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Illustration of carbon segregation at metal surface.
TEM images of graphene. (a) Low magnification image with step shaped edges, highlighted by red dash lines. Inset shows the SAED pattern of the graphene film. (b) HRTEM image of wrinkles in the graphene film, apparently of 3–4 layers.
Raman spectra of segregated carbon at Ni surface with different cooling rates.
Raman spectra of graphene before and after transferring from Ni to glass.
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