posted on 2024-01-09, 15:06authored byYujie Xu, Minghuan Hou, Jian Wang
Simultaneously realizing high electromagnetic
interference (EMI)
shielding and superhydrophobic properties of materials to ensure long-term
stability in harsh environments is a very challenging task. In this
work, an efficient superhydrophobic EMI shielding composite with a
gradient conductivity and porous structure was prepared by chemical
plating, in situ polymerization, and spraying processes. Benefiting
from the structural characteristics of porous multilayers and the
rational distribution of electromagnetic two-component fillers in
the composite, as well as the synergistic effect of various electromagnetic
loss mechanisms, a perfect unification of high EMI shielding effectiveness
of 62 dB and high absorption coefficient (A) of 0.77
was achieved. Meanwhile, a thin layer with further enhanced impedance
matching was constructed on the surface of the composite using double-sized
mixed particles of Fe3O4 and graphite particles
(GP) in conjunction with the spraying process. The rough surface microstructure
of the thin layer bestows the composite superhydrophobicity, and even
after long-term immersion in acidic and alkali solutions or repetitive
bending, the water contact angle still remains at a high level. Additionally,
the sprayed materials also endow the composite with outstanding photothermal
conversion properties that enhance the ability to adapt to environmental
changes, significantly raising the practical application value.