摘要
石墨烯纤维是石墨烯纳米片层优异的性能应用到先进功能材料中的理想桥梁,尤其是在柔性储能材料和智能电子器件领域。传统的氧化石墨烯纤维由于其纳米片之间的相互作用很弱,导致力学强度相对较低。在我们的工作中,受天然鲍鱼壳丰富界面相互作用的启发,我们在界面中引入两种相互作用~[1]:钙离子和有机长链分子(PCDO)~[2]。离子键和共价键的协同作用使得氧化石墨烯纳米片之间的相互作用增强,从而使得石墨烯纤维的力学性能得到大幅度的提高。所得到的石墨烯纤维的力学拉伸强度和韧性分别为842.6 MPa和-15.8 MJ m~3,力学拉伸性能优于其他石墨烯纤维材料,可以任意打结;而且石墨烯纤维的导电性高达292.4S cm~(-1)。这种仿生协同增强的机理也为将来制备更高性能的多功能石墨烯纤维材料带来了新的思路。
Graphene-based fibers(GBFs) are an ideal bridge for integrating the extraordinary properties of individual graphene nanosheets into advanced, macroscopic, and functional materials for practical applications, especially in flexible energy-storage and intelligent devices. In our work, inspired by the interface interactions of natural nacre, we demonstrate ultrastrong GBFs by constructing synergistic interface interactions of ionic bonding with Ca~(2+), and covalent bonding with 10,12-pentacosadiyn-1-ol(PCDO). The tensile strength and toughness of bioinspired GBFs--reach as high as 842.6 MPa and 15.8 MJ m~3, respectively, and the electrical conductivity as high as 292.4 S cm~(-1). This bioinspired synergistic toughening strategy also provides a new insight for constructing integrated highperformance GBFs in the near future.
引文
[1]Y.Zhang,Y.Li,P.Ming,Q.Zhang,T.Liu,L.Jiang,Q.Cheng,Adv.Mater.2016.28,2834-2839.
[2]Q.Cheng,M.Wu,M.Li,L.Jiang,Z.Tang,Angew.Chem.,Int.Ed.2013,52,3750-3755.
