The nano-porous structure of CNT film severely limits the penetration of polymer resin for advanced composites. To solve this critical issue, we propose a method which could not only uniformly infiltrate resin into CNT films along thickness direction but also ensure sufficient polymer penetration for the fabrication of CNT film/epoxy composites. The resultant composites revealed an outstanding improvement of 352% and 664% accordingly for tensile strength and Young’s modulus. It also showed 8 times enhancement of tensile toughness compared to that of the pristine CNT film. Furthermore, the high sensitivity (gauge factor ∼ 4.6) with a linear piezo resistive response within a large strain (∼ 5%) and the stable sensing reversibility, demonstrated the excellent strain sensing properties of the produced composites. Therefore, our study innovatively proposes this vacuum-assisted filtration method to obtain the strong fibre-matrix interface interaction inside the dense CNT assemblies as well as other nanomaterials.

CNT膜的纳米孔结构严重限制了聚合物树脂对高级复合材料的渗透。为了解决这个关键问题，我们提出了一种方法，该方法不仅可以沿厚度方向将树脂均匀地渗透到CNT膜中，而且还可以确保足够的聚合物渗透性来制造CNT膜/环氧树脂复合材料。所得复合材料的抗张强度和杨氏模量相应地显着提高了352％和664％。与原始CNT膜相比，它还显示出8倍的拉伸韧性。此外，在大应变（〜5％）内具有线性压电电阻响应的高灵敏度（规格系数〜4.6）和稳定的感测可逆性，证明了所生产复合材料的优异应变感测性能。所以，