Fabrication Process of Bilayer RGO/PEDOT:PSS Film for Flexible Transparent Conductive Electrode.

We developed a facile method to achieve a homogeneous coating of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) on a graphene oxide (GO) layer with outstanding sheet resistance. We fabricated a transparent bilayer GO/PEDOT:PSS film as a flexible transparent conductive electrode (TCF). GO layer was coated on flexible PET and PI substrate by dip coating. The coated GO layers were modulated by their sizes and post heat treatment. The GO layers were thermally reduced and over coated with a PEDOT:PSS layer. Compared to the values of PEDOT:PSS, the sheet resistance of the bilayer film decreased by 5.2% and cyclic bending durability increased by 47.4%. The synergetic conductive network between the reduced graphene oxide (RGO) layer and the PEDOT:PSS layer resulted in low sheet resistance; the initial network retained under cyclic bending. The bilayer TCF film can be applied to multifunctional electrical devices for which flexibility and high conductivity are necessary.