Abstract
Various kinds of surfactant (anionic, cationic, and zwitterionic) have been incorporated during the polymerization step to investigate their effect on the properties of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) molecules. Emulsification and polymerization of PEDOT together with surfactants were applied simultaneously to promote spherical shape of PEDOT:PSS particles and to enhance their conductivity and thermal properties. Transmission electron microscopy revealed that spherical particles with good dispersion were achieved on addition of 0.5 wt.% cationic surfactants. Moreover, the highest conductivity of 0.65 S/cm was also obtained at this condition. The interaction between the surfactants and the PEDOT or PSS molecules during the polymerization step played a key role in enhancing the thermal stability of the PEDOT:PSS in different ways. The possible mechanisms of interaction between each kind of surfactant and the PEDOT:PSS molecules are described.
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