Enhancement of thermoelectric performance of PEDOT:PSS films by post-treatment with a superacid

Wang, Xizu; Kyaw, Aung Ko Ko; Yin, Chunrong; Wang, Fei; Zhu, Qiang; Tang, Tao; Yee, Phang In

doi:10.1039/c8ra02058b

Cited by 129 publications

(102 citation statements)

References 45 publications

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“…Moreover, the thermal properties of PEDOT:PSS films were investigated and the ρ, b, Cp, and κ of the pristine and BMIM-TFSI-SFS-F-PEDOT:PSS films are measured ( Table 3). The κ of the pristine PEDOT:PSS film was in accordance with those reported by independent groups (Lee et al, 2014a;Wang et al, 2015Wang et al, , 2018. The pulsed light heating thermoreflectance method was used to determine b at room temperature (Baba et al, 2011;Kyaw et al, 2018).…”

Section: Codesupporting

confidence: 65%

“…b (J/S 0.5 m 2 ) Cp (J/gK) ρm (g/cm 3 ) κ (W/m) attributable to the improvement of the number of ordered aggregates associated with interchain π-π stacking between the PEDOT chain and the enhancement of the crystallinity of the PEDOT:PSS film. Therefore, the XRD results displayed that compared to the pristine films, IL dedoped PEDOT:PSS films showed an enhanced interchain coupling of PEDOT:PSS with a more densely packed PEDOT and lamella stacking between two assemblies, resulting in an improved S of the films through interface scattering (Kim et al, 2014;Wang et al, 2018). Moreover, the thermal properties of PEDOT:PSS films were investigated and the ρ, b, Cp, and κ of the pristine and BMIM-TFSI-SFS-F-PEDOT:PSS films are measured ( Table 3).…”

Section: Codementioning

confidence: 99%

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Improved Thermoelectric Properties and Environmental Stability of Conducting PEDOT:PSS Films Post-treated With Imidazolium Ionic Liquids

et al. 2020

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Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is one of the most popular conducting polymers and widely used as polymer thermoelectric materials, and its thermoelectric performance could be improved by a variety of post-treatment processes. This paper reported two series of post-treatment methods to enhance the thermoelectric performance. The first series method included pre-treatment of PEDOT:PSS film with formamide, followed by imidazolium-based ionic liquids. The second series method included pre-treatment of PEDOT:PSS film with formamide, followed by sodium formaldehyde sulfoxylate, and finally imidazolium-based ionic liquids. Two series of post-treatment methods significantly improved the power factor of PEDOT:PSS when compared to that of PEDOT:PSS treated with formamide only. For example, using the first series post-treatment method with 40 vol.% ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl) amide, the Seebeck coefficient of the PEDOT:PSS film increased from 14.9 to 28.5 µV/K although the electrical conductivity reduced from 2,873 to 1,701 S/cm, resulting in a substantial improvement in the overall power factor from 63.6 to 137.8 µW/K 2 m. The electrical conductivity enhancement in the formamide-treatment process was in part ascribed to the removal of the insulating PSS component. Further treatment of PEDOT:PSS film with ionic liquid caused dedoping of PEDOT and hence increased in Seebeck coefficient. In contrast, second series posttreatment method led to the reduction in electrical conductivity from 2,873 to 641 S/cm but a big improvement in the Seebeck coefficient from 14.9 to 61.1 µV/K and thus the overall power factor reached up to ∼239.2 µW/K 2 m. Apart from the improvement in electrical conductivity, the increase in Seebeck coefficient is on account of the substantial dedoping of PEDOT polymer to its neutral form and thus leads to the big improvement of its Seebeck coefficient. The environmental stability of ionic liquid-treated PEDOT:PSS films were examined. It was found that the ionic liquid treated PEDOT:PSS retained Yemata et al. Improved Thermoelectric Properties of PEDOT:PSS more than 70% Seebeck coefficient and electrical conductivity at 75% RH humidity and 70 • C for 480 h. The improved long-term TE stability is attributed to the strong ionic interaction between sulfonate anions and bulky imidazolium cations that effectively block the penetration of water and lessen the tendency to take up water from the air.

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Section: Codesupporting

confidence: 65%

Section: Codementioning

confidence: 99%

Improved Thermoelectric Properties and Environmental Stability of Conducting PEDOT:PSS Films Post-treated With Imidazolium Ionic Liquids

et al. 2020

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“…Studies showed that the s of PEDOT:PSS lms could be greatly enhanced with various post-treatment methods. [15][16][17][18][19][20][21][22][23] These post treatments enlarge the charge carrier concentration, and bipolaron are the main charge carriers. However, this high doping level results in a small S of PEDOT:PSS because of the extra charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Modulation of the doping level of PEDOT:PSS film by treatment with hydrazine to improve the Seebeck coefficient

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“…Some of the π-conjugated polymers successfully employed are based on polyaniline, polypyrrole and poly(3,4-ethylenedioxythiophene) (PEDOT). Many studies have aimed to enhance the properties such as the electronic conductivity, by adding high boiling point solvents [ 9 ], superacids [ 10 ] or ionic liquids [ 11 ], mechanical properties [ 12 ] or employing hybrid architectures [ 13 ], even showing metallic conductivities of 6259 ± 1468 S cm −1 for thin post-treated films [ 14 ] and totally flexible foils [ 12 ]. These π-conjugated polymers can be either functionalized with polyelectrolytes and polymer electrolytes via pendant groups [ 15 ], or form copolymers and blends with other polymers (e.g., polyethylene oxide (PEO) [ 4 ] and polystyrene sulfonate (PSS) [ 12 ]), which provide the ionic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Mixed Ionic-Electronic Conductors Based on PEDOT:PolyDADMA and Organic Ionic Plastic Crystals

et al. 2020

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Mixed ionic-electronic conductors, such as poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) are postulated to be the next generation materials in energy storage and electronic devices. Although many studies have aimed to enhance the electronic conductivity and mechanical properties of these materials, there has been little focus on ionic conductivity. In this work, blends based on PEDOT stabilized by the polyelectrolyte poly(diallyldimethylammonium) (PolyDADMA X) are reported, where the X anion is either chloride (Cl), bis(fluorosulfonyl)imide (FSI), bis(trifluoromethylsulfonyl)imide (TFSI), triflate (CF3SO3) or tosylate (Tos). Electronic conductivity values of 0.6 S cm−1 were achieved in films of PEDOT:PolyDADMA FSI (without any post-treatment), with an ionic conductivity of 5 × 10−6 S cm−1 at 70 °C. Organic ionic plastic crystals (OIPCs) based on the cation N-ethyl-N-methylpyrrolidinium (C2mpyr+) with similar anions were added to synergistically enhance both electronic and ionic conductivities. PEDOT:PolyDADMA X / [C2mpyr][X] composites (80/20 wt%) resulted in higher ionic conductivity values (e.g., 2 × 10−5 S cm−1 at 70 °C for PEDOT:PolyDADMA FSI/[C2mpyr][FSI]) and improved electrochemical performance versus the neat PEDOT:PolyDADMA X with no OIPC. Herein, new materials are presented and discussed including new PEDOT:PolyDADMA and organic ionic plastic crystal blends highlighting their promising properties for energy storage applications.

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Enhancement of thermoelectric performance of PEDOT:PSS films by post-treatment with a superacid

Abstract: Treatment of PEDOT:PSS films with a superacid results in remarkable improvement of thermoelectric performance with a power factor of 142 μW m−1 K−2.

Cited by 129 publications

References 45 publications

Improved Thermoelectric Properties and Environmental Stability of Conducting PEDOT:PSS Films Post-treated With Imidazolium Ionic Liquids

Improved Thermoelectric Properties and Environmental Stability of Conducting PEDOT:PSS Films Post-treated With Imidazolium Ionic Liquids

Modulation of the doping level of PEDOT:PSS film by treatment with hydrazine to improve the Seebeck coefficient

Mixed Ionic-Electronic Conductors Based on PEDOT:PolyDADMA and Organic Ionic Plastic Crystals

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