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Acta Physico-Chimica Sinca  2017, Vol. 33 Issue (8): 1715-1720    DOI: 10.3866/PKU.WHXB201704174
ARTICLE     
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 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
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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 wordsCore-shell structure      Composite      Lightweight      Microwave absorption     
Received: 06 December 2016      Published: 17 April 2017
MSC2000:  O64  
  TQ050.4+3  
Fund:  The project was supported by the Doctoral Scientific Research Foundation of Taiyuan University of Science and Technology, China(20152030)
Corresponding Authors: Yu-Ming TIAN,Lian-Cheng WANG     E-mail: tym1654@126.com;wanglc@sxicc.ac.cn
Cite this article:

Guo-Min LI,Bao-Shun ZHU,Li-Ping LIANG,Yu-Ming TIAN,Bao-Liang LÜ,Lian-Cheng WANG. Core-Shell Co3Fe7@C Composite as Efficient Microwave Absorbent. Acta Physico-Chimica Sinca, 2017, 33(8): 1715-1720.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201704174     OR     http://www.whxb.pku.edu.cn/Y2017/V33/I8/1715

 
 
 
 
SampleFilling rate/% (w)Effective bandwidth/GHzCoating thickness/mmRef.
FeCo-CF303.91.322
CoNi-C504.12.523
Fe2O3-MWNTs/PBO303.23.024
Co3O4@C@PGC503.92.111
Fe2O3@CoFe2O4505.02.025
CoFe2O4-Co3Fe7675.21.326
FeCo-CFs203.11.327
Co3Fe7@C154.12this work
 
 
 
 
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