Hierarchical construction of CNT networks in aramid papers for high-efficiency microwave absorption
You Wu1,§, Li Chen2,§, Yixuan Han3, Panbo Liu3, Haihong Xu1, Guanze Yu1, Yingying Wang4, Tao Wen4, Wenbo Ju1(), Junwei Gu3()
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China
Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
School of Emergent Soft Matter, South China University of Technology, Guangzhou 510640, China
§ You Wu and Li Chen contributed equally to this work.
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Layer-by-layer self-assembly technique is used to coat the surface of meta-aramid fibers and fibrils with carbon nanotubes (CNTs), providing novel raw materials for large-scale production of CNT incorporated aramid papers via papermaking. The composite paper, which contains abundant heterogeneous interfaces and hierarchical conductive networks, achieves high-efficiency microwave absorption in the entire X-band.
Abstract
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.
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Wu Y, Chen L, Han Y, et al. Hierarchical construction of CNT networks in aramid papers for high-efficiency microwave absorption. Nano Research, 2023, 16(5): 7801-7809. https://doi.org/10.1007/s12274-023-5522-4
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