化工学报 ›› 2023, Vol. 74 ›› Issue (8): 3584-3596.DOI: 10.11949/0438-1157.20230607

• 材料化学工程与纳米技术 • 上一篇    下一篇

嵌有超小CeO2纳米粒子的碳纳米纤维的制备及其吸波性能

胡兴枝1(), 张皓焱1, 庄境坤1, 范雨晴1, 张开银2, 向军1()   

  1. 1.江苏科技大学理学院,江苏 镇江 212100
    2.武夷学院机电工程学院,福建 武夷山 354300
  • 收稿日期:2023-06-21 修回日期:2023-08-09 出版日期:2023-08-25 发布日期:2023-10-18
  • 通讯作者: 向军
  • 作者简介:胡兴枝(2000—),女,硕士研究生,1787425051@qq.com
  • 基金资助:
    福建省自然科学基金项目(2020J01393);江苏省研究生科研与实践创新计划项目(KYCX22-3816)

Preparation and microwave absorption properties of carbon nanofibers embedded with ultra-small CeO2 nanoparticles

Xingzhi HU1(), Haoyan ZHANG1, Jingkun ZHUANG1, Yuqing FAN1, Kaiyin ZHANG2, Jun XIANG1()   

  1. 1.School of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, Jiangsu, China
    2.College of Mechanical and Electrical Engineering, Wuyi University, Wuyishan 354300, Fujian, China
  • Received:2023-06-21 Revised:2023-08-09 Online:2023-08-25 Published:2023-10-18
  • Contact: Jun XIANG

摘要:

采用静电纺丝结合后续热处理制备了均匀镶嵌超小CeO2纳米颗粒的碳纳米纤维(CeO2@CNFs)复合材料,研究了CeO2含量对其电磁特性及吸波性能的影响和作用机制。结果表明,随CeO2含量的增加,复合材料的介电损耗及电磁衰减能力降低,但阻抗匹配得到有效改善,吸波能力呈先增强后减弱趋势。CeO2含量约为24.6%(质量)的CeO2@CNFs-2样品因电磁衰减能力与阻抗匹配的更好平衡而表现出最好的吸波性能。当在石蜡基质中的填充量仅为10%(质量),厚度为3.0 mm时,最小反射损耗(RL)值达到-45.4 dB,RL低于-10 dB的有效吸收带宽为5.6 GHz (9.1~14.6 GHz),可覆盖约75%的X波段和45%的Ku波段。CeO2@CNFs-2的吸波强度是纯CNFs的3.1倍,说明CNFs和CeO2两者的协同作用能有效提高该复合体系的吸波性能。

关键词: CeO2, 碳纳米纤维, 复合材料, 纳米结构, 微波吸收

Abstract:

Ultra-small CeO2 nanoparticles uniformly embedded in carbon nanofibers (CeO2@CNFs) composites were prepared by electrospinning and subsequent heat treatment. The effect and regulation mechanism of CeO2 content on the electromagnetic characteristics and microwave absorption properties of CeO2@CNFs were investigated in detail. It is found that with the increase of CeO2 content, the dielectric loss and electromagnetic attenuation ability of the composites decreases while the impedance matching is effectively improved, and the microwave absorption ability first increases and then weakens. The CeO2@CNFs-2 sample with a CeO2 content of about 24.6%(mass) exhibits the best microwave absorption performance due to its better balance between electromagnetic attenuation and impedance matching. When the filler loading is only 10%(mass) in paraffin wax matrix and the absorber thickness is 3.0 mm, the minimum reflection loss (RL) of CeO2@CNFs-2 reaches -45.4 dB at 10.7 GHz, and the effective absorption bandwidth (RL <-10 dB) is 5.6 GHz (9.1—14.6 GHz), covering approximately 75% of X-band and 45% of Ku-band. Notably, the microwave absorption intensity of CeO2@CNFs-2 is 3.1 times that of pure CNFs, indicating that the synergistic effect of both CNFs and CeO2 can effectively boost the microwave absorption performance of the composite.

Key words: CeO2, carbon nanofibers, composites, nanostructure, microwave absorption

中图分类号: