Ge Hu, Gao Daming, Zhang Shudong, Liu Cui, Chen Liqing, Song Yanping, Li Zhao, Hong Na, Kang Jun, Song Zhihao, Wang Zhenyang, Li Nian
School of Energy Materials & Chemical Engineering, Hefei University, Hefei, Anhui 230601, China.
Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
ACS Appl Mater Interfaces. 2024 Dec 11;16(49):68144-68156. doi: 10.1021/acsami.4c13043. Epub 2024 Nov 24.
Smart electromagnetic interference (EMI) shielding materials with adjustable shielding efficiency (SE) hold immense importance in the field of wearable and switchable EMI shielding. However, existing materials often suffer from a constrained tunability range and inadequate stability. In this study, a highly stretchable conductive framework is fabricated by integrating Ni-doped laser-induced graphene (LIG/Ni) with silicone. Through meticulous manipulation of the LIG scanning trajectory and Ni nanoparticle (NP) deposition parameters, ordered and dense conductive pathways were formed. This ordered structure preserves the graphene's structural coherence and conductivity along the axis perpendicular to stretching, while graphene parallel to the stretching direction forms random connections, resulting in the effective regulation of electrical conductivity. Under a 200% strain, the electrical conductivity dropped to a minimum of 1.07 S/cm, and the average SE in the X-band was reduced to 2.33 dB. Upon strain release, the conductive network rapidly reconfigured, boosting conductivity to 63.6 S/m and an enhanced SE of 68.12 dB. With its highly reversible conductive network, this composite exhibits exceptional cycling stability and an expansive range of adjustable SE, thereby holding immense practical value for versatile electromagnetic protection applications.
具有可调节屏蔽效率（SE）的智能电磁干扰（EMI）屏蔽材料在可穿戴和可切换EMI屏蔽领域具有极其重要的意义。然而，现有材料往往存在可调范围受限和稳定性不足的问题。在本研究中，通过将镍掺杂的激光诱导石墨烯（LIG/Ni）与硅树脂集成，制备了一种高度可拉伸的导电框架。通过精心控制LIG扫描轨迹和镍纳米颗粒（NP）沉积参数，形成了有序且致密的导电通路。这种有序结构在垂直于拉伸方向的轴向上保持了石墨烯的结构连贯性和导电性，而平行于拉伸方向的石墨烯形成随机连接，从而有效调节了电导率。在200%应变下，电导率降至最低1.07 S/cm，X波段的平均SE降至2.33 dB。应变释放后，导电网络迅速重新配置，电导率提高到63.6 S/m，SE增强至68.12 dB。这种复合材料凭借其高度可逆的导电网络，展现出卓越的循环稳定性和宽广的可调SE范围，因此在多功能电磁防护应用中具有巨大的实用价值。
