(a) From top to bottom: graphene on nickel, gold intercalated between the graphene/Ni interface, and hydrogenated graphene on gold. The hydrogen atoms are marked in violet. C1 and C2-C3 indicate chemical environments for graphene/gold and hydrogenated graphene, respectively. (b) ARPES spectrum of graphene/Au along with a 3NN TB calculation and (c) the raw photoemission data. (d) ARPES spectra around the K point of hydrogenated graphene with increasing H-coverages as denoted. The last image (bottom right) corresponds to graphene after thermal annealing.
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