The deposition of graphene oxide (GO) onto carbon fibers (CF) surface to form a hierarchical reinforcement structure has been achieved via various bonding types: van der Waals forces, zwitterionic interactions and covalent bonds. The functional groups, surface elements, contents of introduced GO, surface structures, morphologies and wettability of GO-deposited CF were characterized by FT-IR, XPS, TGA, Raman, SEM and Dynamic contact angle meter, respectively. Covalently grafting GO onto CF (CF-c-GO) has been proved to be the most effective way to improve the interfacial properties. Compared with pristine CF, the flexural strength, interlaminar shear strength and interfacial shear strength of CF-c-GO composites were increased by 28.7%, 22.7% and 50.6%, respectively. The CF-GO hierarchical composites featured a stronger interfacial bonding as evidenced by the fracture surface analysis, which demonstrated the enhancement in interfacial properties of hierarchical thermoplastic composites.

石墨烯氧化物（GO）沉积在碳纤维（CF）表面上以形成分层的增强结构已通过多种键合类型实现：范德华力，两性离子相互作用和共价键。通过FT-IR，XPS，TGA，拉曼，SEM和动态接触角仪分别表征了GO沉积CF的官能团，表面元素，引入的GO含量，表面结构，形貌和润湿性。已经证明将GO共价接枝到CF（CF-c-GO）上是改善界面性能的最有效方法。与原始CF相比，CF-c-GO复合材料的弯曲强度，层间剪切强度和界面剪切强度分别提高了28.7％，22.7％和50.6％。