Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (8): 1715-1720.doi: 10.3866/PKU.WHXB201704174

• ARTICLE • Previous Articles    

Core-Shell Co3Fe7@C Composite as Efficient Microwave Absorbent

Guo-Min LI1,Bao-Shun ZHU1,Li-Ping LIANG1,Yu-Ming TIAN1,*(),Bao-Liang LÜ2,Lian-Cheng WANG2,*()   

  1. 1 School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, P. R. China
    2 Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China
  • Received:2016-12-06 Published:2017-06-14
  • Contact: Yu-Ming TIAN,Lian-Cheng WANG E-mail:tym1654@126.com;wanglc@sxicc.ac.cn
  • Supported by:
    The project was supported by the Doctoral Scientific Research Foundation of Taiyuan University of Science and Technology, China(20152030)

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Abstract:

To reduce the density of the absorbent Co3Fe7, a core-shell Co3Fe7@C microwave absorbent was synthesized by preparing an iron/cobalt-containing carbon precursor followed by high-temperature carbonization. According to the X-ray diffraction (XRD) and transmission electron microscopy (TEM) results, Co3Fe7 particles were coated with graphitized carbon layers to form a core-shell structure. Furthermore, the Co3Fe7@C composite with a surface area and density of 358.5 m2·g-1 and 2.25 g·cm-3, respectively, exhibited excellent microwave absorbability. A minimum reflection loss (RL) of -43.5 dB and an effective bandwidth (RL below -10 dB) of 4.1 GHz were obtained at the coating thickness of 2 mm, which could be mainly attributed to the effective impedance match and multiple interfacial polarizations. Owing to the low density and remarkable microwave absorption, we believe that the Co3Fe7@C composite can be a promising candidate for use as a lightweight and efficient microwave absorbent.

Key words: Core-shell structure, Composite, Lightweight, Microwave absorption