A novel magnetic
nanocomposite of Ni
x
Mn
1–
x
Fe
2
O
4
/carbonized chaff (
x
= 0.3, 0.5, and 0.7) has been
synthesized successfully via the co-carbonization and hydrothermal
method. The microstructure, morphology, complex permittivity and permeability,
and microwave absorbing properties were systematically studied by
X-ray diffraction, scanning electron microscopy, and a vector network
analyzer. Compared to the pure Ni
0.5
Mn
0.5
Fe
2
O
4
NPs, the Ni
0.3
Mn
0.7
Fe
2
O
4
/carbonized chaff-N
2
composite exhibits
an optimal microwave absorption property at 4 mm as the mass percent
of carbonized chaff is 10 wt %, the maximum reflection loss of which
can reach −14.58 dB at 1.91 GHz with the −10 dB frequency
bandwidth in the range of 1.46–2.41 GHz (0.95 GHz). The enhanced
electromagnetic wave absorbing performance is ascribed to the good
synergistic effect among laminated structures, better impedance matching
condition, strong natural resonance loss, Debye dipolar relaxation
to some extent, and so forth. Most importantly, this study provides
a novel way to prepare easily degradable, environment-friendly, and
high-efficiency electromagnetic wave absorbers by utilizing the structural
property of renewable biomaterials.
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