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(a) Scheme of the fabrication process for layer-structured Al/Gr composites. (b) SEM image of the surface morphology of the graphene-coated Al foil. (c) Raman spectra of the graphene powder sprayed on the Si substrate. (d) SEM images of the cross section of Al/Gr layered composites. (e) Raman spectra of the graphene-coated Al foil after acid treatment.
