复合材料科学与工程 ›› 2021, Vol. 0 ›› Issue (1): 52-57.

• 应用研究 • 上一篇    下一篇

GNP/CNT/EP复合薄膜的电磁屏蔽性能研究

邢一龙, 赵欣, 李梦*   

  1. 中国民用航空飞行学院 航空工程学院,广汉618307
  • 收稿日期:2020-03-17 出版日期:2021-01-28 发布日期:2021-01-25
  • 通讯作者: 李梦(1978-),男,博士,教授,主要从事航空功能材料的制备及性能表征、新型航空材料开发、航空发动机机务工程等方面的研究,mokechi@163.com。
  • 作者简介:邢一龙(1989-),男,硕士研究生,主要从事航空功能性复合材料方面的研究。
  • 基金资助:
    中国民用航空飞行学院基金项目(CJ2018-01);中国航空油料有限责任公司科技项目(航油科技-201707);中国民航飞行学院成果转化基金(CJ2018-03);中国民用航空飞行学院研究生创新项目(X2019-004)

ELECTROMAGNETIC SHIELDING EFFECTIVENESS OF GNP/CNT/EP COMPOSITE FILMS

XING Yi-long, ZHAO Xin, LI Meng*   

  1. AEI, Civil Aviation Flight University of China, Guanghan 618307, China
  • Received:2020-03-17 Online:2021-01-28 Published:2021-01-25

摘要: 通过物理混合的方法制备了石墨烯(Graphene Nanoplatelets,简称“GNP”)与碳纳米管(Carbon Nanotubes,简称“CNT”)质量比为2∶1、1∶1、1∶2的石墨烯/碳纳米管(GNP/CNT)复合结构体,并通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)对其形貌进行了表征,结果表明:质量比为1∶1的复合结构体中CNT分布较均匀。通过Raman光谱、电阻率测试、沉降试验对其结构、导电性、分散性进行了表征,结果表明在GNP和CNT质量比为1∶1条件下制备的GNP/CNT复合结构体具有较小的缺陷密度、较小的电阻率和较好的分散性。通过环氧树脂(EP)真空浸渍的方法制备了GNP/CNT/EP复合薄膜,并利用矢量网络分析仪对其在2 GHz~18 GHz频率范围内进行了测试,研究了薄膜厚度、GNP和CNT质量比对屏蔽性能的影响,结果表明:GNP和CNT质量比为1∶1条件下制备的复合薄膜在带宽10 GHz频段内具有15 dB~20 dB的屏蔽效能,且电磁屏蔽效能主要为吸收损耗,可实现电磁波的绿色防护;在较宽频段内增加厚度可提升屏蔽效能。

关键词: 石墨烯, 碳纳米管, 环氧树脂, 复合薄膜, 电磁屏蔽, 复合材料

Abstract: The graphene nanoplatelets/carbon nanotubes (GNP/CNT) composite structure with mass ratio of graphene nanoplatelets to carbon nanotubes of 2∶1, 1∶1 and 1∶2 was prepared by physical mixing method, and its morphology was characterized by SEM and TEM. The results showed that CNT in the samples with mass ratio of 1∶1 were evenly distributed. Its structure, conductivity and dispersion were characterized and tested by Raman spectra, resistivity test and sedimentation test. The results show that the composite structure with the mass ratio of GNP to CNT of 1∶1 has smaller defect density, smaller resistivity and better dispersion. The GNP/CNT/EP composite film was prepared by means of impregnation with epoxy resin in vacuum condition, and were tested in the frequency range of 2 GHz~18 GHz by vector network analyzer. The effects of film thickness, GNP and CNT mass ratio on the shielding properties were also studied. The results show that the composite film with the mass ratio of GNP to CNT of 1∶1 has a shielding effectiveness of 15 dB~ 20 dB in the frequency band of 10 GHz, and the electromagnetic shielding effectiveness is mainly absorption loss, which can realize the green protection of electromagnetic wave. And increasing the thickness in a wide frequency band can improve the shielding effectiveness.

Key words: graphene, carbon nanotubes, epoxy resin, composite film, electromagnetic shielding, composites

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