Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Sept. 9, 2024
Abstract
Porous
materials
emerging
as
potential
high‐efficiency
electromagnetic
(EM)
wave
absorbers
confront
a
critical
trade‐off
between
impedance
matching
and
attenuation
capability.
In
this
study,
versatile
strategy
is
reported
to
overcome
challenge
by
constructing
gradient
pores
via
solvent‐assisted
linker
exchange
for
the
fabrication
of
metal‐organic
framework
(MOF)
derived
Fe/Fe
3
Co
7
/Co/C
composites
with
high
porosity.
The
characteristics
single‐pored
gradient‐pored
derivatives
are
investigated
through
combined
experimental
simulation
approaches.
Simulated
space
EM
field,
loss
density,
Smith
charts
reveal
significantly
enhanced
interactions
optimized
within
pores.
Compared
individual
MOF
derivatives,
derivative
exhibits
improved
from
large‐pored
shell
superior
capability
small‐pored
core,
giving
rise
Pareto
improvement
in
absorption
strong
reflection
(−64.7
dB)
wide
effective
adsorption
bandwidth
(5.8
GHz)
at
thickness
2.5
mm.
This
work
not
only
advances
novel
pore
efficient
capability,
but
also
sheds
light
on
underlying
mechanisms
interaction
varied
porosity,
offering
insights
extended
designs
magnetic,
electric
optic
devices.
Nano Materials Science,
Journal Year:
2024,
Volume and Issue:
unknown
Published: July 1, 2024
Homogeneous
heterogeneous
(heterophase)
interfaces
regulated
with
low
energy
barriers
have
a
fast
response
to
applied
electric
fields
and
could
provide
unique
interfacial
polarization,
which
facilitate
the
transport
of
electrons
across
substrate.
Such
regulation
on
is
effective
in
modulating
electromagnetic
wave
absorbing
materials.
Herein,
we
construct
NbS2–NiS2
heterostructures
NiS2
nanoparticles
uniformly
grown
NbS2
hollow
nanospheres,
such
particular
structure
enhances
polarization.
The
strong
electron
transfer
at
interface
promotes
throughout
material,
results
less
scattering,
conduct
ion
loss
dielectric
polarization
relaxation,
improves
loss,
good
impedance
matching
material.
Consequently,
band
may
be
successful
tuned.
By
regulating
amount
NiS2,
finely
alternated
so
that
overall
wave-absorbing
performance
shifted
lower
frequencies.
With
content
15
wt%
an
absorber
thickness
1.84
mm,
minimum
reflection
14.56
GHz
−53.1
dB,
absorption
bandwidth
5.04
GHz;
more
importantly,
different
bands
−20
dB,
microwave
rate
reaches
99%
when
about
1.5–4.5
mm.
This
work
demonstrates
construction
homogeneous
improving
properties,
providing
guideline
for
synthesis
highly
efficient
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 5, 2025
Abstract
Metal‐organic
framework
(MOF)
derivatives
employed
as
novel
microwave‐absorbing
materials
(MAMs)
have
garnered
significant
attention
due
to
their
diverse
in
situ
or
ex
coordinated
components
and
the
flexibility
nano‐microstructure
fabrication.
A
well‐designed
heterointerface
can
provide
an
optimal
balance
between
impedance
high‐loss
capability.
However,
precisely
tuning
semiconductor‐metal‐carbon
heterostructures
remains
a
huge
challenge.
Herein,
multi‐component
NiS/Co
3
S
4
/NiCo@CNTs/NC
nanohybrid
with
hollow
structure
is
elaborately
fabricated
using
convenient
solvothermal
method
followed
by
high‐temperature
pyrolysis,
forming
unique
heterostructure
multiple
Schottky
contacts.
This
demonstrates
remarkable
reflection
loss
value
of
−75.9
dB
at
thickness
2.6
mm.
The
transcendent
microwave
absorption
(MA)
capacity
primarily
attributed
intense
polarization
relaxation
process
superb
impedance‐matching
properties
semiconductor/metal/carbon
hybrid
barriers.
In
addition,
built‐in
electric
field
established
heterointerfaces
increases
electron
transport
capabilities.
Notably,
controllable
introduction
numerous
defects
into
carbon
layer
intensifies
interfacial
effect
nanohybrid.
study
offers
innovative
insights
mechanisms
development
high‐performance
MAMs.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: Sept. 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
ACS Applied Polymer Materials,
Journal Year:
2024,
Volume and Issue:
6(12), P. 7288 - 7300
Published: June 6, 2024
Metal–organic
frameworks
(MOFs)
are
widely
applied
in
various
fields,
including
energy
storage,
drug
delivery,
wastewater
treatment,
and
much
more.
However,
their
use
hydrogels
is
limited
due
to
low
dispersion
which
causes
agglomeration
the
hydrogel
network
many
properties
of
sacrifices.
Similarly,
conductive
have
emerged
as
a
promising
material
for
skin-like
sensors
excellent
biocompatibility
mechanical
flexibility.
like
MOFs,
also
face
challenges
such
stretchability,
toughness,
susceptibility
fatigue,
resulting
sensing
range
large
response
time-reduced
durability
sensors.
In
this
study,
highly
stretchable,
tough,
antifatigue
composite
poly(dodecyl
methacrylate-acrylamide-2-(acryloyloxy)ethyl
trimethylammonium
chloride)
bimetallic
metal–organic
framework
[p(DA-AM-AETAC)BM-MOF]
was
developed
by
integrating
BM-MOFs
into
it.
To
achieve
uniform
within
network,
positively
charged
surfactant,
ethyl
hexadecyl
dimethylammonium
bromide,
used.
It
facilitates
formation
hydrophobic
interactions
between
matrix
surface
BM-MOFs.
Furthermore,
it
can
interact
with
surfactant
polymer
chains
through
physical
interactions,
significantly
enhancing
hydrogel.
The
BM-MOF-based
exhibited
impressive
stretchability
(1588%)
toughness
(537
kJ
m–3),
along
exceptional
properties.
Moreover,
demonstrated
high
conductivity
1.3
S/m
tensile
strain
sensitivity
ranging
from
0.5
700%
gauge
factor
14.8
at
response–recovery
195–145
ms.
p(DA-AM-AETAC)BM-MOF
displayed
sensitive,
reliable,
repetitive
detection
wide
human
activities,
wrist
elbow
rotation,
finger
bending,
swallowing
motion,
speaking,
well
handwriting
drawing.
monitor
pressure
mimic
skin.
This
highlights
potential
wearable
strain,
pressure,
artificial
skin
flexible
devices.
