Ultrathin, Ultralight, and Anisotropic Ordered Reduced Graphene Oxide Fiber Electromagnetic Interference Shielding Membrane

Abstract Developing an electromagnetic interference (EMI) shielding material with lightweight, ultrathin, and high‐performance complex electromagnetic wave pollution has become a research trend. Here, a novel ultrathin ordered reduced graphene oxide fiber (oRGOF) membranes are reported with wrinkles, grooves, and hierarchical structure by a simple assembly process based on wet spinning. The results show that the oRGOF membranes have obvious anisotropic conductivity and directional electromagnetic shielding properties. The measured electrical conductivity along the fiber axial direction (0°) is higher than that along the fiber radial direction (90°). Furthermore, the EMI shielding performance difference under different rotation angles is more than 25 dB (31.0 dB at 0°, 4.9 dB at 90°). The thickness of the resultant oRGOF membrane is 0.03 mm and area density of 0.9 mg cm⁻², and the specific EMI SE (SSE/t) is 33333 dB cm² g⁻¹ along the fiber axis. The oRGOF membranes show flexible and durable performance under repeated bending and straightening cycles tests over 160 times, without significant reduction of the shielding performance. Thus, the ultrathin, ultralight, and anisotropic oRGOF electromagnetic interference shielding membrane have broad prospects for both civilian and military applications.