ELECTROMAGNETIC SHIELDING EFFECTIVENESS OF GNP/CNT/EP COMPOSITE FILMS

Abstract

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

CLC Number:

TB332

XING Yi-long, ZHAO Xin, LI Meng. ELECTROMAGNETIC SHIELDING EFFECTIVENESS OF GNP/CNT/EP COMPOSITE FILMS[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(1): 52-57.

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