Journal of Materials Science

, Volume 53, Issue 13, pp 9635–9649 | Cite as

Microwave absorption by watermelon-like microspheres composed of γ-Fe2O3, microporous silica and polypyrrole

  • Cuiping Li
  • Shengning Ji
  • Xiaohui Jiang
  • Geoffrey I. N. Waterhouse
  • Zhiming Zhang
  • Liangmin Yu
Electronic materials


Uniform γ-Fe2O3/microporous SiO2/polypyrrole (Fe/m-SiO2/PPy) microspheres (MSs) with “watermelon-like” structures were successfully fabricated using cetyltrimethylammonium bromide (CTAB) as a pore-directing agent. In the “watermelon-like” microspheres, γ-Fe2O3 nanoparticles represented the seeds, m-SiO2 the pulp, and PPy the rind. Through synergistic harnessing of the magnetic loss properties of γ-Fe2O3 and the dielectric loss properties of the m-SiO2/PPy core/shell structure, the Fe/m-SiO2/PPy MSs displayed outstanding excellent electromagnetic wave absorption (EMWA) properties. The maximum reflection loss (RLmax) of Fe/m-SiO2/PPy was − 51.24 dB (7.44 GHz) with a thickness of 4.0 mm, with an effective absorption bandwidth (EAB) (RL < − 10 dB) of 4.16 GHz at a loading of 14.2 wt% in a paraffin wax matrix. These results conclusively demonstrate that Fe/m-SiO2/PPy MSs-containing composites are very efficient EMWA materials and that porous core/shell/shell structures offer a promising approach for the rational design of lightweight high-performance EMW absorbers.



This project was supported by the National Natural Science Foundation of China (No. 41476059) and China Postdoctoral Science Foundation (No. 2016M600557).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interests.

Supplementary material

10853_2018_2262_MOESM1_ESM.docx (46 kb)
Supplementary material 1 (DOCX 45 kb)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Cuiping Li
    • 1
    • 2
  • Shengning Ji
    • 1
    • 2
  • Xiaohui Jiang
    • 1
    • 2
  • Geoffrey I. N. Waterhouse
    • 3
  • Zhiming Zhang
    • 1
    • 2
  • Liangmin Yu
    • 1
    • 2
  1. 1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of EducationOcean University of ChinaQingdaoChina
  2. 2.Qingdao Collaborative Innovation Center of Marine Science and TechnologyQingdaoChina
  3. 3.School of Chemical SciencesThe University of AucklandAucklandNew Zealand

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