Langmuir,
Journal Year:
2024,
Volume and Issue:
40(10), P. 5288 - 5296
Published: Feb. 28, 2024
A
kind
of
ionic
conductive
gel
(also
named
eutectogel)
is
developed
from
an
inorganic
salt
(ZnCl2)-based
deep
eutectic
solvent
(DES).
The
ternary
DES
consists
ZnCl2,
acrylic
acid,
and
water,
cotton
linter
cellulose
introduced
into
the
system
to
tailor
its
mechanical
properties.
Enabled
by
extensive
hydrogen
bonds
ion–dipole
interactions,
obtained
eutectogel
displays
superior
conductivity
(0.33
S/m),
high
stretchability
(up
2050%),
large
tensile
strength
(1.82
MPa),
wide
temperature
tolerance
(−40
60
°C).
In
particular,
water-induced
coordination
interactions
can
tune
hydrogen/ionic
in
eutectogels,
imparting
them
with
appealing
humidity
sensing
ability
complex
extreme
conditions.
Nano-Micro Letters,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: May 24, 2023
Abstract
Breathing
is
an
inherent
human
activity;
however,
the
composition
of
air
we
inhale
and
gas
exhale
remains
unknown
to
us.
To
address
this,
wearable
vapor
sensors
can
help
people
monitor
in
real
time
avoid
underlying
risks,
for
early
detection
treatment
diseases
home
healthcare.
Hydrogels
with
three-dimensional
polymer
networks
large
amounts
water
molecules
are
naturally
flexible
stretchable.
Functionalized
hydrogels
intrinsically
conductive,
self-healing,
self-adhesive,
biocompatible,
room-temperature
sensitive.
Compared
traditional
rigid
sensors,
hydrogel-based
humidity
directly
fit
skin
or
clothing,
more
suitable
real-time
monitoring
personal
health
safety.
In
this
review,
current
studies
on
investigated.
The
required
properties
optimization
methods
introduced.
Subsequently,
existing
reports
response
mechanisms
summarized.
Related
works
their
application
safety
presented.
Moreover,
potential
field
sensing
elucidated.
Finally,
research
status,
challenges,
future
trends
hydrogel
gas/humidity
discussed.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(21)
Published: Feb. 17, 2023
Abstract
Flexible
gas
sensors
play
an
indispensable
role
in
diverse
applications
spanning
from
environmental
monitoring
to
portable
medical
electronics.
Full
wearable
system
requires
the
collaborative
support
of
high‐performance
and
miniaturized
circuit
module,
whereas
realization
low
power
consumption
sustainable
measurement
is
challenging.
Here,
a
self‐powered
reusable
all‐in‐one
NO
2
sensor
proposed
by
structurally
functionally
coupling
battery,
with
ultrahigh
sensitivity
(1.92%/ppb),
linearity
(
R
=
0.999),
ultralow
theoretical
detection
limit
(0.1
ppb),
humidity
immunity.
This
can
be
attributed
regulation
reaction
route
at
molecular
level.
The
addition
amphiphilic
zinc
trifluoromethanesulfonate
(Zn(OTf)
)
enables
H
O‐poor
inner
Helmholtz
layer
constructed
electrode–gel
interface,
thereby
facilitating
direct
charge
transfer
process
here.
device
then
combined
well‐designed
low‐power
module
signal
conditioning,
processing
wireless
transmission
functions,
which
used
as
electronics
realize
early
remote
warning
leakage.
study
demonstrates
promising
way
design
self‐powered,
sustainable,
flexible
high
performance
its
corresponding
sensing
system,
providing
new
insight
into
detection.
Advanced Science,
Journal Year:
2022,
Volume and Issue:
10(6)
Published: Dec. 23, 2022
Stretchable
hydrogel-based
strain
sensors
suffer
from
limited
sensitivity,
which
urgently
requires
further
breakthroughs
for
precise
and
stable
human-computer
interaction.
Here,
an
efficient
microstructural
engineering
strategy
is
proposed
to
significantly
enhance
the
sensitivity
of
by
sandwiching
emulsion-polymerized
polyacrylamide
organohydrogel
microsphere
membrane
between
two
Ecoflex
films,
are
accompanied
crack
generation
propagation
effects
upon
stretching.
Consequently,
as-developed
sensor
exhibits
ultrahigh
(gauge
factor
(GF)
1275),
wide
detection
range
(100%
strain),
low
hysteresis,
ultralow
limit
(0.05%
good
fatigue
resistance,
fabrication
cost.
In
addition,
features
water,
dehydration,
frost
enabling
real-time
monitoring
in
various
complex
conditions
due
encapsulation
film
addition
glycerol
KCl.
Through
structural
manipulation,
device
achieves
superior
response
tiny
strains,
with
a
GF
value
98.3
less
than
1.5%.
Owing
high
sensing
performance,
able
detect
human
activities
swallowing
finger
bending
even
under
water.
On
this
basis,
wireless
system
apnea
warning
single-channel
gesture
recognition
capabilities
successfully
demonstrated,
demonstrating
its
great
promise
as
wearable
electronics.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
35(41)
Published: June 26, 2023
The
utilization
of
printing
techniques
for
the
development
high-performance
humidity
sensors
holds
immense
significance
various
applications
in
fields
Internet
Things,
agriculture,
human
healthcare,
and
storage
environments.
However,
long
response
time
low
sensitivity
current
printed
limit
their
practical
applications.
Herein,
a
series
high-sensing-performance
flexible
resistive-type
is
fabricated
by
screen-printing
method,
hexagonal
tungsten
oxide
(h-WO3
)
employed
as
humidity-sensing
material
due
to
its
cost,
strong
chemical
adsorption
ability,
excellent
ability.
as-prepared
exhibit
high
sensitivity,
good
repeatability,
outstanding
flexibility,
hysteresis,
fast
(1.5
s)
wide
relative
(RH)
range
(11-95%
RH).
Furthermore,
can
be
easily
adjusted
altering
manufacturing
parameters
sensing
layer
interdigital
electrode
meet
diverse
requirements
specific
possess
potential
applications,
including
wearable
devices,
non-contact
measurements,
packaging
opening
state
monitoring.
Nature Communications,
Journal Year:
2023,
Volume and Issue:
14(1)
Published: Aug. 26, 2023
Timely
and
remote
biomarker
detection
is
highly
desired
in
personalized
medicine
health
protection
but
presents
great
challenges
the
devices
reported
so
far.
Here,
we
present
a
cost-effective,
flexible
self-powered
sensing
device
for
H2S
analysis
various
application
scenarios
based
on
structure
of
galvanic
cells.
The
mechanism
attributed
to
change
electrode
potential
resulting
from
chemical
adsorption
gas
molecules
surfaces.
Intrinsically
stretchable
organohydrogels
are
used
as
solid-state
electrolytes
enable
stable
long-term
operation
under
stretching
deformation
or
environments.
open-circuit
exhibits
high
sensitivity,
low
limit,
excellent
selectivity
H2S.
Its
non-invasive
halitosis
diagnosis
identification
meat
spoilage
demonstrated,
emerging
commercial
value
portable
medical
electronics
food
security.
A
wireless
sensory
system
has
also
been
developed
monitoring
with
participation
Bluetooth
cloud
technologies.
This
work
breaks
through
shortcomings
traditional
chemiresistive
sensors,
offering
direction
theoretical
foundation
designing
wearable
sensors
catering
other
stimulus
requirements.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(27)
Published: April 23, 2024
Wireless
and
wearable
sensors
attract
considerable
interest
in
personalized
healthcare
by
providing
a
unique
approach
for
remote,
noncontact,
continuous
monitoring
of
various
health-related
signals
without
interference
with
daily
life.
Recent
advances
wireless
technologies
have
promoted
practical
applications
due
to
their
significantly
improved
characteristics,
such
as
reduction
size
thickness,
enhancement
flexibility
stretchability,
conformability
the
human
body.
Currently,
most
researches
focus
on
active
materials
structural
designs
sensors,
just
few
exceptions
reflecting
data
transmission.
This
review
provides
comprehensive
overview
state-of-the-art
related
studies
empowering
sensors.
The
emerging
functional
nanomaterials
utilized
designing
modules
are
highlighted,
which
include
metals,
carbons,
MXenes.
Additionally,
outlines
system-level
integration
flexible
spanning
from
novel
design
strategies
enhanced
efficient
transmitting
wirelessly.
Furthermore,
introduces
representative
remote
noninvasive
physiological
through
on-skin
implantable
sensing
systems.
Finally,
challenges,
perspectives,
unprecedented
opportunities
discussed.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
16(1)
Published: Jan. 4, 2024
Abstract
The
development
of
bioinspired
gradient
hydrogels
with
self-sensing
actuated
capabilities
for
remote
interaction
soft-hard
robots
remains
a
challenging
endeavor.
Here,
we
propose
novel
multifunctional
hydrogel
that
combines
ultrafast
actuation
and
high
sensitivity
robotic
hand.
network
structure,
achieved
through
wettability
difference
method
involving
the
rapid
precipitation
MoO
2
nanosheets,
introduces
hydrophilic
disparities
between
two
sides
within
hydrogel.
This
distinctive
approach
bestows
thermo-responsive
(21°
s
−1
)
enhanced
photothermal
efficiency
(increase
by
3.7
°C
under
808
nm
near-infrared).
Moreover,
local
cross-linking
sodium
alginate
Ca
2+
endows
programmable
deformability
information
display
capabilities.
Additionally,
exhibits
(gauge
factor
3.94
wide
strain
range
600%),
fast
response
times
(140
ms)
good
cycling
stability.
Leveraging
these
exceptional
properties,
incorporate
into
various
soft
actuators,
including
gripper,
artificial
iris,
jellyfish,
as
well
wearable
electronics
capable
precise
human
motion
physiological
signal
detection.
Furthermore,
synergistic
combination
remarkable
sensitivity,
realize
touch
tongue.
Notably,
employing
quantitative
analysis
actuation-sensing,
robot
via
Internet
Things.
presented
in
this
study
provides
new
insight
advanced
somatosensory
materials,
self-feedback
intelligent
human–machine
interactions.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(38)
Published: May 3, 2024
Abstract
Real‐time
monitoring
of
respiration
plays
a
very
important
role
in
human
health
assessment,
especially
and
analyzing
during
exercise
sleep.
However,
traditional
humidity
sensors
still
have
problems
flexibility,
sensitivity,
durability,
so
there
is
an
urgent
need
to
develop
with
high
stretchability,
environmental
resistance
as
respiratory
applications.
Here,
based
on
the
double
network
hydrogel
structure
polyvinyl
alcohol
polyacrylamide,
highly
sensitive,
stretchable,
environmentally
stable
organic
sensor
has
been
manufactured
by
using
synergistic
effect
lithium
chloride
MXene.
The
shows
rapid
response
range
40–85%
RH,
sensitivity
−103.4%/%
RH.
In
addition,
it
exhibits
more
than
3000%
mechanical
strain
excellent
resistance,
which
attributed
chemical
cross‐linking
multiple
hydroxyl
groups
glycerol
forming
rich
hydrogen
bonds
water
polymer
chains.
used
for
real‐time
breathing
sleep
processes.
This
work
provides
new
strategy
preparing
high‐performance,
extensibility,
stability
hydrogel‐based
monitoring.
Nano-Micro Letters,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: June 7, 2023
Human
metabolite
moisture
detection
is
important
in
health
monitoring
and
non-invasive
diagnosis.
However,
ultra-sensitive
quantitative
extraction
of
respiration
information
real-time
remains
a
great
challenge.
Herein,
chemiresistors
based
on
imine-linked
covalent
organic
framework
(COF)
films
with
dual-active
sites
are
fabricated
to
address
this
issue,
which
demonstrates
an
amplified
humidity-sensing
signal
performance.
By
regulation
monomers
functional
groups,
these
COF
can
be
pre-engineered
achieve
high
response,
wide
range,
fast
recovery
time.
Under
the
condition
relative
humidity
ranging
from
13
98%,
COFTAPB-DHTA
film-based
sensor
exhibits
outstanding
sensing
performance
expanded
response
value
390
times.
Furthermore,
values
highly
linear
range
below
60%,
reflecting
mechanism
at
molecular
level.
Based
dual-site
adsorption
(-C=N-)
(C-N)
stretching
vibrations,
reversible
tautomerism
induced
by
hydrogen
bonding
water
molecules
demonstrated
main
intrinsic
for
effective
detection.
In
addition,
synthesized
further
exploited
effectively
detect
human
nasal
oral
breathing
as
well
fabric
permeability,
will
inspire
novel
designs
humidity-detection
devices.
