Hierarchical construction of CNT networks in aramid papers for high-efficiency microwave absorption

作者：Wu, You; Chen, Li; Han, Yixuan; Liu, Panbo; Xu, Haihong; Yu, Guanze; Wang, Yingying; Wen, Tao; Ju, Wenbo^*; Gu, Junwei^*

来源：Nano Research, 2023, 16(5): 7801-7809.

DOI：10.1007/s12274-023-5522-4

• layer-by-layer self-assembly
• aramid fiber
• carbon nanotube (CNT)
• composite paper
• radar absorbing materials

Carbon nanotubes (CNTs) incorporated polymeric composites have been extensively investigated for microwave absorption at target frequencies to meet the requirement of radar cross-section reduction. In this work, a strategy of efficient utilization of CNT in producing CNT incorporated aramid papers is demonstrated. The layer-by-layer self-assembly technique is used to coat the surfaces of meta-aramid fibers and fibrils with CNT, providing novel raw materials available for the large-scale papermaking. The hierarchical construction of CNT networks resolves the dilemma of increasing CNT content and avoiding the agglomeration of CNT, which is a frequent challenge for CNT incorporated polymeric composites. The composite paper, which contains abundant heterogeneous interfaces and long-range conductive networks, is capable of reaching a high permittivity and dielectric loss tangent at a low CNT loading, and its complex permittivity is, so far, adjustable in the range of (1.20-j0.05) to (25.17-j18.89) at 10 GHz. Some papers with optimal matching thicknesses achieve a high-efficiency microwave absorption with a reflection loss lower than -10 dB in the entire X-band.

• 单位
  西北工业大学