Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 9, 2024
Abstract
Porous
materials
emerging
as
potential
high‐efficiency
electromagnetic
(EM)
wave
absorbers
confront
a
critical
trade‐off
between
impedance
matching
and
attenuation
capability.
In
this
study,
versatile
strategy
is
reported
to
overcome
challenge
by
constructing
gradient
pores
via
solvent‐assisted
linker
exchange
for
the
fabrication
of
metal‐organic
framework
(MOF)
derived
Fe/Fe
3
Co
7
/Co/C
composites
with
high
porosity.
The
characteristics
single‐pored
gradient‐pored
derivatives
are
investigated
through
combined
experimental
simulation
approaches.
Simulated
space
EM
field,
loss
density,
Smith
charts
reveal
significantly
enhanced
interactions
optimized
within
pores.
Compared
individual
MOF
derivatives,
derivative
exhibits
improved
from
large‐pored
shell
superior
capability
small‐pored
core,
giving
rise
Pareto
improvement
in
absorption
strong
reflection
(−64.7
dB)
wide
effective
adsorption
bandwidth
(5.8
GHz)
at
thickness
2.5
mm.
This
work
not
only
advances
novel
pore
efficient
capability,
but
also
sheds
light
on
underlying
mechanisms
interaction
varied
porosity,
offering
insights
extended
designs
magnetic,
electric
optic
devices.
ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(16), P. 19427 - 19438
Published: July 31, 2024
To
meet
the
demands
for
high-performance
and
cost-effective
electromagnetic
wave
absorbers
in
practical
applications,
CoNi
alloy/N-doped
hollow
carbon
foam
(CoNi/NCF)
was
synthesized
using
melamine
as
a
precursor
through
hydrothermal
reaction.
By
introduction
of
appropriate
alloys
to
form
uniform
magnetic
metal
nanoparticles
on
surface
NCF,
absorption
performance
NCF
can
be
adjusted.
These
formed
rich
heterogeneous
interfaces
with
enhancing
interface
polarization
loss
composite
material
waves.
The
alloy
increased
conductivity
materials,
which
conducive
formation
three-dimensional
conductive
network
promoted
conduction
As
metal,
also
brought
losses
increasing
ways
consume
Additionally,
doping
N
atoms
dipole
NCF.
minimum
reflection
(RLmin)
CoNi/NCF
reached
−47.35
dB,
maximum
effective
bandwidth
(EAB)
5.6
GHz
(2.4
mm).
effectively
reduced
radar
cross-section
(RCS)
signal
electric
conductor
layer.
This
study
provides
feasible
strategy
developing
materials
an
efficient
performance.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 9, 2024
Abstract
Porous
materials
emerging
as
potential
high‐efficiency
electromagnetic
(EM)
wave
absorbers
confront
a
critical
trade‐off
between
impedance
matching
and
attenuation
capability.
In
this
study,
versatile
strategy
is
reported
to
overcome
challenge
by
constructing
gradient
pores
via
solvent‐assisted
linker
exchange
for
the
fabrication
of
metal‐organic
framework
(MOF)
derived
Fe/Fe
3
Co
7
/Co/C
composites
with
high
porosity.
The
characteristics
single‐pored
gradient‐pored
derivatives
are
investigated
through
combined
experimental
simulation
approaches.
Simulated
space
EM
field,
loss
density,
Smith
charts
reveal
significantly
enhanced
interactions
optimized
within
pores.
Compared
individual
MOF
derivatives,
derivative
exhibits
improved
from
large‐pored
shell
superior
capability
small‐pored
core,
giving
rise
Pareto
improvement
in
absorption
strong
reflection
(−64.7
dB)
wide
effective
adsorption
bandwidth
(5.8
GHz)
at
thickness
2.5
mm.
This
work
not
only
advances
novel
pore
efficient
capability,
but
also
sheds
light
on
underlying
mechanisms
interaction
varied
porosity,
offering
insights
extended
designs
magnetic,
electric
optic
devices.
