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Synthesis and microwave-absorbing properties of Co3Fe7@C core–shell nanostructure

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Abstract

Co3Fe7@C core–shell nanoparticles with high performance of microwave-absorbing properties were prepared by hydrothermal method and heat treatment. The transformation of structural, morphological and magnetic properties among the carbon-encapsulated composites, which were annealed at three different temperatures, were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). XRD analysis indicated the phase composition of Co3Fe7/CoFe2O4, Fe3C/Co3Fe7 and pure Co3Fe7 at different annealing temperatures. TEM confirmed the Co3Fe7@graphite core–shell nanostructure with an average particle size of 180 nm. The saturation magnetization (M s) increased monotonically with the increase in temperature, which was attributed to the crystal growth and purity of metallic core. Co3Fe7@graphite nanoparticles exhibited the hysteretic loops of soft ferromagnetic behavior with high M s of 222.85 emu g−1, weak remanent magnetization (M r) and coercivity (H c). For Co3Fe7@graphite nanomaterial, a reflection loss exceeding −20 dB was obtained between 2.8 and 10.2 GHz, which almost covering from S-band to X-band. The maximum reflection loss is −26.8 dB at 9 GHz with 1.8 mm thickness. The excellent microwave absorption properties result from the proper electromagnetic match in core–shell nanostructure and the strong natural ferromagnetic resonance.

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Acknowledgments

The work is supported by the State Key Laboratory of Explosion Science and Technology, BIT, PR China.

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Authors and Affiliations

  1. School of Mechatronic Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Xiao Dang Guo, Xiao Jing Qiao, Qing Guo Ren, Xiang Wan & Zhi Gang Sun

  2. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310000, China

    Wang Chang Li

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  1. Xiao Dang Guo
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  2. Xiao Jing Qiao
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  3. Qing Guo Ren
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  4. Xiang Wan
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  5. Wang Chang Li
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Correspondence to Xiao Jing Qiao.

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Guo, X.D., Qiao, X.J., Ren, Q.G. et al. Synthesis and microwave-absorbing properties of Co3Fe7@C core–shell nanostructure. Appl. Phys. A 120, 43–52 (2015). https://doi.org/10.1007/s00339-015-9164-6

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  • DOI: https://doi.org/10.1007/s00339-015-9164-6

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