In this work, a new type of carbon fiber reinforced polymer (CFRP) composite was fabricated by introducing MXene nanoparticles onto the surface of carbon fibers (CF) via electrophoretic deposition (EPD) followed by thermal annealing. The MXene-reinforced CF/epoxy composites displayed enhanced mechanical properties and electrical conductivity as well as in-situ damage sensing capability. The uniformly deposited MXene nanoparticles contributed to a considerable enhancement of the flexural strength of CFRPs through hydrogen bonding and mechanical interlocking. The thermal annealing treatment reduced the amount of oxygen groups on the surface of MXene nanoparticles and enabled a 66 % increase of the out-of-plane electrical conductivity and a 20 % improvement of the electromagnetic interference (EMI) shielding effectiveness. The exceptional EMI performance of the core-shell hierarchical microstructure can be ascribed to the polarization of the inhomogeneous interfaces, the dipole polarization, and the conductive loss effect as a result of the presence of annealed MXenes on the surface of CFs.

在这项工作中，通过电泳沉积（EPD）将 MXene 纳米颗粒引入碳纤维（CF）表面，然后进行热退火，制备了一种新型碳纤维增强聚合物（CFRP）复合材料。MXene 增强的 CF/环氧树脂复合材料表现出增强的机械性能和导电性以及原位损伤传感能力。均匀沉积的 MXene 纳米粒子通过氢键和机械互锁大大提高了 CFRP 的弯曲强度。热退火处理减少了 MXene 纳米粒子表面的氧基团数量，使面外电导率提高了 66%，电磁干扰 (EMI) 屏蔽效能提高了 20%。核壳分层微结构的卓越 EMI 性能可归因于 CF 表面存在退火 MXene 所导致的不均匀界面的极化、偶极子极化以及传导损耗效应。