Abstract
In this study, a novel ceramic composite with a graphene-CNTs-graphene sandwich structure is successfully synthesized. The parallel arranged graphene layers and carbon nanotubes (CNTs) possess a beneficial reflect-attenuate-reflect synergistic effect. This results in outstanding electromagnetic interference (EMI) shielding performance. The ε′ and tanδ of the sample with 5 vol% graphene and 0.5 vol% CNTs increase significantly, from 9.1 to 44 and 10−4 to 2.7, respectively. In addition to the reflection effect of graphene layers, multi-reflected electromagnetic waves are constantly attenuated by CNTs during propagation. The absorption loss (SEA) increases from nearly zero to 25 dB leading to an absorption-dominated EMI shielding effect and the highest total shielding effectiveness (SET) is 39 dB. The composites are thermal stable below 550 ℃ and the oxidation rate increases rapidly until the temperature exceeds 700 ℃. These results indicate G/CNT-Al2O3 with a sandwich structure is a promising EMI shielding material.
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