Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 712, Issue -, Pages 59-68Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.04.070
Keywords
Expanded graphite; BaFe12O19; Carbon nanotube; Sol-gel auto-combustion; Sandwich microstructure; Electromagnetic wave absorbing property
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Funding
- Natural Science Foundation of China [51572221, 51672221]
- China Aeronautical Science Fund [2014ZF53074]
- Natural Science Foundation of Shaanxi Province [2016JQ5108]
- Northwestern Polytechnical University [Z20160011]
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The pursuing aim of high reflection loss and broad frequency bandwidth for electromagnetic wave (EMW) absorbing materials is a long-term task and under a close scrutiny. To construct rational microstructures for the absorber have significant impacts on increasing reflection loss and broadening frequency bandwidth. Herein, we presented a sandwich microstructured expand graphite (EG)/BaFe12O19 (BF) nanocomposite successfully prepared by in-situ sol-gel auto-combustion method. The experimental results showed that EG/BF nanocomposite has better EMW absorbing performance than pure EG and BF, the sandwich microstructured EG/BF connected with carbon nanotubes (CNTs) could further improve the electromagnetic performance effectively. The obtained CNT/EG/BF nanocomposite exhibited a saturation magnetization of 26.5 emu g(-1), at room temperature and an excellent EMW absorbing performance. The maximum reflection loss of the sandwich microstructured CNT/EG/BF composites with a thickness of 1 mm was up to -45.8 dB and the frequency bandwidth below -10 dB could reach to 4.2 GHz within the frequency range of 2-18 GHz. The research results indicated that the prepared nanocomposite showed great potential as a new type of microwave absorbing material. (C) 2017 Elsevier B.V. All rights reserved.
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