Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 16, 2025
The
development
of
diverse
microstructures
has
substantially
contributed
to
recent
progress
in
high-performance
electromagnetic
wave
(EMW)
absorption
materials,
providing
a
versatile
platform
for
the
modulation
properties.
Exploring
multidimensional
and
developing
tailored
gentle
strategies
their
precise
optimization
can
address
current
challenges
posed
by
relatively
unclear
underlying
mechanisms.
Here,
series
2D/1D
heterogeneous
NiO@PPy
composites
featuring
hollow
hierarchical
are
successfully
synthesized
using
straightforward
strategy
combining
sacrificial
templating
with
chemical
oxidative
polymerization.
This
offers
facile
effective
approach
fine-tune
microstructure
adjusting
thickness
polypyrrole
(PPy)
coating.
enables
continuous
dielectric
properties
specific
maximize
EMW
absorption.
Remarkably,
optimized
composite
demonstrates
an
ultrathin
2.3
mm,
wide
band
spanning
5.89
GHz,
strong
intensity
-71.65
dB
at
minimal
loading
only
10
wt.%.
proposed
mild
controllable
preparation
not
provides
insights
further
tailoring
optimal
structures
enhance
capacity,
but
also
enriches
exploration
mechanisms
from
perspective
regulation.
Catalysts,
Journal Year:
2025,
Volume and Issue:
15(3), P. 200 - 200
Published: Feb. 20, 2025
The
specific
surface
area,
porosity,
and
mechanical
properties
of
a
catalyst
are
critical
factors
that
significantly
influence
its
performance.
However,
conventional
preparation
techniques
incapable
optimizing
these
simultaneously.
Here,
we
present
the
performance
three
kinds
catalysts
with
different
geometric
structures.
Our
findings
indicated
3D-printed
achieved
an
optimal
balance,
exhibiting
enhanced
catalytic
efficiency
integrity
compared
to
commercial
catalysts.
Furthermore,
excellent
ductility
metal
supports
effectively
prevented
pulverization
caused
by
carbon
deposition
thermal
expansion
supports.
These
results
demonstrate
3D
printing
technology
can
open
up
novel
avenues
for
preparation,
especially
metal-supported
potential
additive
manufacturing
in
chemical
engineering
is
substantial,
promising
transformative
advancements
design
fabrication
converters
reactors.
For
adapting
to
the
complex
electromagnetic
environment,
developing
materials
with
tunable
morphology
enabling
broadband
wave
(EMW)
absorption
is
undoubtedly
a
challenging
task.
In
this
work,
Y2O3/Ni@
N-doped
carbon
(YNC)
composites
were
prepared
by
solvothermal
method
and
high-temperature
carbonization
using
metal-organic
frameworks
(MOFs)
as
raw
materials.
By
adjusting
molar
ratio
of
Y3+/Ni2+,
changed
from
microsphere
spiky
microspheres,
then
dumbbell-shape,
different
morphologies
achieved
tune
impedance
matching.
Especially,
microspheres
exhibited
stronger
EMW
performance
than
other
morphologies.
When
Y3+/Ni2+
was
3:7,
minimum
reflection
loss
YNC
reached
−64.74
dB
at
25
wt%
filling
ratio.
At
thickness
2.02
mm,
effective
bandwidth
value
6.56
GHz
(11.44−18.00
GHz),
covering
entire
Ku
band.
Notably,
controllable
matching
porous
structure
in
multiple
bands
(C,
X,
Ku).
The
superior
attributed
composites,
achieving
balance
attenuation
capacity.
Furthermore,
presence
magnetic
Ni
nanoparticles
provided
capability
for
composites.
Density
functional
theory
indicated
that
formation
heterostructures
boosted
carrier
mobility,
facilitating
electron
transfer
across
interfaces,
thus
increasing
interfacial
polarization.
Therefore,
study
offered
novel
approach
designing
rare-earth
based
MOFs
derived
absorbers
capability.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 16, 2025
The
development
of
diverse
microstructures
has
substantially
contributed
to
recent
progress
in
high-performance
electromagnetic
wave
(EMW)
absorption
materials,
providing
a
versatile
platform
for
the
modulation
properties.
Exploring
multidimensional
and
developing
tailored
gentle
strategies
their
precise
optimization
can
address
current
challenges
posed
by
relatively
unclear
underlying
mechanisms.
Here,
series
2D/1D
heterogeneous
NiO@PPy
composites
featuring
hollow
hierarchical
are
successfully
synthesized
using
straightforward
strategy
combining
sacrificial
templating
with
chemical
oxidative
polymerization.
This
offers
facile
effective
approach
fine-tune
microstructure
adjusting
thickness
polypyrrole
(PPy)
coating.
enables
continuous
dielectric
properties
specific
maximize
EMW
absorption.
Remarkably,
optimized
composite
demonstrates
an
ultrathin
2.3
mm,
wide
band
spanning
5.89
GHz,
strong
intensity
-71.65
dB
at
minimal
loading
only
10
wt.%.
proposed
mild
controllable
preparation
not
provides
insights
further
tailoring
optimal
structures
enhance
capacity,
but
also
enriches
exploration
mechanisms
from
perspective
regulation.
