Graphene fibers with excellent mechanical and electrical properties are in great demand in the field of modern wearable microelectronics. However, presently the strength and electrical conductivity of graphene fibers are difficult to meet the requirements, limiting their application in wearable sensors. Herein, a facile approach is proposed for fabricating Ag-doped reduced graphene oxide fiber (Ag-rGOF) via introduction of Ag ion (Ag⁺) into fluid graphene oxide fiber (GOF) in the coagulation bath during wet-spinning followed by chemical reduction. The addition of Ag⁺ is beneficial to fiber coagulation and improves not only conductivity of the fiber, but also its mechanical properties. The tensile strength reaches up to 334 MPa and the conductivity to 1.14 × 10⁴ S/m, about 4 times as high as that of reduced graphene oxide fiber (rGOF). The fibrous strain sensor based on Ag-rGOF prepared with thermoplastic polyurethane as support shows high gauge factor of 177 at over 20% strain, rapid response time of 55 ms, and outstanding durability after 1000 stretch/release cycles. We also demonstrate that the fibrous sensors can be attached on skin to monitor sensitively facial expression and human motions.

在现代可穿戴微电子领域中，对具有优异机械和电性能的石墨烯纤维的需求很大。但是，目前石墨烯纤维的强度和电导率难以满足要求，限制了它们在可穿戴传感器中的应用。在此，提出了一种在湿纺过程中通过将Ag离子（Ag ⁺）引入到凝固浴中的流体氧化石墨烯纤维（GOF）中来制造掺杂Ag的还原氧化石墨烯纤维（Ag-rGOF）的简便方法。 。Ag ⁺的添加有益于纤维凝结，不仅改善了纤维的导电性，而且还改善了其机械性能。抗拉强度达到334 MPa，电导率达到1.14×10 ⁴S / m，约为还原型氧化石墨纤维（rGOF）的4倍。基于以热塑性聚氨酯为载体制备的Ag-rGOF的纤维应变传感器在超过20％的应变时显示出177的高规格系数，55 ms的快速响应时间以及1000次拉伸/释放循环后的出色耐用性。我们还证明了纤维传感器可以附着在皮肤上，以监测敏感的面部表情和人体运动。