Journal of the American Ceramic Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 27, 2025
Abstract
Polymer‐derived
ceramics
(PDCs)
are
typically
prepared
as
ceramic‐based
microwave
absorption
materials
by
doping
with
high‐dielectric
or
transition
metals,
which
may
lead
to
the
issue
of
uneven
mixing.
This
study
achieves
uniform
blending
at
molecular
level
using
poly(dimethylsilylene)diacetylenes
(PDSDA)
modify
hyperbranched
polyborosilazane
(PBSZ).
The
alkynyl
group
and
Si−H
bonds
crosslink
form
a
ceramic
precursor,
is
then
pyrolyzed
prepare
SiBCN
excellent
performance
high
temperature
stability.
introduction
PDSDA
significantly
improved
yield,
resulting
in
situ
formation
more
ordered
carbon,
SiC
nanocrystals,
nanowires
within
ceramics.
These
nanophases
uniformly
dispersed
throughout
matrix,
enhancing
ceramic's
dielectric
loss
properties.
After
1400°C,
derived
from
precursor
PBSZ:PDSDA
mass
ratio
10:1
exhibits
electromagnetic
wave
properties,
minimum
reflection
−50.11
dB
maximum
effective
bandwidth
3.11
GHz.
Moreover,
maintain
stability
1500°C
both
argon
air
environments.
fully
exploits
designability
molecules,
providing
new
approach
for
preparation
PDCs
route.
Nano-Micro Letters,
Journal Year:
2024,
Volume and Issue:
17(1)
Published: Sept. 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.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 27, 2024
Abstract
By
manipulating
their
asymmetric
electronic
spin
states,
the
unique
structures
and
unsaturated
coordination
environments
of
single
atoms
can
be
effectively
harnessed
to
control
magnetic
properties.
In
this
research,
first
investigation
is
presented
into
regulation
properties
through
states
atoms.
Magnetic
single‐atom
one‐dimensional
materials,
M‐N‐C/ZrO
2
(M
=
Fe,
Co,
Ni),
with
varying
are
design
synthesize
based
on
orbital
structure
model.
The
SAs
3
d
electron
composite
M‐N‐C
modulates
magneto
physical
triggers
a
natural
resonance
loss,
which
achieves
controllable
tuning
effective
absorption
band
under
low‐frequency
conditions.
minimum
reflection
loss
(
RL
min
)
reach
‐69.71
dB,
bandwidth
EAB
ratio
as
high
91%
(2–18
GHz).
current
work
provides
path
toward
achieving
modulation
electromagnetic
wave
bands
by
exploring
mechanism
atomic
even
level
interactions
influence
modulation.
Carbon,
Journal Year:
2024,
Volume and Issue:
229, P. 119513 - 119513
Published: Aug. 8, 2024
With
rapid
technological
advancements,
electromagnetic
radiation
is
becoming
one
of
new
forms
pollution,
which
not
only
affects
the
use
precision
instruments,
but
also
threatens
safety
human
life.
Electromagnetic
wave
(EMW)
absorbing
material
can
effectively
attenuate
EMW,
among
carbon
fiber
doped
magnetic
particles
possess
low
density,
multiple
attenuation,
and
magnetic-dielectric
synergy,
attracting
more
attention.
Carbon-based
fibers
achieve
combination
loss
dielectric
loss,
improve
impedance
match,
resulting
in
excellent
reflection
(RL)
effective
absorption
bandwidth
(EAB).
Herein,
recent
researches
on
carbon-based
are
reviewed,
focusing
preparation
methods
structural
difference.
It
specifically
introduces
their
performance
advantages,
providing
a
brief
analysis
structure-property
relationship.
Finally,
extensive
application
potential
emphasize,
highlighting
challenges
opportunities
field
EMW
absorption.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 7, 2024
Abstract
Construction
of
built‐in
electric
field
(BIEF)
in
nanohybrids
has
been
demonstrated
as
an
efficacious
strategy
to
boost
the
dielectric
loss
by
facilitating
oriented
transfer
and
transition
charges,
thus
optimizing
electromagnetic
wave
absorption
property.
However,
specific
influence
BIEF
on
interface
polarization
needs
explore
thoroughly
strength
should
be
further
augmented.
Herein,
several
systems
incorporated
Mott–Schottky
heterojunctions
hollow
structures
are
designed
constructed,
where
bimetallic
zeolitic
imidazolate
framework
employed
derive
Cu‐ZnO
heterojunctions,
hierarchical
enriched
introducing
structure
reduced
graphene
oxide.
The
well‐established
“double”
verified
theoretical
calculation
engineering
can
regulate
conductivity,
enhance
relaxation
effectively.
Especially,
there
always
coexisted
both
enhanced
charge
separation
reversed
distribution
this
BIEF,
boosting
polarization.
Attributing
synergy
well‐matched
impedance
amplified
loss,
obtained
hybrids
exhibited
superior
(reflection
−46.29
dB
ultra‐wide
effective
bandwidth
7.6
GHz
at
only
1.6
mm).
This
work
proves
innovative
model
for
dissecting
mechanisms
pioneers
a
novel
advanced
absorbers
through
enhancing
BIEF.
Materials Chemistry Frontiers,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Electromagnetic
wave
absorbing
material
(EMWAM)
based
on
metal-organic
framework
(MOF)
has
high
loss
capacity
and
wide
absorption
bandwidth.
This
paper
reviews
recent
research
MOF-based
EMWAM
outlines
current
challenges
future
directions.
Soft Science,
Journal Year:
2024,
Volume and Issue:
4(4)
Published: Dec. 24, 2024
Microwaves
are
currently
used
in
many
fields,
including
the
military,
medical,
and
communication.
However,
ensuing
electromagnetic
radiation
has
seriously
threatened
human
life.
Therefore,
design
of
high-performance
microwave
absorbing
materials
(MAMs)
become
an
important
development
direction.
Metal-organic
frameworks
(MOFs)
regarded
as
a
bright
new
star
among
MAMs
with
broad
application
prospects
due
to
their
advantages
tunable
structure,
large
specific
surface
area,
high
porosity,
etc
.
This
paper
reviews
research
progress
derived
from
MOFs
recent
years,
preparation
methods,
properties
absorption
mechanisms.
Finally,
problems
MOF-derived
discussed.
