Excellent Terahertz shielding performance of ultrathin flexible Cu/graphene nanolayered composites with high stability

Shengyue Hou¹，Wenle Ma¹，Guanghao Li¹，Yi Zhang²，Yunyun Ji³，Fei Fan³，Yi Huang¹

1. National Institute for Advanced Materials, Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Key Laboratory of Functional Polymer Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Materials Science and Engineering, Nankai University2. Beijing Institute of Aeronautical Materials3. Institute of Modern Optics, Nankai University

摘 要：Electromagnetic interference(EMI) shielding at Terahertz(THz) frequency range attracts increasing attention due to the rapid development of THz science and technologies. EMI shielding materials with small thickness, high shielding effectiveness(SE), good flexibility and stability are highly desirable. Herein,an ultrathin flexible copper/graphene(Cu/Gr) nanolayered composite are prepared, which can reach the average EMI SE of 60.95 dB at 0.1–1.0 THz with a thickness of only 160 nm, indicating that more than 99.9999% of the THz wave power can be shielded. Furthermore, the Cu/Gr nanolayered composite also exhibits excellent oxidation resistance, with a 93.09% maintenance rate for EMI SE value after heating at 120℃ for 3 h in air, far higher than that of the bare Cu film(62.15%). Besides, the Cu/Gr nanolayered composite exhibits good mechanical flexibility and flexural fatigue resistance. The EMI SE value of the Cu/Gr nanolayered composite shows a maintenance rate of 98.87% even after 1500 times bending cycles, obviously higher than that of multilayer Cu film(93.07%). These results demonstrate that the ultrathin flexible Cu/Gr nanolayered composites with excellent shielding performance and good stability have a broad application prospect in THz shielding for wearable devices and next generation mobile communication equipment.

关键词：