Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 21, 2024
Abstract
With
the
rapid
advancements
in
wireless
communication
and
radar
detection
technologies,
there
has
been
a
significant
uptick
utilization
frequency
of
electromagnetic
waves
across
both
civilian
military
sectors,
consequently
generating
substantial
radiation
interference.
These
pollutants
present
considerable
threat
to
public
health
information
security.
Consequently,
materials
capable
absorbing
mitigating
pollution
have
garnered
attention.
The
nanomaterials
with
multiple
components
various
heterogeneous
interfaces
considered
as
preferred
efficient
wave
(EMW)
absorbers.
In
this
work,
carbon
nanofibers
doped
magnetic
metal
oxide
particles
(Co/Ni‐CNFs)
are
prepared
by
electrospinning
heat
treatment.
these
samples,
minimum
reflection
loss
can
reach
−40.13
dB
at
4.6
mm,
widest
effective
absorption
bandwidth
is
4.4
GHz.
excellent
microwave
attributed
appropriate
impedance
matching.
parameters
Co/Ni‐CNFs
balanced
adjusting
concentration
metal‐organic
framework
material
(MOFs)
precursor
solution.
It
believed
that
work
provide
reference
for
developing
lightweight,
flexible,
robust
wave‐absorbing
materials.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(44)
Published: May 21, 2024
Abstract
Anion
defect
engineering
is
proven
to
be
an
efficient
approach
reconstruct
the
electronic
configuration
of
carbon‐based
magnetoelectric
materials
for
targeted
modulation
electromagnetic
(EM)
performance.
However,
traditional
mono‐anionic
doping
suffers
from
low
concentration
and
lacks
diverse
polarization
mechanisms.
In
this
work,
multi‐anions
(N/S/F)
stepwise‐doped
carbon/Fe
3
C
composites
are
elaborately
constructed,
wherein
predesigned
N
defects
serve
as
activated
sites
anomalously
adopting
S
anions
(Step
I)
subsequent
F
II)
in
non‐marginal
areas
carbon
layer.
It
found
that
prefers
replace
pyrrolic
while
tends
form
dangling
bonds
with
site
adjacent
pyridinic
N.
Intriguingly,
besides
inherent
polarized
resonance
at
≈15
GHz,
customized
induce
new
resonances
≈10
GHz
≈15+
respectively.
Under
a
typical
multi‐polarization
effect
synergetic
magnetic
response,
N/S/F
harvest
broadest
bandwidth
8.28
(9.72–18
GHz)
2.55
mm,
covering
wide
frequency
range
almost
X
Ku
bands.
This
work
demonstrates
positive
impact
localized
multi‐defects
customization
on
expanding
microwave
absorption
bandwidth,
providing
valuable
insights
advanced
design
ultra‐broadband
absorbers.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: Sept. 20, 2024
Abstract
Research
efforts
on
electromagnetic
interference
(EMI)
shielding
materials
have
begun
to
converge
green
and
sustainable
biomass
materials.
These
offer
numerous
advantages
such
as
being
lightweight,
porous,
hierarchical.
Due
their
porous
nature,
interfacial
compatibility,
electrical
conductivity,
hold
significant
potential
EMI
Despite
concerted
the
of
been
reported,
this
research
area
is
still
relatively
new
compared
traditional
In
particular,
a
more
comprehensive
study
summary
factors
influencing
including
pore
structure
adjustment,
preparation
process,
micro-control
would
be
valuable.
The
methods
characteristics
wood,
bamboo,
cellulose
lignin
in
field
are
critically
discussed
paper,
similar
summarized
analyzed.
composite
fillers
various
were
reviewed.
paper
also
highlights
mechanism
well
existing
prospects
challenges
for
development
trends
field.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: Sept. 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.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: Oct. 16, 2024
Developing
advanced
stealth
devices
to
cope
with
radar-infrared
(IR)
fusion
detection
and
diverse
application
scenarios
is
increasingly
demanded,
which
faces
significant
challenges
due
conflicting
microwave
IR
cloaking
mechanisms
functional
integration
limitations.
Here,
we
propose
a
multiscale
hierarchical
structure
design,
integrating
wrinkled
MXene
shielding
layer
flexible
Fe
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 12, 2024
Abstract
In
contemporary
times,
radar
and
infrared‐compatible
stealth
materials
have
emerged
as
a
pivotal
domain
of
research
globally,
aimed
at
augmenting
the
survivability
military
assets.
However,
current
candidates
generally
exhibit
subpar
compatibility
performance
in
elevated
temperature
environments
due
to
imbalanced
interplay
between
two
spectral
bands.
this
work,
meticulously
designed
sandwich‐structure
SiO
2
/C@SiC/SiO
composite
is
proposed
cope
with
challenge.
The
middle
layer
C@SiC
composites
possesses
excellent
microwave
absorption
even
high
temperatures.
outer
layers
aerogels
serve
not
only
inhibit
infrared
radiation
intensity,
but
also
reinforce
capacity
by
optimizing
impedance
matching
reducing
heat
transferred
layer.
Based
on
numerical
simulation
outcomes,
thickness
each
has
been
optimized
attain
harmonious
balance
properties.
Ultimately,
sandwich
structured
demonstrate
low
RL
(reflection
loss)
values
(←5
dB)
across
nearly
entire
X
band
(8–12
GHz),
alongside
minimal
surface
temperatures
hovering
≈44
°C
an
ambient
200
°C.
comprehensive
investigation
into
impact
patterns
underlying
mechanisms
offers
invaluable
insights
develop
for
high‐temperature
applications,
which
can
be
applied
coatings
skin
Mach
number
aircraft.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 29, 2024
Abstract
Thermochemical
conversion
is
a
highly
effective
method
for
upgrading
organic
solid
wastes
into
high‐value
materials,
contributing
to
carbon
neutrality
and
peak,
emission
goals.
It
also
serves
as
pathway
develop
energy‐efficient
electromagnetic
wave
absorbing
(EMWA)
materials.
In
this
study,
fish
skin
successfully
in
situ
nitrify
Prussian
Blue
Fe
3
N
under
external
thermal
driving
condition,
resulting
high
saturation
magnetization
utilized.
The
N@C
demonstrates
outstanding
EMWA
property,
achieving
minimum
reflection
loss
of
−71.3
dB.
Furthermore,
by
introducing
cellulose
nanofiber,
portion
the
iron
nitride
transformed
carbide,
C/Fe
N@C.
This
composite
exhibits
enhanced
properties
owing
wider
local
charge
redistribution
stronger
electronic
interactions,
an
absorption
bandwidth
(
EAB
)
6.64
GHz.
Electromagnetic
simulations
first‐principles
calculations
further
elucidate
mechanism,
maximum
reduction
value
radar‐cross
section
reached
37.34
dB·m
2
.
design
multilayer
gradient
metamaterials
demonstrated
ultra‐broadband
11.78
paper
presents
efficient
strategy
atomic‐level
biomass
waste
utilization
prepare
N,
provides
novel
insights
between
metal
nitrides
carbides,
offers
promising
direction
development
advanced
