Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 897, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163227
Keywords
Core-shell structure; Porous structure; Electromagnetic wave absorption; Assembled structure; Multiple absorption channels
Categories
Funding
- National Natural Science Foundation of China [51672221, 51872231]
- Key Industrial Chain Project of Shaanxi Province, China [2018ZDCXL-GY-08-07]
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The morphology, composition, and loading of Ni/NiO microspheres greatly affect the electromagnetic parameters and electromagnetic wave absorption performance. Ni/NiO550 exhibits a unique porous-microsphere structure which is conducive to diverse loss mechanisms.
The research and development of electromagnetic wave absorbing materials with light weight, thin thickness, powerful absorption, and wide frequency bandwidth is a long-term pursuing. Here, Ni/NiO microspheres were synthesized through hydrothermal reaction followed by thermal reduction process. The experimental results indicated that the electromagnetic parameters and electromagnetic wave absorption performance were seriously affected by the morphology, composition and loading of Ni/NiO microspheres. When the reduction temperature rose to 550 degrees C, Ni/NiO550 showed a special porous-microsphere structure which assembled by irregular Ni/NiO core-shell nanorods. The micro-size combination of porous and core shell structures, the affluent surface area, sufficient NiO-Ni interface, high-concentration active sites were conducive to the impedance matching and diverse loss mechanism including conductive loss, interfacial polarization, dipole polarization, natural/exchange resonance and multiple scattering. Finally, 45 wt% porous Ni/NiO/paraffin composite exhibited high reflection loss (- 52.15 dB) and broad effective frequency bandwidth (3.22 GHz) at a thickness of 2.17 mm. (c) 2021 Elsevier B.V. All rights reserved.
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