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Published on: March 8, 2020
Hierarchical FBN@Co/CoO heterointerfaces for synergistically tailored microwave attenuation and efficient thermal
Jialin Zang1,2, Zhen Lv1,3, Chunpeng Yang1,2
1Qiqihar Medical University, Qiqihar, Heilongjiang Province 161006, P.R. China.
Abstract:
Multifunctional materials integrating electromagnetic wave attenuation and thermal management are crucial for advanced stealth and protection technologies. Herein, rod-like FBN@Co/CoO composites are fabricated via in situ growth of uniformly distributed Co/CoO heterointerfaces on fluorinated boron nitride (FBN) surfaces. The optimized FBN@Co/CoO-700 exhibits a minimum reflection loss of -77.40 dB at 4.18 mm and an effective absorption bandwidth of 5.59 GHz, arising from synergistic conduction, polarization, and magnetic losses enabled by Co/CoO heterointerfaces and optimized impedance matching. When incorporated into a UV-curable resin, the composite achieves a thermal conductivity of 0.9964 W m-1 K-1 at 10 wt. % loading, nearly 4-fold higher than that of the pristine resin, owing to continuous heat-transfer pathways and reduced interfacial thermal resistance. Radar cross section (RCS) simulations further confirm its stealth capability, with RCS values below -10 dB m2 within -9°-9° and a minimum of -36.71 dB m2. These results highlight the effectiveness of heterointerface engineering for multifunctional electromagnetic-thermal materials.
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