CoFe2O4-Co3Fe7纳米粒子及CoFe2O4/多孔碳的制备及其电磁性能研究

doi:10.11901/1005.3093.2020.328

材料研究学报

2021, Vol. 35

Issue (4): 302-312 DOI: 10.11901/1005.3093.2020.328

研究论文

本期目录 | 过刊浏览

CoFe₂O₄-Co₃Fe₇纳米粒子及CoFe₂O₄/多孔碳的制备及其电磁性能研究

李万喜(

), 杜意恩, 郭芳, 陈勇强

晋中学院化学化工系晋中 030619

Preparation and Electromagnetic Properties of CoFe₂O₄-Co₃Fe₇ Nanoparticles and CoFe₂O₄/Porous Carbon

LI Wanxi(

), DU Yi'en, GUO Fang, CHEN Yongqiang

Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, China

引用本文:

李万喜, 杜意恩, 郭芳, 陈勇强. CoFe₂O₄-Co₃Fe₇纳米粒子及CoFe₂O₄/多孔碳的制备及其电磁性能研究[J]. 材料研究学报, 2021, 35(4): 302-312.
Wanxi LI, Yi'en DU, Fang GUO, Yongqiang CHEN. Preparation and Electromagnetic Properties of CoFe₂O₄-Co₃Fe₇ Nanoparticles and CoFe₂O₄/Porous Carbon[J]. Chinese Journal of Materials Research, 2021, 35(4): 302-312.

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摘要:

在5% H₂+95% N₂气氛下，还原CoFe₂O₄纳米粒子制备了CoFe₂O₄-Co₃Fe₇纳米粒子；以焙烧黄麻纤维得到的多孔碳纤维为碳源用水热法将CoFe₂O₄纳米粒子负载到多孔碳中，制备出CoFe₂O₄/多孔碳。使用X射线衍射仪、扫描电子显微镜、透射电子显微镜、拉曼光谱仪、同步热分析仪等手段对材料进行表征，并使用矢量网络分析仪测量了复合材料的电磁参数和微波吸收性能。结果表明，CoFe₂O₄-Co₃Fe₇纳米粒子和CoFe₂O₄/多孔碳的微波吸收性能明显优于CoFe₂O₄纳米粒子。CoFe₂O₄-Co₃Fe₇纳米粒子的有效频宽(反射损耗<-10 dB的频率宽度)可达4.8 GHz。CoFe₂O₄/多孔碳的有效频宽可达6 GHz，覆盖了整个Ku波段(12~18 GHz)。这些材料优异的微波吸收性能，可归因于合适的介电常数、大的介电损耗、多孔结构以及介电损耗和磁损耗的协同作用。

关键词 ：复合材料, 微波吸收性能, 水热法, CoFe₂O₄纳米粒子, 黄麻纤维, CoFe₂O₄/多孔碳

Abstract：

CoFe₂O₄-Co₃Fe₇ nanoparticles were successfully prepared by reducing CoFe₂O₄ nanoparticles in 5% H₂ + 95% N₂. Meanwhile, CoFe₂O₄ nanoparticles were successfully loaded onto the porous carbon by hydrothermal method with the porous carbon fiber calcined from jute fiber as precursor. The prepared two composites were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectrometer, and simultaneous thermal analyzer (STA). Their electromagnetic parameters and microwave absorption performances were measured by vector network analyzer (VNA). The results show that the microwave absorption performances of CoFe₂O₄-Co₃Fe₇ nanoparticles and CoFe₂O₄/porous carbon are obviously better than that of the plain CoFe₂O₄ nanoparticles. The effective bandwidth (frequency width of reflection loss <-10 dB) of CoFe₂O₄-Co₃Fe₇ nanoparticles is 4.8 GHz, while that of CoFe₂O₄/porous carbon can reach 6 GHz, covering the entire Ku band (12~18 GHz). The excellent microwave absorption performance can be attributed to the appropriate dielectric constant, large dielectric loss, porous structure, and the synergistic effect of dielectric loss and magnetic loss. Owing to the characteristics of low cost, low density and good microwave absorption performance, the CoFe₂O₄/porous carbon has broad application prospect for Ku band as an economic, lightweight and broadband microwave absorbent.

Key words： composites microwave absorption performance hydrothermal method CoFe₂O₄ nanoparticles jute fiber CoFe₂O₄/porous carbon

收稿日期: 2020-08-07

ZTFLH:

TB332

基金资助:山西省高校科技创新项目(2019L0883);山西省“1331工程”重点创新团队(PY201817);晋中学院“1331工程”重点创新团队(jzxycxtd2019005)

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图1 CF、CF500和CF600的XRD谱

图2 CF、CF500和CF600的SEM和TEM照片

图3 不同频率下石蜡中CF、CF500和CF600的含量为75%时的反射损耗图

图4 石蜡中CF、CF500和CF600的含量为75%时的复介电常数、复磁导率和损耗因子

图5 石蜡中CF、CF500和CF600的含量为75%时的特征阻抗和衰减系数

图6不同频率下石蜡中CF500和CF600含量50 ％时的反射损耗

图7 石蜡中CF500和CF600含量50%时的复介电常数、复磁导率、损耗因子、Cole-Cole曲线(ε′对ε")以及C0值

图8 CoFe2O4/多孔碳的XRD谱和拉曼谱

图9 CoFe2O4/多孔碳的SEM照片和CoFe2O4/多孔碳上CoFe2O4纳米粒子的TEM照片

图10 CoFe2O4/多孔碳在空气气氛下的热重曲线

图11 不同频率下CoFe2O4/多孔碳的反射损耗、复介电常数、复磁导率和损耗因子

表1 一些微波吸收材料的性能

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