Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 11, 2024
Abstract
Water
competitive
adsorption
and
limited
reaction
sites
on
the
micro‐scale
sensing
area
of
micro‐electro‐mechanical
system
(MEMS)
sensors
are
two
bottleneck
problems
that
restrict
detection
trace
indoor
polluted
gases,
leading
to
drifting
weak
signals.
To
address
this,
a
“duet‐insurance”
strategy
is
proposed
protect
amplify
signal.
For
first‐level
protection,
well‐designed
double‐layer
structure
consisting
Janus
TpMa
covalent
organic
framework
(COF)/Eu‐doped
α‐Fe
2
O
3
can
resist
diffusion
water
molecules
facilitate
electron
transfer
from
formaldehyde
(CH
O)
layers,
benefiting
outer
hydrophobic
character
strong
CH
capacity
Eu‐doped
Fe
.
second‐level
amplification,
unique
variable
temperature
excitation
facilitates
deep
penetration
into
active
across
COF
enabling
signal
amplification
through
thermally
actuated
carrier
modulation.
The
sensor
demonstrates
high
ability
O,
with
an
ultra‐low
limit
794
ppt.
Leveraging
novel
strategy,
multi‐functional,
visual
designed
identify
multi‐indoor
pollution
gases
by
feature
encoding
color
mapping,
showcasing
promising
potential
for
MEMS
based
COF/Eu‐doped
materials.
ACS Sensors,
Journal Year:
2024,
Volume and Issue:
9(4), P. 2101 - 2109
Published: April 4, 2024
Single-atom
catalysts
(SACs)
hold
great
promise
in
highly
sensitive
and
selective
gas
sensors
due
to
their
ultrahigh
atomic
efficiency
excellent
catalytic
activity.
However,
the
extremely
high
surface
energy
of
SACs,
it
is
still
a
huge
challenge
synthesize
stable
single-atom
metal
on
materials.
Here,
we
report
an
layer
deposition
(ALD)
strategy
for
elaborate
synthesis
Pt
oxygen
vacancy-rich
Fe2O3
nanosheets
(Pt–Fe2O3–Vo),
which
displayed
ultrafast
detection
H2,
achieving
stability
single
atoms.
Gas-sensing
investigation
showed
that
Pt–Fe2O3–Vo
materials
enabled
significantly
enhanced
response
26.5–50
ppm
was
17-fold
higher
than
pure
Fe2O3,
as
well
time
(2
s),
low
limit
(86
ppb),
improved
stability.
The
experimental
density
functional
theory
(DFT)
studies
revealed
abundant
vacancy
sites
contributed
stabilizing
atoms
via
electron
transfer.
In
addition,
stabilized
also
greatly
promote
transfer
H2
molecules
thereby
sensing
performance.
This
work
provides
potential
development
chemical
sensors.
Nano-Micro Letters,
Journal Year:
2025,
Volume and Issue:
17(1)
Published: Jan. 24, 2025
Abstract
The
integration
of
dual-mesoporous
structures,
the
construction
heterojunctions,
and
incorporation
highly
concentrated
oxygen
vacancies
are
pivotal
for
advancing
metal
oxide-based
gas
sensors.
Nonetheless,
achieving
an
optimal
design
that
simultaneously
combines
mesoporous
precise
heterojunction
modulation,
controlled
through
a
one-step
process
remains
challenging.
This
study
proposes
innovative
method
fabricating
zinc
stannate
semiconductors
featuring
structures
tunable
via
direct
solution
precursor
plasma
spray
technique.
As
proof
concept,
resulting
stannate-based
coatings
applied
to
detect
2-undecanone,
key
biomarker
rice
aging.
Remarkably,
oxide/zinc
heterojunctions
with
well-defined
secondary
pore
structure
exhibit
exceptional
gas-sensing
performance
2-undecanone
at
room
temperature.
Furthermore,
practical
experiments
indicate
developed
sensor
effectively
identifies
adulteration
in
various
varieties.
These
results
underscore
potential
this
designing
oxides
tailored
properties
high-performance
enhanced
adsorption
capacity
features
semiconductor
make
it
promising
candidate
sensing
applications
agricultural
food
safety
inspections.
Materials,
Journal Year:
2025,
Volume and Issue:
18(2), P. 451 - 451
Published: Jan. 19, 2025
Hydrogen
has
emerged
as
a
prominent
candidate
for
future
energy
sources,
garnering
considerable
attention.
Given
its
explosive
nature,
the
efficient
detection
of
hydrogen
(H2)
in
environment
using
H2
sensors
is
paramount.
Chemoresistive
sensors,
particularly
those
based
on
noble-metal-decorated
metal
oxide
semiconductors
(MOSs),
have
been
extensively
researched
owing
to
their
high
responsiveness,
low
limits,
and
other
favorable
characteristics.
Despite
numerous
recent
studies
reviews
reporting
advancements
this
field,
comprehensive
review
focusing
rational
design
sensing
materials
enhance
overall
performance
chemoresistive
MOFs
lacking.
This
aims
address
gap
by
examining
principles,
applications,
challenges
with
specific
focus
Pd-decorated
Pt-decorated
MOSs-based
materials.
The
observations
explanations
strategies
employed
literature,
within
last
three
years,
analyzed
provide
insights
into
latest
research
directions
developments
domain.
understanding
essential
designing
fabricating
highly
sensors.
Small Structures,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 26, 2025
In
this
study,
a
flexible
room‐temperature
ammonia
(NH
3
)
sensor
is
developed
based
on
MoO
/CuO/Cu
2
O
hybrid
nanoclusters
(HNCs),
specifically
designed
for
the
noninvasive
diagnosis
of
nephropathy.
The
HNCs
achieve
an
ultralow
detection
limit
0.73
ppm,
with
high
sensitivity
(0.163
ppm
−1
and
rapid
response
recovery
times
(16.4
90.6
s).
integration
(n‐type)
CuO
Cu
(p‐type)
forms
multi‐heterojunctions,
enhancing
gas‐sensing
performance
through
efficient
charge
separation
improved
NH
adsorption.
Additionally,
demonstrates
excellent
mechanical
flexibility
long‐term
stability
under
dynamic
deformation.
To
address
humidity
interference
in
exhaled
breath
analysis,
hydrophobic
polytetrafluoroethylene
layer
coated
via
radio
frequency
sputtering,
ensuring
effective
differentiation
between
healthy
individuals
kidney
disease
patients.
work,
potential
multi‐heterojunction
nanostructures
developing
high‐performance,
gas
sensors
practical
health‐monitoring
applications
highlighted.
