Real-time
monitoring
of
toxic
gases
can
be
performed
by
metal
oxide
semiconductor-based
chemo-resistive
gas
sensors
due
to
their
simple
structures,
low
cost,
and
faster
better
recovery
response.
Due
the
effective
electron-hole
separation,
tuning
formation
phase
junctions
is
an
efficient
method
for
improving
sensing
properties.
In
this
study,
two
distinct
hydrothermal
methods
were
used
synthesize
h-/m-WO3
hetero-nanoflowers.
first
method,
L-Cysteine
was
facilitate
between
h-WO3
m-WO3
nanostructures,
whereas
Thiourea
in
second.
Various
characterisation
approaches
validated
hexagonal-monoclinic
junction
development
nanoflowers.
The
material
fabricated
using
with
a
concentration
0.01M
than
other
sensors.
At
350°C,
selected
sample
displayed
outstanding
ammonia
capacity
experimental
detection
limit
1
ppm
(response=3.33).
theoretical
determined
27
ppb.
selectivity
sensor
towards
NH3
over
H2S
acetone
increased
combining
devices
double
filtration
setup.
Chemosensors,
Journal Year:
2024,
Volume and Issue:
12(3), P. 43 - 43
Published: March 5, 2024
The
NH3
sensor
is
of
great
significance
in
preventing
leakage
and
ensuring
life
safety.
In
this
work,
the
Pd-decorated
ZnO
hexagonal
microdiscs
are
synthesized
using
hydrothermal
annealing
processes,
gas
fabricated
based
on
microdiscs.
gas-sensing
test
results
show
that
Pd-ZnO
has
a
good
response
to
gas.
Specifically,
it
linear
within
0.5–50
ppm
at
optimal
operating
temperature
230
°C.
addition,
exhibits
repeatability,
short
time
(23.2
s)
humidity
resistance
(10–90%
relative
humidity).
This
work
provides
useful
reference
for
developing
an
sensor.
ECS Sensors Plus,
Journal Year:
2024,
Volume and Issue:
3(1), P. 013401 - 013401
Published: Jan. 22, 2024
The
economic
growth
of
any
country
depends
upon
the
MSMEs
as
it
plays
a
vital
role
in
GDP
and
employment.
transportation
is
considered
lifeline
country.
Hence
due
to
developing
countries,
industries
vehicles
are
continuously
increasing
fulfil
industrial
or
domestic
requirements.
But
unfortunately,
emit
harmful
gases
exhaust
environment.
Which
directly
indirectly
impact
human
health.
Fresh
clean
air
prime
need
society.
monitoring
different
gas
concentrations
environment
very
essential
take
preventive
steps
control
pollution.
traditional
method
quality
expensive,
hence
most
countries
have
limited
stations.
In
field
nanotechnology,
scientists
developed
types
soft
metal
oxide
materials
that
capable
sensing
at
low
can
work
environmental
conditions.
For
last
10
years,
ferrite-based
sensors
primarily
used
detect
gases,
pollutants
from
vehicle
exhaust,
pollution
monitoring.
These
ferrites
excellent
electrical
magnetic
properties
also
be
tuned
according
requirement
sensor
increase
sensitivity
selectivity.
tuning
ferrite
synthesis
technique,
optimizing
preparation
conditions,
sintering
temperatures,
operating
dopant
concentration,
etc
This
paper
based
on
deep
study
techniques
nano-ferrites,
sensors,
mechanisms,
parameters,
application
chemo-resistive
sensors.
key
parameters
for
phase
formation,
crystallite
size,
grain
surface
area,
selectivity,
dopants,
sensitivity,
temperature,
response/recovery
time.
review
includes
researchers
find
high
like
hydrogen
(H
2
),
carbon
monoxide
(CO),
dioxide
(CO
oxygen
(O
ethylene
glycol
(CH2
mathvariant="italic">OH
stretchy="false">)
,
methane
(CH
4
ammonia
(NH
3
)
liquid
petroleum
(LPG),
acetylene
(C
H
nitrogen
oxides
(NOx)
selected
application.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Jan. 2, 2024
Abstract
Chitosan
(Chs)-salicylaldehyde
(Sal)
polymer
derivatives
were
formed
via
the
reaction
of
Chs-Sal
with
zinc
oxide
nanoparticles
(ZnO
NPs)
and
beta-cyclodextrin
(β-CD).
These
polymers
synthesized
through
inclusion
β-CD
doping
ZnO
NPs
to
give
pseudopolyrotaxane
Chs-Sal/ZnO
composite,
respectively,
for
low-temperature
detection
sensing
NH
3
vapors
as
great
significance
in
environmental
control
human
health.
Additionally,
(Chs-Sal/β-CD/ZnO
was
prepared
insertion
generated
composite
(Chs-Sal/ZnO
β-cyclodextrin
ring.
The
structural
morphological
characterizations
confirmed
by
utilizing
FTIR,
XRD
and,
SEM,
respectively.
Also,
optical
properties
thermal
gravimetric
analysis
(TGA)
explored.
obtained
results
that
using
or
modification
(Chs-Sal)
dramatically
enhanced
stability
features
polymers.
Investigations
on
-sensing
Chs-Sal/β-CD/ZnO
carried
out
at
concentrations
down
10
ppm
good
response
recovery
times
(650
s
350
s,
respectively)
room
temperature
(RT)
indicated
effectively
improves
from
712
6192
NPs,
low
LOD
LOQ
0.12
0.4
ppb,
Materials Horizons,
Journal Year:
2023,
Volume and Issue:
11(1), P. 184 - 195
Published: Oct. 31, 2023
2D
SnO
2
nanosheets
based
chemiresistive
sensor
with
microporosity
and
oxygen
rich-surface
detects
ammonia
at
room
temperature
in
extreme
humidity
ppb
levels
for
breath
early
disease
diagnostics
healthcare.
Nanotechnology,
Journal Year:
2023,
Volume and Issue:
34(20), P. 205501 - 205501
Published: Feb. 14, 2023
Herein,
we
report
a
Pt-decorated
Ti3C2Tx/TiO2gas
sensor
for
the
enhanced
NH3sensing
response
at
room
temperature.
Firstly,
TiO2nanosheets
(NSs)
arein
situgrown
onto
two-dimensional
(2D)
Ti3C2Txby
hydrothermal
treatment.
Similar
to
Ti3C2Txsensor,
Ti3C2Tx/TiO2sensor
has
positive
resistance
variation
upon
exposure
NH3,
but
with
slight
enhancement
in
response.
However,
after
loading
of
Pt
nanoparticles
(NPs),
Pt-Ti3C2Tx/TiO2sensor
shows
negative
significantly
improved
performance.
The
shift
direction
indicates
that
dominant
sensing
mechanism
changed
under
sensitization
effect
NPs.
At
temperature,
Pt-Ti3C2Tx/TiO2gas
100
ppm
NH3is
about
45.5%,
which
is
13.8-
and
10.8-
times
higher
than
those
Ti3C2Txand
sensors,
respectively.
experimental
detection
limit
detect
10
ppm,
corresponding
10.0%.
In
addition,
fast
response/recovery
speed
(23/34
s
NH3),
high
selectivity
good
stability.
Considering
both
value
direction,
gas-sensing
also
deeply
discussed.
This
work
expected
shed
new
light
on
development
noble
metals
decorated
MXene-metal
oxide
gas
sensors.
Nanomaterials,
Journal Year:
2025,
Volume and Issue:
15(2), P. 127 - 127
Published: Jan. 16, 2025
In
this
study,
square-star-shaped
leaf-like
BiVO4
nanomaterials
were
successfully
synthesized
using
a
conventional
hydrothermal
method.
The
microstructure,
elemental
composition,
and
gas-sensing
performance
of
the
materials
thoroughly
investigated.
Morphological
analysis
revealed
that
prepared
at
different
reaction
temperatures
exhibited
structures,
with
most
regular
dense
structures
formed
150
°C,
exhibiting
large
specific
surface
area
2.84
m2/g.
response
gas
sensors
to
target
gases
was
evaluated,
results
showed
sensor
strong
NH3.
At
optimal
operating
temperature
300
its
sensitivity
5
ppm
NH3
reached
13.3,
time
28
s
recovery
16
s.
Moreover,
excellent
repeatability
anti-interference
performance.
These
findings
indicate
holds
great
potential
in
environmental
monitoring
industrial
safety
detection,
offering
new
insights
for
development
high-performance
sensors.
