Synthesis of sandwich microstructured expanded graphite/barium ferrite connected with carbon nanotube composite and its electromagnetic wave absorbing properties

JOURNAL OF ALLOYS AND COMPOUNDS

卷:712

Article

Zhao, Tingkai¹  Jin, Wenbo¹  Ji, Xianglin¹  Yan, Huibo¹  Jiang, Yuting¹  Dong, Ying¹  Yang, Yali¹  Dang, Alei¹  Li, Hao¹  Li, Tiehu¹  Shang, Songmin²  Zhou, Zhongfu³ 

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Shaanxi Engn Lab Graphene New Carbon Mat & Applic, Sch Mat Sci & Engn, Xian 710072, Peoples R China

[2] Hong Kong Polytech Univ, Inst Text & Clothing, Kowloon, Hong Kong, Peoples R China

[3] Aberystwyth Univ, Dept Phys, Aberystwyth SY23 3FL, Dyfed, Wales

关键词: Expanded graphite;    BaFe12O19;    Carbon nanotube;    Sol-gel auto-combustion;    Sandwich microstructure;    Electromagnetic wave absorbing property;   

DOI  :  10.1016/j.jallcom.2017.04.070

来源: Elsevier

【 摘 要 】

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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