Journal of Advanced Ceramics,
Год журнала:
2023,
Номер
12(10), С. 1946 - 1960
Опубликована: Авг. 28, 2023
The
single
Ti3C2Tx
MXene
material
is
not
suitable
for
electromagnetic
(EM)
wave
absorption
due
to
its
high
conductivity
and
impedance
mismatch.
To
address
this
issue,
we
ingeniously
take
advantage
of
easily
oxidized
characteristic
establish
structural
defects
multiphase
engineering
in
accordion-like
TixO2x-1
derived
from
by
the
high-temperature
hydrogen
reduction
process
first
time.
phase
evolution
sequences
are
revealed
be
MXene/anatase
TiO2
→
MXene/rutile
(1≤x≤4)
during
reaction.
Benefiting
conductance
loss
caused
hole
motion
under
action
external
electric
field
heterointerfaces
interfacial
polarization,
match
EM
attenuation
capability
absorbers
superior
that
pristine
MXene/TiO2
material.
Additionally,
simulated
whole
radar
cross
section
(RCS)
plots
different
incident
angular
product
lower
than
-20
dBm2
minimum
RCS
value
can
reach
-43
dBm2,
implying
a
great
potential
practical
application
absorption.
Moreover,
relationship
between
charges,
defects,
interfaces,
performances
materials
systematically
clarified
energy
band
theory,
which
research
other
MXene-derived
semiconductor
absorbing
composites.
Nano-Micro Letters,
Год журнала:
2024,
Номер
16(1)
Опубликована: Июнь 17, 2024
Abstract
Considering
the
serious
electromagnetic
wave
(EMW)
pollution
problems
and
complex
application
condition,
there
is
a
pressing
need
to
amalgamate
multiple
functionalities
within
single
substance.
However,
effective
integration
of
diverse
functions
into
designed
EMW
absorption
materials
still
faces
huge
challenges.
Herein,
reduced
graphene
oxide/carbon
foams
(RGO/CFs)
with
two-dimensional/three-dimensional
(2D/3D)
van
der
Waals
(vdWs)
heterostructures
were
meticulously
engineered
synthesized
utilizing
an
efficient
methodology
involving
freeze-drying,
immersing
absorption,
secondary
followed
by
carbonization
treatment.
Thanks
their
excellent
linkage
effect
amplified
dielectric
loss
optimized
impedance
matching,
2D/3D
RGO/CFs
vdWs
demonstrated
commendable
performances,
achieving
broad
bandwidth
6.2
GHz
reflection
−
50.58
dB
low
matching
thicknesses.
Furthermore,
obtained
also
displayed
significant
radar
stealth
properties,
good
corrosion
resistance
performances
as
well
outstanding
thermal
insulation
capabilities,
displaying
great
potential
in
variable
environments.
Accordingly,
this
work
not
only
straightforward
method
for
fabricating
heterostructures,
but
outlined
powerful
mixed-dimensional
assembly
strategy
engineering
multifunctional
protection,
aerospace
other
conditions.
Nano-Micro Letters,
Год журнала:
2024,
Номер
16(1)
Опубликована: Июнь 11, 2024
Abstract
The
exploration
of
novel
multivariate
heterostructures
has
emerged
as
a
pivotal
strategy
for
developing
high-performance
electromagnetic
wave
(EMW)
absorption
materials.
However,
the
loss
mechanism
in
traditional
is
relatively
simple,
guided
by
empirical
observations,
and
not
monotonous.
In
this
work,
we
presented
semiconductor–semiconductor–metal
heterostructure
system,
Mo–MXene/Mo–metal
sulfides
(metal
=
Sn,
Fe,
Mn,
Co,
Ni,
Zn,
Cu),
including
semiconductor
junctions
Mott–Schottky
junctions.
By
skillfully
combining
these
distinct
functional
components
(Mo–MXene,
MoS
2
,
metal
sulfides),
can
engineer
multiple
heterogeneous
interface
with
superior
capabilities,
broad
effective
bandwidths,
ultrathin
matching
thickness.
successful
establishment
gives
rise
to
built-in
electric
field
that
intensifies
electron
transfer,
confirmed
density
theory,
which
collaborates
dielectric
polarization
mechanisms
substantially
amplify
EMW
absorption.
We
detailed
synthesis
series
featuring
both
semiconductor–semiconductor
semiconductor–metal
interfaces.
achievements
were
most
pronounced
Mo–MXene/Mo–Sn
sulfide,
achieved
remarkable
reflection
values
−
70.6
dB
at
thickness
only
1.885
mm.
Radar
cross-section
calculations
indicate
MXene/Mo–metal
have
tremendous
potential
practical
military
stealth
technology.
This
work
marks
departure
from
conventional
component
design
limitations
presents
pathway
creation
advanced
MXene-based
composites
potent
capabilities.
Abstract
Material
composition
and
structural
design
are
important
factors
influencing
the
electromagnetic
wave
(EMW)
absorption
performance
of
materials.
To
alleviate
impedance
mismatch
attributed
to
high
dielectric
constant
Ti
3
C
2
T
x
MXene,
we
have
successfully
synthesized
core‐shell
structured
SiO
@MXene@MoS
nanospheres.
This
architecture,
comprising
as
core,
MXene
intermediate
layer,
MoS
outer
shell,
is
achieved
through
an
electrostatic
self‐assembly
method
combined
with
a
hydrothermal
process.
complex
structure
not
only
provides
variety
loss
mechanisms
that
effectively
dissipate
energy
but
also
prevents
self‐aggregation
nanosheets.
Notably,
synergistic
combination
highly
conductive
enables
suitable
composites,
ensuring
optimal
matching.
Therefore,
nanospheres
exhibit
excellent
EMW
performance,
featuring
remarkable
minimum
reflection
(RL
min
)
−52.11
dB
(2.4
mm).
It
noteworthy
these
achieve
ultra‐wide
effective
bandwidth
(EAB)
6.72
GHz.
work
novel
approach
for
designing
synthesizing
high‐performance
absorbers
characterized
by
“wide
strong
loss.”
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(32)
Опубликована: Март 28, 2024
Abstract
Polarization
relaxation
loss
caused
by
defects
and
interfaces
has
become
a
fascinating
electromagnetic
wave
(EMW)
mechanism.
However,
the
logical
relationship
between
impedance
matching
various
mechanisms
requires
further
elucidation
to
facilitate
more
comprehensive
in‐depth
research.
Herein,
phase
engineering
on
molybdenum
disulfide
(MoS
2
)
is
proposed
as
main
controller
of
permittivity,
offering
straightforward
highly
effective
method
for
regulating
permittivity.
Through
control
engineering,
small
gradient,
monotonic
change
permittivity
across
substantial
area
achieved,
leading
gradual
transition
material
system
from
strong
but
mismatching
weak
EMW
transparent
phase.
Thanks
fundamental
regulation
characteristic
attenuation
capacity
dielectric
gene
controlled
combined
with
ingenious
coordination
sulfur
vacancy‐induced
polarization
interfacial
polarization,
t‐60
harvests
an
absorption
band
6.8
GHz
minimum
reflection
−59.8
dB.
This
study
effectively
expands
pool
improves
research
logic
mechanisms,
valuable
insights
development
advanced
absorbing
materials.
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
12(21), С. 7775 - 7783
Опубликована: Янв. 1, 2024
An
ice
dissolution-normal
pressure
drying
strategy
based
on
graphite
nanosheet
was
proposed
to
prepare
porous
PVDF
foams,
which
own
exceptional
microwave
absorption
(RL
max
=
−57.68
dB,
EAB
6.86
GHz)
and
compression
strength
(300.9
kPa).
