Breaking The Rate-Integrity Dilemma In Large-Area Bubbling Transfer Of Graphene By Strain Engineering

Efficient electrochemical bubbling delamination is highly promising for realizing the scalable transfer of high-quality chemical vapor deposition (CVD) graphene film. However, it remains a challenge to significantly improve the low delamination rate of large-area graphene without causing structural damage. Here, a strain-engineering strategy is reported to break this rate-integrity dilemma by introducing appreciable compressive strain into graphene to dramatically accelerate the delamination of CVD graphene from Cu foil in a non-destructive manner. An astonishing 25-fold improvement in the delamination rate is achieved by hot bubbling graphene coated with a post-cured UV-epoxy adhesive. Meanwhile, the inherent structural integrity of delaminated graphene films is well preserved. The strategy is superior to the prevalent methods by simultaneously realizing the unprecedented high-rate delamination and intact transfer. It is further demonstrated that it allows the highly efficient roll-to-roll bubbling transfer of meter-scale high-quality graphene films.