Synthesis and Characterization of Highly Conductive PEDOT/PSS Colloidal Gels

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Abstract

Poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) with various PSS composition ratios (α) was synthesized by oxidative polymerization and particle size distribution and zeta potential of the resulting colloidal gel particles were investigated by means of a dynamic light scattering technique. It was found that mean volume diameter of the PEDOT/PSS colloidal gel particles were 400-600 nm at α = 1～6, which drastically decreased to ～10 nm at α = 8～15. On the other hand, zeta potential was about -80 mV regardless of the composition ratio. The electrical conductivity of the PEDOT/PSS cast film measured by a four-point method attained as high as 263 S/cm at α = 3.

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