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. 2016 Nov 10;7:13261. doi: 10.1038/ncomms13261

Figure 1. Evolution of the electronic band structure of hydrogenated monolayer graphene (H-Gr) at 300 K.

Figure 1

(a) PES and NEXAFS spectra of graphene and H-Gr. Red, blue and green arrows indicate the valence-band maximum of as-prepared graphene, H-Gr (η=12%) and H-Gr (η=25%), respectively. Black arrow means the shift of the conduction band of both H-Gr (η=12%) and H-Gr (η=25%). The band gap was tunable up to 3.9 eV by the change of hydrogen coverage η. (b) Recovery of the π orbital of graphene in PES spectra after annealing of H-Gr in vacuum at 550 K for 2 h.