Poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate): Correlation between colloidal particles and thin films

Yan, Hu; Arima, Susumu; Mori, Yasuyuki; Kagata, Tsubasa; Sato, Hiroshi; Okuzaki, Hidenori

doi:10.1016/j.tsf.2009.01.004

Cited by 58 publications

(53 citation statements)

References 17 publications

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“…80 mV regardless of the PSS composition ratio (α). This suggests that a negatively charged PSSrich layer covers on the surface of the colloidal gel particle, which is consistent with the results of XPS analysis [14]. Fig.5 Dependence of zeta potential of PEDOT/PSS colloidal gel particles on PSS composition ratio (α) measured by an electrophoretic light scattering technique.…”

Section: Dispersion Stabilitysupporting

confidence: 86%

Synthesis and Characterization of Highly Conductive PEDOT/PSS Colloidal Gels

Horii

Hikawa

Mochizuki

et al. 2012

Trans. Mat. Res. Soc. Japan

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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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Section: Dispersion Stabilitysupporting

confidence: 86%

Synthesis and Characterization of Highly Conductive PEDOT/PSS Colloidal Gels

Horii

Hikawa

Mochizuki

et al. 2012

Trans. Mat. Res. Soc. Japan

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“…It is found that the conductivity of the pristine, EG3, and EG20 films gradually increases from 8 K to 300 K, indicative of semiconducting characteristics in the experimental temperature range. According to a nearest-neighbor hopping model, activation energy (E a ) for the pristine film was calculated to be 18 meV similar to that of microfibers [5], indicating the carrier transport properties is intrinsic to the pristine PEDOT/PSS regardless of the shape and size [23,24]. It is noted that the value of E a significantly decreased to 2.7 meV for the EG3 film.…”

Section: Carrier Transport Propertiesmentioning

confidence: 93%

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

Murakami

Mori

Okuzaki

2011

Trans. Mat. Res. Soc. Japan

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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.

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“…The value is much larger than that of the film prepared from pristine solution, 16 nm which is previously observed by us. 6 Concentration of the re-dispersed solution, 2 w% is higher than that of the pristine one, 1.6 w%. The higher concentration is considerable to result in aggregate-packed film with a larger thickness.…”

Section: Resultsmentioning

confidence: 90%

Highly Conductive and Transparent Poly(3,4-ethylenedioxythiophene)/Poly(4-styrenesulfonate) (PEDOT/PSS) Thin Films

Yan

Okuzaki

2009

Polym. J.

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We have investigated centrifuge effect on the poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (denote PEDOT/ PSS) films prepared by a spin-coating coupled with a solvent-treatment, by a dynamic light scattering, a scanning transmission electron microscopic, an atomic force microscopic, and ultraviolet-visible spectroscopic measurements, in terms of electrical conductivity and optical transmittance. As a result, we have successfully prepared highly conductive (443 S/cm) and transparent (89%) PEDOT/PSS thin films with thickness of 93 nm by the combination of three approaches, i.e., centrifuge, spin-coating and solvent-treatment.KEY WORDS: Conductive Polymer / PEDOT/PSS / Thin Film / Transparent Electrode / Colloidal Dispersion / Since the ''solubility'' was realized by using a water-soluble polyelectrolyte poly(4-styrenesulfonate) (PSS), 1 poly(3,4-ethylenedioxythiophene)/poly(4-styrene sulfonate) (PEDOT/PSS) has been extensively studied from viewpoints of academic and technologic aspects.2-5 The PEDOT/PSS has been a widely available conductive polymer since the colloidal dispersion of the PEDOT/PSS in water could easily provide films on various substrates by simple means such as solution casting and spincoating techniques.Recently we have reported correlation between sizes of colloidal particles and minimum thickness of spin-coated thin films of PEDOT/PSS studied by a dynamic light scattering (DLS), a scanning transmission electron microscopy coupled with an energy dispersive X-ray spectroscopy (STEM-EDX), C 60 -sputtering X-ray photoelectron spectroscopy (XPS), and an atomic force microscopy (AFM).6 As a result, PEDOT/PSS thin films spin-coated at 3000 rpm, are suggested to be primary nanoparticle-''monolayer''s, based on the results of STEM-EDX, DLS, and XPS measurements. The AFM and conductive-probe microscopic images revealed that the PEDOT/PSS primary nanoparticles do not packed compactly within the thin films. Such thin films showed high transparency but poor conductivity.Principally PSS-layer-removed PEDOT/PSS nanoparticles with narrow size distributions would result in compactly packed nanoparticle-thin films which can be expected to show both high conductivity and transparency.Herein we present significant enhancement on electrical conductivity of spin-coated PEDOT-PSS thin films by centrifuge and solvent effects, while high transparency maintained. The PEDOT/PSS thin film with 93-nm thickness showed electrical conductivity of 443 S/cm and visible lighttransmittance of 89%. EXPERIMENTAL 20 mL of PEDOT/PSS (BAYTRON PH500) solution was separated by a centrifuge at 4000-5000 rpm and the upper layer of the solution was decanted. The upper layered solution was freeze-dried to obtain PEDOT/ PSS powder. The powder was re-dispersed in deionized water under ultrasonication, resulting in PEDOT/PSS solution with a concentration of 2 wt %. 9 mL of the 2 wt % solution with or without ethyleneglycol (EG) was dropped on the silicon wafer. The spin-coatings were performed at rotation speed of 3000 rpm for 1 mi...

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Poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate): Correlation between colloidal particles and thin films

Cited by 58 publications

References 17 publications

Synthesis and Characterization of Highly Conductive PEDOT/PSS Colloidal Gels

Synthesis and Characterization of Highly Conductive PEDOT/PSS Colloidal Gels

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

Highly Conductive and Transparent Poly(3,4-ethylenedioxythiophene)/Poly(4-styrenesulfonate) (PEDOT/PSS) Thin Films

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