Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is the most successful,water-soluble,electrically conducting polymer(ECP) worldwide.It owes its success to large-scale production and its commercial application.1,2 It is a promising candidate for applications for various coatings,thermoelectric materials,conducting layers in capacitors,transparent conducting layers in organic light-emitting diodes,and photovoltaic devices because of its good performance.It is also a highly promising candidate for use in next-generation,novel,flexible electrodes,which can replace traditional electrodes such as carbon electrode,noble-metal electrode,and indium tin oxide electrode.However,conducting PEDOT:PSS film obtained by casting its aqueous dispersion easily swells,disintegrates,and peels off from the surface of the substrate electrode after immersion of the film electrode in aqueous solution.Fortunately,PEDOT:PSS derivatives provide a novel and simple means to solve the aforementioned problems with PEDOT:PSS.3-6 Colloidal aqueous dispersions of PEDOT:PSS derivatives or analogs may be prepared by oxidative polymerization of the corresponding monomer in an aqueous solution of poly(styrenesulfonic acid) (PSSH).However,such derivatives and analogs have very low electrical conductivity.Direct chemical polymerization has led to progress in the preparation of copolymers from mixtures of EDOT and its derivatives or analogs.