Chemistry of Materials,
Год журнала:
2022,
Номер
34(3), С. 1065 - 1077
Опубликована: Янв. 21, 2022
Ionic
hydrogels
hold
substantial
promise
as
soft
materials
for
achieving
versatile
wearable
ionotronics
due
to
the
integrated
merits
of
appropriate
mechanical
properties,
excellent
conductivity,
and
good
conformability.
However,
overcoming
freezing
at
subzero
temperatures
hindering
evaporation
water
are
still
huge
challenges
ionic
hydrogels.
Herein,
a
dual-cross-linked
ionohydrogel
was
designed
using
Al3+
cross-link
with
polymer
network
through
dynamic
metal
coordination
bonds
in
liquid
(IL)
binary
solvent
system,
allowing
properties
(∼1
MPa,
∼600%),
transparency
(>90%),
high
conductivity
(∼12.40
mS
cm–1),
robust
adhesion,
along
advantages
superior
antifreezing
long-term
antidehydration
properties.
These
exceptional
characteristics
inspired
us
fabricate
dual-responsive
sensors,
which
could
simultaneously
detect
human
motion
signals
wide
range
change
(from
−30
40
°C)
an
impressive
temperature
coefficient
resistance
(TCR)
value
−0.035
−0.44
°C–1).
More
promisingly,
benefiting
from
interfacial
adhesion
between
poly(dimethylsiloxane)
(PDMS)
ionohydrogels,
triboelectric
nanogenerator
assembled
single-electrode
mode
that
capable
providing
sustainable
energy
ionotronic
devices
even
temperatures.
This
work
opens
up
effective
strategy
design
multifunctional
ionohydrogel,
enabling
various
applications
into
single
device.
Abstract
Conductive
hydrogels
as
promising
material
candidates
for
soft
electronics
have
been
rapidly
developed
in
recent
years.
However,
the
low
ionic
conductivity,
limited
mechanical
properties,
and
insufficient
freeze‐resistance
greatly
limit
their
applications
flexible
wearable
electronics.
Herein,
aramid
nanofiber
(ANF)‐reinforced
poly(vinyl
alcohol)
(PVA)
organohydrogels
containing
dimethyl
sulfoxide
(DMSO)/H
2
O
mixed
solvents
with
outstanding
are
fabricated
through
solution
casting
3D
printing
methods.
The
show
both
high
tensile
strength
toughness
due
to
synergistic
effect
of
ANFs
DMSO
system,
which
promotes
PVA
crystallization
intermolecular
hydrogen
bonding
interactions
between
molecules
well
PVA,
confirmed
by
a
suite
characterization
molecular
dynamics
simulations.
also
exhibit
ultrahigh
ranging
from
1.1
34.3
S
m
−1
at
−50
60
°C.
Building
on
these
excellent
organohydrogel‐based
strain
sensors
solid‐state
zinc–air
batteries
(ZABs)
fabricated,
broad
working
temperature
range.
Particularly,
ZABs
not
only
specific
capacity
(262
mAh
g
)
ultra‐long
cycling
life
(355
cycles,
118
h)
even
−30
°C,
but
can
work
properly
under
various
deformation
states,
manifesting
great
potential
robotics
ACS Applied Materials & Interfaces,
Год журнала:
2022,
Номер
15(1), С. 2147 - 2162
Опубликована: Дек. 23, 2022
Flexible
sensing
devices
(FSDs)
fabricated
using
conductive
hydrogels
have
attracted
researchers'
extensive
enthusiasm
in
recent
years
due
to
their
versatility.
Considering
the
complexity
of
application
environments,
integration
various
functional
characteristics
(e.g.,
excellent
mechanical,
antibacterial,
and
antifreezing
properties)
is
an
important
guarantee
for
FSDs
stably
perform
applications
different
environments.
Herein,
we
developed
a
multifunctional
polyvinyl
alcohol
(PVA)
organohydrogel
PVA-CT-Ag-Al-Gly
(PCAAG)
by
green,
natural,
cheap
biomass,
chestnut
tannin
(CT),
as
crosslinking
agent,
nano-silver
particles
(AgNPs)
antimicrobial
aluminum
trichloride
(AlCl3)
conducting
medium,
mixed
water-glycerol
solvent
system.
In
this
system,
CT
acted
not
only
reducing
stabilizing
agent
preparation
antibacterial
AgNPs
but
also
owing
its
strong
multiple
hydrogen
bonding
interactions
with
PVA,
realizing
application.
The
PCAAG
possessed
outstanding
physical
mechanical
properties
(350.54%
maximum
fracture
strain
1.55
MPa
tensile
strength),
considerable
bacteriostatic
effects
against
both
Escherichia
coli
Staphylococcus
aureus,
freeze
resistance
(it
could
function
normally
at
-20
°C).
motion-monitoring
sensor
based
on
exhibited
specificity
recognition
large-amplitude
elbow
bending,
wrist
finger
running
walking,
etc.)
small-amplitude
(frowning
swallowing)
human
movements.
flexible
keyboard
constructed
easily
achieve
transformation
between
digital
signals
electrical
signals,
signal
output
had
stability.
velocity-monitoring
accurately
measure
speed
object
movement
(less
than
3%
relative
error).
short,
present
solves
problems
single
environment
few
scenarios
traditional
possesses
remarkable
potential
FSD
many
fields
such
artificial
intelligence,
sport
management,
soft
robots,
human-computer
interface.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(42)
Опубликована: Июнь 24, 2023
Abstract
E‐skins
based
on
conductive
hydrogels
are
regarded
as
ideal
candidates
for
sensing
application.
However,
limited
by
the
constructed
materials
and
strategies,
current
have
poor
mechanical
properties,
single
function,
unsatisfactory
conductivity,
which
seriously
hinder
their
development
Herein,
natural
goatskin
with
hierarchical
3D
network
structure
weaved
collagen
fibers
is
used
substrate
material
construction
of
ultra‐tough
hydrogel
through
a
“top‐down”
strategy,
in
acrylic
acid
monomer
first
vacuum‐impregnated
into
interstices
skeleton
then
polymerized
situ
to
produce
skin‐based
unique
wrapping
structure.
Based
hydrogel,
load‐carrying
capacity,
after
loaded
new
multifunctional
nanoscale‐conductive
medium
nanosilver
particles
(AgNPs)
1,3‐propanediol,
goatskin‐derived
organohydrogel
S@HCP
excellent
self‐adhesion,
transparency,
ultraviolet
shielding,
antibacterial,
biocompatibility,
environmental
stability,
conductivity.
Notably,
stretchable
S‐TENG
assembled
using
can
be
perfectly
suited
real‐life
applications
including
biomechanical
energy
harvesting,
self‐powered
tactile‐sensing,
motion
monitoring.
It
believed
that,
combining
animal
skin
different
functional
materials,
it
possible
reuse
skin,
“dead
skin,”
provides
platform
developing
flexible
e‐skin.
Nano-Micro Letters,
Год журнала:
2022,
Номер
15(1)
Опубликована: Дек. 7, 2022
To
date,
hydrogels
have
gained
increasing
attentions
as
a
flexible
conductive
material
in
fabricating
soft
electronics.
However,
it
remains
big
challenge
to
integrate
multiple
functions
into
one
gel
that
can
be
used
widely
under
various
conditions.
Herein,
kind
of
multifunctional
hydrogel
with
combination
desirable
characteristics,
including
remarkable
transparency,
high
conductivity,
ultra-stretchability,
toughness,
good
fatigue
resistance,
and
strong
adhesive
ability
is
presented,
which
was
facilely
fabricated
through
noncovalent
crosslinking
strategy.
The
resultant
versatile
sensors
are
able
detect
both
weak
large
deformations,
owns
low
detection
limit
0.1%
strain,
stretchability
up
1586%,
ultrahigh
sensitivity
gauge
factor
18.54,
well
wide
pressure
sensing
range
(0-600
kPa).
Meanwhile,
the
fabrication
hydrogel-based
demonstrated
for
electronic
devices,
human-machine
interactive
system,
tactile
switch,
an
integrated
skin
unprecedented
nonplanar
visualized
sensing,
stretchable
triboelectric
nanogenerators
excellent
biomechanical
energy
harvesting
ability.
This
work
opens
simple
route
promises
practical
application
self-powered
wearable
electronics
complex
scenes.
