In this study, the
interfacial engineered Fe@FeSi/SiO2 nanocomposite has been
synthesized by a one-step route of dc arc-discharge plasma. Higher
energy states of Ar/Fe/Si ions in the plasma were also diagnosed by
means of online optical emission spectroscopy (OES), supplying energetic
information on the configuration of Fe@FeSi nanocapsules embedded
in SiO2 matrix. It is indicated that the determined electron
temperatures of Ar, Fe, and Si ions are 23 513 K (2.02 eV),
23 225 K (2.00 eV), and 23 063 K (1.99 eV), respectively.
Electromagnetic parameters display three prominent resonance peaks
at 9.7, 14.3, and 16.8 GHz; these are the result of the synergetic
effect of heterogeneous interfaces among the Fe@FeSi/SiO2 nanocomposite. The optimized reflection losses at these resonant
frequencies are −33, −20, and −38 dB in certain
thicknesses, respectively. The excellent microwave absorption of the
Fe@FeSi/SiO2 nanocomposite is readily tunable by consequence
of the multiresonance behavior and electromagnetic synergetic effect
in the interface-rich nanocomposite. The revealed multiresonance phenomena
are significant in the design and fabrication of electromagnetic materials
as well the correlative devices, with effective absorption losses
at distinctive frequencies.
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