Nano-Micro Letters,
Год журнала:
2023,
Номер
16(1)
Опубликована: Ноя. 17, 2023
Abstract
Carbon-based
aerogels
derived
from
biomass
chitosan
are
encountering
a
flourishing
moment
in
electromagnetic
protection
on
account
of
lightweight,
controllable
fabrication
and
versatility.
Nevertheless,
developing
facile
construction
method
component
design
with
carbon-based
for
high-efficiency
wave
absorption
(EWA)
materials
broad
effective
bandwidth
(EAB)
strong
yet
hits
some
snags.
Herein,
the
nitrogen-doped
magnetic-dielectric-carbon
aerogel
was
obtained
via
ice
template
followed
by
carbonization
treatment,
homogeneous
abundant
nickel
(Ni)
manganese
oxide
(MnO)
particles
situ
grew
carbon
aerogels.
Thanks
to
optimization
impedance
matching
dielectric/magnetic
components
aerogels,
(Ni/MnO-CA)
suggests
praiseworthy
EWA
performance,
an
ultra-wide
EAB
7.36
GHz
minimum
reflection
loss
(RL
min
)
−
64.09
dB,
while
achieving
specific
253.32
dB
mm
−1
.
Furthermore,
reveals
excellent
radar
stealth,
infrared
thermal
management
capabilities.
Hence,
high-performance,
easy
fabricated
multifunctional
nickel/manganese
oxide/carbon
have
application
aspects
protection,
electronic
devices
aerospace.
Advanced Materials,
Год журнала:
2023,
Номер
35(11)
Опубликована: Янв. 6, 2023
High-entropy
oxides
(HEOs),
which
incorporate
multiple-principal
cations
into
single-phase
crystals
and
interact
with
diverse
metal
ions,
extend
the
border
for
available
compositions
unprecedented
properties.
Herein,
a
high-entropy-stabilized
(Ca0.2
Sr0.2
Ba0.2
La0.2
Pb0.2
)TiO3
perovskite
is
reported,
effective
absorption
bandwidth
(90%
absorption)
improves
almost
two
times
than
that
of
BaTiO3
.
The
results
demonstrate
regulation
entropy
configuration
can
yield
significant
grain
boundaries,
oxygen
defects,
an
ultradense
distorted
lattice.
These
characteristics
give
rise
to
strong
interfacial
defect-induced
polarizations,
thus
synergistically
contributing
dielectric
attenuation
performance.
Moreover,
large
strains
derived
from
lattice
distortions
in
high-entropy
offer
varied
transport
electron
carriers.
high-entropy-enhanced
positive/negative
charges
accumulation
around
boundaries
strain-concentrated
location,
quantitatively
validated
by
holography,
unusual
polarization
loss.
This
study
opens
up
avenue
designing
microwave
materials
satisfy
increasingly
demanding
requirements
advanced
integrated
electronics.
work
also
offers
paradigm
improving
other
interesting
properties
HEOs
through
engineering.
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(16)
Опубликована: Фев. 7, 2023
Abstract
The
rational
design
of
magnetic
composites
has
great
potential
for
electromagnetic
(EM)
absorption,
particularly
in
the
low‐frequency
range
2–8
GHz.
However,
scalable
synthesis
such
absorbers
with
both
high
content
and
good
dispersity
remains
challenging.
In
this
study,
a
confined
diffusion
strategy
is
proposed
to
fabricate
functional
magnetic‐carbon
hollow
microspheres.
Driven
by
ferromagnetic
enhanced
Kirkendall
effect,
situ
alloying
FeCo
nanoparticles
tightly
carbon
shells,
effectively
inhibiting
agglomeration.
Moreover,
core–shell
FeCo–carbon
nano‐units
further
assemble
into
dispersive
microscale
Janus
bulges
on
inner
outer
surfaces
microsphere.
optimized
FeCo@C
microspheres
exhibit
excellent
EM
wave
absorption
performance:
minimum
reflection
loss
(
RL
min
)
−35.9
dB,
bandwidth
covers
almost
entire
C‐band.
Systematic
investigation
reveals
that
large
size
integration,
high–density
units,
strong
coupling
are
essential
enhancing
dissipation
waves.
This
study
provides
novel
fabricating
advanced
significant
inspiration
investigating
attenuation
mechanism
at
low
frequency.
Nano-Micro Letters,
Год журнала:
2022,
Номер
14(1)
Опубликована: Авг. 20, 2022
Rational
designing
of
one-dimensional
(1D)
magnetic
alloy
to
facilitate
electromagnetic
(EM)
wave
attenuation
capability
in
low-frequency
(2-6
GHz)
microwave
absorption
field
is
highly
desired
but
remains
a
significant
challenge.
In
this
study,
composite
EM
absorber
made
FeCoNi
medium-entropy
embedded
1D
carbon
matrix
framework
rationally
designed
through
an
improved
electrospinning
method.
The
1D-shaped
demonstrates
the
high-density
and
continuous
network
using
off-axis
electronic
holography
technique,
indicating
excellent
loss
ability
under
external
field.
Then,
in-depth
analysis
shows
that
many
factors,
including
anisotropy
intrinsic
physical
features
alloy,
primarily
contribute
enhanced
performance.
Therefore,
fabricated
increasing
effective
band
1.3
GHz
at
ultrathin
thickness
2
mm.
Thus,
study
opens
up
new
method
for
design
preparation
high-performance
absorbers.
MXene
nanomaterials
stand
out
among
2D
and
have
been
extensively
studied
by
researchers
because
of
their
unique
layered
structure,
chemical
diversity,
outstanding
physical
properties.
In
recent
years,
materials
rapidly
opened
the
market
for
electromagnetic
interference
shielding
technology
due
to
excellent
wave
absorption
(EMA)
capability.
However,
so
far,
compared
with
development
(EM)
technology,
there
is
still
much
room
in
construction
MXenes
application
absorption.
Herein,
strategies,
conversion
mechanism,
applications
are
reviewed.
Through
meticulous
material
design
an
interdisciplinary
approach,
expected
become
one
smart
tunable
absorbers,
scenarios
will
also
broader.
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Апрель 8, 2023
Harvesting
largely
ignored
and
wasted
electromagnetic
(EM)
energy
released
by
electronic
devices
converting
it
into
direct
current
(DC)
electricity
is
an
attractive
strategy
not
only
to
reduce
EM
pollution
but
also
address
the
ever-increasing
crisis.
Here
we
report
synthesis
of
nanoparticle-templated
graphene
with
monodisperse
staggered
circular
nanopores
enabling
EM-heat-DC
conversion
pathway.
We
experimentally
theoretically
demonstrate
that
this
nanoporous
structure
alters
graphene's
phononic
properties
synergistically
manipulating
its
intralayer
nanostructures
interlayer
interactions.
The
exhibits
anomalous
combination
properties,
which
lead
efficient
absorption
waves
heat
in
turn
output
DC
through
thermoelectric
effect.
Overall,
our
results
advance
fundamental
understanding
structure-property
relationships
ordered
graphene,
providing
effective
generate
electric
energy.
Sensors,
Год журнала:
2023,
Номер
23(4), С. 2204 - 2204
Опубликована: Фев. 15, 2023
This
paper
reviews
recent
advances
in
sensor
technologies
for
non-destructive
testing
(NDT)
and
structural
health
monitoring
(SHM)
of
civil
structures.
The
article
is
motivated
by
the
rapid
developments
data
analytics
leading
to
ever-advancing
systems
assessing
Conventional
advanced
are
systematically
reviewed
evaluated
context
providing
input
parameters
NDT
SHM
their
suitability
determine
state
presented
sensing
selected
based
on
capabilities,
reliability,
maturity,
affordability,
popularity,
ease
use,
resilience,
innovation.
A
significant
focus
placed
evaluating
associated
analytics,
highlighting
limitations,
advantages,
disadvantages.
presents
techniques
such
as
fiber
optics,
laser
vibrometry,
acoustic
emission,
ultrasonics,
thermography,
drones,
microelectromechanical
(MEMS),
magnetostrictive
sensors,
next-generation
technologies.
In
order
to
achieve
excellent
electromagnetic
wave
(EMW)
absorption
properties,
the
microstructure
design
and
component
control
of
absorber
are
critical.
this
study,
three
different
structures
made
Mo2
C/C
hollow
spheres
prepared
their
microwave
behavior
is
investigated.
The
double-shell
consisting
an
outer
thin
shell
inner
rough
thick
with
multiple
EMW
loss
mechanisms
exhibit
good
properties.
further
improve
MoC1-x
/C
crystalline
phases
molybdenum
carbide
optimize
capability
materials.
Finally,
α-phase
have
best
When
filling
20
wt.%,
minimum
reflection
at
1.8
mm
-50.55
dB
effective
bandwidth
2
5.36
GHz,
which
expected
be
a
characteristics
"thin,
light,
wide,
strong".
Advanced Functional Materials,
Год журнала:
2022,
Номер
32(33)
Опубликована: Июнь 8, 2022
Abstract
Severe
lower‐frequency
(2–8
GHz)
microwave
pollution
caused
by
the
rapid
development
of
5th
generation
(5G)
communication
posts
significance
on
cutting‐edge
absorbers.
However,
intensely
coupled
wave‐impedance
and
dissipating
ability
dramatically
hinder
their
performance
in
exact
range.
The
rationally
designed
heterostructure
hard/soft
ferrite
composite
provides
an
efficient
solution
to
address
issue.
In
this
context,
core‐shell
structured
BaFe
(12‐x)
Co
x
O
19
@Fe
3
4
with
abundant
heterointerface
is
created
using
facile
spray‐drying
subsequent
solvothermal
approach,
where
hard
magnetic
serves
as
core
soft
Fe
shell,
respectively.
unique
integration
contributes
sufficient
exchange
coupling
interaction
for
strong
loss
beyond
Snoek's
limitation,
which
considerably
boosts
a
absorption.
Accordingly,
minimum
reflection
(RL
min
)
typical
11.6
0.4
microcomposite
reaches
−
48.9
dB
at
thickness
3.5
mm,
its
bandwidth
<
10
can
cover
almost
all
S
C
bands
(2.6–8
GHz).
Generally,
easy
controllable
pathway
conveyed
work
encourage
improved
well
decouple
composites,
widens
road
advanced
