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 journalArticle

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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 languageEnglish
Pages (from-to)36563-36570
Number of pages8
JournalRSC Advances
Volume8
Issue number64
DOIs
Publication statusPublished - Jan 1 2018

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Nitric Acid
Seebeck coefficient
Nitric acid
Acids
Gases
Seebeck effect
Waste heat
Thermoelectric power
Recycling
Nitrogen
Electricity
Metals
Semiconductor materials
Temperature
Electric Conductivity
poly(3,4-ethylene dioxythiophene)
styrenesulfonic acid polymer

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Simultaneous improvement in electrical conductivity and Seebeck coefficient of PEDOT:PSS by N2 pressure-induced nitric acid treatment. / Zar Myint, May Thu; Hada, Masaki; Inoue, Hirotaka; Marui, Tatsuki; Nishikawa, Takeshi; Nishina, Yuta; Ichimura, Susumu; Umeno, Masayoshi; Ko Kyaw, Aung Ko; Hayashi, Yasuhiko.

In: RSC Advances, Vol. 8, No. 64, 01.01.2018, p. 36563-36570.

Research output: Contribution to journalArticle

Zar Myint, May Thu ; Hada, Masaki ; Inoue, Hirotaka ; Marui, Tatsuki ; Nishikawa, Takeshi ; Nishina, Yuta ; Ichimura, Susumu ; Umeno, Masayoshi ; Ko Kyaw, Aung Ko ; Hayashi, Yasuhiko. / Simultaneous improvement in electrical conductivity and Seebeck coefficient of PEDOT:PSS by N2 pressure-induced nitric acid treatment. In: RSC Advances. 2018 ; Vol. 8, No. 64. pp. 36563-36570.
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