Metasurface
analogues
of
Electromagnetically
Induced
Transparency
(EIT)
can
achieve
high
quality
factor
(Q
factor)
resonance
transmission
peaks,
making
them
suitable
for
sensing
applications
including
refractive
index
and
gas
detection.
We
propose
a
displacement-driven
symmetry-breaking
EIT
metasurface
operating
in
the
mid-wave
infrared
range,
which
consists
tri-atom
germanium
nano
brick
array.
By
geometrically
introducing
displacement
to
central
atom,
an
window
be
generated.
Ten
metasurfaces
were
designed
with
peak
wavelengths
regularly
distributed
between
3.3
3.4
μm
at
intervals
20
nm
so
as
target
important
methane
absorption
resonance.
The
characteristics
studied
using
Rigorous
Coupled-Wave
Analysis
(RCWA)
simulations.
origin
contribution
toroidal
dipole
effect
was
explained
through
Finite-Difference
Time-Domain
(FDTD)
simulation.
Successful
fabrication
precisely
defined
Ge
bricks
electron
beam
lithography
reactive
ion
etching
achieved.
Q-factors
greater
than
100
experimentally
obtained
resonant
full-width-at-half-maxima
less
30
nm.
In
this
work,
a
low-temperature
formaldehyde
sensor
based
on
hydrothermally
synthesized
tin
dioxide/tin
selenide
(SnO2/SnSe2)
nanostructure
was
demonstrated.
The
SnO2
nanosheets
were
decorated
the
SnSe2
nanoblocks.
microstructural
characterization
proves
unique
morphology.
At
150
°C,
SnO2/SnSe2
composite
gas
exhibits
more
than
three
times
response
to
compared
pure
SnO2,
with
of
13.47
10
ppm
and
recovery
time
63
s/12
s.
addition,
is
capable
detecting
at
ppb
level.
also
excellent
repeatability,
long-term
performance
stability,
resistance
humidity
interference.
n–n
heterojunction
formed
between
SnSe2,
along
its
microstructure,
significantly
enhances
sensor.
adsorption
behavior
molecules
sensitive
material
surfaces
studied
by
using
density
functional
theory.
ACS Sensors,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 12, 2025
Electronic
noses
have
been
widely
used
in
industrial
production,
food
preservation,
agricultural
product
storage,
environmental
monitoring,
and
other
fields.
However,
due
to
the
cross-sensitivity
of
gas-sensing
responses,
accurately
measuring
concentration
mixed
gases
remains
challenging.
To
address
this
issue,
study
attempts
determine
number
state
variables
that
produce
cross-influence
based
on
experimental
data,
establish
space
model
from
equivalent
circuit
model,
obtain
parameters
through
parameter
correlation
iterative
algorithms
a
Kalman
filter.
The
sensor
response
measurement
are
established
accordingly.
simulation
results
show
these
two
models
high
accuracy
predicting
concentrations
under
influence
sensors.
ACS Applied Electronic Materials,
Journal Year:
2024,
Volume and Issue:
6(4), P. 2639 - 2648
Published: April 3, 2024
Methane
is
one
of
the
primary
components
natural
gas
and
also
principal
constituent
coal
mine
gas.
In
order
to
construct
a
high-performance
methane
sensor,
Ti3C2Tx
MXene
nanosheets
CeO2
nanospheres
were
prepared
by
etching
hydrothermal
methods
as
sensing
materials.
The
detection
ability
Ti3C2Tx/CeO2
composite
was
compared
with
that
single
sensor
toward
sensing.
performance
greatly
enhanced
showed
better
sensitivity
higher
humidity
resistance
than
sensor.
According
characterization
experimental
results,
property
enhancement
significantly
due
modification
CeO2,
high
carrier
mobility
Ti3C2Tx,
synergistic
effect
combination
two
nanomaterials.
Based
on
valve
state
system
constructed
achieved
real-time
monitoring
leakage
from
safety
valves
during
transportation
process
runtime
estimation
for
Sensors and Actuators Reports,
Journal Year:
2024,
Volume and Issue:
8, P. 100216 - 100216
Published: June 28, 2024
The
presence
of
ammonia
in
exhaled
human
breath
serves
as
a
crucial
biomarker
for
renal
diseases.
This
paper
presents
highly
sensitive
sensor
operable
at
room
temperature,
utilizing
Ti/Zr
dual
metal
MOF
its
core
component,
synthesized
through
straightforward
solvothermal
reaction
approach.
Ti/Zr-MOF
demonstrates
excellent
responsiveness
to
gas,
with
detection
limit
remarkable
sensitivity,
reaching
low
2
ppm.
Notably,
the
exhibits
practical
insensitivity
similar
concentrations
other
major
interfering
volatiles,
including
acetone,
ethanol,
and
saturated
moisture.
Electron
Paramagnetic
Resonance
(EPR)
analysis
confirms
oxygen
vacancies
(Ov)
materials,
exhibiting
stronger
Ov
signals
potential
enhanced
NH3
adsorption
capture.
In-situ
FTIR
spectrum
reveals
ammonia-induced
-OH
(H2O)
moiety
formation,
indicating
between
adsorbed
O2−
species
ammonia,
resulting
decreased
electrical
resistance
Ti/Zr-MOF.
ACS Omega,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 16, 2025
Monitoring
ultralow
nitrogen
dioxide
(NO2)
concentrations
is
crucial
for
air
quality
management
and
public
health.
However,
the
existing
NO2
gas
sensors
have
several
defects,
like
high
cost
power
consumption,
exhibit
poor
selectivity.
This
study
addresses
these
challenges
by
presenting
a
novel
hexadecafluorinated
iron
phthalocyanine-reduced
graphene
oxide
(FePcF16-rGO)
covalent
hybrid
sensor
detection.
innovative
approach,
which
overcomes
limitations
of
fabrication
cost,
energy
efficiency,
selectivity,
significant
step
forward
in
technology.
The
demonstrates
exceptional
sensitivity
toward
(15.14%
response
100
ppb)
with
rapid
60
s
UV
light-induced
recovery.
Additionally,
exhibits
selectivity
NO2,
achieving
limit
detection
(LOD)
8.59
ppb.
approach
paves
way
developing
cost-effective,
energy-efficient,
miniature
monitoring
devices
improved
environmental
enhanced
safety
workplaces
where
exposure
concern.
