The
presence
of
efficient
catalytic
active
sites
and
an
ample
supply
electrons
are
the
two
indispensable
factors
for
achieving
photocatalytic
nitrogen
fixation.
Herein,
Fe-doped
TiO2
S-scheme
anatase/rutile
homojunction
(F-T-A/R)
was
synthesized
as
a
brilliant
photocatalyst
fixation
from
N2
to
NH3
under
ambient
atmosphere.
optimized
F-T-A/R
(A/R
=
98:2,
Fe-2wt%)
exhibits
unprecedented
generation
rate
358
μmol
gcat-1
h-1
in
water
solvent
simulated
solar
light
irradiation.
Experimental
theoretical
studies
reveal
that
constructed
F-A/R-TiO2
is
conducive
fluent
charge
separation
adequate
on
rutile
with
higher
fixing
activity,
while
tuned
local
electronic
structure
oxygen
vacancy
Fe
doping
engineered
strengthen
sites,
synergistically
enhancing
Metal
oxide
gas
sensors
have
long
faced
the
challenge
of
low
response
and
poor
selectivity,
especially
at
room
temperature
(RT).
Herein,
a
synergistic
effect
electron
scattering
space
charge
transfer
is
proposed
to
comprehensively
improve
sensing
performance
n-type
metal
oxides
toward
oxidizing
NO2
(electron
acceptor)
RT.
To
this
end,
porous
SnO2
nanoparticles
(NPs)
assembled
from
grains
about
4
nm
with
rich
oxygen
vacancies
are
developed
through
an
acetylacetone-assisted
solvent
evaporation
approach
combined
precise
N2
air
calcinations.
The
results
show
that
as-fabricated
NPs
sensor
exhibits
unprecedented
-sensing
performance,
including
outstanding
(Rg
/Ra
=
772.33
@
5
ppm),
fast
recovery
(<2
s),
extremely
detection
limit
(10
ppb),
exceptional
selectivity
(response
ratio
>30)
Theoretical
calculation
experimental
tests
confirm
excellent
mainly
attributed
unique
transfer.
This
work
proposes
useful
strategy
for
developing
high-performance
RT
using
oxides,
provides
in-depth
understanding
basic
characteristics
on
sensing,
paving
way
efficient
power
consumption
ACS Applied Nano Materials,
Год журнала:
2024,
Номер
7(3), С. 3229 - 3238
Опубликована: Янв. 29, 2024
Detecting
trace-level
nitrogen
dioxide
(NO2)
in
real
time
is
critical
due
to
its
adverse
impact
on
human
health
and
the
environment.
However,
achieving
a
fast
response,
high
sensitivity
selectivity,
excellent
stability
NO2
detection
remains
challenge.
Two-dimensional
(2D)
metal
chalcogenides
are
promising
for
gas
sensing,
but
their
practical
use
thwarted
by
issues
like
insufficient
recovery
poor
stability.
As
an
alternative,
it
anticipated
that
2D
oxychalcogenides,
emerging
class
of
gas-sensing
semiconductor
materials,
offer
favorable
characteristics.
In
this
work,
p-type
gallium
oxyselenide
nanosheets
tailored
with
various
oxygen
concentrations
synthesized
regulating
annealing
temperature
selenide.
We
find
sensor
based
GaSe0.31O0.69
exhibits
highest
response
58.28%
10
ppm
at
room
temperature.
addition,
has
more
than
times
higher
interfering
gases.
More
importantly,
material
exhibited
outstanding
long-term
(up
4
months)
demonstrated
reversible
This
work
paves
cost-effective
way
development
room-temperature
sensors,
exhibiting
exceptional
