期刊
CERAMICS INTERNATIONAL
卷 46, 期 2, 页码 1560-1568出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.09.124
关键词
Mn3O4; EM absorption; MWCNTs; Hollow structure; Interfacial polarization
资金
- National Natural Science Foundation of China [61701386]
- Young Star Project of Science and Technology of Shaanxi Province [2019KJXX-033]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ5060]
- Scientific Research Program - Shaanxi Provincial Education Department [18JK0390]
Investigating lightweight and high-efficiency electromagnetic wave (EM) absorbers is evolving as a desirable approach to solve the electromagnetic pollution. In this study, Mn3O4 hollow polyhedron wrapped by multiwalled carbon nanotubes (Mn3O4/MWCNTs) was successfully prepared by one-step hydrothermal treatment. Interestingly, the Mn3O4 polyhedron as a unique hollow structure can serve as a microwave receiver and the incident EM waves hardly escape in the intricate networks, which could be repetitiously attenuated and consumed. The Mn3O4/MWCNTs composite with a filler loading of 20 wt% exhibits most outstanding EM absorption performance over the whole frequency of 2-18 GHz. The optimal reflection loss (R (L)) achieves - 53.8 dB at 11 GHz, and the effective absorption bandwidth (R-L exceeding -10 dB) reaches 4.1 GHz (9.1-13.2 GHz) with a thickness of 2.5 mm. The effective absorption bandwidth (R-L < -10 dB) up to 13.7 GHz (85% absorption over 2-18 GHz) was achieved by adjusting the thickness from 1.5 to 4 mm. The remarkable EM absorption performances benefit from the synergistic effects of suitable impedance matching, dielectric loss, interfacial polarizations and relaxation polarizations. These results indicate that Mn3O4/MWCNTs composite with lightweight and high-efficiency microwave absorption properties could serve as a prospective microwave absorber in practical applications.
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