Conductive polymer nanofiber composites (CPNCs) have promising applications in many fields. However, preparation of the CPNC with excellent mechanical and electrical properties is still challenging. Here, reduced graphene oxide (RGO) was assembled onto the nanofiber surface assisted by ultrasonication, obtaining a nanofiber composite with a polymer core–RGO shell structure. The interfacial collision between polymer and RGO would occur under ultrasonication, during which the flexible RGO was easily deformed or bent and finally formed the core–shell structure. The polymer nanofiber core endowed the composite flexibility, while the RGO shell formed a continuous network, decreasing significantly the electrical resistivity. The electrical conductivity of the RGO-based nanofiber composite was closely related to the solvent used to disperse the RGO and the ultrasonication time. RGO introduction enhanced the tensile strength, Young’s modulus, and elongation at break. The RGO tubes were harvested by thermal degradation of the polymer nanofiber core.

中文翻译：

---

具有核-壳结构的还原石墨烯修饰的聚合物纳米纤维复合材料的改进的电气和机械性能

导电聚合物纳米纤维复合材料（CPNC）在许多领域都具有广阔的应用前景。然而，制备具有优异的机械和电气性能的CPNC仍然具有挑战性。在这里，借助超声处理将还原的氧化石墨烯（RGO）组装到纳米纤维表面上，从而获得具有聚合物核-RGO壳结构的纳米纤维复合材料。聚合物和RGO之间的界面碰撞将在超声作用下发生，在此期间，柔性RGO容易变形或弯曲，最终形成核-壳结构。聚合物纳米纤维核赋予了复合材料柔韧性，而RGO壳形成了连续的网络，大大降低了电阻率。RGO基纳米纤维复合材料的电导率与用于分散RGO的溶剂和超声处理时间密切相关。RGO的引入提高了抗张强度，杨氏模量和断裂伸长率。通过聚合物纳米纤维芯的热降解来收集RGO管。