Chemical vapor deposition–grown nominally bilayer graphene (Trivial Transfer Graphene) was purchased from ACS Material. The graphene films were delivered on a substrate and covered by a poly(methyl methacrylate) (PMMA) transfer layer. The graphene film was floated on deionized (DI) water, fished onto a piece of filter paper, and cut in rectangles with a size of approximately 2 mm × 2 mm. The rectangular pieces were then floated on DI water and picked up with Quantifoil TEM support films. To dissolve the PMMA layer, the TEM grid was immersed in acetone for 20 s and put into a saturated acetone vapor atmosphere under reflux for 2 hours afterward.

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