Various transfer methods of graphene. a, Schematic demonstration of Roll-to-Roll lamination transfer using a thermal release layer. Adapted with permission . b, Schematic and photography images of bubbling process. The PMMA/graphene/Pt was dipped into NaOH solution with a constant current supply. Reproduced with permission . Copyright 2012, Nature Publishing Group. c, “Clean-lifting transfer (CLT)” method, which uses electrostatic forces to transfer graphene. Adapted with permission . d, Aligned transfer for placing graphene and BN to a desired location. Reproduced with permission . Copyright 2010, Nature Publishing Group.