Citation: LI Guo-Min, ZHU Bao-Shun, LIANG Li-Ping, TIAN Yu-Ming, LÜ Bao-Liang, WANG Lian-Cheng. Core-Shell Co₃Fe₇@C Composite as Efficient Microwave Absorbent[J]. Acta Physico-Chimica Sinica, ;2017, 33(8): 1715-1720. doi: 10.3866/PKU.WHXB201704174 shu

Core-Shell Co₃Fe₇@C Composite as Efficient Microwave Absorbent

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 Date: 6 December 2016
Revised Date: 3 April 2017

Fund Project: The project was supported by the Doctoral Scientific Research Foundation of Taiyuan University of Science and Technology, China (20152030).

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.
- Core-shell structure,
- Composite,
- Lightweight,
- Microwave absorption
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沈阳化工大学材料科学与工程学院沈阳 110142

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通讯作者: 陈斌, bchen63@163.com

Core-Shell Co₃Fe₇@C Composite as Efficient Microwave Absorbent