Arabian Journal of Chemistry,
Journal Year:
2024,
Volume and Issue:
17(3), P. 105651 - 105651
Published: Jan. 23, 2024
Excellent
electromagnetic
wave
absorption
ability
and
effective
bandwidth
have
been
the
development
direction
of
absorbing
materials.
In
this
paper,
a
rational
structural
design
is
proposed.
Graphene
oxide
(GO)/polyaniline
(PANI)
layer
was
formed
on
surface
natural
material
bamboo
powder
(BP)
by
an
interfacial
polymerization
process.
The
combination
GO
PANI
improves
impedance
mismatch
conductive
polymer
PANI.
Enhanced
dielectric
storage
loss
capability
composite
GO/PANI/BP.
addition
BP
brings
more
channels
to
This
unique
structure
facilitates
construction
three-dimensional
wave-reflecting
cavity,
which
absorptive
capacity
introducing
multiple
reflections.
conductivity
GO/PANI/BP
1.78
(±0.06)
S/cm.
When
filled
30
wt%,
minimum
reflection
(RLmin)
-44
dB
at
9.36
GHz
thickness
3
mm,
(<-10
dB)
up
5.36
in
frequency
range
12.64-18
2
mm.
Exhibits
superior
compared
most
previous
PANI-based
addition,
reflecting
cavity
can
provide
inspiration
for
other
materials
expands
candidate
green
efficient
absorbers.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
16(1)
Published: June 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.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(30)
Published: May 1, 2024
Abstract
2D
layered
metallic
graphite
composites
are
promising
electromagnetic
wave
absorption
materials
(EWAMs)
for
their
combined
properties
of
abundant
interlayer
free
spaces,
rich
polarized
sites,
and
high
conductivity,
but
the
controllable
synthesis
remains
rather
challenging.
Herein,
a
dual‐step
redox
engineering
strategy
is
developed
by
employing
cobalt
boron
imidazolate
framework
(Co‐BIF)
to
construct
CoNi‐alloy
embedded
B,
N‐doped
carbon
layers
(2D‐CNC)
as
EWAM.
In
first
step,
chemical
etching
oxidation
process
on
Co‐BIF
used
obtain
an
optimized
2D‐CoNi‐layered
double
hydroxide
(2D‐CoNi‐LDH)
intermediate
in
second,
high‐temperature
calcination
reduction
implemented
modify
graphitization
degree
2D‐CNC.
The
obtained
sample
delivers
superior
reflection
loss
(RL
min
)
−60.1
dB
wide
effective
bandwidth
(EAB)
6.24
GHz.
synergy
mechanisms
interfacial/dipole
polarization
magnetic
coupling
in‐depth
evidenced
hologram
Lorentz
electron
microscopy,
revealing
its
significant
contribution
multireflection
impedance
matching.
Further
theoretical
evaluation
COMSOL
simulation
different
fields
based
dynamic
toward
test
ring
reveals
situ
EW
attenuation
process.
This
work
presents
develop
multifunctional
light‐weight
infrared
stealthy
aerogel
with
pressure‐resistant,
anti‐corrosion,
heat‐insulating
future
applications.
