石墨烯纤维的湿法纺丝制备及其性能

Preparation of graphene fibers by wet spinning and fiber characterization

为制备兼具导电性和柔韧性的石墨烯纤维,首先采用改进的Hummers法制备氧化石墨烯,然后以氧化石墨烯溶液为纺丝液,CaCl2的乙醇溶液为凝固浴,通过湿法纺丝后经氢碘酸还原制备得到石墨烯纤维;并以羧甲基纤维素为交联剂对石墨烯纤维进行改性处理,得到交联石墨烯纤维。最后对2种石墨烯纤维的表面形态、导电性和力学性能进行测试与分析,并初步应用。结果表明:制备的氧化石墨烯含氧量为31.37%,单片层厚度为0.88 nm;2种石墨烯纤维表面均较光滑,交联石墨烯纤维内部片层排列更加紧密,其电导率达124 S/cm,与交联前的石墨烯纤维相差不大,但拉伸强度由交联前的120 MPa增加至179 MPa;单根交联石墨烯纤维作为电路导线可点亮灯泡,且可任意弯曲打结编织成花瓣及平纹网状结构。

In order to prepare graphene fiber with both conductivity and flexibility,the soluble graphene oxide was prepared through modified Hummers method.The graphene oxide solution was used as the spinning solution,and the CaCl2 ethanol solution as the coagulation bath.The graphene fiber was obtained by hydroiodic reduction via wet spinning.The fiber was treated with carboxymethylcellulose as cross-linking agent to obtain cross-linked graphene fiber for comparison.The surface morphology,electrical conductivity and mechanical properties of the two graphene fibers were characterized for preliminary applications.The results show that the prepared graphene oxide fiber has an oxygen content of 31.37%and a monolayer thickness of 0.88 nm.Besides,the surfaces of the two types of graphene fibers are smooth,but the inner layers of the cross-linked graphene fiber are arranged more closely with the conductivity of 124 S/cm,which is similar to the conductivity of the graphene fiber before crosslinking.However,the tensile strength is significantly increased from 120 MPa to 179 MPa after crosslinking.The single cross-linked graphene fiber can be used as a circuit wire to light the bulb,and can be arbitrarily bent and knotted to form a petal and a plain mesh structure.