ACS Applied Nano Materials,
Год журнала:
2023,
Номер
6(13), С. 11888 - 11901
Опубликована: Июнь 28, 2023
Highly
flexible,
bendable,
stretchable,
and
ultralightweight
microwave
absorbers
(MA)
that
can
handle
harsh
environments
are
essential
for
conformal
surface
coating
in
aerospace
defence
industries.
Hence,
crystalline
carbon
nanotubes
(CNTs)
grown
on
fibers
(CFs)
using
the
chemical
vapour
deposition
technique
(CVD)
embedded
polyurethane
(PU)
to
obtain
MA.
The
fabricated
MA
is
highly
stretchable
(>400%),
has
a
low
percolation
threshold
(0.1
wt
%),
(0.35
thin
nanocomposite
enhanced
absorber
performance.
thickness
of
optimized
achieve
impedance
matching
condition
by
utilizing
CST
studio
simulation
verified
experimentally.
minimum
reflection
loss
(RL)
−52.53
dB
with
effective
bandwidth
(EAB)
covering
complete
X
band
at
2.4
mm
obtained
just
0.35
%
CFCNT.
negligible
change
RL
EAB
after
1000
bending
cycles
2
h
water-bath
sonication
confirms
operating
efficiency
environmental
conditions.
mechanism
absorption
case
CF
CFCNT-based
elucidated
concerning
properties,
electrical
conductivity,
morphology.
also
extended
from
Ku
(12.4–18
GHz)
broadband
application.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Март 25, 2024
Abstract
Defects
and
microstructures
have
been
utilized
to
effectively
modulate
electromagnetic
(EM)
wave
absorption
for
mitigating
pollution
stealth
issues.
However,
precisely
feasibly
tailoring
them
still
remains
challenging.
Here,
by
using
a
multilevel
hollow
cobalt
sulfide
embedded
in
heteroatomic
sulfur
(S)
‐doped
carbon
aerogel,
preferential
reaction
strategy
of
modulating
point
defects
via
controllable
S
atoms
migration
is
proposed
improve
the
EM
absorption.
contribute
creation
structures
Kirkendall
effects,
as
well
inducing
lattice
through
doping.
More
significantly,
mechanisms
prioritizing
formation
over
discovered,
with
low‐velocity
atomic
primarily
microstructure
interfacial
polarization
impedance
matching,
high‐velocity
atom
focused
on
introducing
achieve
conductive
loss.
The
resulting
aerogel
exhibits
an
exceptionally
maximum
reflection
loss
−52.82
dB
effective
bandwidth
8.82
GHz,
which
far
exceeds
most
currently
reported
materials.
Experimental
theoretical
approaches,
including
microwave
heating,
Tesla
interaction,
first
principles,
far‐field
simulation,
are
comprehensively
employed
verify
its
effect
mechanism.
Furthermore,
combination
excellent
infrared
self‐cleaning
properties
opens
up
potential
applications
complex
environments.
ACS Nano,
Год журнала:
2024,
Номер
18(6), С. 5040 - 5050
Опубликована: Янв. 29, 2024
High
entropy
alloys
(HEA)
have
garnered
significant
attention
in
electromagnetic
wave
(EMW)
absorption
due
to
their
efficient
synergism
among
multiple
components
and
tunable
electronic
structures.
However,
high
density
limited
chemical
stability
hinder
progress
as
lightweight
absorbers.
Incorporating
HEA
with
carbon
offers
a
promising
solution,
but
synthesizing
stable
HEA/carbon
composite
faces
challenges
the
propensity
for
phase
separation
during
conventional
heat
treatments.
Moreover,
EMW
mechanisms
HEAs
may
be
different
from
established
empirical
models
high-entropy
effect.
This
underscores
urgent
need
synthesize
absorbers
uncover
intrinsic
mechanisms.
Herein,
we
successfully
integrated
quinary
FeCoNiCuMn
into
honeycomb-like
porous
nanofiber
(HCNF)
using
electrostatic
spinning
Joule-heating
method.
Leveraging
inherent
lattice
distortion
effects
honeycomb
structure,
HCNF/HEA
demonstrates
outstanding
properties
at
an
ultralow
filler
loading
of
2
wt
%.
It
achieves
minimum
reflection
loss
−65.8
dB
boasts
maximum
bandwidth
up
7.68
GHz.
study
not
only
showcases
effectiveness
combining
HCNF
HEA,
also
potential
synthesis
developing
HEA-based
