物理化学学报 >> 2017, Vol. 33 >> Issue (8): 1715-1720.doi: 10.3866/PKU.WHXB201704174

论文 上一篇    

基于核壳结构Co3Fe7@C的高效微波吸收材料

力国民1,朱保顺1,梁丽萍1,田玉明1,*(),吕宝亮2,王连成2,*()   

  1. 1 太原科技大学材料科学与工程学院,太原030024
    2 中国科学院山西煤炭化学研究所,炭材料重点实验室,太原030001
  • 收稿日期:2016-12-06 发布日期:2017-06-14
  • 通讯作者: 田玉明,王连成 E-mail:tym1654@126.com;wanglc@sxicc.ac.cn
  • 基金资助:
    太原科技大学博士科研启动基金(20152030)

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)

摘要:

为了降低吸波剂Co3Fe7的密度,本文采用原位聚合Fe3+-Co2+/碳前驱体及高温碳化制备得到Co3Fe7@C复合微波吸收材料。X射线衍射(XRD)和扫描电子显微镜(SEM)测试结果表明Co3Fe7颗粒被石墨碳层包覆形成核壳结构,复合物的比表面积和表观密度分别为358.5 m2·g-1、2.25 g·cm-3。核壳结构Co3Fe7@C复合物显示出优异的微波吸收性能,当涂层厚度为2 mm时,其最低反射损耗(RL)达到最低值-43.5 dB,对应的有效带宽为4.1 GHz,归因于复合物有效的阻抗匹配特性及多重界面极化效应。由于低密度及优异的微波吸收性能,Co3Fe7@C复合物有望作为一种潜在的轻质、高效微波吸收材料。

关键词: 核壳结构, 复合物, 轻质, 微波吸收

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

MSC2000: 

  • O64