Structure design and interlocking construction are expected to generate desirable mechanical properties of advanced carbon nanotube (CNT) film for their impact protective applications. However, inadequate orientation and weak interlocking network often suffer from the large difference between the measured and theoretical mechanical properties. Here, we introduce a bioinspired nano-fishnet construction strategy to accurate control of the alignment and interlocking state of CNT in the film. The strategy creates an aligned and densified structure as well as strong interlocking network via coordinated regulation of stretching and p^- phenylene benzobisoxazole (PBO) infiltration. The developed PBO-CNT film shows excellent dynamic mechanical properties with a dynamic tensile strength of 4.92 ± 0.2 GPa, and toughness of 118.96 ± 9.78 MJ·m^-3 with the ability to support weights up to 166,667 times its own. In addition, the relationship of structural regulation strategies and enhancement mechanisms of composite PBO-CNT film have been further revealed. This work establishes a structural design paradigm for optimizing the dynamic performance of carbon-based materials in protection management.

Wireless communication technology is indispensable in our daily lives, but it also results in serious electromagnetic radiation pollution. Hence, developing smart electromagnetic interference shielding materials with adjustable electromagnetic wave (EMW) responses holds significant promise for future electromagnetic shielding devices. In this study, we propose an electromagnetic shielding switch (ESS) characterized by tunable electromagnetic shielding performance achieved by fabricating a three-dimensional (3D) carbon nanotube-based spacer fabric (CNT-SF) and modifying CNT-SF with chemical vapor deposition (CCNT-SF). The CCNT-SF displays direction-dependent electrical conductivity by manipulating the warp and weft density, measuring 128 S/m transversely and 447 S/m vertically. This characteristic allows the CCNT-SF to transmit or shield EMW by adjusting the angle of EMW incidence through fabric rotation, resulting in anisotropic electromagnetic shielding performance (33 dB transversely and 87 dB vertically). This feature enables switchable shielding with an on/off ratio of 2.64. Furthermore, the unique 3D structure confers excellent mechanical properties on the fabric, with compressive strength reaching 120 kPa. As a flexible, lightweight, and mechanically robust ESS, the CCNT-SF holds promising prospects for mitigating the challenges of increasingly severe and intricate electromagnetic environments.