ACS Sensors,
Год журнала:
2024,
Номер
9(1), С. 149 - 156
Опубликована: Янв. 5, 2024
Investigating
the
sensing
mechanisms
in
semiconducting
metal
oxide
(SMOx)
gas
sensors
is
essential
for
optimizing
their
performance
across
a
wide
range
of
potential
applications.
Despite
significant
progress
field,
there
are
still
many
gaps
comprehending
phenomenological
processes
occurring
one-dimensional
(1D)
nanostructures.
This
article
presents
first
insights
into
conduction
mechanism
chemoresistive
based
on
single-crystalline
Sn3O4
nanobelts
using
operando
Kelvin
Probe
technique.
From
this
approach,
direct
current
(DC)
electrical
resistance
and
work
function
changes
were
simultaneously
measured
different
working
conditions,
correlation
between
conductance
surface
band
bending
was
established.
Appropriate
modeling
proposed,
results
revealed
that
nanostructures
closely
aligns
with
behavior
observed
epitaxial
layers
rather
than
polycrystalline
grains.
Based
assumption,
relevant
parameters
further
estimated,
including
Debye
length,
concentration
free
charge
carriers,
effective
density
states
band,
position
Fermi
level.
Overall,
study
provides
an
contribution
to
understanding
role
chemistry
transduction
signal
generated
from
adsorption
Scientific Reports,
Год журнала:
2024,
Номер
14(1)
Опубликована: Март 5, 2024
Abstract
Activated
carbon
(AC)
and
ZnO@AC
composite
derived
from
wood
sawdust
were
prepared
to
be
utilized
as
adsorbents
for
methyl
red
(MR)
orange
(MO)
anionic
dyes
the
aqueous
solutions.
The
maximum
adsorption
capacity
of
AC
toward
both
was
achieved
in
strong
acidic
medium
(pH
=
3),
under
stirring
60
min.
kinetic
studies
revealed
that
MR
MO
onto
fitted
well
with
pseudo-second-order
model.
Furthermore,
intraparticle
diffusion
Elovich
models
confirmed
is
controlled
by
external
surfaces,
chemisorption
process.
isotherm
results
indicated
dye
occurred
via
monolayer
adsorption,
estimated
capacities
higher
than
those
AC.
Thermodynamic
analysis
suggested
endothermic
spontaneous.
mechanism
MR,
proposed
electrostatic
bonding,
π–π
interactions,
ion
exchange,
while
H-bonding
n–π
interactions
minor
contributors.
This
study
reveals
potential
use
carbon-based
removal
wastewater.
ACS Applied Nano Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Operating
gas
sensors
at
different
temperatures
is
a
common
approach
to
improve
selectivity,
but
it
often
compromises
long-term
stability
and
hinders
real-time
detection.
In
this
study,
we
introduce
photochemically
activated
p-type
CuCrO2
nanostructured
thin
films,
which
generate
distinct
optical
fingerprints
under
UV
light
intensities,
enabling
identification.
The
hexagonal-like
nanostructure
of
the
film
increases
surface
area,
significantly
enhancing
sensor's
sensitivity
selectivity.
sensor
demonstrated
response
approximately
∼3.6
for
various
concentrations
N-propanol,
NO2,
NH3,
ethanol,
methanol,
formaldehyde
20
mW/cm2
illumination,
with
times
ranging
from
50
200
s.
By
applying
machine
learning
techniques,
achieved
classification
accuracy
exceeding
90%.
Furthermore,
regression
analysis
enhanced
predictive
concentrations,
R2
values
above
0.9.
also
exhibited
excellent
stability,
only
7.4%
degradation
over
90
days
consistent
performance
varying
humidity.
This
work
introduces
strategy
address
selectivity
challenges,
making
these
suitable
environmental
monitoring
industrial
safety
applications.
Journal of Materials Chemistry C,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
In
this
article,
we
summarize
the
progress
of
materials,
mechanisms
and
ML-assisted
gas
sensing
data
processing
for
MOS
sensor
arrays,
with
a
view
to
providing
breakthrough
direction
future
research.
