First, the graphene film was coated with Fe(OTs)3 via spin coating, which was found to be a superior coating method compared to dip coating. This method required heating during drying to prevent the Fe(OTs)3 from crystallizing, 40 as no polymerization was observed if this redox reagent was allowed to crystallize. Additionally, we found the conductivity was extremely low if the reaction was performed in an arid environment. Therefore, all reactions were conducted in a humidity-controlled environment, achieved by placing a water-saturated solution of MgCl2 in the chamber during the polymerization. This maintained a relative humidity of approximately 36% throughout the polymerization process. A successful polymerization was indicated by the film becoming a light blue color. XRD, presented in Figure , was utilized to evaluate the orientation and crystallinity of the PEDOT on the graphene film. The XRD spectrum of a film containing just PEDOT is shown in Figure . Notably, the characteristic peaks of PEDOT and graphene coincided, indicating that the PEDOT interlayer spacing closely matched the graphene. The spacing was approximately 3.5 Å, indicating lamellar or face-on-stacking of the PEDOT chains; this was the expected result. Also shown in Figure and Figure are the XRD spectra illustrating the effect of sulfuric acid on the PEDOT and PEDOT -graphene film. Sulfuric acid is often used to enhance the conductivity of conductive films. Unfortunately, in our system, the conductivity consistently decreased with the addition of H2SO4. A possible explanation for this decrease in conductivity is our observation that the PEDOT underwent a structural change when doped with an acid, delaminating from the graphene surface. This delamination phenomenon may explain why post-treatment of the films permanently lowered their conductivity.