Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 17, 2024
Abstract
Local
charge
modulation
is
an
effective
method
to
improve
the
polarization
loss
and
electromagnetic
(EM)
absorption
characteristics.
However,
use
of
conventional
means
(doping,
defects,
heterojunction
surfaces)
remains
singular
limited
in
achieving
local
modulation.
Surprisingly,
lattice
distortions
induced
by
high‐entropy
engineering
can
intrinsically
regulate
states
EM
wave
performances.
Herein,
a
series
selenides
with
enhanced
configuration
entropy
are
designed
prepared
capacity.
Due
different
radii
mixed
ions
Jahn‐Teller
distortion
effect,
effectively
modulated
presence
defects
strong
inside
lattice.
Uneven
distribution
at
formation
boundaries
promotes
defect‐induced
interface
polarization,
respectively.
Compared
single
NiSe
2
,
(NiFeCuCoMn)Se
value
1.53R
has
more
severe
suitable
impedance
matching
properties,
exhibiting
good
properties
both
intensity
respond
frequency.
Tailoring
density
via
strategy
paves
new
way
for
high‐performance
materials.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 15, 2025
Abstract
It
is
crucial
to
develop
electromagnetic
interference
(EMI)
shielding
materials
with
high
efficiency
(SE)
and
reduced
reflection
mitigate
the
secondary
pollution
caused
by
waves
(EMWs).
Herein,
a
novel
multilayer
assembly
strategy
inspired
structure
of
“Turkish
dessert—Baklava”
proposed
introduce
magnetic
hollow
Fe
3
O
4
nanospheres
(HFO)
conductive
MXene
nanosheets
into
bacterial
cellulose
(BC)
network.
Through
layer‐by‐layer
vacuum
filtration
approach,
composite
BC/MXene/HFO
film
controllable
electric‐magnetic
dual‐gradient
achieved.
The
construction
dual
gradients
alleviates
impedance
mismatch
at
air‐film
interface,
resulting
in
reflectivity
toward
EMWs,
while
unique
HFO
facilitates
“absorption–reflection–reabsorption”
process
EMWs.
Consequently,
as‐prepared
(0.35
mm
thickness)
exhibits
an
extraordinary
EMI
SE
67.6
dB
as
low
5.1
dB.
Furthermore,
it
also
demonstrates
exceptional
mechanical
properties,
efficient
thermal
management,
Joule
heating
capabilities,
well
remarkable
passive
active
infrared
camouflage
performances.
This
study
offers
innovative
approach
achieve
less
more
absorption
expands
application
scope
precision
electronics,
aerospace,
military
equipment
fields.
Small Methods,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 28, 2025
Abstract
With
the
advent
of
5G
era,
there
has
been
a
marked
increase
in
research
interest
concerning
electromagnetic
wave‐absorbing
materials.
A
critical
challenge
remains
improving
properties
these
materials
while
satisfying
diverse
application
demands.
MXenes,
identified
as
prominent
“emerging”
2D
for
wave
absorption,
offer
unique
advantages
that
are
expected
to
drive
advancements
and
innovations
this
field.
This
review
emphasizes
synthesis
benefits
provided
by
structural
characteristics
MXenes
performance
enhancements
achieved
through
their
combination
with
other
absorbing
Material
requirements,
approaches,
conceptual
frameworks
integrated
underscore
advantages.
The
study
provides
thorough
analysis
MXene‐absorbing
composites,
going
beyond
basic
classification
address
preparation
modification
processes
affecting
absorption
composites.
Attention
is
directed
techniques,
design
principles,
influence
on
composite
performance.
Additionally,
potential
applications
devices
summarized.
concludes
addressing
challenges
currently
confronting
MXene
outlining
developmental
trends,
aiming
guidance
subsequent
domain.
To
meet
the
requirements
of
lightweight
and
wideband
attenuation
for
advanced
electromagnetic
(EM)
absorption
materials,
combination
both
MOF
composition
hierarchical
structural
design
was
applied
as
strategy
to
prepare
MOF-derived
Co@SiC
nanowire
(Co@SiCnw)
nanocomposite
aerogel.
The
laminated
structures
with
multiple
Co@SiCnw
layers
were
constructed
via
a
mixed
growth-assisted
freeze-drying
calcination
process.
ultralightweight
presents
low
density
0.11
g/cm3.
With
abundant
second-phase
polarization
interfaces
enlarged
EM
wave
channels
enhance
dielectric
conductive
loss,
optimized
offers
minimal
reflection
loss
(RLmin)
-61.4
dB
at
10.0
GHz
(2.64
mm)
an
effective
bandwidth
(EAB)
wide
7.44
sample
thickness
only
2.16
mm.
Furthermore,
multifunctionalities,
including
density,
thermal
insulation,
self-standing,
demonstrated
Co@SiCnw,
making
it
high-performance
practical
microwave
material.
