Carbon
nanoparticles
(CNPs)
derived
from
metal-organic
frameworks
(ZIF-8)
are
synthesized,
which
further
self-assembled
into
mono-
or
bilayer
superstructures
for
electromagnetic
(EM)
wave
absorption.
Furthermore,
the
effect
of
ZIF-8
morphology
(cubic
rhombic
dodecahedral)
on
superstructure
and
EM
absorption
performance
CNPs
is
investigated.
The
as-prepared
cubic
exhibits
a
higher
BET
surface
area
526.1
m
Polymer-based
one-
and
two-dimensional
(1D-2D)
carbon
nanomaterials
are
considered
promising
microwave-absorbing
materials
(MAMs)
due
to
their
high
atomic
utilization
efficiency
tunable
microscopic/macroscopic
morphology.
The
design
of
1D-2D
through
a
facile
method
meet
the
requirements
advanced
MAMs
remains
challenge.
In
this
work,
environmentally
friendly
processing
ultrasonic
spray
ice
template
(USIT)
is
employed
fabricate
porous
based
on
Kapton-type
polyimide,
which
exhibit
intriguing
morphology
both
1D
nanowires
2D
nanosheets.
Under
subsequent
carbonization
at
700
800
°C,
obtained
inherit
original
Furthermore,
or
nanomorphology
can
be
readily
controlled
by
adjusting
concentration
precursor
solution.
For
samples
fabricated
with
lower
concentrations
(0.1%),
nanowire
structures
predominant.
Interconnected
conductive
networks
heterogeneous
interfaces
formed
intertwining
stacking
nanowires,
thereby
enhancing
conductivity
loss.
Additionally,
abundant
structure
provides
an
effective
channel
for
electromagnetic
wave
entrance,
significantly
improving
impedance
matching
ability.
results
show
that
nanowire-dominated
(700
°C
carbonization)
excellent
microwave
absorption
performance.
reflection
loss
minimum
(RLmin)
-67.2
dB
8.1
GHz
4.65
mm,
maximum
bandwidth
(<-10
dB)
7.7
3.03
mm.
Exemplified
MAMs,
USIT
strategy
has
broad
prospects,
providing
enormous
potential
various
practical
applications
bridging
gap
between
polymer
precursors
1D/2D
nanomaterials.
