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Ultraviolet/visible (UV/Vis) spectra of (a) graphene oxide (GO), polythiophene (PTH), polypyrrole (PPY), copolymer (COP); and (b) reduced graphene oxide/polythiophene (RGO/PTH), reduced graphene oxide/poly(pyrrol-co-thiophene) (RGO/COP), reduced graphene oxide/polypyrrole (RGO/PPY), reduced graphene oxide (RGO).
