ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
17(1), P. 2304 - 2316
Published: Dec. 26, 2024
Achieving
high
shielding
effectiveness
in
electromagnetic
materials
relies
heavily
on
conductivity,
yet
simultaneously
enhancing
the
absorption
loss
remains
a
persistent
challenge.
Consequently,
study
successfully
creates
efficient
composite
films
with
unique
grape-like
bunch
structure
of
hollow
nanosilver
(HCAF)
through
layer-by-layer
assembly.
The
utilization
poly(dopamine)
(PDA)
to
anchor
granules
(AgNPs)
onto
cellulose
nanofibers
(CNF)
results
formation
CNF@PDA@AgNPs.
Subsequently,
surface
protection
etching
method
is
employed
etch
AgNPs,
resulting
(H-AgNPs)
and
generation
CNF@PDA@H-AgNPs.
A
film
featuring
grape
fabricated
by
interweaving
aspect
ratio
CNF
substantial
quantity
H-AgNPs
an
abundant
interface,
while
establishes
conductive
network.
That
enables
exhibit
excellent
impedance
matching,
conductivity
loss,
polarization
multiple
reflection
loss.
Therefore,
thickness
148.8
μm
reaches
212660
S/m,
SET,
SEA,
SER
89.56,
79.03,
10.53
dB
X
band,
significantly
better
than
76.9,
55.55,
21.41
solid
AgNPs
film.
also
exhibits
remarkable
thermal
(The
coefficients
in-plane
out-plane
are
4.61
0.17
W/(m·K),
respectively),
mechanical
properties,
strain
sensing
capabilities,
making
it
significant
potential
for
applications
flexible
electronics
other
related
fields.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 15, 2025
Abstract
It
is
crucial
to
develop
electromagnetic
interference
(EMI)
shielding
materials
with
high
efficiency
(SE)
and
reduced
reflection
mitigate
the
secondary
pollution
caused
by
waves
(EMWs).
Herein,
a
novel
multilayer
assembly
strategy
inspired
structure
of
“Turkish
dessert—Baklava”
proposed
introduce
magnetic
hollow
Fe
3
O
4
nanospheres
(HFO)
conductive
MXene
nanosheets
into
bacterial
cellulose
(BC)
network.
Through
layer‐by‐layer
vacuum
filtration
approach,
composite
BC/MXene/HFO
film
controllable
electric‐magnetic
dual‐gradient
achieved.
The
construction
dual
gradients
alleviates
impedance
mismatch
at
air‐film
interface,
resulting
in
reflectivity
toward
EMWs,
while
unique
HFO
facilitates
“absorption–reflection–reabsorption”
process
EMWs.
Consequently,
as‐prepared
(0.35
mm
thickness)
exhibits
an
extraordinary
EMI
SE
67.6
dB
as
low
5.1
dB.
Furthermore,
it
also
demonstrates
exceptional
mechanical
properties,
efficient
thermal
management,
Joule
heating
capabilities,
well
remarkable
passive
active
infrared
camouflage
performances.
This
study
offers
innovative
approach
achieve
less
more
absorption
expands
application
scope
precision
electronics,
aerospace,
military
equipment
fields.
ACS Applied Nano Materials,
Journal Year:
2025,
Volume and Issue:
8(4), P. 1912 - 1924
Published: Jan. 21, 2025
Modern
intelligent
electronic
devices
require
electromagnetic
interference
(EMI)
shielding
composite
films
with
outstanding
effectiveness
and
multifunctionality
to
adapt
increasingly
complex
application
environments.
In
this
work,
inspired
by
the
morphology
of
cocoa
trees,
SiO2
is
conceived
as
fruit
one-dimensional
nanomaterial
silver
nanowires
(AgNWs)
branches.
Utilizing
metal
chelating
properties
polydopamine
(PDA),
SiO2@PDA@AgNWs
were
formed
subsequently
interwoven
cellulose
nanofibers
(CNFs)
create
a
nanocomposite
film
cocoa-tree-like
structure,
denoted
CNFs-AgNWs-SiO2@PDA
(C-A-SP).
Conductive
AgNWs
induce
conductivity
losses,
while
contribute
multiple
scattering
interfacial
polarization
losses.
Therefore,
C-A-SP
thickness
59
μm
demonstrates
an
impressive
EMI
(EMI
SE)
76.91
dB
exhibits
specific
SE
(SSE/t)
15304.88
dB·cm2·g–1.
Meanwhile,
thermal
conductivities
in-plane
out-plane
reached
4.15
0.15
W/(m·K),
respectively.
Additionally,
also
excellent
strain-sensing
capability.
This
study
provides
valuable
insights
for
designing
fabricating
lightweight,
flexible,
multifunctional
efficient
composites.
