofibrils
(CNFs)
into
PBA‐IL/acrylamide
cross‐linked
network.
Ingeniously,
dynamic
boronic
ester
bonds
physical
interactions
(hydrogen
electrostatic
interactions)
endow
these
remarkable
stretchability
(1810
±
38%),
toughness
(2.65
0.03
MJ
m
−3
),
self‐healing
property
(92
2%
efficiency),
adhesiveness,
transparency.
Moreover,
construction
this
material
shows
CNFs
can
synergistically
enhance
conductivity.
The
wide
working
strain
range
(≈1000%)
high
sensitivity
(GF
=
8.36)
make
candidate
constructing
next
generation
gel‐based
sensor
platforms.
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.
InfoMat,
Journal Year:
2023,
Volume and Issue:
5(4)
Published: Feb. 26, 2023
Abstract
The
human
skin,
an
important
sensory
organ,
responds
sensitively
to
external
stimuli
under
various
harsh
conditions.
However,
the
simultaneous
achievement
of
mechanical/thermal
sensitivity
and
extreme
environmental
tolerance
remains
enormous
challenge
for
skin‐like
hydrogel‐based
sensors.
In
this
study,
a
novel
skin‐inspired
hydrogel–elastomer
hybrid
with
sandwich
structure
strong
interfacial
bonding
mechanical–thermal
multimode
sensing
applications
is
developed.
An
inner‐layered
ionic
hydrogel
semi‐interpenetrating
network
prepared
using
sodium
carboxymethyl
cellulose
(CMC)
as
nanofiller,
lithium
chloride
(LiCl)
transport
conductor,
polyacrylamide
(PAM)
polymer
matrix.
outer‐layered
polydimethylsiloxane
(PDMS)
elastomers
fully
encapsulating
endow
hybrids
improved
mechanical
properties,
intrinsic
waterproofness,
long‐term
water
retention
(>98%).
silane
modification
hydrogels
imparts
enhanced
strength
integrity.
exhibit
high
transmittance
(~91.2%),
fatigue
resistance,
biocompatibility.
multifunctional
sensors
assembled
from
realize
real‐time
temperature
(temperature
coefficient
approximately
−1.1%
°C
−1
)
responsiveness,
wide‐range
strain
capability
(gauge
factor,
~3.8)
over
wide
range
(from
−20°C
60°C),
underwater
information
transmission.
Notably,
dual‐parameter
sensor
can
recognize
superimposed
signals
strain.
designed
prototype
arrays
detect
magnitude
spatial
distribution
forces
temperatures.
comprehensive
performance
via
facile
method
superior
that
most
similar
previously
reported.
Finally,
study
develops
new
material
platform
monitoring
health
in
environments.
image
Journal of Materials Chemistry A,
Journal Year:
2022,
Volume and Issue:
10(22), P. 11823 - 11853
Published: Jan. 1, 2022
This
review
summarizes
the
adhesion
mechanism
and
design
strategies
of
underwater
hydrogels,
generalizes
their
application
fields
(adhesives,
motion
monitoring,
marine
environmental
exploration
coatings).
Advanced Functional Materials,
Journal Year:
2022,
Volume and Issue:
32(25)
Published: March 19, 2022
Abstract
One
of
the
key
challenges
in
developing
gel‐based
electronics
is
to
achieve
a
robust
sensing
performance,
by
overcoming
intrinsic
weaknesses
such
as
unwanted
swelling
induced
deformation,
signal
distortion
caused
dehydration,
and
large
hysteresis
signal.
In
this
work,
structural
gel
composite
(SGC)
approach
presented
encapsulating
conductive
hydrogel/MXene
with
lipid
(Lipogel)
layer
through
an
situ
polymerization.
The
hydrophobic
Lipogel
coating
fulfills
SGC
unique
anti‐swelling
property
at
aqueous
environment
excellent
dehydration
feature
open‐air,
thus
leading
long‐term
ultra‐stability
(over
90
days)
durability
2000
testing
cycles)
for
underwater
mechanosensing
applications.
As
result,
based
mechanoreceptor
demonstrates
high
stable
sensitivity
(GF
14.5).
Moreover,
several
conceptual
sensors
are
developed
unveil
their
profound
potential
monitoring
human
motions,
waterproof
anti‐counterfeiting
application,
tactile
trajectory
tracking.
Advanced Functional Materials,
Journal Year:
2022,
Volume and Issue:
32(29)
Published: April 22, 2022
Abstract
Traditional
human
emotion
recognition
is
based
on
electroencephalogram
(EEG)
data
collection
technologies
which
rely
plenty
of
rigid
electrodes
and
lack
anti‐interference,
wearing
comfort,
portability.
Moreover,
a
significant
distribution
difference
in
EEG
also
results
low
classification
accuracy.
Here,
on‐skin
biosensors
with
adhesive
hydrophobic
bilayer
hydrogel
(AHBH)
as
interfaces
for
high
accuracy
are
proposed.
The
AHBH
achieves
remarkable
adhesion
(59.7
N
m
−1
)
by
combining
the
mechanism
catechol
groups
electrostatic
attraction.
Meanwhile,
synergistic
effects
group
rearrangements
surface
energy
reduction,
AHB‐hydrophobic
layer
exhibits
133.87°
water
contact
angles
through
treatment
only
0.5
h.
Hydrogen
bonds
introduced
to
form
seamless
adhesive‐hydrophobic
interface
inhibit
attenuation,
respectively.
With
an
ideal
device/skin
interface,
biosensor
can
reliably
collect
high‐quality
electrophysiological
signals
even
under
vibration,
sweating,
long‐lasting
monitoring
condition.
Furthermore,
electrodes,
processing,
wireless
modules
integrated
into
portable
headband
EEG‐based
classification.
A
domain
adaptive
neural
network
transfer
learning
technique
alleviate
effect
shift
achieve
