Simultaneous improvement in electrical conductivity and Seebeck coefficient of PEDOT:PSS by N2 pressure-induced nitric acid treatment

May Thu Zar Myint; Masaki Hada; Hirotaka Inoue; Tatsuki Marui; Takeshi Nishikawa; Yuta Nishina; Susumu Ichimura; Masayoshi Umeno; Aung Ko Ko Kyaw; Yasuhiko Hayashi

doi:10.1039/c8ra06094k

Simultaneous improvement in electrical conductivity and Seebeck coefficient of PEDOT:PSS by N₂ pressure-induced nitric acid treatment

May Thu Zar Myint, Masaki Hada, Hirotaka Inoue, Tatsuki Marui, Takeshi Nishikawa, Yuta Nishina, Susumu Ichimura, Masayoshi Umeno, Aung Ko Ko Kyaw, Yasuhiko Hayashi

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

As a thermoelectric (TE) material suited to applications for recycling waste-heat into electricity through the Seebeck effect, poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid) (PEDOT:PSS) is of great interest. Our research demonstrates a comprehensive study of different post-treatment methods with nitric acid (HNO₃) to enhance the thermoelectric properties of PEDOT:PSS. The optimum conditions are obtained when PEDOT:PSS is treated with HNO₃ for 10 min at room temperature followed by passing nitrogen gas (N₂) with a pressure of 0.2 MPa. Upon this treatment, PEDOT:PSS changes from semiconductor-like behaviour to metal-like behaviour, with a simultaneous enhancement in the electrical conductivity and Seebeck coefficient at elevated temperature, resulting in an increase in the thermoelectric power factor from 0.0818 to 94.3 μW m⁻¹ K⁻² at 150 °C. The improvement in the TE properties is ascribed to the combined effects of phase segregation and conformational change of the PEDOT due to the weakened coulombic attraction between PEDOT and PSS chains by nitric acid as well as the pressure of the N₂ gas as a mechanical means.

Original language	English
Pages (from-to)	36563-36570
Number of pages	8
Journal	RSC Advances
Volume	8
Issue number	64
DOIs	https://doi.org/10.1039/c8ra06094k
Publication status	Published - 2018

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

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10.1039/c8ra06094k

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title = "Simultaneous improvement in electrical conductivity and Seebeck coefficient of PEDOT:PSS by N2 pressure-induced nitric acid treatment",

abstract = "As a thermoelectric (TE) material suited to applications for recycling waste-heat into electricity through the Seebeck effect, poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid) (PEDOT:PSS) is of great interest. Our research demonstrates a comprehensive study of different post-treatment methods with nitric acid (HNO3) to enhance the thermoelectric properties of PEDOT:PSS. The optimum conditions are obtained when PEDOT:PSS is treated with HNO3 for 10 min at room temperature followed by passing nitrogen gas (N2) with a pressure of 0.2 MPa. Upon this treatment, PEDOT:PSS changes from semiconductor-like behaviour to metal-like behaviour, with a simultaneous enhancement in the electrical conductivity and Seebeck coefficient at elevated temperature, resulting in an increase in the thermoelectric power factor from 0.0818 to 94.3 μW m−1 K−2 at 150 °C. The improvement in the TE properties is ascribed to the combined effects of phase segregation and conformational change of the PEDOT due to the weakened coulombic attraction between PEDOT and PSS chains by nitric acid as well as the pressure of the N2 gas as a mechanical means.",

author = "{Zar Myint}, {May Thu} and Masaki Hada and Hirotaka Inoue and Tatsuki Marui and Takeshi Nishikawa and Yuta Nishina and Susumu Ichimura and Masayoshi Umeno and {Ko Kyaw}, {Aung Ko} and Yasuhiko Hayashi",

note = "Funding Information: We would like to thank ADVANCE RIKO, Inc. (Kanagawa, Japan) for comprehensive help of thermoelectric evaluation. This study was partially supported by the JSPS KAKENHI (Grant Number 17K20065). AKKK would like to thank start-up fund from Thousand Young Talents Program of China and Shenzhen Peacock Team Project (No. KQTD2016030111203005). Publisher Copyright: {\textcopyright} The Royal Society of Chemistry.",

year = "2018",

doi = "10.1039/c8ra06094k",

language = "English",

volume = "8",

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publisher = "Royal Society of Chemistry",

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T1 - Simultaneous improvement in electrical conductivity and Seebeck coefficient of PEDOT:PSS by N2 pressure-induced nitric acid treatment

AU - Zar Myint, May Thu

AU - Hada, Masaki

AU - Inoue, Hirotaka

AU - Marui, Tatsuki

AU - Nishikawa, Takeshi

AU - Nishina, Yuta

AU - Ichimura, Susumu

AU - Umeno, Masayoshi

AU - Ko Kyaw, Aung Ko

AU - Hayashi, Yasuhiko

N1 - Funding Information: We would like to thank ADVANCE RIKO, Inc. (Kanagawa, Japan) for comprehensive help of thermoelectric evaluation. This study was partially supported by the JSPS KAKENHI (Grant Number 17K20065). AKKK would like to thank start-up fund from Thousand Young Talents Program of China and Shenzhen Peacock Team Project (No. KQTD2016030111203005). Publisher Copyright: © The Royal Society of Chemistry.

PY - 2018

Y1 - 2018

N2 - As a thermoelectric (TE) material suited to applications for recycling waste-heat into electricity through the Seebeck effect, poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid) (PEDOT:PSS) is of great interest. Our research demonstrates a comprehensive study of different post-treatment methods with nitric acid (HNO3) to enhance the thermoelectric properties of PEDOT:PSS. The optimum conditions are obtained when PEDOT:PSS is treated with HNO3 for 10 min at room temperature followed by passing nitrogen gas (N2) with a pressure of 0.2 MPa. Upon this treatment, PEDOT:PSS changes from semiconductor-like behaviour to metal-like behaviour, with a simultaneous enhancement in the electrical conductivity and Seebeck coefficient at elevated temperature, resulting in an increase in the thermoelectric power factor from 0.0818 to 94.3 μW m−1 K−2 at 150 °C. The improvement in the TE properties is ascribed to the combined effects of phase segregation and conformational change of the PEDOT due to the weakened coulombic attraction between PEDOT and PSS chains by nitric acid as well as the pressure of the N2 gas as a mechanical means.

AB - As a thermoelectric (TE) material suited to applications for recycling waste-heat into electricity through the Seebeck effect, poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonic acid) (PEDOT:PSS) is of great interest. Our research demonstrates a comprehensive study of different post-treatment methods with nitric acid (HNO3) to enhance the thermoelectric properties of PEDOT:PSS. The optimum conditions are obtained when PEDOT:PSS is treated with HNO3 for 10 min at room temperature followed by passing nitrogen gas (N2) with a pressure of 0.2 MPa. Upon this treatment, PEDOT:PSS changes from semiconductor-like behaviour to metal-like behaviour, with a simultaneous enhancement in the electrical conductivity and Seebeck coefficient at elevated temperature, resulting in an increase in the thermoelectric power factor from 0.0818 to 94.3 μW m−1 K−2 at 150 °C. The improvement in the TE properties is ascribed to the combined effects of phase segregation and conformational change of the PEDOT due to the weakened coulombic attraction between PEDOT and PSS chains by nitric acid as well as the pressure of the N2 gas as a mechanical means.

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ER -

Simultaneous improvement in electrical conductivity and Seebeck coefficient of PEDOT:PSS by N₂ pressure-induced nitric acid treatment

Abstract

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