Sensors,
Год журнала:
2024,
Номер
24(6), С. 1851 - 1851
Опубликована: Март 14, 2024
Pseudohexagonal
Nb2O5
microcolumns
spanning
a
size
range
of
50
to
610
nm
were
synthesized
utilizing
cost-effective
hydrothermal
process
(maintained
at
180
°C
for
30
min),
followed
by
subsequent
calcination
step
500
3
h.
Raman
spectroscopy
analysis
unveiled
three
distinct
reflection
peaks
220.04
cm−1,
602.01
and
735.3
indicative
the
pseudohexagonal
crystal
lattice
Nb2O5.
The
HRTEM
characterization
confirmed
inter-lattice
distance
1.8
Å
110
plain
3.17
100
plain.
conductometry
sensors
fabricated
drop-casting
dispersion
microcolumns,
in
ethanol,
on
Pt
electrodes.
exhibited
excellent
selectivity
detecting
C2H5OH
(ΔG/G
=
2.51
10
ppm
C2H5OH)
when
compared
variety
tested
gases,
including
CO,
CO2,
NO2,
H2,
H2S,
C3H6O.
optimal
operating
temperature
this
selective
detection
was
determined
be
dry
air
environment.
Moreover,
demonstrated
exceptional
repeatability
over
course
testing
cycles
displayed
strong
humidity
resistance,
even
exposed
90%
relative
humidity.
This
resistance
gas
sensing
property
can
attributed
their
nanoporous
nature
elevated
temperature.
Journal of environmental chemical engineering,
Год журнала:
2024,
Номер
12(2), С. 112144 - 112144
Опубликована: Фев. 9, 2024
The
advancement
of
industry
and
the
hastening
urbanization
have
led
to
serious
problems
associated
with
emanation
various
harmful
lethal
gases,
which
are
a
threat
humankind.
Therefore,
fabrication
highly
sensitive
selective
sensors
for
monitoring
these
gases
is
desirable.
Due
its
stability,
sensitivity,
selectivity
in
general
environment,
indium
oxide
(In2O3)
has
attracted
considerable
attention
gas
sensing.
Thus,
current
review
discusses
latest
research
made
over
last
five
years
on
In2O3-based
sensors.
influence
environmental
pollutants,
such
as
VOCs,
NOX,
CO,
O3,
NH3,
SO2
environment
human
life
were
discussed.
Among
synthesis
methods,
hydrothermal
approach
been
most
used
preparation
based
In2O3.
drawbacks
challenges
linked
In2O3
(5)
years,
showed
that
functioning
at
higher
temperatures.
This
lack
commercialization
because
reliability
issues
long-term
stability
drift.
So
far,
noble
metals
doped-In2O3
shown
promising
advantages
room
temperature
operation,
could
be
useful
reaching
next
generation
intelligent
from
micro/nanomaterials
era
self-powered,
artificially
system
their
integration
smartphones.
Bluetooth
modules
can
make
it
feasible
wirelessly
monitor
concentration
different
without
need
an
external
power
source
transmit
information
via
smartphone.
would
further
suitable
wireless
signal
detection,
Internet
Things,
data
processing,
particularly
machine
learning,
aid
Chemosensors,
Год журнала:
2024,
Номер
12(4), С. 65 - 65
Опубликована: Апрель 16, 2024
This
study
synthesizes
Ni-doped
perovskite-structured
LaFeO3
composite
materials
via
a
one-step
hydrothermal
method,
characterizes
the
morphology
and
structure
of
materials,
tests
their
gas
sensing
performance.
The
test
results
show
that
compared
to
pure
material,
performance
material
is
improved
in
all
aspects.
Specifically,
LFO-Ni2%
exhibits
response
as
high
102
towards
100
ppm
triethylamine
at
190
°C,
along
with
better
selectivity
stability.
Furthermore,
mechanism
investigated.
On
one
hand,
doping
an
appropriate
proportion
Ni
can
lead
formation
more-complete
smaller-sized
microsphere
structures
pores.
beneficial
for
adsorption
oxygen
from
air
onto
surface,
well
diffusion
target
surface
thereby
enhancing
sensitivity
other
doped
enters
interior
crystal,
replacing
some
cations
LaFeO3,
increasing
concentration
charge
carriers
reducing
material’s
resistance.
sample
adsorb
more
oxygen,
promoting
reaction
between
adsorbed
gas,
improving
sample.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
unknown
Опубликована: Апрель 24, 2024
Gas
sensors
for
real-time
monitoring
of
low
HCHO
concentrations
have
promising
applications
in
the
field
health
protection
and
air
treatment,
this
work
reports
a
novel
resistive
gas
sensor
with
high
sensitivity
selectivity
to
HCHO.
The
MOF-derived
hollow
In2O3
was
mixed
ZIF-67(Co)
calcined
twice
obtain
Co3O4/In2O3
(hereafter
collectively
termed
MZO-6)
composite
enriched
oxygen
vacancies,
tests
such
as
XPS
EPR
proved
that
strong
interfacial
electronic
coupling
increased
vacancies.
gas-sensitive
test
results
show
MZO-6
abundant
vacancies
has
higher
response
value
(11,003)
10
ppm
achieves
fast
response/recovery
time
(11/181
s)
at
lower
operating
temperature
(140
°C).
material
significantly
enhances
reduces
interference
common
pollutant
gases
ethanol,
acetone,
xylene.
There
is
no
significant
fluctuation
resistance
values
30-day
long-term
stability
test,
good
stability.
synergistic
effect
heterostructure
altered
formaldehyde
adsorption
intermediate
pathway
reduced
reaction
activation
energy,
enhancing
responsiveness
material.
