A carbon-fabric/graphene/poly(vinylidene fluoride) film that is light weight, highly flexible, and mechanically robust with outstanding electromagnetic shielding properties and thermal conductivity.
In
the 5G era, for portable electronics to operate at high performance
and low power levels, the incorporation of superior electromagnetic
interference (EMI) shielding materials within the packages is of critical
importance. A desirable wearable EMI shielding material is one that
is lightweight, structurally flexible, air-permeable, and able to
self-clean. To this end, a bioinspired electroless silver plating
strategy and a one-step electrodeposition method are utilized to prepare
an EMI shielding fabric (CEF-NF/PDA/Ag/50-30) that possesses these
desirable properties. Porous CEF-NF mats with a spatially distributed
silver coating create efficient pathways for electron movement and
enable a remarkable conductivity of 370 S mm–1.
When tested within a frequency range of 8.2–12.4 GHz, this
highly conductive fabric not only achieves an EMI shielding effectiveness
(EMI SE of 101.27 dB at 5028 dB cm2 g–1) comparable to a very thin and light metal but also retains the
unique properties of fabricsbeing light, structurally flexible,
and breathable. In addition, it exhibits a high contact angle (CA)
of 156.4° with reversible surface wettability. After having been
subjected to 1000 cycles of bending, the performance of the fabric
only decreases minimally. This strategy potentially provides a novel
way to design and manufacture an easily integrated EMI shielding fabric
for flexible wearable devices.
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