A type of hollow core–shell ZnO/Fe3O4@C fibers were fabricated by a facile combination of
electrospinning,
calcination, and pyrolytic pyrrole-derived carbon coating. The combination
of ZnO/Fe3O4 fibers and carbon nanolayer improved
the dielectric loss capability of the nanocomposites and obtained
good impedance matching, leading to excellent electromagnetic wave
(EMW) absorption performance. The minimum reflection loss of the ZnO/Fe3O4@C nanocomposites reached −74.2 dB at
a thickness of merely 2.2 mm, and the effective absorption bandwidth
reached 5.5 GHz at a matching thickness of 2.1 mm. Compared with the
ZnO- or Fe3O4-based composites ever reported,
our ZnO/Fe3O4@C nanocomposites exhibited superior
EMW absorption characteristics due to the efficient design of multiple
synergistical components and hollow fibrous structures. Combined with
the facile, scalable preparation approach, the hollow core–shell
ZnO/Fe3O4@C nanocomposite fibers with high EMW
absorption performance show great potential for EMW absorption applications.
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