School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Nanoscale. 2019 Mar 28;11(13):6080-6088. doi: 10.1039/c8nr10489a.
Environmentally friendly materials that exhibit high-performance electromagnetic interference (EMI) shielding are extremely necessary. Herein, we fabricated ultrathin Ti3C2Tx (U-Ti3C2Tx) MXene nanosheets (NS) by atomic-layer tailoring the layer thickness of Ti3C2Tx MXene. The U-Ti3C2Tx NS composites with highly efficient EMI shielding effectiveness can reduce secondary reflection, demonstrating its environmentally friendly performance. The U-Ti3C2Tx NS composite with 80 wt% loading exhibits an EMI shielding effectiveness of 58.1 dB at a thickness of 1 mm. Shielding performance analysis of different layer thicknesses shows that electron transport has an important contribution to the EMI shielding performance. Furthermore, the polarization induced by defects and terminal atoms plays an important role in the EMI shielding performance. Based on the electromagnetic (EM) wave response mechanism, a novel approach to effectively tune the EMI attenuation and shielding effectiveness can be achieved by adjusting the local conductive network. These findings will offer an effective strategy for designing environmentally friendly 2D materials with high-performance EMI shielding.
非常需要展示出高性能电磁干扰（EMI）屏蔽的环保材料。在此，我们通过原子层剪裁 Ti3C2Tx MXene 的层厚度，制备了超薄 Ti3C2Tx（U-Ti3C2Tx）MXene 纳米片（NS）。具有高效 EMI 屏蔽效能的 U-Ti3C2Tx NS 复合材料可以减少二次反射，表现出其环保性能。在厚度为 1 毫米时，负载 80wt%的 U-Ti3C2Tx NS 复合材料的 EMI 屏蔽效能达到 58.1dB。对不同层厚度的屏蔽性能分析表明，电子输运对 EMI 屏蔽性能有重要贡献。此外，由缺陷和末端原子引起的极化在 EMI 屏蔽性能中起着重要作用。基于电磁波（EM）波响应机制，通过调整局部导电网络，为有效调节 EMI 衰减和屏蔽效能提供了一种新方法。这些发现将为设计具有高性能 EMI 屏蔽的环保 2D 材料提供有效的策略。
