Synthesis and Characterization of Highly Conductive PEDOT/PSS Colloidal Gels

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.

Computational microscopy study of the granular structure and pH dependence of PEDOT:PSS

“…The experimental techniques include electron microscopy such as high-resolution transmission electron microscopy (HR-TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM); [13][14][15] diffraction scattering such as grazing incidence wide-angle X-ray scattering (GIWAXS) and grazing-incidence small-angle X-ray scattering (GISAXS); [16][17][18] and photo-electron spectroscopy such as X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). 19,20 The morphology and electrical conductivity of PEDOT: PSS are strongly dependent on the fabrication process, pH, [21][22][23][24][25] PSS composition ratio, 26 and additive concentration. [26][27][28] In its pristine (as polymerized) form, the electrical conductivity of PEDOT: PSS is rather low B1 S cm À1 , 12 which is attributed to the formation of an insulating layer of PSS around conducting PEDOT cores.…”

Acidity Suppression of Hole Transport Layer via Solution Reaction of Neutral PEDOT:PSS for Stable Perovskite Photovoltaics

“…An increase in the particle size with decreased particle boundaries leads to The PEDOT:PSS consists of gel-like particles containing a PSSshell which stabilizes PEDOT-rich particles in an aqueous solvent [42]. The size of the colloidal PEDOT:PSS gel particle in water is related to the ratio of PEDOT to PSS, as increasing particle size increases the particle boundary surface [33,35,43], see Figure 1b. An increase in the particle size with decreased particle boundaries leads to a few energy barriers which enhance the conductivity of PEDOT:PSS [44,45].…”

Fabrication of flexible transparent electrodes using PEDOT:PSS and application to resistive touch screen panels

“…The PEDOT:PSS water dispersion (1 wt %) was synthesized in our laboratory by oxidative polymerization of EDOT monomer in the presence of PSS where the composition ratio between the PEDOT and PSS was 1:2.5 . However, the PEDOT:PSS water dispersion is hard to spread uniformly on a hydrophobic plastic substrate and electrical conductivity of the pristine film is about 1 S/cm .…”