Advanced Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 28, 2024
Abstract
This
study
presents
an
acetylene
gas
sensor
capable
of
in
situ
monitoring
transformer
oils.
utilizes
carbon
nanotubes
(CNTs)
embedded
polyimide
(PI)
synthesized
by
floating
catalyst
chemical
vapor
deposition.
Unlike
conventional
sensors
that
target
hydrocarbon
gases
dissolved
oil
and
measure
the
extracted
from
oil,
proposed
CNT‐PI
detects
within
real
time.
The
PI
embedding
technique
effectively
anchors
shields
CNT
network
against
fluidic
damage,
ensuring
stable
sensing
performance
over
6
months,
even
under
friction
stress
caused
convection.
Decorating
CNTs
with
gold
nanoparticles
further
enhances
sensitivity
response
sensor.
achieves
a
high
(10.5%
at
30
ppm)
fast
response/recovery
times
(28
s/77
s),
Furthermore,
demonstrates
good
(10.4%
moderate
(444
s/670
s)
medium,
which
qualifies
for
industrial
applications.
Additionally,
CNT‐PI‐based
heater
is
integrated
into
as
multilayer
component,
maintaining
optimal
operating
temperature
90
°C.
consistent
gas‐sensing
after
10,000
bending
cycles
exhibits
superior
characteristics,
indicating
its
compatibility
various
forms
transformers.
Abstract
Metal
oxide
semiconductors
(MOSs)
have
emerged
as
pivotal
materials
for
gas
sensing
technologies
due
to
their
inherent
advantages,
including
cost‐effectiveness,
simplicity
in
synthesis,
and
easy
fabrication
of
nanodevices.
These
characteristics
made
MOSs
widely
applicable
industrial,
environmental,
biological
monitoring.
While
offer
intrinsic
gas‐sensing
properties,
limited
active
site
density
function
diversity
restrict
sensitivity
selectivity,
especially
complex
gaseous
environments.
To
overcome
these
limitations,
extensive
research
efforts
been
devoted
functionalizing
through
strategies
such
heterojunction
construction,
noble
metal
nanoparticle
loading
(e.g.,
Au,
Pt,
Ag,
Pd),
heteroatom
doping
Si,
Cr).
Furthermore,
composite
an
effective
approach
enhance
MOSs‐based
sensors
by
integrating
carbon‐based
or
polymers
leverage
synergistic
interactions.
modifications
expand
the
applicability
detecting
volatile
organic
compounds,
toxic
gases,
flammable
gases.
This
review
systematically
examines
synthesis
performance
enhancements
achieved
functionalization
material
integration,
emphasizing
structure‐property
relationships,
interfacial
charge
transfer
dynamics,
adsorption
mechanisms.
Finally,
challenges
future
directions
rational
design
next‐generation
are
outlined,
providing
critical
insights
advancing
intelligent
technologies.
ACS Applied Electronic Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Авг. 12, 2024
In
this
paper,
mace-like
In2O3@ZnO
microtubes
were
obtained
from
MIL-68/ZIF-8
as
a
precursor
via
simple
hydrothermal
and
template
method.
The
resulting
microtubules
characterized
analyzed
by
series
of
methods
(XPS,
SEM,
TEM,
XRD).
Compared
to
pure
In2O3
microtubes,
the
In-2Zn
(In2O3:ZnO
2:1)
sensor
was
found
have
higher
response
(6.67)
10,000
ppm
H2
at
room
temperature
(25
°C)
faster
response/recovery
time
(178/338
s).
improvement
hydrogen
sensing
performance
mainly
attributed
porous
structure
composite
large
specific
surface
area
due
abundant
nanowires
grown
on
microbars.
Besides,
formation
an
n-n
heterojunction
interface
ZnO
also
important
factor
for
improvement.
property
indicated
that
nanocomposite
promising
detection
temperature.
ACS Applied Nano Materials,
Год журнала:
2024,
Номер
7(20), С. 24082 - 24092
Опубликована: Окт. 10, 2024
Bimetallic
nanocrystals
typically
exhibit
excellent
catalytic
properties,
surpassing
the
combination
of
two
single
metal
due
to
synergistic
effect
bimetal.
This
study
aims
improve
response
and
selectivity
reduce
power
consumption
ZnO
sensor
simultaneously
through
bimetallic
nanocrystal
modification.
Pd,
Ag,
PdAg
with
a
size
3
nm
were
successfully
prepared
then
uniformly
assembled
on
surface
nanorods
prepare
Pd/ZnO,
Ag/ZnO,
PdAg/ZnO
composites,
respectively.
The
exhibits
ultrahigh
(10212)
selectivity,
short
time
(3
s),
long-term
stability
20
ppm
TEA
at
250
°C,
actual
detection
limit
as
low
10
ppb.
Compared
ZnO,
not
only
reduces
operating
temperature
by
50
°C
but
also
significantly
improves
selectivity.
should
be
attributed
strong
dissociation
oxygen
formation
Schottky
barrier
between
ZnO.
may
ascribed
for
oxidation
TEA.
provides
an
effective
strategy
comprehensively
MOS-based
sensors.
