ACS Applied Materials & Interfaces,
Journal Year:
2022,
Volume and Issue:
14(23), P. 26536 - 26547
Published: June 3, 2022
Flexible
wearable
devices
have
achieved
remarkable
applications
in
health
monitoring
because
of
the
advantages
multisignal
collecting
and
real-time
wireless
transmission
information.
However,
integration
bulky
sensing
elements
rigid
metal
circuit
components
traditional
may
lead
to
a
mechanical
signal-conducting
mismatch
between
biological
tissues,
thus
restricting
their
wide
human
body.
The
excellent
properties,
conductivity,
high
tissue
resemblance
conductive
hydrogel
contribute
its
application
flexible
electronic
sensors
monitor
health.
In
this
work,
dual-network,
temperature-responsive
ionic
with
stretchability,
fast
temperature
responsiveness,
good
conductivity
was
developed
by
introducing
polyvinylpyrrolidone
(PVP)/
tannic
acid
(TA)/
Fe3+
cross-linked
network
into
N,N-methylene
diacrylamide
(MBAA)
poly(N-isopropylacrylamide-co-acrylamide)
(P(NIPAAm-co-AM))
network.
Furthermore,
introduction
PVP/TA/Fe3+
endowed
stretchability
conductivity.
By
adjusting
molar
ratio
TA
3:5,
maximal
stretching
720%
sensitive
strain
response
(GF
=
3.61)
achieved,
showing
promising
both
large
fine
motions.
Moreover,
PNIPAAm
lower
critical
solution
(LCST),
be
used
environmental
through
temperature–conductivity
which
can
applied
as
sensor
detect
fever
or
hyperthermia
Advanced Functional Materials,
Journal Year:
2020,
Volume and Issue:
30(35)
Published: July 14, 2020
Abstract
To
date,
ionic
conducting
hydrogel
attracts
tremendous
attention
as
an
alternative
to
the
conventional
rigid
metallic
conductors
in
fabricating
flexible
devices,
owing
their
intrinsic
characteristics.
However,
simultaneous
realization
of
high
stiffness,
toughness,
conductivity,
and
freezing
tolerance
through
a
simple
approach
is
still
challenge.
Here,
novel
highly
stretchable
(up
660%),
strong
2.1
MPa),
tough
(5.25
MJ
m
−3
),
transparent
90%)
conductive
(3.2
S
−1
)
organohydrogel
facilely
fabricated,
sol–gel
transition
polyvinyl
alcohol
cellulose
nanofibrils
(CNFs)
dimethyl
sulfoxide‐water
solvent
system.
The
presents
superior
tolerance,
remaining
(1.1
even
at
−70
°C,
compared
other
reported
anti‐freezing
(organo)hydrogel.
Notably,
this
material
design
demonstrates
synergistic
effect
CNFs
boosting
both
mechanical
properties
tackling
long‐standing
dilemma
among
strength,
conductivity
for
hydrogel.
In
addition,
displays
sensitivity
toward
tensile
compressive
deformation
based
on
which
multi‐functional
sensors
are
assembled
detect
human
body
movement
with
sensitivity,
stability,
durability.
This
envisioned
function
versatile
platform
future.
Advanced Materials,
Journal Year:
2020,
Volume and Issue:
33(6)
Published: Aug. 23, 2020
Abstract
Stretchable
electronics,
which
can
retain
their
functions
under
stretching,
have
attracted
great
interest
in
recent
decades.
Elastic
substrates,
bear
the
applied
strain
and
regulate
distribution
circuits,
are
indispensable
components
stretchable
electronics.
Moreover,
self‐healing
property
of
substrate
is
a
premise
to
endow
electronics
with
same
characteristics,
so
device
may
recover
from
failure
resulting
large
frequent
deformations.
Therefore,
properties
elastic
crucial
overall
performance
devices.
Poly(dimethylsiloxane)
(PDMS)
widely
used
as
material
for
not
only
because
its
advantages,
include
stable
chemical
properties,
good
thermal
stability,
transparency,
biological
compatibility,
but
also
capability
attaining
designer
functionalities
via
surface
modification
bulk
tailoring.
Herein,
strategies
fabricating
on
PDMS
substrates
summarized,
influence
physical
PDMS,
including
status,
modulus,
geometric
structures,
discussed.
Finally,
challenges
future
opportunities
based
considered.
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.
Small,
Journal Year:
2021,
Volume and Issue:
18(5)
Published: Oct. 17, 2021
Abstract
Conductive
hydrogels
can
be
prepared
by
incorporating
various
conductive
materials
into
polymeric
network
hydrogels.
In
recent
years,
have
been
developed
and
applied
in
the
field
of
strain
sensors
owing
to
their
unique
properties,
such
as
electrical
conductivity,
mechanical
self‐healing,
anti‐freezing
properties.
These
remarkable
properties
allow
hydrogel‐based
show
excellent
performance
for
identifying
external
stimuli
detecting
human
body
movement,
even
at
subzero
temperatures.
This
review
summarizes
application
fabrication
working
different
modes.
Finally,
a
brief
prospectus
development
future
is
provided.
Advanced Materials,
Journal Year:
2020,
Volume and Issue:
32(52)
Published: Nov. 9, 2020
Abstract
Physical
hydrogels
from
existing
polymers
consisting
of
noncovalent
interacting
networks
are
highly
desired
due
to
their
well‐controlled
compositions
and
environmental
friendliness;
therefore,
applied
as
adhesives,
artificial
tissues,
soft
machines.
Nevertheless,
these
gels
have
suffered
weak
mechanical
strength
low
water
resistance.
Current
methodologies
used
fabricate
mainly
involve
the
freezing–thawing
process
(cryogels),
which
complicated
in
preparation
short
adjustment
polymer
conformation.
Here,
taking
merits
bonds
adjustability
reversibility,
a
solvent‐exchange
strategy
is
developed
construct
class
exogels.
Based
on
exchange
good
solvent
subsequently
poor
one,
intra‐
interpolymer
interactions
initially
suppressed
then
recovered,
resulting
dissolving
cross‐linking
polymers,
respectively.
Key
this
approach
solvent,
favors
stretched
conformation
homogenize
network,
forming
cross‐linked
hydrogel
with
remarkable
stiffness,
toughness,
antiswelling
properties,
thus
underwater
adhesive
performance.
The
exogels
highlight
facile
but
effective
turning
consequently
achieve
rational
design
enhanced
hydrogel‐based
materials.
Materials Horizons,
Journal Year:
2020,
Volume and Issue:
7(7), P. 1872 - 1882
Published: Jan. 1, 2020
Stretchable,
self-healing,
and
fatigue
resistant
polyzwitterionic
nanocomposite
hydrogels
with
polydopamine
robustly
adhere
to
the
heart
lungs
for
in
situ
monitoring
of
dynamic
motions
through
wireless
transmission.
ACS Materials Letters,
Journal Year:
2020,
Volume and Issue:
2(10), P. 1287 - 1301
Published: Aug. 25, 2020
Conductive
hydrogels
are
widely
used
in
various
applications,
such
as
artificial
skin,
flexible
and
implantable
bioelectronics,
tissue
engineering.
However,
it
is
still
a
challenge
to
formulate
with
high
electrical
conductivity
without
compromising
their
physicochemical
properties
(e.g.,
toughness,
stretchability,
biocompatibility).
Additionally,
incorporating
other
functions,
self-healing,
shape
memory,
wet
adhesion,
into
conductive
critical
many
practical
applications
of
hydrogel
bioelectronics.
In
this
Review,
we
highlight
recent
progress
the
development
functional
hydrogels.
We,
then,
discuss
potential
challenges
faced
by
areas
wearable/implantable
electronics
cell/tissue
can
serve
an
important
building
block
for
bioelectronic
devices
personalized
healthcare
bioengineering
areas.
