ACS Applied Nano Materials,
Journal Year:
2024,
Volume and Issue:
7(8), P. 8926 - 8938
Published: April 11, 2024
Here,
composites
filled
with
carbon
nanospheres
of
different
morphologies
exhibit
the
same
electromagnetic
wave
(EMW)
absorption
and
loss
mechanisms
when
they
possess
content.
Conductive
is
their
primary
EMW
absorbing
mechanism,
while
effect
polarization
can
be
ignored
entirely.
Composites
a
filling
amount
lower
than
percolation
threshold
certain
conductivity
excellent
behavior,
close
to
or
higher
reveal
outstanding
EM
interference
(EMI)
shielding.
The
minimum
reflection
(RLmin)
maximum
effective
bandwidth
(EABmax)
mesoporous
hollow
(MCHS)
reach
−50.52
dB
5.90
GHz
at
an
ultralow
3
wt
%.
EMI
shielding
effectiveness
(SE)
MCHS
as
high
118.23
fill
level
12
%,
average
SE
84.50
dB.
Among
them,
conductive
has
more
significant
contribution
low-frequency
absorption.
Frequency-selective
performance
obtained
by
simply
adjusting
material
conductivity.
Compared
currently
reported
nanomaterials,
in
this
study
advantages
EM-resisting
performances
unique
low-filling
characteristics.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
34(9)
Published: Nov. 14, 2023
Abstract
Optimization
of
components
and
micromorphology
regulation
are
shown
to
be
effective
in
boosting
electromagnetic
wave
absorption
(EMWA).
One
approach
achieve
this
enhancement
is
by
utilizing
the
polarization
effects
heterogeneous
interfaces.
Herein,
NiSe
2
‐CoSe
@C@MoSe
composites
derived
from
NiCo‐MOF‐74
fabricated
via
a
facile
selenization
reaction
subsequent
hydrothermal
method.
By
varying
mass
ratios
@C
MoSe
,
series
with
hierarchical
flower‐like
core–shell
structures
obtained.
The
EMWA
properties
display
trend
initially
increasing
then
decreasing
content
.
Interestingly,
when
ratio
3:2,
minimum
reflection
loss
(RL)
value
−50.10
dB
an
bandwidth
(RL<
−10
dB)
can
reach
4.80
GHz
(13.20–18.00
GHz).
remarkable
capability
ascribed
synergy
conductive
loss,
suitable
impedance
matching.
This
work
establishes
new
pathway
for
synthesis
transition
metal
dichalcogenides‐based
composites,
which
hold
great
promise
as
high‐performance
materials
applications.
Engineered Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Jan. 1, 2024
Rose-derived
porous
carbon
and
Cobalt(Co)/Nickel(Ni)
nanoparticles
composite
absorbers
(RC/Co
RC/Ni)
were
synthesized
adopting
a
simple
impregnation
method
one-step
carbonization
method.The
special
array
structure
on
the
surface
of
rose
petals
remains
intact
even
after
carbonization,
wrinkles
inside
serves
to
reduce
material's
density
increase
number
interfaces.Besides,
in
Situ
Fabricated
Co
Ni
magnetic
employed
introduce
loss
ability.At
matching
thickness
1.58
mm,
RC/Co
exhibits
minimum
reflection
(RLmin)
-47.89
dB
at
13.60
GHz
an
effective
attenuation
bandwidth
(EABW)
4.08
GHz,
while
RC/Ni
achieves
RLmin
value
-45.36
12.88
EABW
3.02
1.56
mm.Due
low-cost
biomass
materials
preparation
methods,
could
serve
as
model
for
synthesizing
other
high-performance
due
their
environmental
friendliness,
convenience
synthesis,
good
EMW
capability.
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.
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
Small,
Journal Year:
2024,
Volume and Issue:
20(27)
Published: Feb. 13, 2024
Abstract
The
development
of
composites
with
highly
efficient
microwave
absorption
(MA)
performance
deeply
depends
on
polarization
loss,
which
can
be
induced
by
charge
redistribution.
Considering
the
fact
that
centers
easily
obtained
in
graphene,
herein,
iron
phthalocyanine
(FePc)
is
used
as
site
to
coordinate
nitrogen‐doped
graphene
(FePc/N‐rGO)
optimize
MA
comprehensively.
factors
influencing
properties
focus
interaction
between
FePc
and
N‐rGO,
change
dipole
moments.
density
functional
theory
(DFT)
results
demonstrated
has
strong
N
defect
sites
graphene.
loss
for
accumulation
N‐rGO
occurred,
leading
great
increase
moment,
increased
moment
acted
a
descriptor
evaluate
enhanced
loss.
Due
high
redistribution
capacity
centers,
FePc/N‐rGO
showed
excellent
C
band,
minimum
reflection
value
reach
−49.3
dB
at
5.4
GHz
thickness
3.8
mm.
In
addition,
fabric
loaded
good
heat
dissipation
property.
This
work
opens
door
bound
moment.
