用于高效电磁屏蔽的多层超薄 MXene@AgNW@MoS2 复合膜,ACS Applied Materials & Interfaces

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用于高效电磁屏蔽的多层超薄 MXene@AgNW@MoS2 复合膜
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-20 , DOI: 10.1021/acsami.2c18759
Youqiang Xing _{1,

2} , Yizhi Wan ₁ , Ze Wu ₁ , Jianqiao Wang ₁ , Songlong Jiao ₁ , Lei Liu ₁

Affiliation

结构和材料成分对于实现高电磁干扰 (EMI) 屏蔽效能 (SE) 至关重要。在此，超薄 MXene@AgNW@MoS ₂通过真空辅助抽滤工艺和原子层沉积 (ALD) 工艺制备出类似于五花肉结构并具有出色 EMI 屏蔽性能的 (MAM) 复合薄膜。交错排列的 AgNW 形成骨架并散布在 MXene 片中以构建具有三维网络结构的掺杂层，从而提高薄膜的导电性。基于 Ag 在掺杂层和单层中的最佳分散浓度，MXene/AgNW 掺杂层和 AgNW 单层交替进行真空辅助过滤，以获得具有多个异质界面的层状结构。这些界面会产生界面极化并增加多次反射和散射，从而导致电磁 (EM) 波损耗增加。另一方面，MoS ₂ALD精密制备的外层纳米层，有效提高了电磁波的吸收比例，减少了二次反射，提高了EMI屏蔽性能的稳定性。最终，具有五个交替内层和 MoS ₂外层的超薄 MAM 薄膜（厚度为 0.03 毫米）在 X 波段表现出 86.3 dB 的出色 EMI SE。

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Multilayer Ultrathin MXene@AgNW@MoS2 Composite Film for High-Efficiency Electromagnetic Shielding

Structure and material composition is crucial in realizing high electromagnetic interference (EMI) shielding effectiveness (SE). Herein, an ultrathin MXene@AgNW@MoS₂ (MAM) composite film that resembles the structure of a pork belly and exhibits superior EMI shielding performance was fabricated via the vacuum-assisted suction filtration process and atomic layer deposition (ALD). The staggered AgNWs form skeletons and intersperse in MXene sheets to build a doped layer with three-dimensional network structures, which improves the electrical conductivity of the film. Based on the optimal dispersion concentration of Ag in doped and single layers, the MXene/AgNW doped layer and AgNW single layer are alternately vacuum-assisted-filtered to obtain laminated structures with multiple heterogeneous interfaces. These interfaces generate interface polarization and increase multiple reflection and scattering, resulting in the increased electromagnetic (EM) wave losses. On the other hand, MoS₂ outer nanolayers fabricated precisely by ALD effectively increases the absorption proportion of electromagnetic waves, reduces the secondary reflection, and improves the stability of EMI shielding properties. Ultimately, an ultrathin MAM film (a thickness of 0.03 mm) with five alternating internal layers and MoS₂ outer layers exhibits an excellent EMI SE of 86.3 dB in the X-band.

更新日期：2023-01-20

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