title: Stable aqueous dispersion of reduced graphene nanosheets via non-covalent functionalization with conducting polymers and application in transparent electrodes.
abstract: We developed a simple and facile method of producing a stable aqueous suspension of reduced graphene oxide (RGO) nanosheets through the chemical reduction of graphene oxide in the presence of a conducting polymer dispersant, poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). This approach involves the cooperative interactions of strong π- π interactions between a two-dimensional graphene sheet and a rigid backbone of PEDOT and the intermolecular electrostatic repulsions between negatively charged PSS bound on the RGO sheets, which impart the colloidal stability of the resulting hybrid nanocomposite of RGO/PEDOT. Moreover, our one-step solution-based method allows preserving the intrinsic chemical and electronic properties of both components, yielding a hybrid film of RGO nanosheets of high conductivity of 2.3 kΩ/sq with a transmittance of 80%. By taking advantage of conducting network structure of conducting polymers which provides an additional flexibility and mechanical stability of RGO nanosheets, we demonstrate the potential application of hybrid RGO/PEDOT as highly flexible and transparent electrodes.
authors.affiliation: Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea.
authors.forename: Kiyoung
authors.initials: K
authors.lastname: Jo
authors.forename: Taemin
authors.initials: T
authors.lastname: Lee
authors.forename: Hyun Jung
authors.initials: HJ
authors.lastname: Choi
authors.forename: Ju Hyun
authors.initials: JH
authors.lastname: Park
authors.forename: Dong Jun
authors.initials: DJ
authors.lastname: Lee
authors.forename: Dong Wook
authors.initials: DW
authors.lastname: Lee
authors.forename: Byeong-Su
authors.initials: BS
authors.lastname: Kim