Preparation and Microwave Absorbing Property of NiFe2O4/C Composites with Hollow Multishelled Structure

doi:10.7503/cjcu20220276

Abstract

Abstract:

Hollow nickel ferrite（NiFe₂O₄） materials with single-shelled and double-shelled structures were synthesized by a facile sequential templating approach（STA） to obtain the lightweight and high-performance electromagne-tic wave absorbent. The morphology of NiFe₂O₄ was controlled by changing the slurry constituents and process parameters. Polydopamine（PDA） and carbon were designed and coated on the surface of NiFe₂O₄through a simple in⁃situ polymerization and carbonization treatment， forming the composites with hollow multishelled structure（HoMS）. The electromagnetic parameters of NiFe₂O₄/C composites with different morphologies were measured by a network analyzer， and their reflection loss values were calculated by transmission line theory. And the effect of composites’ structures on the performance of electromagnetic absorbing were discussed in detail. The results show that the thin carbon coating significantly improves not only the electromagnetic properties but also the impedance matching， and thus the highly effective reflection loss. The double-shelled NiFe₂O₄/C HoMS composites displayed an excellent microwave absorbing performance. A minimum reflection loss（RL_min） of ‒32.35 dB was obtained at 8.44 GHz with absorber thickness of 3.5 mm， along with an effective absorption bandwidth of 3.68 GHz at a 2.0 mm thickness. These results can be attributed to the designable HoMS， which increases the probability of the multiple reflections/scattering and realizes more absorption of microwave besides the interfacial polarization between nanoparticles on the shells.

Key words: Nickel ferrite, Hollow multishelled structure（HoMS）, Sequential templating approach（STA）, Electromagnetic wave absorbing, Impedance matching

CLC Number:

O614

TrendMD:

HUANG Tianye, YANG Mei, WANG Jiangyan, ZHANG Shaojun, DU Jiang, WANG Dan. Preparation and Microwave Absorbing Property of NiFe₂O₄/C Composites with Hollow Multishelled Structure[J]. Chem. J. Chinese Universities, 2023, 44(1): 20220276.

Figures/Tables 8

References 22

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Preparation and Microwave Absorbing Property of NiFe₂O₄/C Composites with Hollow Multishelled Structure

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