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- Title
Core/Shell Structured Ni/Fe<sub>3</sub>O<sub>4</sub> Composites with Enhanced Electromagnetic Absorption Performances.
- Authors
Zhu, Yanyan; Wang, Hongyan; Zhang, Keying; Chen, Chong; Cao, Hongxia
- Abstract
Core/shell structured Ni/Fe3O4 composites with grain sizes of 200–800 nm were synthesized by using a hydrothermal method. The phase structure, morphology, magnetic and electromagnetic absorption properties of the as-prepared samples were characterized by various analysis techniques. Experimental results revealed that spinel Fe3O4 was in situ deposition on the surface of Ni spheres through electrostatic interactions. Moreover, the Ni/Fe3O4 mass ratios had a significant influence on the electromagnetic absorption performances. When the mass ratio of Ni/Fe3O4 was 1:1, the composites reached an outstanding reflection loss (RL) of − 48.06 dB at 12.96 GHz with a thin thickness of 1.8 mm. Meanwhile, the effective absorption bandwidth was 5.36 GHz (10.72–16.08 GHz), covering the X and Ku bands. The enhanced electromagnetic absorption performance of core/shell structured Ni/Fe3O4 composites as compared to pure Ni, may be attributed to the multiple interfacial polarization, magnetic exchange coupling resonance and optimal impedance matching. Consequently, core/shell structured Ni/Fe3O4 composites would be promising candidates for a wider range of electromagnetic absorption applications. Core/shell structured Ni/Fe3O4 composites with grain sizes of 200–800 nm were synthesized by a hydrothermal method. The electromagnetic absorption performances of the composites could be optimized by changing Ni/Fe3O4 mass ratios. It exhibits an optimum reflection loss of –48.06 dB at 12.96 GHz with 1.8 mm. The effective absorption was over the frequency range of 10.72–16.08 GHz, covering X and Ku bands. Core/shell structured Ni/Fe3O4 composites would be promising candidates for high-efficiency absorbers in the electromagnetic absorption field.
- Subjects
COMPOSITE structures; ABSORPTION; IMPEDANCE matching; ELECTROSTATIC interaction; ELECTROMAGNETIC fields; ELECTROMAGNETIC spectrum
- Publication
NANO, 2021, Vol 16, Issue 2, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S179329202150020X