Advanced Functional Materials,
Journal Year:
2022,
Volume and Issue:
32(19)
Published: Feb. 5, 2022
Abstract
With
bio‐integrated
electronics
booming,
stretchable,
elastic,
compliance,
and
biocompatible
elastomers
attract
immense
research
interest
due
to
their
potential
integrate
with
electronic
devices
soft
tissues.
In
this
work,
a
double
network
skin‐like
elastomer
based
on
hydrophobic‐polyacrylamide/silk
fibroin
(HSF)
is
synthesized.
The
addition
of
the
in
polyacrylamide
hydrogel
significantly
improves
its
stretchability,
resilience,
tear
resistance.
Specifically,
HSF
demonstrates
tensile
strain
as
high
1000%
corresponding
stress
0.27
MPa
great
resilience
(550
cycles).
Based
such
HSF,
hybrid
mechanoreceptor
sensor
fabricated,
which
can
simultaneously
implement
slow
adaptive
fast
pulses
like
human
skin.
This
device
realizes
detection
variety
movements
joint
movement,
vocalization,
or
pulse
high‐frequency
vibration
signal
recognition,
applications
electronics.
Advanced Functional Materials,
Journal Year:
2021,
Volume and Issue:
31(24)
Published: April 8, 2021
Abstract
Conductive
hydrogels
(CHs)
have
been
highlighted
in
the
design
of
flexible
strain
sensors
and
stretchable
triboelectric
nanogenerators
(TENGs)
on
basis
their
excellent
physicochemical
properties
such
as
large
stretchability
high
conductivity.
Nevertheless,
incident
freezing
drying
behaviors
CHs
by
using
water
solvent
dispersion
medium
limit
application
scopes
significantly.
Herein,
an
environment
tolerant
ultrastretchable
organohydrogel
is
demonstrated
a
simple
solvent‐replacement
strategy,
which
partial
as‐synthesized
polyacrylamide/montmorillonite/carbon
nanotubes
hydrogel
replaced
with
glycerol,
leading
to
temperature
toleration
(−60
60
°C)
good
stability
(30
days
under
normal
environment)
without
sacrificing
The
exhibits
ultrawide
sensing
range
(0–4196%)
sensitivity
8.5,
enabling
effective
detection
discrimination
human
activities
that
are
gentle
or
drastic
various
conditions.
Furthermore,
assembled
single‐electrode
TENG,
displays
energy
harvesting
ability
even
500%
robustness
directly
power
wearable
electronics
harsh
cold
This
work
inspires
route
for
multifunctional
promises
practical
self‐powered
devices
extreme
environments.
Advanced Functional Materials,
Journal Year:
2021,
Volume and Issue:
31(40)
Published: July 11, 2021
Abstract
Electronic
skin
(e‐skin)
is
driving
significant
advances
in
flexible
electronics
as
it
holds
great
promise
health
monitoring,
human–machine
interfaces,
soft
robotics,
and
so
on.
Flexible
sensors
that
can
detect
various
stimuli
or
have
multiple
properties
play
an
indispensable
role
e‐skin.
Despite
tremendous
research
efforts
devoted
to
with
excellent
performance
regarding
a
certain
sensing
mode
property,
emerging
e‐skin
demands
multifunctional
be
endowed
the
skin‐like
capability
beyond.
Considering
outstanding
superiorities
of
electrical
conductivity,
chemical
stability,
ease
functionalization,
carbon
materials
are
adopted
implement
sensors.
In
this
review,
latest
carbon‐based
regard
types
detection
modes
abundant
introduced.
The
corresponding
preparation
process,
device
structure,
mechanism,
obtained
performance,
intriguing
applications
highlighted.
Furthermore,
diverse
systems
by
integrating
current
cutting‐edge
technologies
(e.g.,
data
acquisition
transmission,
neuromorphic
technology,
artificial
intelligence)
systematically
investigated
detail.
Finally,
existing
problems
future
developing
directions
also
proposed.
ACS Applied Materials & Interfaces,
Journal Year:
2021,
Volume and Issue:
13(42), P. 50281 - 50297
Published: Oct. 12, 2021
Flexible
sensors
have
attracted
great
research
interest
due
to
their
applications
in
artificial
intelligence,
wearable
electronics,
and
personal
health
management.
However,
the
inherent
brittleness
of
common
hydrogels,
preparing
a
hydrogel-based
sensor
integrated
with
excellent
flexibility,
self-recovery,
antifatigue
properties
still
remains
challenge
date.
In
this
study,
type
physically
chemically
dual-cross-linked
conductive
hydrogels
based
on
2,2,6,6-tetramethylpiperidine-1-oxyl
(TEMPO)-oxidized
cellulose
nanofiber
(TOCN)-carrying
carbon
nanotubes
(CNTs)
polyacrylamide
(PAAM)
matrix
via
facial
one-pot
free-radical
polymerization
is
developed
for
multifunctional
sensing
application.
Inside
hierarchical
gel
network,
TOCNs
not
only
serve
as
nanoreinforcement
toughening
effect
but
also
efficiently
assist
homogeneous
distribution
CNTs
hydrogel
matrix.
The
optimized
TOCN-CNT/PAAM
integrates
high
compressive
(∼2.55
MPa
at
60%
strain)
tensile
(∼0.15
MPa)
strength,
intrinsic
self-recovery
property
(recovery
efficiency
>92%),
capacity
under
both
cyclic
stretching
pressing.
assembled
by
exhibit
strain
sensitivity
(gauge
factor
≈11.8
100-200%
good
pressure
ability
over
large
range
(0-140
kPa),
which
can
effectively
detect
subtle
large-scale
human
motions
through
repeatable
stable
electrical
signals
even
after
100
loading-unloading
cycles.
comprehensive
performance
superior
those
most
gel-based
previously
reported,
indicating
its
potential
devices
healthcare
systems
motion
monitoring.
Materials Today Bio,
Journal Year:
2023,
Volume and Issue:
19, P. 100582 - 100582
Published: Feb. 16, 2023
Hydrogels
are
essential
biomaterials
due
to
their
favorable
biocompatibility,
mechanical
properties
similar
human
soft
tissue
extracellular
matrix,
and
repair
properties.
In
skin
wound
repair,
hydrogels
with
antibacterial
functions
especially
suitable
for
dressing
applications,
so
novel
hydrogel
dressings
have
attracted
widespread
attention,
including
the
design
of
components,
optimization
preparation
methods,
strategies
reduce
bacterial
resistance,
etc.
this
review,
we
discuss
fabrication
challenges
associated
crosslinking
methods
chemistry
materials.
We
investigated
advantages
limitations
(antibacterial
effects
mechanisms)
different
components
in
achieve
good
properties,
response
stimuli
such
as
light,
sound,
electricity
resistance.
Conclusively,
provide
a
systematic
summary
findings
(crosslinking
methods)
an
outlook
on
long-lasting
effects,
broader
spectrum,
diversified
forms,
future
development
prospects
field.
Advanced Functional Materials,
Journal Year:
2020,
Volume and Issue:
30(49)
Published: Sept. 6, 2020
Abstract
Gelatin
methacryloyl
(GelMA)
is
a
widely
used
hydrogel
with
skin‐derived
gelatin
acting
as
the
main
constituent.
However,
GelMA
has
not
been
in
development
of
wearable
biosensors,
which
are
emerging
devices
that
enable
personalized
healthcare
monitoring.
This
work
highlights
potential
for
biosensing
applications
by
demonstrating
fully
solution‐processable
and
transparent
capacitive
tactile
sensor
microstructured
core
dielectric
layer.
A
robust
chemical
bonding
reliable
encapsulation
approach
introduced
to
overcome
detachment
water‐evaporation
issues
biosensors.
The
resultant
shows
high‐pressure
sensitivity
0.19
kPa
−1
one
order
magnitude
lower
limit
detection
(0.1
Pa)
compared
previous
pressure
sensors
owing
its
excellent
mechanical
electrical
properties
(dielectric
constant).
Furthermore,
it
durability
up
3000
test
cycles
because
tough
bonding,
long‐term
stability
3
days
due
inclusion
an
layer,
prevents
water
evaporation
(80%
content).
Successful
monitoring
various
human
physiological
motion
signals
demonstrates
these
applications.
Journal of Materials Chemistry A,
Journal Year:
2020,
Volume and Issue:
8(46), P. 24718 - 24733
Published: Jan. 1, 2020
A
self-healing
hydrogel
ionic
conductor
has
been
developed
by
combining
dynamic
covalent
chemistry
with
nanofiller
reinforcement
and
micelle
crosslinking,
used
for
sensing
of
diverse
human
activities.
