Flexible Aramid Nanofiber/Bacterial Cellulose/Graphene Papers with Nickel Nanoparticles for Enhanced Electromagnetic Interference Shielding and Joule Heating Performance
Yingjie Huo, Bochong Wang, Anmin Nie, Congpu Mu, Jianyong Xiang, Kun Zhai, Tianyu Xue, Fusheng Wen
Abstract
High-mechanical strength and flexible multifunctional composite films with superior electromagnetic interface (EMI) shielding and rapid-response Joule heating are of urgent demand for the development of wearable devices. Herein, we fabricated the aramid nanofibers (ANFs)/bacterial cellulose (BC)/graphene nanosheets (GNs)/nickel nanoparticles (Ni NPs) composite films via vacuum-assisted filtration followed by the electron beam evaporation method. Mechanical properties of ANF/BC composite papers could be tuned by changing the weight ratio of ANFs and BC. Benefiting from the outstanding electrical conductivity of the magnetic Ni NPs, the ANF/BC-3/GNs/Ni-300 composite film (ANF/BC-3 represents that the weight ratio of ANFs to BC is 7:3, and Ni-300 represents that the thickness of Ni is 300 nm) exhibited superior electrical conductivity up to 328 S/cm and displayed superb EMI shielding effectiveness exceeding 50 dB in the whole X band (8–12.4 GHz). Meanwhile, the EMI shielding effectiveness of the film could still be maintained above 40 dB after bending 1000 times by 150° due to the excellent tensile properties of ANF/BC-3 films. Furthermore, the ANF/BC-3/GNs/Ni-300 composite film also showed great Joule heating performance (135 °C at 5 V) with rapid response (<7 s), durability and repeatability (50 cycles), and long-term stability (1800 s) without obvious temperature fluctuation. These results showed that the ANF/BC-3/GNs/Ni-300 composite film could be used in intelligent wearable devices and maintain excellent electromagnetic shielding performances.