Carbon,
Journal Year:
2024,
Volume and Issue:
227, P. 119244 - 119244
Published: May 13, 2024
Electromagnetic
waves
constitute
an
essential
element
of
societal
progress,
and
the
environmental
impact
resulting
from
using
electromagnetic
warrants
significant
considerations.
Carbon
materials
have
garnered
considerable
attention
in
functional
domain
owing
to
their
remarkable
electrical
conductivity
dielectric
characteristics.
Notably,
spherical
carbon
materials,
characterized
by
substantial
specific
surface
area
tunable
properties,
emerged
as
efficient
additives
for
microwave
absorbers.
These
excel
absorbing
energy
while
minimizing
dissipation.
When
incorporated
into
absorbers
varying
compositions,
sizes,
morphologies,
these
spheres
facilitate
synergistic
operation
multiple
loss
mechanisms,
containing
conductive
loss,
magnetic
polarization
loss.
This
concerted
action
significantly
enhances
wave
absorption
performance.
paper
offers
a
comprehensive
review
advancements
sphere-based
designed
waves.
It
also
furnishes
intricate
exposition
methodologies
employed
preparation
meticulous
analysis
The
summarizes
microstructural
attributes
mechanisms
governing
various
sphere
configurations,
considering
factors
such
composition,
morphology,
size,
structure.
In
conclusion,
this
study
forecasts
potentials
nanomaterials
realm
waves,
along
with
assessment
forthcoming
research
focal
points
conceivable
challenges.
Nano-Micro Letters,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: Aug. 9, 2023
Two-dimensional
transition
metal
carbides
and
nitrides
(MXene)
have
emerged
as
promising
candidates
for
microwave
absorption
(MA)
materials.
However,
they
also
some
drawbacks,
such
poor
impedance
matching,
high
self-stacking
tendency,
density.
To
tackle
these
challenges,
MXene
nanosheets
were
incorporated
into
polyacrylonitrile
(PAN)
nanofibers
subsequently
assembled
a
three-dimensional
(3D)
network
structure
through
PAN
carbonization,
yielding
MXene/C
aerogels.
The
3D
effectively
extends
the
path
of
microcurrent
transmission,
leading
to
enhanced
conductive
loss
electromagnetic
(EM)
waves.
Moreover,
aerogel's
rich
pore
significantly
improves
matching
while
reducing
density
MXene-based
absorbers.
EM
parameter
analysis
shows
that
aerogels
exhibit
minimum
reflection
(RLmin)
value
-
53.02
dB
(f
=
4.44
GHz,
t
3.8
mm),
an
effective
bandwidth
(EAB)
5.3
GHz
(t
2.4
mm,
7.44-12.72
GHz).
Radar
cross-sectional
(RCS)
simulations
employed
assess
radar
stealth
effect
aerogels,
revealing
maximum
RCS
reduction
perfect
electric
conductor
covered
by
aerogel
reaches
12.02
m2.
In
addition
MA
performance,
demonstrates
good
thermal
insulation
5-mm-thick
can
generate
temperature
gradient
over
30
°C
at
82
°C.
This
study
provides
feasible
design
approach
creating
lightweight,
efficient,
multifunctional
Advanced Functional Materials,
Journal Year:
2022,
Volume and Issue:
33(7)
Published: Nov. 30, 2022
Abstract
Nanocarbons
with
single‐metal
atoms
(M‐SAs)
have
displayed
considerable
potential
in
various
fields
of
application
due
to
high
free
energy
M‐SAs
and
strong
metal‐support
interaction.
However,
the
uniform
dispersion
within
whole
carbon
matrix
still
remains
a
great
challenge.
Herein,
Ni‐SAs
are
uniformly
dispersed
hierarchically
porous
nanoflowers
(Ni‐SA/HPCF)
via
spatial
confinement
Ni
ions
periodic
pores
metal‐organic
frameworks
(MOFs)
subsequent
carbonization
process.
The
Ni‐SA/HPCF
abundant
mesopores
an
ultrahigh
surface
area
(1137.2
m
2
g
−1
)
exhibits
unexpected
electromagnetic
wave
(EMW)
absorption
property
minimal
reflection
loss
–53.2
dB
effective
bandwidth
5.0
GHz,
while
filler
ratio
is
merely
10
wt.%.
Density
functional
theory
calculations
experimental
results
reveal
that
break
local
symmetry
electronic
structure
increase
electrical
conductivity
host
matrix,
thereby
enhancing
EMW
properties.
In
addition,
unique
3D
hierarchical
morphology
boosts
impedance
matching
property,
which
synergistically
improves
performance
Ni‐SA/HPCF.
This
study
provides
efficient
approach
disperse
nanocarbons
for
other
applications.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
36(14)
Published: Dec. 26, 2023
Abstract
Transition
metal
carbides/nitrides
(MXenes)
demonstrate
a
massive
potential
in
constructing
lightweight,
multifunctional
wearable
electromagnetic
interference
(EMI)
shields
for
application
various
fields.
Nevertheless,
it
remains
challenging
to
develop
facile,
scalable
approach
prepare
the
MXene‐based
macrostructures
characterized
by
low
density,
thickness,
high
mechanical
flexibility,
and
EMI
SE
at
same
time.
Herein,
ultrathin
MXene/reduced
graphene
oxide
(rGO)/Ag
foams
with
porifera‐inspired
hierarchically
porous
microstructure
are
prepared
combining
Zn
2+
diffusion
induction
hard
template
methods.
The
hierarchical
porosity,
which
includes
mesoporous
skeleton
microporous
MXene
network
within
skeleton,
not
only
exerts
regulatory
effect
on
stress
distribution
during
compression,
making
rubber‐like
resistant
wrinkling
but
also
provides
more
channels
multiple
reflections
of
waves.
Due
interaction
between
Ag
nanosheets,
MXene/rGO,
structure,
is
possible
produce
an
outstanding
shielding
performance
specific
surface
effectiveness
reaching
109152.4
dB
cm
2
g
−1
.
Furthermore,
exhibit
multifunctionalities,
such
as
transverse
Joule
heating,
longitudinal
heat
insulation,
self‐cleaning,
fire
resistance,
motion
detection.
These
discoveries
open
up
novel
pathway
development
lightweight
materials
considerable
anti‐interference
devices.
Nano-Micro Letters,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: July 7, 2023
Highlights
Convincing
candidates
of
flexible
(stretchable/compressible)
electromagnetic
interference
shielding
nanocomposites
are
discussed
in
detail
from
the
views
fabrication,
mechanical
elasticity
and
performance.
Detailed
summary
relationship
between
deformation
materials
The
future
directions
challenges
developing
(particularly
elastic)
highlighted.
Abstract
With
extensive
use
electronic
communication
technology
integrated
circuit
systems
wearable
devices,
(EMI)
has
increased
dramatically.
shortcomings
conventional
rigid
EMI
include
high
brittleness,
poor
comfort,
unsuitability
for
conforming
deformable
applications.
Hitherto,
have
attracted
enormous
interest
due
to
their
excellent
deformability.
However,
current
present
low
stability
resilience,
relatively
performance,
limited
multifunctionality.
Herein,
advances
low-dimensional
nanomaterials-based
elastomers
outlined
a
selection
most
remarkable
examples
is
discussed.
And
corresponding
modification
strategies
deformability
performance
summarized.
Finally,
expectations
this
quickly
increasing
sector
discussed,
as
well
challenges.
Nano-Micro Letters,
Journal Year:
2023,
Volume and Issue:
15(1)
Published: March 15, 2023
Abstract
Since
the
discovery
in
2011,
MXenes
have
become
rising
star
field
of
two-dimensional
materials.
Benefiting
from
metallic-level
conductivity,
large
and
adjustable
gallery
spacing,
low
ion
diffusion
barrier,
rich
surface
chemistry,
superior
mechanical
strength,
exhibit
great
application
prospects
energy
storage
conversion,
sensors,
optoelectronics,
electromagnetic
interference
shielding
biomedicine.
Nevertheless,
two
issues
seriously
deteriorate
further
development
MXenes.
One
is
high
experimental
risk
common
preparation
methods
such
as
HF
etching,
other
difficulty
obtaining
with
controllable
groups.
Recently,
Lewis
acidic
a
brand-new
strategy
for
MXenes,
has
attracted
intensive
attention
due
to
its
safety
ability
endow
uniform
terminations.
However,
comprehensive
review
etching
method
not
been
reported
yet.
Herein,
we
first
introduce
following
four
aspects:
mechanism,
terminations
regulation,
in-situ
formed
metals
delamination
multi-layered
Further,
applications
MXene-based
hybrids
obtained
by
route
sensors
microwave
absorption
are
carefully
summarized.
Finally,
some
challenges
opportunities
also
presented.
