The electromagnetic interference (EMI) pollution problem has led to an increasing interest in the development of lightweight materials for effective SE. This paper presents a facile approach for the fabrication of flexible, ultrathin, foldable, rollable, and highly conductive carbon nanostructures (CNS)-based mats. CNS epoxy, CNS-Fe2O3 nanoparticles (NPs) heterojunction mats and clean CNS mats of various thickness made of CNS flakes 300–350μm long and of various width have been fabricated and tested for the SE application. Thinner CNS mats are found to have higher electrical and thermal conductivity. On the other hand, thicker CNS mats are found to have better SE performance, which reveals that thickness has a more profound impact on SE than electrical conductivity. Incorporation of the γ-Fe2O3 in the CNS mass provides magnetic properties and greatly improves the SE of the mats. Also, the uniform distribution of γ-Fe2O3 NPs increases the absorption of incident waves, which improves the overall shielding (SEAll). Thus, the SEAll performance improved from 47.1dB for the clean CNS mat to 60.29dB with the incorporation of γ-Fe2O3 NPs. Furthermore, the use of the epoxy to fabricate the CNS mats has significantly improved the mechanical properties of the CNS mats, but it reduced the SE performance by hindering the absorption of the electromagnetic waves.

Thin carbon nanostructure mat with high electromagnetic interference shielding performance

2019 Fall National Meeting

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