Abstract
Uniform core-shell SiO2@Fe3O4@C microspheres were prepared by a one-step hydrothermal method with SiO2 microspheres as the template, and the hollow Fe3O4@C (HFC) microspheres were achieved via etching SiO2 template. By changing the sizes of SiO2 microspheres, a series of HFC microspheres with variable cavity sizes were obtained to study the relationship between cavity size and microwave absorbing (MA) performance for the first time. The morphology and structure of samples were characterized in detail. The results showed that the MA performance of HFC sample depended on its cavity size. In particular, the hollow structure was good for improving MA performance and could make MA move to the high-frequency region. More importantly, as the cavity size increases, the resonance frequency of HFC-i (i=1, 2, 3, 4) samples moved to a low frequency, and the optimal matching thickness of HFC-i samples was increasing. Among all HFC-i samples, HFC-3 showed the most excellent MA performance, which could be mainly explained by the quarter-wavelength matching model, intrinsical magnetic and dielectric loss. Furthermore, the MA performance of HFC mixture blended by the equal mass fraction of HFC-2, HFC-3 and HFC-4 was the comprehensive results of three HFC-i samples. All the above suggested that the cavity size in HFC sample had a great influence on the MA performance.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (20104017), and the College Students’ Science and Technology Innovation Activities Plan of Zhejiang (2014R404056).
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Hou, Y., Yuan, H., Chen, H. et al. Controlled fabrication and microwave absorbing mechanism of hollow Fe3O4@C microspheres. Sci. China Chem. 60, 740–747 (2017). https://doi.org/10.1007/s11426-016-9001-5
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DOI: https://doi.org/10.1007/s11426-016-9001-5