Interface design is an effective strategy for developing advanced composite materials, especially nanocomposites with optimized structural nanointerfaces with better properties. Herein, smart orthogonally structured graphene (OSG) nanointerfaces with designed multi-functions were fabricated for the first time in three-dimensional (3D) SiC nanowires (SiCnw) foam to yield hybrid nano-preforms. The as-obtained OSG nanointerfaces showed excellent electrical conductivity and unique orthogonal structure, which did not only act as highways for electron transport but also as smart interfacial energy traps for the capture and deflection of cracks. Hence, hybrid nano-preforms provided dual outstanding advantage over conventional SiCnw foam for reinforcing pyrocarbon (PyC) and yield materials with higher mechanical strength and electromagnetic-interference (EMI) shielding effectiveness. Compared to baseline without nanointerface, the 0.12 wt% OSG nanointerface significantly increased the flexural strength and EMI shielding effectiveness by 101% and 54%, respectively. These findings demonstrated the promising prospects of OSG nanointerface as necessary components for advanced mechanical-strong and high-performance EMI shielding nanocomposites.

界面设计是开发高级复合材料的有效策略，尤其是具有优化结构且具有更好性能的纳米界面的纳米复合材料。本文中，首次在三维（3D）SiC纳米线（SiCnw）泡沫中制造了具有设计多功能的智能正交结构石墨烯（OSG）纳米界面，以生产混合纳米预成型坯。如此获得的OSG纳米界面显示出优异的电导率和独特的正交结构，不仅充当电子传输的高速公路，而且还充当用于捕获和偏转裂缝的智能界面能阱。因此，与传统的SiCnw泡沫相比，杂化纳米预成型件在增强热碳（PyC）方面提供了双重突出优势，并获得了具有更高机械强度和电磁干扰（EMI）屏蔽效果的材料。与没有纳米界面的基线相比，0.12 wt％的OSG纳米界面分别显着增加了101％和54％的抗弯强度和EMI屏蔽效果。这些发现证明了OSG纳米界面作为先进的机械强度高和高性能EMI屏蔽纳米复合材料的必要组件的广阔前景。