Figure 2

Chemical properties of Graphene oxide (GO), activated reduced GO (ArGO), and thermally treated ArGO (TArGO). (a) X-ray photoelectron spectroscopy survey scan of GO, ArGO, and TArGO. (b–d) XPS C 1 s spectra of GO, ArGO, and TArGO, respectively. (e) Raman spectra of graphite, GO, ArGO, and TArGO.