Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(18)
Published: Jan. 3, 2024
Wearable
humidity
sensors
are
attracting
strong
attention
as
they
allow
for
real-time
and
continuous
monitoring
of
important
physiological
information
by
enabling
activity
tracking
well
air
quality
assessment.
Amongst
2Dimensional
(2D)
materials,
graphene
oxide
(GO)
is
very
attractive
sensing
due
to
its
tuneable
surface
chemistry,
high
area,
processability
in
water,
easy
integration
onto
flexible
substrates.
However,
hysteresis,
low
sensitivity,
cross-sensitivity
issues
limit
the
use
GO
practical
applications,
where
preferred.
Herein,
a
wearable
wireless
impedance-based
sensor
made
with
pyrene-functionalized
hexagonal
boron
nitride
(h-BN)
nanosheets
demonstrated.
The
device
shows
enhanced
sensitivity
towards
relative
(RH)
(>10
Nano-Micro Letters,
Journal Year:
2022,
Volume and Issue:
14(1)
Published: July 22, 2022
In
the
past
decade,
global
industry
and
research
attentions
on
intelligent
skin-like
electronics
have
boosted
their
applications
in
diverse
fields
including
human
healthcare,
Internet
of
Things,
human-machine
interfaces,
artificial
intelligence
soft
robotics.
Among
them,
flexible
humidity
sensors
play
a
vital
role
noncontact
measurements
relying
unique
property
rapid
response
to
change.
This
work
presents
an
overview
recent
advances
using
various
active
functional
materials
for
contactless
monitoring.
Four
categories
are
highlighted
based
resistive,
capacitive,
impedance-type
voltage-type
working
mechanisms.
Furthermore,
typical
strategies
chemical
doping,
structural
design
Joule
heating
introduced
enhance
performance
sensors.
Drawing
perception
capability,
human/plant
healthcare
management,
interactions
as
well
integrated
sensor-based
feedback
systems
presented.
The
burgeoning
innovations
this
field
will
benefit
society,
especially
during
COVID-19
epidemic,
where
cross-infection
should
be
averted
sensation
is
highly
desired.
Sensors and Actuators B Chemical,
Journal Year:
2022,
Volume and Issue:
374, P. 132731 - 132731
Published: Sept. 23, 2022
Humidity
sensing
is
crucial
for
several
industrial,
environmental,
and
healthcare
applications,
many
of
which
require
sensors
in
flexible
form
factors
with
features
such
as
disposability
facile
fabrication
processes.
Herein,
we
present
a
flexible,
cost-effective,
disposable
humidity
sensor
developed
on
paper
substrate.
The
screen-printed
graphene-carbon
(G-C)
ink-based
demonstrates
good
performance
terms
change
resistance
(∼12.4
Ω/%RH)
ranging
from
25%RH
to
91.7%RH.
displays
high
flexibility
(studied
at
bending
radiuses
40
mm,
30
25
20
mm),
appreciable
stability
(>
4
months),
repeatability
100
cycles),
short
response/recovery
time
(∼4
s/∼6
s
towards
respiration
rate
monitoring)
reproducibility
(minor
variations
∼
±
1
Ω/%RH).
efficacy
fabricated
evaluated
spatial
monitoring,
soil
moisture
monitoring.
Finally,
the
real
monitoring
also
demonstrated
via
wireless
transmission
data
smartphone
display
potential
agricultural,
applications.
ACS Nano,
Journal Year:
2023,
Volume and Issue:
17(6), P. 5588 - 5599
Published: Feb. 6, 2023
Monitoring
sweat
rate
is
vital
for
estimating
loss
and
accurately
measuring
biomarkers
of
interest.
Although
various
optical
or
electrical
sensors
have
been
developed
to
monitor
the
sensible
rate,
quantification
insensible
that
directly
related
body
thermoregulation
skin
barrier
functions
still
remains
a
challenge.
This
work
introduces
superhydrophobic
sensor
based
on
polyacrylate
sodium/MXene
composite
sandwiched
between
two
textile
layers
continuously
measure
vapor
from
with
high
sensitivity
rapid
response.
The
holey
thin
substrate
reduced
stiffness
excellent
breathability
allows
permeation
vapor,
while
preventing
being
affected
by
external
water
droplets
internal
sweat.
Integrating
flexible
wireless
communication
powering
module
further
yields
standalone
sensing
system
rates
at
different
locations
diverse
application
scenarios.
Proof-of-concept
demonstrations
human
subjects
showcase
feasibility
evaluate
body's
assessment
thermal
comfort,
disease
conditions,
nervous
activity.
results
presented
in
this
also
provide
low-cost
device
platform
detect
other
health-relevant
(vapor)
as
next-generation
smart
healthcare
personalized
medicine.
