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【正文】 ron microscope (SEM) image of the coalescence of different graphene grains: (a) two。 (b) three。 (c) many。 (d) continuous graphene film formed from grains. The graphene film pletely covers the Pt substrates without any gaps. (e) Optical image of two coalesced graphene grains. (f) Raman mapping of the intensity of D band (1,300–1,400 cm ? 1) at the joint area of the two coalesced grains indicated by a red box in (e). The strong intensities along the line in the mapping indicate a grain boundary. The scale bars in (a–d) are 400 181。m, in (e) 50 181。m, and in (f) 20 181。m. Figure 3 | Illustration of the bubbling transfer process of graphene from a Pt substrate. (a) A Pt foil with grown graphene covered by a PMMA layer. (b) The PMMA/graphene/Pt in (a) was used as a cathode, and a Pt foil was used as an anode. (c) The PMMA/graphene was gradually separated from the Pt substrate driven by the H2 bubbles produced at the cathode after applying a constant current. (d) The pletely separated PMMA/graphene layer and Pt foil after bubbling for tens of seconds. The PMMA/graphene layer is indicated by a red arrow in (c) and (d)
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