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Microwave electromagnetic and absorption properties of SiO2/C core/shell composites plated with metal cobalt

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Abstract

A facile method has been developed to fabricate magnetic core/shell SiO2/C/Co sub-microspheres via the pyrolysis of SiO2/PANI (polyaniline) and electroless plating method. The electromagnetic parameters of these SiO2/C and SiO2/C/Co composites were measured and the microwave reflection loss properties were evaluated in the frequency range of 2–18 GHz. The results show that the dielectric loss of SiO2/C composite increases with the increase of carbonization temperature and the magnetic loss enhances due to the deposition of cobalt on the SiO2/C sub-microspheres. The reflection loss results exhibit that the microwave absorption properties of the SiO2/C/Co composites are more excellent than those of SiO2/C composites for each thickness. The maximum effective absorption bandwidth (reflection loss ≤ −10 dB) arrives at 5.0 GHz (13.0–18 GHz) for SiO2/C/Co composite with 1.5 mm of thickness and the minimum reflection loss value is −24.0 dB at 5.0 GHz with 4.0 mm of thickness. The microwave loss mechanism of the SiO2/C/Co composites was also discussed in this paper.

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Acknowledgements

This work has been supported by Science and Technology on Near-Surface Detection Laboratory, the Natural Science Foundation of Jiangsu Province (Grant No. 20160941), the Natural Science Foundation-Outstanding Youth Foundation of Jiangsu Province of China (Grant No. BK20160091) and the National Natural Science Foundation of China (Grant Nos. 21601089 and 51405242).

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Authors and Affiliations

  1. Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing, 210044, China

    Guozhu Shen, Hongyan Wu, Jingfa Li & Buqing Mei

  2. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China

    Guozhu Shen, Hongyan Wu, Jingfa Li, Kaipeng Li & Buqing Mei

  3. Science and Technology on Near-Surface Detection Laboratory, Wuxi, 214035, China

    Xumin Fang & Yewen Xu

  4. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Hongyu Wei

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  1. Guozhu Shen
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  2. Xumin Fang
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  3. Hongyan Wu
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  8. Yewen Xu
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Correspondence to Yewen Xu.

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Shen, G., Fang, X., Wu, H. et al. Microwave electromagnetic and absorption properties of SiO2/C core/shell composites plated with metal cobalt. Appl. Phys. A 123, 291 (2017). https://doi.org/10.1007/s00339-017-0916-3

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  • DOI: https://doi.org/10.1007/s00339-017-0916-3

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