Excellent Terahertz shielding performance of ultrathin flexible Cu/graphene nanolayered composites with high stability
Excellent Terahertz shielding performance of ultrathin flexible Cu/graphene nanolayered composites with high stability
复制标题
高稳定性超薄柔性铜/石墨烯纳米层状复合材料具有优异的太赫兹屏蔽性能
DOI：
10.1016/j.jmst.2020.04.007
复制
发表时间：
2020-09-01
影响因子：
10.9
通讯作者：
Huang, Yi
中科院分区：
文献类型：
--
作者：
Hou, Shengyue;Ma, Wenle;Huang, Yi
随着太赫兹（THz）科学技术的迅速发展，THz频段的电磁干扰（EMI）屏蔽越来越受到人们的关注。具有小厚度、高屏蔽效能（SE）、良好柔性和稳定性的EMI屏蔽材料是非常期望的。本文制备了超薄柔性铜/石墨烯（Cu/Gr）纳米层复合材料，其厚度仅为160 nm，在0.1-1.0 THz范围内平均EMI SE可达60.95 dB，表明可以屏蔽99.9999%以上的THz波功率。此外，Cu/Gr纳米复合材料还表现出优异的抗氧化性能，在120 ℃空气中加热3 h后，EMI SE值保持率为93.09%，远高于裸Cu膜的62.15%。此外，Cu/Gr纳米复合材料具有良好的机械柔性和抗弯曲疲劳性能。Cu/Gr纳米复合材料的EMI SE值在1500次弯曲循环后保持率为98.87%，明显高于多层Cu膜的EMI SE值（93.07%）。这些结果表明，Cu/Gr纳米复合材料具有优异的屏蔽性能和良好的稳定性，在可穿戴设备和下一代移动的通信设备的THz屏蔽方面具有广阔的应用前景。(C)2020由Elsevier Ltd代表Journal of Materials Science & Technology编辑部出版。
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 degrees C 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. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.