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XPS core level spectra of (a) and (b) of graphene treated with plasma. (c) Schematic of postulated nitrogenation on graphene. The inset in (a) is the XPS survey spectrum.
(a) Raman spectra of plasma-treated graphene on Ni. The spectra from the top to the bottom correspond to 0, 3, 6, and 9 min exposure. The peaks were scaled to have similar intensity. (b) and (c) show the evolution of peak upon plasma exposure for graphene with initial Fermi level lying in conduction band and valance band, respectively. The dashed lines indicate the peak position of pristine graphene.
Raman spectra of the same exfoliated graphene on Si substrate, with postannealing at indicated temperatures for 5 min.
[(a)–(c)] curves of the same exfoliated graphene at different doping states. Measurements were carried out at 10 K. The dashed lines indicate the gate voltage at the charge neutrality point. (d) Raman spectra correspond to the graphene at different doping states shown in [(a)–(c)].
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