XPS was performed to confirm the presence of pristine graphene and provide further evidence of the PEDOT's interaction with graphene. These spectra are shown in Figure . XPS confirmed the integrity of the graphene during the exfoliation process, as evidenced by the low amount of oxygen functionality in the XPS spectra shown in Figure . The XPS spectra in Figure show that doping was successful, as evidenced by the increased oxidation state of PEDOT. Quantifying the optical transmittance of the composite films was performed using UV-Vis spectroscopy with a PEDOT-graphene film and a graphene-only control. The transparencies of graphene and PEDOT-graphene were approximately the same, at 76% and 75%, respectively, over the visible range, as shown in Figure . These films can be used in applications in which transparency is essential.