Core-shell composite latexes derived from PEDOT:PSS dispersion and the preparation of conductive, flexible and transparent films

In this study, a highly conductive poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) (PEDOT:PSS) dispersion served as a stabilizer for producing conductive PEDOT:PSS-poly(styrene-co-butyl acrylate) (PEDOT:PSS-P(St-BA)) composite latexes by emulsion polymerization. Furthermore, soft latex particles of poly(styrene-co-butyl acrylate), P(St-BA), were synthesized via emulsion polymerization and then mixed with the conductive PEDOT:PSS-P(St-BA), followed by casting on the substrate. After drying, conductive composite films with flexibility and transparency could be obtained. The particle size and morphology of PEDOT:PSS-P(St-BA) were observed by a scanning electron microscope. The film surface resistance, thickness, conductivity and transmittance of the composite films were measured and studied. Bending tests were also conducted to detect the flexibility. According to the results, the composite films showed high transmittance while possessing good conductivity and superior flexibility. The method may serve as a practical approach to fabricate conductive, flexible and transparent films.