Magnetoresistance and thermoelectric power studies of metal-nonmetal transition in iodine-doped polyacetylene

Kaneko, Hiroshi; Ishiguro, Takehiko; Takahashi, Akio; Tanida, Jun

doi:10.1016/0379-6779(93)90836-l

Cited by 45 publications

(37 citation statements)

References 10 publications

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“…Currently, dipping polymers into dopant solutions or exposing polymers to a dopant vapor/atmosphere are the two most prevalent methods to perform p‐ and n‐type chemical doping. For p‐type doping, common dopants include I 2 , FeCl 3 , and the ferric salt of triflimide (Fetf) . For n‐type doping, common dopants include tetrakis(dimethylamino)ethylene (TDAE), hydrazine, and polyethylenimine (PEI) .…”

Section: Strategies To Optimize the Properties Of Conductive Polymersmentioning

confidence: 99%

“…a) Mechanism of redox‐based doping through chemical reactions. b) Molecular structures of common n‐type dopants tetrakis(dimethylamino)ethylene (TDAE), hydrazine, and polyethylenimine (PEI); p‐type dopants including I 2 , FeCl 3 , and the ferric salt of triflimide (Fetf) . c) Electrical conductivity (σ), Seebeck coefficient ( S ), and power factor ( S 2 σ) of TDAE‐doped PEDOT:Tos, where a promising zT peak of 0.25 is achieved.…”

Section: Strategies To Optimize the Properties Of Conductive Polymersmentioning

confidence: 99%

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Flexible Thermoelectric Materials and Generators: Challenges and Innovations

et al. 2019

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The urgent need for ecofriendly, stable, long‐lifetime power sources is driving the booming market for miniaturized and integrated electronics, including wearable and medical implantable devices. Flexible thermoelectric materials and devices are receiving increasing attention, due to their capability to convert heat into electricity directly by conformably attaching them onto heat sources. Polymer‐based flexible thermoelectric materials are particularly fascinating because of their intrinsic flexibility, affordability, and low toxicity. There are other promising alternatives including inorganic‐based flexible thermoelectrics that have high energy‐conversion efficiency, large power output, and stability at relatively high temperature. Herein, the state‐of‐the‐art in the development of flexible thermoelectric materials and devices is summarized, including exploring the fundamentals behind the performance of flexible thermoelectric materials and devices by relating materials chemistry and physics to properties. By taking insights from carrier and phonon transport, the limitations of high‐performance flexible thermoelectric materials and the underlying mechanisms associated with each optimization strategy are highlighted. Finally, the remaining challenges in flexible thermoelectric materials are discussed in conclusion, and suggestions and a framework to guide future development are provided, which may pave the way for a bright future for flexible thermoelectric devices in the energy market.

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Section: Strategies To Optimize the Properties Of Conductive Polymersmentioning

confidence: 99%

Section: Strategies To Optimize the Properties Of Conductive Polymersmentioning

confidence: 99%

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

et al. 2019

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“…[7][8][9][10] The intrinsically low thermal conductivity of organic materials which is about 2 to 3 orders of magnitude lower than those of the inorganics make them potential candidates for high-performance TE applications. Polymeric TE materials investigated include poly(thienothiophene), 11 polyaniline, 12 poly(3,4-ethylenedioxythiophene) (PEDOT), 13 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 polyacetylene, 14 and poly(3-hexylthiophene). 15 These treatment chemicals used to enhance the conductivity are generally called secondary dopants which are apparently "inert" substances which induce further conductivity enhancement and other property changes.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermoelectric Performance of PEDOT:PSS Flexible Bulky Papers by Treatment with Secondary Dopants

Mengistie

Chen²,

Boopathi

et al. 2014

ACS Appl. Mater. Interfaces

208

145

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For inorganic thermoelectric materials, Seebeck coefficient and electrical conductivity are interdependent, and hence optimization of thermoelectric performance is challenging. In this work we show that thermoelectric performance of PEDOT:PSS can be enhanced by greatly improving its electrical conductivity in contrast to inorganic thermoelectric materials. Free-standing flexible and smooth PEDOT:PSS bulky papers were prepared using vacuum-assisted filtration. The electrical conductivity was enhanced to 640, 800, 1300, and 1900 S cm(-1) by treating PEDOT:PSS with ethylene glycol, polyethylene glycol, methanol, and formic acid, respectively. The Seebeck coefficient did not show significant variation with the tremendous conductivity enhancement being 21.4 and 20.6 μV K(-1) for ethylene glycol- and formic acid-treated papers, respectively. This is because secondary dopants, which increase electrical conductivity, do not change oxidation level of PEDOT. A maximum power factor of 80.6 μW m(-1) K(-2) was shown for formic acid-treated samples, while it was only 29.3 μW m(-1) K(-2) for ethylene glycol treatment. Coupled with intrinsically low thermal conductivity of PEDOT:PSS, ZT ≈ 0.32 was measured at room temperature using Harman method. We investigated the reasons behind the greatly enhanced thermoelectric performance.

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“…In addition, the p-p stacking interaction between graphene and the backbone of PEDOT:PSS results in a exible lm with enhanced electrical and thermoelectric properties, and an excellent bending stability, in comparison with untreated graphene lm. 3 , 97%], 3,4-ethylenedioxythiphene (EDOT), poly (sodium 4-styrenesulfonate) (PSS), and isopropyl alcohol (IPA), dimethyl sulfoxide (DMSO), the cation exchange resin, and anion exchange resin were purchased from Sigma Aldrich Co., Yongin-Si, Gyeonggi-do, Korea. The RTCVD graphene 22 was provided by HAESUNGDS Co., LTD, and the graphene lms were transferred onto a PET substrate.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8][9] The PEDOT:PSS has attracted signicant attention due to its excellent electrical conductivity, optical properties, and water solubility. Furthermore, when it is treated with some organic solvents such as dimethyl sulfoxide (DMSO), or ethylene glycol (EG), its electrical conductivity dramatically increases due to a conformational change in the PEDOT chains.…”

Section: Introductionmentioning

confidence: 99%

Large-scalable RTCVD Graphene/PEDOT:PSS hybrid conductive film for application in transparent and flexible thermoelectric nanogenerators

Park

Yoo

et al. 2017

RSC Adv.

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Poly(3,4-ethyldioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), as an thermoelectric(TE) material, exhibits a high electrical conductivity and ZT value (10 À1 -10 0 ). Nevertheless, a low thermovoltage of the organic thermoelectric materials must be overcome, in comparison to that of semi metals. Recently, to address these challenges, several researchers have investigated PEDOT:PSS/carbon material composites.Herein, a transparent and flexible hybrid film made up of rapid thermal chemical vapor deposition (RTCVD) graphene and PEDOT:PSS results in enhanced TE performance. The PEDOT:PSS was synthesized by oxidative polymerization, and the hybrid process of the graphene film and PEDOT:PSS film was conducted using the layer-by-layer method. The results of AFM and Raman spectroscopy revealed that the synergistic effect through composite films improved the electrical properties. The maximum electrical conductivity and power factor of the RTCVD graphene/PEDOT:PSS (RCG/P) hybrid film were 1096 S cm À1 and 57.9 mW m À1 K À2, respectively. In addition, the RCG/P hybrid film exhibited excellent mechanical flexibility and stability.

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Magnetoresistance and thermoelectric power studies of metal-nonmetal transition in iodine-doped polyacetylene

Cited by 45 publications

References 10 publications

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

Enhanced Thermoelectric Performance of PEDOT:PSS Flexible Bulky Papers by Treatment with Secondary Dopants

Large-scalable RTCVD Graphene/PEDOT:PSS hybrid conductive film for application in transparent and flexible thermoelectric nanogenerators

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