Abstract
Core-shell structural design is an attractive strategy to achieve high-performance microwave absorbers. Nevertheless, it still remains a problem to simultaneously obtain superior microwave dissipation and impedance matching for microwave absorption (MA) materials. In this work, ZnO-NiCo2O4-NiCo2O4 (ZNN) core–shell microstructure is designed and fabricated by covering NiCo2O4 nanosheets on the surface of ZnO nanorod and next growth of NiCo2O4 nanoparticles. With the synergies from the NiCo2O4 nanosheets improving the microwave attenuation capability and the NiCo2O4 nanoparticles increasing the impedance matching, ZNN possesses efficient MA performance: the strongest reflection loss is −59.93 dB at the corresponding thickness of 2.6 mm, and the maximum absorption bandwidth is 7.04 GHz at 2.4 mm, which covers the entire Ku-band. RCS simulation also indicates that ZNN has outstanding MA performance. Moreover, this study proposes a point for the utilization of nickel–cobalt oxides in MA materials, and offers a reference for the design of core–shell structural absorbers.
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