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Multiple Interfaces Structure Derived from Metal–Organic Frameworks for Excellent Electromagnetic Wave Absorption
Author(s) -
Liang Xiaohui,
Quan Bin,
Sun Yansheng,
Ji Guangbin,
Zhang Yanan,
Ma Jianna,
Li Daoran,
Zhang Baoshan,
Du Youwei
Publication year - 2017
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201700006
Subject(s) - non blocking i/o , materials science , absorption (acoustics) , nanostructure , transmission electron microscopy , carbonization , scanning electron microscope , nanoporous , chemical engineering , reflection loss , methyl orange , dielectric , composite material , nanotechnology , optoelectronics , composite number , photocatalysis , chemistry , organic chemistry , engineering , catalysis
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 (RL min ) 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 (RL min = −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.