Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(16)
Published: Jan. 2, 2024
Abstract
Wearable
electronics
based
on
conductive
hydrogels
(CHs)
easily
suffer
from
prolonged
response
times,
reduced
wearing
comfort,
shortened
service
lives,
and
impaired
signal
accuracy
in
cold
environments,
because
conventional
CHs
tend
to
freeze
at
subzero
temperatures
lose
their
flexibility,
adhesion,
transparency,
conductivity,
which
will
limit
applications
extreme
environments.
Inspired
by
the
way
psychrotolerant
creatures
superabsorbent
materials
interfere
with
hydrogen
bonding
networks
of
water,
a
freeze‐resistant
organohydrogel
(COH)
is
facilely
fabricated.
The
synergy
effect
between
charged
polar
terminal
groups
binary
solvent
system
water–ethylene
glycol
weakens
water
molecules
endows
COH
remarkable
freezing
tolerance
(−78
°C).
Additionally,
obtained
ultra‐stretchable
(≈6185%),
tough
(9.2
MJ
m
−3
),
highly
transparent
(≈99%),
self‐adhesive
(10.2–27.8
kPa),
biocompatible.
This
versatile
assembled
into
strain
sensor
well‐designed
bracelet
electrocardiogram
sensor.
Benefiting
exceptional
low‐temperature
prepared
COH,
these
devices
exhibit
fast
delay‐free
signals
even
−40
°C.
Overall,
this
work
proposes
strategy
develop
multifunctional
COHs
for
supporting
human
health
Nature Communications,
Journal Year:
2022,
Volume and Issue:
13(1)
Published: June 21, 2022
Ionic
conductive
hydrogels
prepared
from
naturally
abundant
cellulose
are
ideal
candidates
for
constructing
flexible
electronics
the
perspective
of
commercialization
and
environmental
sustainability.
However,
cellulosic
featuring
both
high
mechanical
strength
ionic
conductivity
remain
extremely
challenging
to
achieve
because
charge
carriers
tend
destroy
hydrogen-bonding
network
among
cellulose.
Here
we
propose
a
supramolecular
engineering
strategy
boost
performance
by
incorporating
bentonite
(BT)
via
strong
cellulose-BT
coordination
interaction
ion
regulation
capability
nanoconfined
intercalated
nanostructure.
A
(compressive
up
3.2
MPa),
tough
(fracture
energy
0.45
MJ
m-3),
yet
highly
freezing
tolerant
(high
conductivities
89.9
25.8
mS
cm-1
at
25
-20
°C,
respectively)
all-natural
hydrogel
is
successfully
realized.
These
findings
open
new
perspectives
design
beyond.
Advanced Energy Materials,
Journal Year:
2022,
Volume and Issue:
13(1)
Published: Nov. 18, 2022
Abstract
The
advancement
of
the
Internet
Things/5G
infrastructure
requires
a
low‐cost
ubiquitous
sensory
network
to
realize
an
autonomous
system
for
information
collection
and
processing,
aiming
at
diversified
applications
ranging
from
healthcare,
smart
home,
industry
4.0
environmental
monitoring.
triboelectric
nanogenerator
(TENG)
is
considered
most
promising
technology
due
its
self‐powered,
cost‐effective,
highly
customizable
advantages.
Through
use
wearable
electronic
devices,
advanced
TENG
developed
as
core
enabling
self‐powered
sensors,
power
supplies,
data
communications
aforementioned
applications.
In
this
review,
advancements
TENG‐based
electronics
regarding
materials,
material/device
hybridization,
systems
integration,
convergence,
in
environment
monitoring,
transportation,
homes
toward
future
green
earth
are
reported.
Chemical Society Reviews,
Journal Year:
2022,
Volume and Issue:
51(9), P. 3759 - 3793
Published: Jan. 1, 2022
Skin
bioelectronics
are
considered
as
an
ideal
platform
for
personalised
healthcare
because
of
their
unique
characteristics,
such
thinness,
light
weight,
good
biocompatibility,
excellent
mechanical
robustness,
and
great
skin
conformability.
Recent
advances
in
skin-interfaced
have
promoted
various
applications
precision
medicine.
Particularly,
long-term,
continuous
health
monitoring
offer
powerful
analysis
a
broad
spectrum
statuses,
providing
route
to
early
disease
diagnosis
treatment.
In
this
review,
we
discuss
(1)
representative
sensing
devices,
(2)
material
structure
selection,
device
properties,
wireless
technologies
towards
monitoring,
(3)
applications:
acquisition
electrophysiological,
biophysical,
biochemical
signals,
comprehensive
(4)
rational
guidelines
the
design
future
monitoring.
Long-term,
advanced
will
open
unprecedented
opportunities
timely
prevention,
screening,
diagnosis,
treatment,
demonstrating
promise
revolutionise
traditional
medical
practices.
Advanced Materials,
Journal Year:
2022,
Volume and Issue:
34(17)
Published: March 1, 2022
Halide-perovskite-based
mechanical
energy
harvesters
display
excellent
electrical
output
due
to
their
unique
ferroelectricity
and
dielectricity.
However,
high
toxicity
moisture
sensitivity
impede
practical
applications.
Herein,
a
stretchable,
breathable,
stable
nanofiber
composite
(LPPS-NFC)
is
fabricated
through
electrospinning
of
lead-free
perovskite/poly(vinylidene
fluoride-co-hexafluoropropylene)
(PVDF-HFP)
styrene-ethylene-butylene-styrene
(SEBS).
The
Cs3
Bi2
Br9
perovskites
serve
as
efficient
electron
acceptors
local
nucleating
agents
for
the
crystallization
polymer
chains,
thereby
enhancing
electron-trapping
capacity
polar
crystalline
phase
in
LPPS-NFC.
level
matching
between
PVDF-HFP
boosts
transfer
efficiency
reduces
charge
loss,
promoting
process.
Consequently,
this
LPPS-NFC-based
harvester
displays
an
(400
V,
1.63
µA
cm-2
,
2.34
W
m-2
),
setting
record
voltage
among
halide-perovskite-based
nanogenerators.
LPPS-NFC
also
exhibits
stretchability,
waterproofness,
breathability,
enabling
fabrication
robust
wearable
devices
that
convert
from
different
biomechanical
motions
into
power
drive
common
electronic
devices.
endure
extreme
deformations
(washing,
folding,
crumpling)
without
performance
degradation,
maintain
up
5
months,
demonstrating
promising
potential
use
smart
textiles
sources.
Advanced Science,
Journal Year:
2023,
Volume and Issue:
10(28)
Published: Aug. 6, 2023
Hydrogels
with
tailor-made
swelling-shrinkable
properties
have
aroused
considerable
interest
in
numerous
biomedical
domains.
For
example,
as
swelling
is
a
key
issue
for
blood
and
wound
extrudates
absorption,
the
transference
of
nutrients
metabolites,
well
drug
diffusion
release,
hydrogels
high
capacity
been
widely
applicated
full-thickness
skin
healing
tissue
regeneration,
delivery.
Nevertheless,
fields
adhesives
internal
soft-tissue
healing,
bioelectronics,
non-swelling
play
very
important
functions
owing
to
their
stable
macroscopic
dimension
physical
performance
physiological
environment.
Moreover,
negative
behavior
(i.e.,
shrinkage)
can
be
exploited
drive
noninvasive
closure,
achieve
resolution
enhancement
hydrogel
scaffolds.
In
addition,
it
help
push
out
entrapped
drugs,
thus
promote
release.
However,
there
still
has
not
general
review
constructions
applications
from
viewpoint
properties.
Therefore,
this
summarizes
tactics
employed
so
far
tailoring
applications.
And
relatively
comprehensive
understanding
current
progress
future
challenge
different
features
provided
potential
clinical
translations.
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.
Nano-Micro Letters,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: April 15, 2023
Growing
health
awareness
triggers
the
public's
concern
about
problems.
People
want
a
timely
and
comprehensive
picture
of
their
condition
without
frequent
trips
to
hospital
for
costly
cumbersome
general
check-ups.
The
wearable
technique
provides
continuous
measurement
method
monitoring
by
tracking
person's
physiological
data
analyzing
it
locally
or
remotely.
During
process,
different
kinds
sensors
convert
signals
into
electrical
optical
that
can
be
recorded
transmitted,
consequently
playing
crucial
role
in
techniques.
Wearable
application
scenarios
usually
require
possess
excellent
flexibility
stretchability.
Thus,
designing
flexible
stretchable
with
reliable
performance
is
key
technology.
Smart
composite
hydrogels,
which
have
tunable
properties,
mechanical
biocompatibility,
multi-stimulus
sensitivity,
are
one
best
sensitive
materials
monitoring.
This
review
summarizes
common
synthetic
optimization
strategies
smart
hydrogels
focuses
on
current
field
Advanced Functional Materials,
Journal Year:
2021,
Volume and Issue:
31(27)
Published: April 23, 2021
Abstract
Traditional
hydrogels
always
lose
their
flexibility
and
functions
in
dry
environments
because
the
internal
water
inevitably
undergoes
evaporation.
In
this
study,
a
skin‐inspired,
facile,
versatile
strategy
for
developing
encapsulated
with
excellent
retention
capacity
through
double‐hydrophobic
coating
is
proposed.
The
robust
double‐layer
coating,
which
integrates
hydrophobic
polymer
oil
layer
simultaneously,
can
provide
barrier
to
prevent
evaporation
of
water.
To
overcome
weak
interfacial
strength
between
hydrophilic
hydrogel
surface
(3‐aminopropyl)
triethoxysilane
(APTES)
utilized
as
chemical
binding
agent.
Furthermore,
overall
mechanical
properties
bulk
are
not
significantly
affected,
only
anchored
its
thickness
much
lower
than
that
native
hydrogel.
Moreover,
it
demonstrated
proposed
particularly
holds
capability
encapsulating
various
types
different
shapes
hydrogels,
leading
enhanced
stability
prolonged
lifetime
air.
Therefore,
technology
provides
new
insights
multifarious
functionalization
broadens
range
applications.
Biomacromolecules,
Journal Year:
2021,
Volume and Issue:
22(3), P. 1220 - 1230
Published: Feb. 15, 2021
Multifunctional
hydrogel
with
outstanding
conductivity
and
mechanical
flexibility
has
received
enormous
attention
as
wearable
electronic
devices.
However,
fabricating
transparent,
ultrastretchable,
biocompatible
low-temperature
stability
still
remains
a
tremendous
challenge.
In
this
study,
an
highly
antifreezing
zwitterionic-based
sensor
is
developed
by
introducing
zwitterionic
proline
(ZP)
into
gellan
gum/polyacrylamide
(GG/PAAm)
double
network
(DN)
hydrogel.
The
existence
of
ZP
endows
the
remarkable
frost
resistance.
toughness
transparency
Ca-GG/PAAm-ZP
DN
can
be
maintained
down
to
−40
°C.
Also,
shows
good
biocompatibility
protein
adsorption
hydrogel-based
strain
accurately
monitor
human
motions
(such
speaking
various
joint
bendings)
under
broad
temperature
range
from
25
will
immense
value
in
field
devices,
especially
for
extreme
environment
applications.
