Nano-Micro Letters,
Год журнала:
2024,
Номер
17(1)
Опубликована: Сен. 27, 2024
Abstract
Defects-rich
heterointerfaces
integrated
with
adjustable
crystalline
phases
and
atom
vacancies,
as
well
veiled
dielectric-responsive
character,
are
instrumental
in
electromagnetic
dissipation.
Conventional
methods,
however,
constrain
their
delicate
constructions.
Herein,
an
innovative
alternative
is
proposed:
carrageenan-assistant
cations-regulated
(CACR)
strategy,
which
induces
a
series
of
sulfides
nanoparticles
rooted
situ
on
the
surface
carbon
matrix.
This
unique
configuration
originates
from
strategic
vacancy
formation
energy
strong
sulfides-carbon
support
interaction,
benefiting
construction
defects-rich
heterostructures
M
x
S
y
/carbon
composites
(M-CAs).
Impressively,
these
generated
sulfur
vacancies
firstly
found
to
strengthen
electron
accumulation/consumption
ability
at
and,
simultaneously,
induct
local
asymmetry
electronic
structure
evoke
large
dipole
moment,
ultimately
leading
polarization
coupling,
i.e.,
defect-type
interfacial
polarization.
Such
“Janus
effect”
(Janus
effect
means
versatility,
Greek
two-headed
Janus)
intuitively
confirmed
by
both
theoretical
experimental
investigations
for
first
time.
Consequently,
vacancies-rich
heterostructured
Co/Ni-CAs
displays
broad
absorption
bandwidth
6.76
GHz
only
1.8
mm,
compared
vacancies-free
CAs
without
any
dielectric
response.
Harnessing
heterostructures,
this
one-pot
CACR
strategy
may
steer
design
development
advanced
nanomaterials,
boosting
functionality
across
diverse
application
domains
beyond
Nano-Micro Letters,
Год журнала:
2024,
Номер
17(1)
Опубликована: Сен. 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.
Modern
detection
technology
has
driven
camouflage
toward
multispectral
compatibility
and
dynamic
regulation.
However,
developing
such
stealth
technologies
is
challenging
due
to
different
frequency-band
principles.
Here,
this
work
proposes
a
design
concept
for
fluid-actuated
compatible
smart
device
that
employs
deformable
mechanochromic
layer/elastomer
with
channeled
dielectric
layer.
After
fluid
actuation,
the
elastomer
layer
transmits
mechanical
strain
layer,
thereby
altering
visible
reflectance
wavelengths
in
[568,
699]
nm.
Concurrently,
pumped-in
liquid
reconfigures
spatial
structure
parameter
alter
microwave
resonance
diffraction
radar
absorption,
enabling
absorption
significant
broadband
at
[8.16,
18.0]
GHz.
Using
heat-absorption
property
also
achieves
infrared
stealth,
shown
by
ΔT
≈
16.5
°C
temperature
difference.
Additionally,
exhibits
rapid
response
time
(∼1
s),
excellent
cycling
performance
(100
cycles),
programmability
(10
codes),
offering
new
strategy.
Langmuir,
Год журнала:
2024,
Номер
40(23), С. 12148 - 12158
Опубликована: Май 28, 2024
During
the
past
decade,
ever-increasing
electromagnetic
pollution
has
excited
a
global
concern.
A
sustainable
resource,
facile
experimental
scenario,
fascinating
reflection
loss
(RL),
and
broad
efficient
bandwidth
are
substantial
factors
that
intrigue
researchers.
This
research
led
to
achievement
of
brilliant
microwave-absorbing
material
by
treating
pampas
as
biomass.
The
carbon-based
microfibers
attained
biowaste
were
treated
plasma
under
diverse
environments
amplify
their
features.
Moreover,
pyrolysis
scenario
was
performed
compare
results.
reductive
processes
H2
carbonization.
However,
CO2
regulate
heteroatoms
defects.
Interestingly,
polystyrene
(PS)
applied
matrix.
aromatic
rings
existing
in
absorbing
medium
establish
electrostatic
interactions,
elevating
interfacial
polarization,
physical
characteristics
PS
augment
practical
applications
final
product.
manipulated
biomasses
characterized
Raman,
X-ray
diffraction,
energy-dispersive
spectroscopy,
field
emission
scanning
electron
microscopy,
diffuse
spectroscopy
analyses.
Eventually,
features
estimated
vector
network
analyzer.
plasma-treated
H2/Ar
blended
with
gained
maximum
RL
−90.65
dB
at
8.79
GHz
an
(RL
≤
−10
dB)
4.24
thickness
3.20
mm;
meanwhile,
treatment
97.99
14.92
7.74
2.05
mm
thickness.
Particularly,
biomass
plasmolyzed
Ar
covered
entire
X
Ku
bands
2.10
mm.
Notably,
total
shielding
efficiencies
bioinspired
materials
up
≈99%,
desirable
for
applications.
