Mechanical transfer of synthesized graphene has attracted considerable attention owing to its widely applicable and substrate recyclable process. Particularly, the interfacial adhesion energy between graphene and the growth Cu substrate plays an important role in the mechanical transfer of graphene without compromising its quality and properties. However, the quantitative control of adhesion for the graphene–Cu interface has remained a challenge. Here, we introduce liquid-assisted adhesion control of the graphene–Cu interface for a damage-free mechanical transfer process. It is demonstrated using environmentally assisted fracture mechanics testing that the adhesion energy of the graphene–Cu interface can be controlled by separating the interface in liquid environments. Analysis of the wetting characteristics for each surface and the thermodynamic work of adhesion calculation reveal the mechanism of liquid-assisted adhesion control. Liquid-assisted adhesion control effectively reduces structural defects in the transferred graphene layers. Finally, the applicability of the adhesion-controlled graphene transfer method to flexible and stretchable electronics is investigated.

合成石墨烯的机械转移由于其广泛适用的和可循环使用的基材方法而引起了极大的关注。特别地，石墨烯与生长的Cu衬底之间的界面粘合能在不损害其质量和性能的情况下在石墨烯的机械转移中起重要作用。然而，对石墨烯-铜界面的粘附力的定量控制仍然是一个挑战。在这里，我们介绍了石墨烯-铜界面的液体辅助粘合控制，以实现无损伤的机械转移过程。使用环境辅助断裂力学测试表明，可以通过在液体环境中分离界面来控制石墨烯-Cu界面的粘合能。对每个表面的润湿特性的分析和粘附力计算的热力学功揭示了液体辅助粘附力控制的机理。液体辅助粘合控制可有效减少转移的石墨烯层中的结构缺陷。最后，研究了粘合控制的石墨烯转移方法在柔性和可拉伸电子器件中的适用性。