Abstract
To obtain outstanding electromagnetic microwave absorption (EMWA) properties, the rambutan-like dielectric–magnetic C@NiCo2O4 material was successfully prepared by a simple hydrothermal method, followed by a carbonization process. Benefiting from the unique rambutan-like structure, the dielectric–magnetic C@NiCo2O4 composites showed excellent microwave attenuation ability: minimum reflection loss (RLmin) value of − 39.0 dB at 17.4 GHz and wide effective absorption bandwidth (EAB, reflection loss exceeding − 10 dB) of 4.16 GHz (> 13.84 GHz) with a matching thickness of only 1.5 mm, which were much better than those of pure C and NiCo2O4. The superior properties might be due to multiple synergistic effects: magnetic loss (NiCo2O4), dielectric loss (C, NiCo2O4), the multi-reflections, scattering and interface relaxation resulting from mesoporous rambutan-like structures, and the dipole polarization to get good electromagnetic matching and high attenuation efficiency.
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This project was supported by the National Natural Science Foundation of China (No. 41476059) and China Postdoctoral Science Foundation (No. 2016M600557).
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Li, C., Ge, Y., Jiang, X. et al. The rambutan-like C@NiCo2O4 composites for enhanced microwave absorption performance. J Mater Sci: Mater Electron 30, 3124–3136 (2019). https://doi.org/10.1007/s10854-018-00592-3
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DOI: https://doi.org/10.1007/s10854-018-00592-3