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Hollow hydrangea-like nitrogen-doped nio/ni/carbon composites as lightweight and highly efficient electromagnetic wave absorbers

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Nano Research 2022年第8期15卷 6831-6840页

作者： Jin Liang chunwei Li Xin cao Yuxiang Wang Zongcheng Li Benzheng Gao Zeyou Tong Bin Wang Shuchen Wan Jie Kong MOE Key Laboratory of Materials Physics and chemistry in Extraordinary conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China china Academy of Launch Vehicle Technology Beijing 100076China Minmetals exploration&development cO.LTD Beijing 100010China

Hierarchical hollow-structured magnetic–dielectric materials are considered to be promising and competitive functional absorbers for microwave absorption(MA).Herein,a hierarchical hollow hydrangea multicomponent metal oxides/metal-carbon was designed and successfully produced via a facile self-assembly method and calcination *** magnetic nio and ni nanoparticles were suspended within the hollow hydrangea-like nitrogen-doped carbon matrix(HH N-nio/ni/c),constructing a unique hierarchical hollow structured multicomponent magnetic–dielectric MA *** annealing temperature and oxidation time were carefully regulated to investigate the complex permittivity and *** N-nio/ni/c delivers exceptional MA properties with maximum reflection loss of–45.8 dB at 1.7 mm thickness and displays a wide effective absorption frequency range of 5.6 *** superior MA performance can be attributed to the following aspects:(1)The hierarchical hollow multicomponent structure offers plentiful of heterojunction interfaces triggering interfacial polarization;(2)nitrogen doped-carbon(N-c)facilitates the conductive loss by the unique electron migration path in the graphitized c and nio/ni;(3)magnetic nio/ni nanoparticles homogeneously dispersed within N-c form extensive c skeleton and strengthen the magnetic response ability;(4)hierarchical hollow wrinkled structures possess a large interspace and heterogeneous interface improving polarization loss and enhancing multireflection process and the unique structure satisfies magnetic and dielectric loss simultaneously resulting from synergistic effects of different components within the composites.

关键词： hierarchical magnetic-dielectric composites hollow hydrangea-like structure impedance matching nitrogen doped nio/ni/c microwave absorption

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