Journal of Advanced Ceramics,
Год журнала:
2023,
Номер
12(10), С. 1902 - 1918
Опубликована: Авг. 17, 2023
High-entropy
MXenes,
as
a
new
emerging
class
of
materials,
possess
diverse
compositions,
unexpected
physicochemical
characteristics
and
great
potentials
for
electromagnetic
(EM)
wave
absorption.
Herein,
two
single-to-few-layer
high-entropy
(Mo0.25Cr0.25Ti0.25V0.25)3C2Tx
(Mo0.2Cr0.2Nb0.2Ti0.2V0.2)4C3Tx,
were
synthesized
the
first
time.
During
exfoliation
delamination
processes,
structural,
morphological
compositional
evolutions
analyzed,
verifying
successful
formation
two-dimensional
MXene
nanosheets.
Investigations
indicate
that
with
filling
content
only
35
wt%,
powders
filled
composites
exhibit
high-efficiency
EM
absorption
performances.
The
f-(Mo0.25Cr0.25Ti0.25V0.25)3C2Tx
possesses
minimum
reflection
loss
(RLmin)
-45.0
dB
matching
thickness
1.52
mm
maximum
effective
bandwidth
(EAB)
5.6
GHz
at
1.65
thickness.
Also,
f-(Mo0.2Cr0.2Nb0.2Ti0.2V0.2)4C3Tx
can
attain
RLmin
-52.8
1.58
an
optimum
EAB
value
3.6
1.50
mm.
satisfactory
efficiency
bandwidth,
thin
low
prove
lightweight
advantage
application
potential
MXenes
in
In
this
work,
strategy
is
applied
to
tune
performances
MXenes.
Furthermore,
engineering
expected
provide
control
tunability
many
other
properties,
such
electrochemical,
catalytic,
mechanical
behaviors.
Abstract
Stealth
technology
is
used
to
enhance
the
survival
of
military
equipment
in
field
surveillance,
as
it
utilizes
a
combination
techniques
render
itself
undetectable
by
enemy
radar
systems.
Radar
absorbing
materials
(RAMs)
are
specialized
reduce
reflection
(or
absorption)
signals
provide
stealth
capability,
which
core
component
passive
countermeasures
applications.
The
properties
RAMs
can
be
optimized
adjusting
their
composition,
microstructure,
and
surface
geometry.
Carbon‐based
present
promising
approach
for
fabrication
ultrathin,
versatile,
high‐performance
due
large
specific
area,
lightweight,
excellent
dielectric
properties,
high
electrical
conductivity,
stability
under
harsh
conditions.
This
review
begins
with
brief
history
an
introduction
electromagnetic
waves,
systems,
materials.
followed
discussion
recent
research
progress
carbon‐based
RAMs,
including
carbon
blacks,
fibers,
nanotubes,
graphite,
graphene,
MXene,
along
in‐depth
examination
principles
strategies
on
attenuation
characteristics.
Hope
this
will
offer
fresh
perspectives
design
thereby
fostering
deeper
fundamental
understanding
promoting
practical
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Фев. 28, 2024
Abstract
Rational
manipulation
of
composition
and
microstructure
design
is
recognized
as
an
effective
pathway
to
realize
multifunctional
high‐performance
microwave
absorber.
In
this
work,
necklace‐like
hollow
polyacrylonitrile
(PAN)/carbon
nanofibers
are
designed
constructed
through
a
simple
continuous
electrospinning‐carbonization‐etching
route.
Specifically,
by
varying
the
carbonization
temperature,
ratio
PAN
carbon
content
PAN/carbon
can
be
effectively
regulated,
resulting
in
tunable
electromagnetic
parameters
conductive
loss
capacities.
After
that,
structure
further
introduced
improve
feature
lightweight,
impedance‐matching
characteristics,
interfacial
polarization
ability.
Accordingly,
exhibited
frequency
bandwidth
6.60
GHz
minimum
reflection
−44.73
dB
at
1.76
mm.
Both
experimental
theoretical
simulation
results
indicated
that
obtained
possessed
high
chemical
stability
excellent
absorbing
performance,
endowing
them
candidates
for
absorbers
extreme
conditions.
Therefore,
findings
not
only
offered
rationally
manipulate
but
also
provided
novel
technique
make
most
engineering
strengthening
interface
loss.
Nano-Micro Letters,
Год журнала:
2023,
Номер
15(1)
Опубликована: Июль 10, 2023
Wearable
devices
with
efficient
thermal
management
and
electromagnetic
interference
(EMI)
shielding
are
highly
desirable
for
improving
human
comfort
safety.
Herein,
a
multifunctional
wearable
carbon
fibers
(CF)
@
polyaniline
(PANI)
/
silver
nanowires
(Ag
NWs)
composites
"branch-trunk"
interlocked
micro/nanostructure
were
achieved
through
"three-in-one"
multi-scale
design.
The
reasonable
assembly
of
the
three
kinds
one-dimensional
(1D)
materials
can
fully
exert
their
excellent
properties
i.e.,
superior
flexibility
CF,
robustness
PANI,
splendid
conductivity
AgNWs.
Consequently,
constructed
flexible
composite
demonstrates
enhanced
mechanical
tensile
stress
1.2
MPa,
which
was
almost
6
times
that
original
material.
This
is
mainly
attributed
to
fact
PNAI
(branch)
firmly
attached
CF
(trunk)
polydopamine
(PDA),
forming
robust
structure.
Meanwhile,
possesses
insulation
heat
preservation
capacity
owing
synergistically
low
emissivity.
More
importantly,
conductive
path
established
by
1D
greatly
improved
its
EMI
property
Joule
heating
performance
at
applied
voltage.
work
paves
way
rational
utilization
intrinsic
materials,
as
well
provides
promising
strategy
designing
protection
energy
devices.
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.
Chemical Society Reviews,
Год журнала:
2023,
Номер
52(21), С. 7389 - 7460
Опубликована: Янв. 1, 2023
This
review
provides
a
comprehensive
overview
of
photothermal
regulation
strategies
from
fundamentals,
criteria,
and
advanced
materials
to
emerging
applications.
