带扣的AgNW / MXene混合分层海绵，用于高性能电磁干扰屏蔽。,Nanoscale

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带扣的AgNW / MXene混合分层海绵，用于高性能电磁干扰屏蔽。
Nanoscale ( IF 5.8 ) Pub Date : 2019-10-29 , DOI: 10.1039/c9nr07988b
Chuanxin Weng ₁ , Guorui Wang ₂ , Zhaohe Dai ₃ , Yongmao Pei ₄ , Luqi Liu ₂ , Zhong Zhang ₂

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电磁干扰（EMI）屏蔽材料的发展正在朝着轻量化和显示高性能的方向发展。在这里，我们报道了一种轻量级的银纳米线（AgNW）/ MXene混合海绵，其特征是通过浸涂和单向冷冻干燥相结合制成的分层结构。选择设计为带扣结构的商用三聚氰胺甲醛海绵（MF）作为用AgNW层（BMF / AgNW）进行涂层的模板。此外，由MXene组装的细胞壁组成的其他不规则蜂窝结构是通过MXene水性悬浮液的单向冷冻干燥引入到BMF细胞基质内部的。因此，BMF / AgNW具有更好的EMI屏蔽效果，为40。与MF / AgNW相比，导电网络以及多次反射和散射贡献了0 dB。最终，所得的AgNW / MXene混合海绵展现出52.6 dB的更高EMI屏蔽效果，而低密度为49.5 mg cm由于AgNW和MXene在电导率和分层结构方面的协同作用，与BMF / AgNW相比，^-3。这些结果还提供了一种新颖的方式来制造轻质和导电海绵作为高性能EMI屏蔽材料。

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Buckled AgNW/MXene hybrid hierarchical sponges for high-performance electromagnetic interference shielding.

The development of electromagnetic interference (EMI) shielding materials is moving forward towards being lightweight and showing high-performance. Here, we report on lightweight silver nanowire (AgNW)/MXene hybrid sponges featuring hierarchical structures that are fabricated by a combination of dip-coating and unidirectional freeze-drying methods. The commercial melamine formaldehyde sponges (MF), designed with a buckled structure, are chosen as the template for coating with the AgNW layer (BMF/AgNW). Furthermore, the additional irregular honeycomb architecture composed of MXene assembled cell walls is introduced inside the BMF cell–matrix through unidirectional freeze-drying of MXene aqueous suspensions. Consequently, the BMF/AgNW presents a better EMI shielding effectiveness of 40.0 dB contributed by the conductive network and multiple reflections and scattering compared with the MF/AgNW. Eventually, the resulting AgNW/MXene hybrid sponge exhibits a higher EMI shielding effectiveness of 52.6 dB with a low density of 49.5 mg cm⁻³ compared with the BMF/AgNW due to synergetic effects of the AgNW and MXene both in conductivity and hierarchical structure. These results also provide a novel way to fabricate lightweight and conductive sponges as high-performance EMI shielding materials.

更新日期：2019-10-29

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