A highly flexible and porous graphene-based hybrid film with superior mechanical strength for effective electromagnetic
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A highly flexible and porous graphene‑based hybrid film with superior mechanical strength for effective electromagnetic interference shielding Tong Guo1 · Changgeng Li1 · Yue Wang2 · Yi Wang2 · Jianling Yue2 · Xiu‑Zhi Tang2 Received: 14 July 2020 / Accepted: 1 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract There is usually a tough trade-off between the mechanical property and the shielding performance in electromagnetic interference shielding (EMI) materials, especially for those ultrathin and porous film-based devices. Herein, we report an ultrathin and flexible RGO/CNF@Ag–Fe3O4 (RGCF) porous film for EMI shielding application by a vacuum-assisted filtration method and a hydrazine-induced foaming process. The RGCF-3 porous film exhibits outstanding mechanical properties with a tensile strength of 175.5 MPa. As expected, the EMI shielding effectiveness of the lightweight RGCF-3 porous film (21.0 dB) is much higher than that of the compact film (10.4 dB), due to the improved efficient wave attenuation within the cellular space. Therefore, the flexible and lightweight RGCF porous film with applicable EMI shielding and superior mechanical strength is highly promising for applications in wearable electronics. Keywords Reduced graphene oxide (RGO) composites film · Porous film · Mechanical properties · Electromagnetic interference shielding
1 Introduction Electromagnetic interference (EMI) shielding materials play a vital role in controlling or reducing electromagnetic radiation pollution, which severely affects human health and the normal function of sensitive electronic equipment and systems [1–4]. Especially, with the rapid development of portable devices and wearable electronics, the newly developed EMI shielding materials are required to be lightweight, thinner, flexibility and high shielding effectiveness (SE) [5, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-03965-w) contains supplementary material, which is available to authorized users. * Yi Wang [email protected] * Xiu‑Zhi Tang [email protected] 1
School of Physics and Electronics, Central South University, Changsha 410083, China
School of Aeronautics and Astronautics, Hunan Key Laboratory of Advanced Fibers and Composites, Central South University, Changsha 410083, China
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6]. Nevertheless, it is a big challenge to satisfy these characteristics simultaneously in practical applications. Recently, carbonaceous films fabricated from carbon nanotubes (CNTs), carbon nanofibers (CNFs), and graphene are very promising to be flexible EMI shielding devices for their peculiarities of flexibility, component tunability, and high electrical conductivity [7, 8]. The reflection mechanism usually takes a dominant position in carbonaceous films, whereas it usually results in secondary pollution [9, 10]. Therefore, the development of shielding materials integrated multiple defense mechanisms seems to be fairly important [11]. The incident electromagnetic waves (EWs
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