Three kinds of carbon-based fillers (thermally reduced graphene oxide-carbon nanotubes (TG-CN), chemically reduced graphene oxide-carbon nanotubes (RG-CN), graphene nanoplates-carbon nanotubes (GN-CN)) were synthesized. Their corresponding foams were fabricated by combined process of compression-molding and batch-foaming. While GN-CN/PMMA composite foams presented the bimodal microcellular structure, composite foams with RG-CN and TG-CN hybrids still shown typical unimodal cell-size distribution. Much higher electrical conductivity and electromagnetic interference shielding efficiency (EMI SE) were achieved in the TG-CN/PMMA foams, which is closely associated with high intrinsic electrical conductivity and thin hierarchical structure of TG-CN hybrids. Specifically, a prominent electrical conductivity of 2.92 S/m and an absorption-dominated EMI-SE of more than 30 dB in the X-band were achieved in the lightweight TG-CN/PMMA foams (∼0.65 g/cm³) at 10 wt% loading. These results demonstrate the TG-CN hybrids are highly promising nanofillers which could endow the composite foams with superior conductive and mechanical performance towards outstanding EMI-shielding application.

合成了三种碳基填料（热还原氧化石墨烯-碳纳米管（TG-CN），化学还原氧化石墨烯-碳纳米管（RG-CN），石墨烯纳米板-碳纳米管（GN-CN））。它们的相应泡沫是通过压缩成型和分批发泡的组合工艺制成的。尽管GN-CN / PMMA复合泡沫呈现双峰微孔结构，但具有RG-CN和TG-CN杂化体的复合泡沫仍显示出典型的单峰孔尺寸分布。TG-CN / PMMA泡沫材料具有更高的电导率和电磁干扰屏蔽效率（EMI SE），这与TG-CN杂化体的高固有电导率和薄层次结构密切相关。具体而言，显着的导电率为2。³）在10重量％的负载下。这些结果表明，TG-CN杂化材料是非常有前途的纳米填料，可以赋予复合泡沫以优异的导电性和机械性能，以实现出色的EMI屏蔽应用。