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X-ray photoelectron spectroscopy (XPS) analysis of: (A) Survey spectra of graphene oxide (GO), fluorine-doped graphene oxide (F-GO), nitrogen-doped partially reduced graphene oxide (N-rGO), thermally reduced graphene oxide (TrGO), and boron-doped partially reduced graphene oxide (B-rGO). High-resolution C1s spectra with the deconvoluted peaks for (B) GO and (C) TrGO.
