Nanoscale Advances,
Journal Year:
2022,
Volume and Issue:
4(3), P. 824 - 836
Published: Jan. 1, 2022
Formaldehyde
is
a
common
carcinogen
in
daily
life
and
harmful
to
health.
The
detection
of
formaldehyde
by
metal
oxide
semiconductor
gas
sensor
an
important
research
direction.
In
this
work,
cobalt-doped
SnO2
nanoparticles
(Co-SnO2
NPs)
with
typical
zero-dimensional
structure
were
synthesized
simple
hydrothermal
method.
At
the
optimal
temperature,
selectivity
response
0.5%
Co-doped
are
excellent
(for
30
ppm
formaldehyde,
Ra/Rg
=
163
437).
Furthermore,
actual
minimum
detectable
concentration
0.5%Co-SnO2
NPs
as
low
40
ppb,
which
exceeds
requirements
for
World
Health
Organization
(WHO)
guidelines.
significant
improvement
performance
can
be
attributed
following
aspects:
firstly,
cobalt
doping
effectively
improves
resistance
air;
moreover,
creates
more
defects
oxygen
vacancies,
conducive
adsorption
desorption
gases.
addition,
crystal
size
vastly
small
has
unique
physical
chemical
properties
materials.
same
time,
compared
other
gases
tested,
strong
reducibility,
so
that
it
selectively
detected
at
lower
temperature.
ACS Sensors,
Journal Year:
2022,
Volume and Issue:
7(5), P. 1484 - 1494
Published: April 28, 2022
Low-cost
and
real-time
formaldehyde
(HCHO)
monitoring
is
of
great
importance
due
to
its
volatility,
extreme
toxicity,
ready
accessibility.
In
this
work,
a
low-cost
integrated
microelectromechanical
system
(MEMS)
HCHO
sensor
developed
based
on
SnO2
multishell
hollow
microspheres
loaded
with
bimetallic
PdPt
(PdPt/SnO2-M)
sensitizer.
The
MEMS
exhibits
high
sensitivity
((Ra/Rg
–
1)
%
=
83.7
@
1
ppm),
ultralow
detection
limit
50
ppb,
ultrashort
response/recovery
time
(5.0/7.0
s
ppm).
These
excellent
sensing
properties
are
attributed
unique
structure
large
accessible
surface,
abundant
interfaces,
suitable
mesoporous
structure,
synergistic
catalytic
effects
bimetal
PdPt.
well-defined
also
shows
fascinating
capacities
as
good
hosts
for
noble
metal
loading.
Therefore,
nanoparticles
can
be
employed
construct
sensitizer
content
dispersity
further
exhibiting
reduced
working
temperature
ultrasensitive
HCHO.
This
PdPt/SnO2-M-based
presents
highly
sensitive
means
detect
HCHO,
establishing
promise
potential
application
in
environmental
monitoring.
ACS Applied Materials & Interfaces,
Journal Year:
2021,
Volume and Issue:
13(48), P. 57597 - 57608
Published: Nov. 24, 2021
In
this
work,
we
present
a
new
metal
oxide
semiconductor
gas
sensor
for
detecting
trimethylamine
(TMA)
by
bimetal
Au@Pt-modified
α-Fe2O3
hollow
nanocubes
(NCs)
as
sensing
materials.
The
structure
and
morphological
characteristics
of
Au@Pt/α-Fe2O3
were
evaluated
through
multiple
analyses,
their
gas-sensitive
performance
was
investigated.
Compared
with
the
pristine
NC
sensor,
based
on
NCs
exhibited
faster
response
time
(5
s)
higher
(Ra/Rg
=
32)
toward
100
ppm
TMA
at
lower
temperature
(150
°C).
Furthermore,
also
assessed
freshness
Larimichthys
crocea
which
have
been
observed
headspace
solid-phase
microextraction
chromatography-mass
spectrometry.
high
is
attributed
to
special
morphology
specific
surface
area
(212.9
m2/g)
synergistic
effect
Au@Pt
bimetal.
shows
promising
application
prospects
in
estimating
seafood
spot.
ACS Sensors,
Journal Year:
2022,
Volume and Issue:
7(8), P. 2178 - 2187
Published: July 28, 2022
As
the
most
widely
used
gas
sensors,
metal
oxide
semiconductor
(MOS)-based
chemiresistors
have
been
facing
great
challenges
in
achieving
ppb-level
and
selective
detection
of
target
gas.
The
rational
design
employment
bimetallic
nanocatalysts
(NCs)
are
expected
to
address
this
issue.
In
work,
well-shaped
monodispersed
AuPt
NCs
(diameter
≈
9
nm)
were
functionalized
on
one-dimensional
(1D)
In2O3
nanofibers
(NFs)
construct
efficient
sensors.
sensor
demonstrated
dual-selective
for
ozone
(O3)
acetone
(C3H6O)
at
different
optimal
working
temperatures.
For
possible
application
exploitation,
a
circuit
was
designed
monitor
O3
concentration
provide
warnings
when
safety
limit
(50
ppb)
exceeded.
Moreover,
simulated
exhaled
breath
measurements
also
carried
out
diagnose
diabetes
through
C3H6O
concentration.
further
analyzed
by
principal
component
analysis
(PCA).
drastically
enhanced
sensing
performances
attributed
synergistic
catalytic
effect
NCs.
Both
"spillover
effect"
Schottky
barrier
interfaces
NFs
promoted
processes
C3H6O.
Nanoscale Advances,
Journal Year:
2022,
Volume and Issue:
4(3), P. 824 - 836
Published: Jan. 1, 2022
Formaldehyde
is
a
common
carcinogen
in
daily
life
and
harmful
to
health.
The
detection
of
formaldehyde
by
metal
oxide
semiconductor
gas
sensor
an
important
research
direction.
In
this
work,
cobalt-doped
SnO2
nanoparticles
(Co-SnO2
NPs)
with
typical
zero-dimensional
structure
were
synthesized
simple
hydrothermal
method.
At
the
optimal
temperature,
selectivity
response
0.5%
Co-doped
are
excellent
(for
30
ppm
formaldehyde,
Ra/Rg
=
163
437).
Furthermore,
actual
minimum
detectable
concentration
0.5%Co-SnO2
NPs
as
low
40
ppb,
which
exceeds
requirements
for
World
Health
Organization
(WHO)
guidelines.
significant
improvement
performance
can
be
attributed
following
aspects:
firstly,
cobalt
doping
effectively
improves
resistance
air;
moreover,
creates
more
defects
oxygen
vacancies,
conducive
adsorption
desorption
gases.
addition,
crystal
size
vastly
small
has
unique
physical
chemical
properties
materials.
same
time,
compared
other
gases
tested,
strong
reducibility,
so
that
it
selectively
detected
at
lower
temperature.
