Line patterning of conducting polymers: New horizons for inexpensive, disposable electronic devices

Poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) was synthesized by oxidative polymerization and pH dependence of structure and electrical conductivity of the cast films were investigated by means of UV-vis-NIR, XRD, AFM analyses, and four-point technique. It was found that the neutralization of PEDOT/PSS with NaOH decreased the absorption of bipolarons representing the PEDOT in the highly doped state and disrupted the π-π stacking of the PEDOT crystalline structure, which lowered the electrical conductivity by six orders of magnitude with increasing the pH from 1.7 to 13.

Section: Introductionmentioning

confidence: 99%

Effect of pH on Structure and Conductivity of PEDOT/PSS

Mochizuki

Horii

Okuzaki

2012

“…Poly (3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS), one of the most successful conducting polymers commercially available in the form of aqueous dispersion as colloidal particles, has superior mechanical properties, thermal stability, and high conductivity, which provides potential applications to electrical and optical devices such as transparent electrodes for touch panels and flexible displays [1,2], capacitors [3], microfibers [4][5][6], Shottky diodes [7], field-effect transistors [8][9][10], and actuators [11][12][13]. The resistance of the conductive polymer is, however, too high to fabricate a large-area electronic circuit due to the low electrical conductivity of the commercially available pristine PEDOT/PSS [4,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ethylene Glycol on Structure and Carrier Transport in Highly Conductive Poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate)

Murakami

Mori

Okuzaki

2011

Highly conductive films made of poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) were prepared by casting the PEDOT/PSS aqueous dispersion of colloidal particles containing ethylene glycol (EG). By addition of 3% of EG, the electrical conductivity was significantly increased from 3 to 430 S/cm. The EG was crucially important for (i) removal of the insulating PSS from the surface of the PEDOT/PSS particles, (ii) crystallization of PEDOT molecules, and (iii) aggregation of the particles, which improved both intra-and inter-particle transfer of charge carriers. A further increase of the EG concentration, however, decreased the conductivity, which was due to the morphological inhomogeneity by the phase segregation.

“…Therefore, the PEDOT/PSS colloidal gel particles can be shaped into various shapes such as thin coatings on various substrates [3,4], fibers [5,6], and freestanding thick films (quaternary structure) [7,8], which can be applied to printed organic electronics. Because of its high electrical conductivity, transparency, and thermal stability, the PEDOT/PSS has attracted considerable attention for transparent electrodes of flexible displays [9,10], touch panels [11,12], and solar cells [13] as an alternative of indium tin oxide (ITO) due to the drain problem of rare metals.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Highly Conductive PEDOT/PSS Colloidal Gels

Horii

Hikawa

Mochizuki

et al. 2012

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.