ACS Applied Nano Materials,
Journal Year:
2023,
Volume and Issue:
6(20), P. 19327 - 19337
Published: Oct. 17, 2023
We
introduce
a
new
approach
for
the
fabrication
of
an
ultrasensitive
nitrogen
dioxide
(NO2)
gas
sensor
operating
at
room
temperature.
By
using
atomic
layer
deposition
(ALD),
Pt
nanoparticles
(NPs)
can
be
selectively
decorated
on
surface
defects
tungsten
disulfide
(WS2).
Our
study
demonstrated
that
defect-selectively
functionalized
sensors
with
NPs
only
high-surface-energy
sites,
such
as
dangling
bonds
and
grain
boundaries,
exhibit
greater
enhancement
in
sensitivity
than
nonselectively
sensors.
Additionally,
sensing
performances
WS2-based
were
enhanced
by
controlling
particle
size
varying
number
ALD
cycles.
Specifically,
response
Pt-functionalized
WS2
to
10
ppm
NO2
was
maximized
150
cycles
ALD,
resulting
remarkable
10-fold
increase
(∼850%)
compared
pristine
WS2,
almost
complete
recovery
(∼93.2%)
achieved
200
Furthermore,
even
very
low
concentration
level
100
ppb,
optimized
Pt/WS2
showed
excellent
detection
performance,
rate
47%.
Also,
it
exhibited
selectivity
device
stability.
defect-selective
functionalization
method
improving
essential
performance
is
expected
applied
wide
range
functional
materials,
including
Ru,
Pd,
SnO2,
ZnO.
This
exhibits
potential
practical
applications
human
health
environmental
monitoring.
ACS Omega,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 10, 2024
Many
different
industries,
including
the
pharmaceutical,
medical
engineering,
clinical
diagnostic,
public
safety,
and
food
monitoring
use
gas
sensors.
The
inherent
qualities
of
nanomaterials,
such
as
their
capacity
to
chemically
or
physically
adsorb
gas,
great
ratio
surface
volume
make
them
excellent
candidates
for
in
sensing
technology.
Additionally,
nanomaterial-based
sensors
have
selectivity,
reproducibility,
durability,
cost-effectiveness.
This
Review
article
offers
a
summary
research
on
sensor
devices
based
nanomaterials
various
sizes.
numerous
sensors,
manufacturing
procedures
mechanisms,
most
recent
advancements
are
all
covered
detail.
In
addition,
evaluations
comparisons
key
characteristics
systems
made
from
dimensional
were
done.
Advanced Sustainable Systems,
Journal Year:
2022,
Volume and Issue:
6(4)
Published: Feb. 20, 2022
Abstract
Gas
sensors
based
on
metal
oxides
have
attracted
wide
attention,
due
to
their
inherent
advantages
such
as
low
cost,
small
size,
fast
response,
and
easy
usage.
Recently,
much
effort
been
put
into
the
design
of
oxide‐based
sensing
materials
further
improve
performance
gas
sensors.
Among
them,
fabrication
hierarchical
has
become
most
attractive
strategy.
In
this
article,
authors
widely
review
last
decade
development
sensors,
in
which
several
representative
gases
including
formaldehyde,
acetone,
H
2
S,
amines,
water
are
chosen
analytes
discuss
depth.
The
application
fields
cover
indoor
air
quality
monitoring,
breath
analysis,
food
safety.
research
advances
for
each
is
summarized
from
perspective
excellent
terms
operating
temperature
detection
limit,
high
selectivity,
responses,
humidity
independent
responses.
Furthermore,
accepted
mechanism
used
technology
verify
these
mechanisms
both
included.
Finally,
outlook
challenges
future
investigations
also
discussed
perspectives
theory
practice.
Materials,
Journal Year:
2022,
Volume and Issue:
16(1), P. 263 - 263
Published: Dec. 27, 2022
Metal
oxide
semiconductor
gas
sensors
are
widely
used
to
detect
toxic
and
inflammable
gases
in
industrial
production
daily
life.
The
main
research
hotspot
this
field
is
the
synthesis
of
sensing
materials.
Previous
studies
have
shown
that
incorporating
two
or
more
metal
oxides
form
a
heterojunction
interface
can
exhibit
superior
performance
response
selectivity
compared
with
single
phase.
This
review
focuses
on
mainly
methods
mechanisms
heterostructures.
A
significant
number
heterostructures
different
morphologies
shapes
been
fabricated,
which
specific
toward
target
gas.
Among
these
methods,
hydrothermal
method
noteworthy
due
fabrication
diverse
structures,
such
as
nanorod-like,
nanoflower-like,
hollow
sphere
structures
enhanced
properties.
In
addition,
it
should
be
noted
combination
also
an
efficient
way
obtain
novel
morphologies.
Despite
advanced
semiconductors
nanotechnology
field,
there
still
some
new
issues
deserve
further
investigation,
long-term
chemical
stability
materials,
reproducibility
process,
homogeneous
gases.
Moreover,
mechanism
controversial.
It
clarified
so
integrate
laboratory
theory
practical
exploitation.
Sensors,
Journal Year:
2023,
Volume and Issue:
23(6), P. 3272 - 3272
Published: March 20, 2023
On-site
detection
of
chemical
warfare
agents
(CWAs)
can
be
performed
by
various
analytical
techniques.
Devices
using
well-established
techniques
such
as
ion
mobility
spectrometry,
flame
photometry,
infrared
and
Raman
spectroscopy
or
mass
spectrometry
(usually
combined
with
gas
chromatography)
are
quite
complex
expensive
to
purchase
operate.
For
this
reason,
other
solutions
based
on
well
suited
portable
devices
still
being
sought.
Analyzers
simple
semiconductor
sensors
may
a
potential
alternative
the
currently
used
CWA
field
detectors.
In
type,
conductivity
layer
changes
upon
interaction
analyte.
Metal
oxides
(both
in
form
polycrystalline
powders
nanostructures),
organic
semiconductors,
carbon
nanostructures,
silicon
composites
that
combination
these
materials
material.
The
selectivity
single
oxide
sensor
adjusted
specific
analytes
within
certain
limits
appropriate
material
sensitizers.
This
review
presents
current
state
knowledge
achievements
for
detection.
article
describes
principles
operation
sensors,
discusses
individual
present
scientific
literature
makes
critical
comparison
them.
prospects
development
practical
application
technique
analysis
also
discussed.
