MXene-based
thermal
camouflage
materials
have
gained
increasing
attention
due
to
their
low
emissivity,
however,
the
poor
anti-oxidation
restricts
potential
applications
under
complex
environments.
Various
modification
methods
and
strategies,
e.g.,
addition
of
antioxidant
molecules
fillers
been
developed
overcome
this,
but
realization
long-term,
reliable
using
MXene
network
(coating)
with
excellent
comprehensive
performance
remains
a
great
challenge.
Here,
hybrid
comodified
hyaluronic
acid
(HA)
hyperbranched
polysiloxane
(HSi)
is
designed
fabricated.
Notably,
presence
appreciated
HA
oxidation
sheets
without
altering
infrared
stealth
performance,
superior
other
water-soluble
polymers;
while
HSi
can
act
as
efficient
cross-linking
agents
generate
strong
interactions
between
molecules.
The
optimized
MXene/HA/HSi
composites
exhibit
mechanical
flexibility
(folded
into
crane
structure),
good
water/solvent
resistance,
long-term
stable
capability
(with
emissivity
≈0.29).
reliability
(≈8
months)
various
outdoor
weathers
scalable
coating
MXene-coated
textile
enable
them
disguise
IR
signal
targets
in
environments,
indicating
promise
achieved
material
for
camouflage,
stealth,
counter
surveillance.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(44)
Опубликована: Май 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.
ACS Nano,
Год журнала:
2023,
Номер
17(13), С. 12409 - 12421
Опубликована: Июнь 28, 2023
Mechano-optical
systems
with
on-demand
adaptability
and
a
broad
spectrum
from
the
visible
to
microwave
are
critical
for
complex
multiband
electromagnetic
(EM)
applications.
Most
existing
material
merely
have
dynamic
optical
or
tunability
because
their
EM
wave
response
is
strongly
wavelength-dependent.
Inspired
by
cephalopod
skin,
we
develop
an
adaptive
multispectral
mechano-optical
system
based
on
bilayer
acrylic
dielectric
elastomer
(ADE)/silver
nanowire
(AgNW)
films,
which
reconfigures
surface
morphology
between
wrinkles
cracks
via
mechanical
contraction
stretching.
Such
morphological
evolution
regulates
direct
transmission/reflection
scattering
behavior
of
visible-infrared
light
simultaneously
alters
conductive
network
in
AgNW
film
influence
its
characteristics.
The
designed
features
switching
visible-infrared-microwave
transparency
opacity,
continuous
regulation,
wide
spectral
window
(0.38-15.5
μm
24,200-36,600
μm),
excellent
recyclability
(500
times),
rapid
time
(<1
s).
These
grant
great
potential
as
platforms
various
promising
applications
such
smart
windows,
switchable
devices,
thermal
management,
visual
stealth,
human
motion
detection.
Microwave
absorbing
materials
(MAMs)
are
that
effectively
absorb
incident
electromagnetic
(EM)
wave
energy,
reducing
reflection
and
scattering.
They
play
a
crucial
role
in
enhancing
electronic
reliability,
healthcare,
defense
security.
However,
traditional
MAMs
like
ferrites,
magnetic
metals,
polymers
possess
certain
limitations,
including
low
impedance
matching,
narrow
absorption
bandwidth,
poor
chemical
stability,
high
filling
ratio,
which
hinder
their
further
development.
To
address
the
requirements
of
lightweight,
wideband,
high‐efficiency
absorption,
precise
structural
design
has
emerged
as
captivating
research
focus.
Additionally,
comprehending
structure
–
property
relationships
between
these
unique
microstructures
EM
response
loss
mechanisms
still
poses
significant
challenges.
Herein,
comprehensive
review
is
presented
with
varied
designs
encompassing
various
scales,
providing
detailed
introduction
relationship
potential
corresponding
characteristics
mechanisms.
Moreover,
theoretical
calculation
models,
characterization,
analysis
methods
discussed.
Finally,
article
proposes
challenges
prospects
for
development
absorbers.
