Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 12, 2025
Abstract
Microwave
absorption
materials
play
a
key
role
in
various
fields,
including
military
stealth,
human
safety
protection,
and
so
on.
Construction
of
2D
mesoporous
heterostructures
is
an
attractive
approach
to
enhance
wave‐absorbing
ability,
while
it
still
great
challenge.
Herein,
carbon‐MXene‐carbon
(MCMCH)
with
channels
parallel
surface
are
successfully
prepared
via
monolayer
interfacial
assembly
strategy.
Through
the
precise
adjustment
polymerization,
cylindrical
micelles
orderly
monolayered
assemble
on
both
surfaces
MXene
nanosheets,
resulting
switch‐like
polydopamine‐MXene‐polydopamine
MCMCH
finally
generated
by
further
calcination.
Due
excellent
dielectric
polarization
relaxation
conductive
loss,
achieves
strongest
reflection
loss
−54.2
dB
at
thickness
only
1.5
mm.
The
presence
mesochannels
not
introduces
air
low
permittivity
for
optimal
impedance
matching,
but
also
extends
attenuation
path
incident
electromagnetic
wave.
maximum
radar
cross‐section
reduction
26.9
m
2
achieved
compared
perfect
electric
conductor.
This
work
provides
reference
engineering
based
microwave
performance.
Nano-Micro Letters,
Год журнала:
2024,
Номер
17(1)
Опубликована: Сен. 26, 2024
Abstract
Atomic-scale
doping
strategies
and
structure
design
play
pivotal
roles
in
tailoring
the
electronic
physicochemical
property
of
electromagnetic
wave
absorption
(EMWA)
materials.
However,
relationship
between
configuration
(EM)
loss
mechanism
has
remained
elusive.
Herein,
drawing
inspiration
from
DNA
transcription
process,
we
report
successful
synthesis
novel
situ
Mn/N
co-doped
helical
carbon
nanotubes
with
ultrabroad
EMWA
capability.
Theoretical
calculation
EM
simulation
confirm
that
orbital
coupling
spin
polarization
Mn–N
4
–C
configuration,
along
cross
generated
by
structure,
endow
converters
enhanced
loss.
As
a
result,
HMC-8
demonstrates
outstanding
performance,
achieving
minimum
reflection
−63.13
dB
at
an
ultralow
thickness
1.29
mm.
Through
precise
tuning
graphite
domain
size,
HMC-7
achieves
effective
bandwidth
(EAB)
6.08
GHz
2.02
mm
thickness.
Furthermore,
constructing
macroscale
gradient
metamaterials
enables
ultrabroadband
EAB
12.16
only
5.00
mm,
maximum
radar
section
reduction
value
reaching
36.4
m
2
.
This
innovative
approach
not
advances
understanding
metal–nonmetal
co-doping
but
also
realizes
broadband
EMWA,
thus
contributing
to
development
mechanisms
applications.
Modern
detection
technology
has
driven
camouflage
toward
multispectral
compatibility
and
dynamic
regulation.
However,
developing
such
stealth
technologies
is
challenging
due
to
different
frequency-band
principles.
Here,
this
work
proposes
a
design
concept
for
fluid-actuated
compatible
smart
device
that
employs
deformable
mechanochromic
layer/elastomer
with
channeled
dielectric
layer.
After
fluid
actuation,
the
elastomer
layer
transmits
mechanical
strain
layer,
thereby
altering
visible
reflectance
wavelengths
in
[568,
699]
nm.
Concurrently,
pumped-in
liquid
reconfigures
spatial
structure
parameter
alter
microwave
resonance
diffraction
radar
absorption,
enabling
absorption
significant
broadband
at
[8.16,
18.0]
GHz.
Using
heat-absorption
property
also
achieves
infrared
stealth,
shown
by
ΔT
≈
16.5
°C
temperature
difference.
Additionally,
exhibits
rapid
response
time
(∼1
s),
excellent
cycling
performance
(100
cycles),
programmability
(10
codes),
offering
new
strategy.
