Single-walled
carbon
nanotubes
(SWNTs),
renowned
for
their
high
strength
and
electromagnetic
properties,
provide
a
potential
solution
next-generation
honeycomb-structured
radar-absorbing
materials
(HRAMs).
However,
the
integration
of
SWNTs
into
HRAMs
is
hindered
by
challenges
including
poor
dispersion,
wash-off
loss,
absence
scalable,
compatible
fabrication
methods.
Herein,
we
address
these
synthesizing
tunable
conductive
SWNT-coated
aramid
fibers
(SWNT-AF)
via
continuous
dip-coating
method
integrating
them
paper-based
composites
(APBC)
to
fabricate
HRAMs.
The
SWNT-AF
serve
as
both
structural
reinforcements
dielectric
loss
centers
within
APBC,
avoiding
direct
dispersion
pulp
thereby
mitigating
agglomeration
loss.
optimized
reinforced
with
tailored
fibers,
exhibit
improved
resulting
in
enhanced
microwave
absorption
performance.
fabricated
achieve
an
effective
bandwidth
14.8
GHz
(2.0-18.0
GHz)
ultralow
SWNT
loading
0.2
wt
%
thin
thickness
only
30
mm,
demonstrating
reflection
-47.78
dB.
These
results
highlight
lightweight,
broadband
stealth
applications.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 28, 2025
Abstract
The
absorption
performance
of
electromagnetic
(EM)
wave
absorbing
materials
deteriorates
sharply
at
large
incident
angles,
particularly
angles
exceeding
50°.
To
overcome
this
challenge,
study
proposes
a
bionic
grooving
all‐cementitious‐dielectric
metastructure
(ACDMS),
yielding
more
than
34.6
GHz
effective
bandwidth
(
EAB
)
over
0°–60°
without
any
agent.
effects
structural
design,
geometric
parameters,
and
on
the
EM
response
are
investigated
by
numerical
simulations
experimental
characterizations.
It
is
found
that
ACDMS
enables
multiple
mechanisms
under
various
including
electric
field
redistribution,
multi‐axis
interference,
surface
excitation,
diffraction/scattering
pathways.
Experimental
results
demonstrate
60°
angle,
even
exceeds
normal
incidence,
achieving
relative
163%,
‐20
dB
(99%
absorption)
33.4
GHz,
mean
reflectivity
−23.4
in
1–40
range.
RCS
simulation
environmental
testing
across
fluctuating
humidity
(40%–80%)
temperature
(10–220
°C)
exposures
underscore
exceptional
potential
for
practical
applications
harsh
conditions.
combination
innovative
mechanisms,
adaptability
convenient
cement‐based
manufacturing
process
establishes
as
promising
candidate
next‐generation
absorbers.
ACS Applied Materials & Interfaces,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 1, 2025
Due
to
widespread
applications
of
electromagnetic
waves
(EMWs)
in
radar
and
communication
systems,
there
is
an
urgent
need
for
developing
EMW
absorbers
capable
working
efficiently
at
multiple
frequency
points.
In
this
work,
flexible
metamaterial
(MAs)
based
on
Fe3O4-doped
laser-induced
graphene
(LIG/Fe3O4)
are
large-scale
fabricated
with
the
absorption
bands
tunable
by
regulating
ferric
chloride
concentration
laser
path
LIG/Fe3O4
meta-surface.
The
as-prepared
triple
band
MA
demonstrates
superior
S11
values
-15.0
dB
(9.0
GHz),
-40.7
(12.2
-23.2
(16.8
respectively,
attributed
subwavelength
units
LIG/Fe3O4,
synergistically
combining
dielectric
magnetic
loss.
Moreover,
MAs
exhibit
commendable
corrosion
resistance
cross-section
reduction
characteristics,
showing
promising
potential
protection
fields.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 14, 2025
Abstract
The
compatible
defense
across
electromagnetic
and
optical
bands
is
extremely
challenging
for
the
development
of
stealth
materials.
Herein,
adopting
material
selection
structural
design
strategy,
an
integral
Ti
3
C
2
T
x
(MXene)/reduced
graphene
oxide
(RGO)/ZIF‐67(Co)
composite
aerogel
with
microwave/terahertz
absorption
module,
infrared
camouflage
visible
module
constructed,
which
first
enables
ultra‐wideband
spectrum.
high
reflection
loss
(−55.97
dB)
in
S,
C,
X,
Ku
bands,
excellent
shielding/absorption
performance
(69.5
dB/69.3
0.1–2.0
terahertz
can
be
achieved.
average
spectrum
>97.3%
greatly
reduces
signature
signals,
ensuring
indistinguishability
from
imaging
equipment.
thermal
function
temperature
difference
between
target
background,
realizing
concealment.
This
work
will
provide
effective
approach
to
building
advanced
versatile
ultra‐multi‐spectrum‐compatible
systems.
Single-walled
carbon
nanotubes
(SWNTs),
renowned
for
their
high
strength
and
electromagnetic
properties,
provide
a
potential
solution
next-generation
honeycomb-structured
radar-absorbing
materials
(HRAMs).
However,
the
integration
of
SWNTs
into
HRAMs
is
hindered
by
challenges
including
poor
dispersion,
wash-off
loss,
absence
scalable,
compatible
fabrication
methods.
Herein,
we
address
these
synthesizing
tunable
conductive
SWNT-coated
aramid
fibers
(SWNT-AF)
via
continuous
dip-coating
method
integrating
them
paper-based
composites
(APBC)
to
fabricate
HRAMs.
The
SWNT-AF
serve
as
both
structural
reinforcements
dielectric
loss
centers
within
APBC,
avoiding
direct
dispersion
pulp
thereby
mitigating
agglomeration
loss.
optimized
reinforced
with
tailored
fibers,
exhibit
improved
resulting
in
enhanced
microwave
absorption
performance.
fabricated
achieve
an
effective
bandwidth
14.8
GHz
(2.0-18.0
GHz)
ultralow
SWNT
loading
0.2
wt
%
thin
thickness
only
30
mm,
demonstrating
reflection
-47.78
dB.
These
results
highlight
lightweight,
broadband
stealth
applications.
