Stimuli-responsive fusion and fission are widely observed in both bio-organizations and artificial molecular assemblies. However, the design of a system with structure and property persistence during repeated fusion and fission remains challenging. We show reversible fusion and fission of wet-spun graphene oxide (GO) fibers, in which a number of macroscopic fibers can fuse into a thicker one and can also separate into original individual fibers under stimulation of solvents. The dynamic geometrical deformation of GO fiber shells, caused by solvent evaporation and infiltration, is the key to the reversible fusion-fission cycles. This principle is extended to implement flexible transitions between complex fiber assemblies and the inclusion or expulsion of guest compounds.

在生物组织和人工分子组装体中均广泛观察到刺激响应性融合和裂变。然而，在重复融合和裂变过程中具有结构和特性持久性的系统的设计仍然具有挑战性。我们显示了湿纺氧化石墨烯（GO）纤维的可逆融合和裂变，其中许多宏观纤维可以融合成一种较粗的纤维，也可以在溶剂的刺激下分离成原始的单个纤维。由溶剂蒸发和渗透引起的GO纤维壳的动态几何变形是可逆熔裂循环的关键。扩展该原理以实现复杂纤维组件之间的灵活过渡以及客体化合物的包含或排出。