Fabrication and properties of waste paper fiber reinforced flexible graphene-based multifunctional electromagnetic shielding film

Currently, electromagnetic interference (EMI) has become increasingly severe, urgently demanding the development of high-performance, lightweight, and environmentally friendly EMI shielding materials. Therefore, this study fabricated a flexible graphene film reinforced with waste paper fibers (GPFC) via high-speed shear mixing technology. This approach overcomes the challenges of poor film-forming ability in physically prepared graphene and the environmental issues associated with conventional chemical methods. The results showed that GPFC exhibited an EMI shielding effectiveness of 87.3 ​dB in the X-band, an in-plane thermal conductivity of up to 370 ​W/(m·K), and stable Joule heating performance. The addition of paper fibers significantly improved flexibility, enabling the material to twist up to 720° without fracture. This research not only achieves the efficient recycling of waste paper but also offers a viable pathway for developing ultra-thin, flexible, and high-performance EMI shielding materials.