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Optical images of an alumina supported membrane (h ≈ 100 nm) (a) with graphene/PMMA, (b) with graphene once PMMA is eliminated showing the wrinkles and bi/tri-layer graphene spots and (c) graphene edge (indicated by a blue arrow). (d) Raman spectra of graphene at different positions. Black curve corresponds to a graphene bilayer (darker spot in the images). The scale bar corresponds to 10 µm in all cases.
