Efficient
microwave
absorbers
are
needed
to
address
the
electromagnetic
pollution
caused
by
proliferation
of
new
radio
technologies
and
equipment.
Excellent
absorption
performance
can
be
achieved
controlling
dielectric
constant.
Heteroatom-doped
bimetallic
materials
promising
wave
(EMA)
due
their
tunable
structures
low
cost.
In
particular,
presence
anionic
sites
significantly
affects
constant
electrical
conductivity.
Herein,
a
one-dimensional
carbon
nanofiber
material
is
prepared
encapsulating
FeCo
nanoparticles
in
fiber
cavity
electrostatic
spinning.
Subsequently,
tellurization,
vulcanization,
selenization
processes
carried
out.
FeTe2/
CoTe2@C
exhibits
stronger
conductivity
loss
lower
electronegativity
Te.
The
clever
configuration
FeTe2,
CoTe2,
C
heterostructures
obtained
Te
doping
generates
multi-heterogeneous
interfaces
that
facilitate
charge
migration
enhance
loss,
optimizing
EMA
performance.
FeTe2/CoTe2@C
an
optimum
minimum
reflection
(RLmin)
−51.1
dB
with
matching
thickness
2.0
mm,
effective
bandwidth
(EAB)
reaches
4.2
GHz.
Radar
cross-section
(RCS)
calculations
show
great
potential
for
practical
military
stealth
technology.
This
study
offers
novel
guidance
improving
properties
transition
metal
matrix
composites
via
coordination
modulation.
Small,
Journal Year:
2024,
Volume and Issue:
20(32)
Published: March 19, 2024
Abstract
Carbon
fiber
(CF)
is
a
potential
microwave
absorption
(MA)
material
due
to
the
strong
dielectric
loss.
Nevertheless,
owing
high
conductivity,
poor
impedance
matching
of
carbon‐based
materials
results
in
limited
MA
performance.
How
solve
this
problem
and
achieve
excellent
performance
remains
principal
challenge.
Herein,
taking
full
advantage
CF
bimetallic
metal–organic
frameworks
(MOF)
derivatives
layer,
an
absorber
based
on
micron‐scale
1D
NiCoMOF
(CF@NiCoMOF‐800)
developed.
After
adjusting
oxygen
vacancies
MOF,
resultant
presented
properties
including
minimum
reflection
loss
(RL
min
)
−80.63
dB
wide
effective
bandwidth
(EAB)
8.01
GHz
when
its
mass
percent
only
5
wt.%
thickness
2.59
mm.
Simultaneously,
mechanical
epoxy
resin
(EP)‐based
coating
with
are
effectively
improved.
The
hardness
(H),
elastic
modulus
(E),
bending
strength,
compressive
strength
CF@NiCoMOF‐800/EP
334
MPa,
5.56
GPa,
82.2
135.8
which
38%,
15%,
106%
53%
higher
than
EP
coating.
This
work
provides
promising
solution
for
carbon
achieving
properties.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 7, 2024
Abstract
Heterointerface
engineering
is
presently
considered
a
valuable
strategy
for
enhancing
the
microwave
absorption
(MA)
properties
of
materials
via
compositional
modification
and
structural
design.
In
this
study,
sulfur‐doped
multi‐interfacial
composite
(Fe
7
S
8
/NiS@C)
coated
with
NiFe‐layered
double
hydroxides
(LDHs)
successfully
prepared
using
hydrothermal
method
post‐high‐temperature
vulcanization.
When
assembled
into
twisted
surfaces,
NiFe‐LDH
nanosheets
exhibit
porous
morphologies,
improving
impedance
matching,
scattering.
Sulfur
doping
in
composites
generates
heterointerfaces,
numerous
sulfur
vacancies,
lattice
defects,
which
facilitate
polarization
process
to
enhance
MA.
Owing
controllable
heterointerface
design,
unique
structure
induced
multiple
endowing
Fe
/NiS@C
an
enhanced
MA
capability.
particular,
minimum
reflection
loss
(RL
min
)
value
reached
−58.1
dB
at
15.8
GHz
thickness
2.1
mm,
broad
effective
bandwidth
(EAB)
7.3
achieved
2.5
mm.
Therefore,
exhibits
remarkable
potential
as
high‐efficiency
material
owing
synergistic
effects
processes,
scatterings,
structures,
matching.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Cellulose
aerogels,
as
a
novel
class
of
carbon-based
materials,
exhibit
immense
potential
in
the
field
microwave
absorption
(MWA)
due
to
their
biocompatibility,
low
density,
unique
porous
structure,
and
tunable
architecture.
However,
development
multi-dimensional
components
with
specialized
heterogeneous
structures,
which
are
based
on
cellulose
remains
significant
challenge.
This
0D/1D/3D
structural
configuration
facilitates
electromagnetic
properties
favorable
impedance
matching.
The
Schottky
contact
at
ZnO/Ni
interface,
particular,
induces
strong
interfacial
polarization,
design
results
multiple
heterointerfaces.
Density
functional
theory
(DFT)
calculations
reveal
that
barrier
causes
band
bending,
facilitating
directed
migration
electrons
interface
formation
an
internal
electric
field,
thus
significantly
accelerating
multipolar
relaxation
process.
As
anticipated,
CCMC/ZnO@Ni
aerogel
exhibits
minimum
reflection
loss
(RLmin)
value
-64.0
dB
13.9
GHz
thickness
2.0
mm,
its
effective
bandwidth
(EAB)
reaches
4.9
GHz.
work
gives
valuable
guidance
inspiration
for
materials
composed
dimensional
gradient
holds
great
application
wave
(EMW)
attenuation.
