An engineered interphase can improve the mechanical properties of epoxy/glass composites simultaneously inducing a piezoresistive response. To prove this concept, E-glass fibers were coated with graphene oxide (GO) by electrophoretic deposition, while reduced graphene oxide (rGO) coated fibers were obtained by subsequent chemical reduction. The fiber-matrix interfacial shear strength (measured by the single-fiber fragmentation test) increased for both GO and rGO coated fibers. Unidirectional composites with a high content of both uncoated and coated fibers were produced and mechanically tested under various configurations (three-point bending, short beam shear and mode-I fracture toughness, creep). Composites with coated fibers performed similarly or better than composites prepared with uncoated fibers. Finally, composites with rGO coated fibers were tested for their piezoresistive response under both static and dynamic conditions. The electrical resistance changed proportionally to applied strain thus confirming the possibility of using composites with rGO coated fibers as strain sensors in load-bearing components.

经过精心设计的中间相可以改善环氧/玻璃复合材料的机械性能，同时引起压阻响应。为了证明这一概念，E-玻璃纤维通过电泳沉积涂覆了氧化石墨烯（GO），而随后的化学还原则得到了还原的氧化石墨烯（rGO）涂覆的纤维。GO和rGO涂层纤维的纤维-基质界面剪切强度（通过单纤维破碎测试测量）均增加。生产了具有高含量的未涂层纤维和涂层纤维的单向复合材料，并在各种配置（三点弯曲，短梁剪切和I型断裂韧性，蠕变）下进行了机械测试。具有涂覆纤维的复合材料的性能与未涂覆纤维的复合材料相似或更好。最后，测试了具有rGO涂层纤维的复合材料在静态和动态条件下的压阻响应。电阻与施加的应变成比例地变化，因此证实了将带有rGO涂层纤维的复合材料用作承重组件中的应变传感器的可能性。