Multiple Interfaces Structure Derived from Metal–Organic Frameworks for Excellent Electromagnetic Wave Absorption |
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| Authors: | Xiaohui Liang Bin Quan Yansheng Sun Guangbin Ji Yanan Zhang Jianna Ma Daoran Li Baoshan Zhang Youwei Du |
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| Affiliation: | 1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, P. R. China;2. School of Electronic Science and Engineering, Nanjing University, Nanjing, P. R. China;3. Laboratory of Solid State Microstructures, Nanjing University, Nanjing, P. R. China |
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| Abstract: | Hierarchical yolk–shell nanostructure (NiO/Ni/GN@Air@NiO/Ni/GN) derived from Ni‐based metal–organic frameworks (Ni‐MOFs) is synthesized by solvothermal reactions. After successive carbonization and oxidation treatments, hierarchical NiO/Ni nanocrystals covered with a graphene shell are obtained with the yolk–shell nanostructure intact. The NiO/Ni/GN@Air@NiO/Ni/GN composites are characterized by X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that the NiO/Ni/GN@Air@NiO/Ni/GN composites exhibit superior electromagnetic wave absorption properties. A minimum reflection loss (RLmin) of ?34.5 dB is obtained at 17.2 GHz with the thin thickness of 1.7 mm. In addition, the best microwave absorption properties are achieved with a 2.0 mm absorber layer (RLmin = ?22.5 dB, bandwidth of 6.0 GHz). The outstanding absorption ability may arise from the unique yolk–shell structure and nanoporous carbon, which can tune the dielectric of the NiO/Ni/GN@Air@NiO/Ni/GN composites to acquire good impedance matching. Moreover, the interspaces can induce interfacial polarization and multiple reflections. |
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| Keywords: | electromagnetic wave absorption interfacial polarization nanoporous carbon NiO/Ni/graphene yolk– shell structures |
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