Poly(3

4-ethlenedioxythiophene)/lignosulfonic acid (PEDOT/LS) conductive compounds was synthesized chemically

using LS not only as a dispersant but also a dopant for PEDOT.The structure and performance were investigated by ultraviolet-visible spectroscopy (UV-Vis)

Fourier transform infrared spectroscopy (FTIR)

zeta potential and particle size analysis

the atomic force microscopy (AFM)

X-ray photoelectron spectroscopy (XPS)

X-ray diffraction (XRD)

four point probes meter

electrophoresis and surface resistivity tests.It showed that PEDOT was successfully polymerized in LS aqueous solution

resulting in water-dispersive PEDOT/LS conductive particles.For the structure of PEDOT/LS particles

the stoichiometric PEDOT/LS complex stays in the inner core and the excess of hydrophilic LS covered on the surface.The interaction between PEDOT and LS is so strong that they can not be separated under electrophoresis.This complex is amorphous according to XRD.When the weight ratio of LS to EDOT increased from 0.7:1 to 3.0:1

the particle size dropped from 673 nm to 348 nm

and the surface resistivity of PEDOT/LS rose to 87.2 k/sq from 1.9 k/sq.Also

the PEDOT /LS film became smoother.The coating made by PEDOT/LS could make the surface resistance of a sheet glass decreased to 107 /sq from 1012 /sq.