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Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics

Jonathan Atoyo, Matthew Burton Orcid Logo, James McGettrick Orcid Logo, Matt Carnie Orcid Logo

Polymers, Volume: 12, Issue: 3, Start page: 559

Swansea University Authors: Jonathan Atoyo, Matthew Burton Orcid Logo, James McGettrick Orcid Logo, Matt Carnie Orcid Logo

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DOI (Published version): 10.3390/polym12030559

Abstract

A two-step approach of improving the thermoelectric properties of Poly(3,4-ethylenedioxythiophene)poly(4-styrenesulfonate) (PEDOT:PSS) via the addition of the ionic liquid, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM:TFSI) and subsequent reduction with NaBH4 is presented. The...

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Published in: Polymers
ISSN: 2073-4360
Published: MDPI AG 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53695
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spelling 2020-08-17T14:15:03.5253288 v2 53695 2020-03-02 Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics 0d5e5f1eb1a5104f5b8166fbc981b449 Jonathan Atoyo Jonathan Atoyo true false 2deade2806e39b1f749e9cf67ac640b2 0000-0002-0376-6322 Matthew Burton Matthew Burton true false bdbacc591e2de05180e0fd3cc13fa480 0000-0002-7719-2958 James McGettrick James McGettrick true false 73b367694366a646b90bb15db32bb8c0 0000-0002-4232-1967 Matt Carnie Matt Carnie true false 2020-03-02 FGSEN A two-step approach of improving the thermoelectric properties of Poly(3,4-ethylenedioxythiophene)poly(4-styrenesulfonate) (PEDOT:PSS) via the addition of the ionic liquid, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM:TFSI) and subsequent reduction with NaBH4 is presented. The addition of 2.5 v/v% of EMIM:TFSI to PEDOT:PSS increases the electrical conductivity from 3 S·cm−1 to 1439 S·cm−1 at 40 °C. An additional post treatment using the reducing agent, NaBH4, increases the Seebeck coefficient of the film from 11 µV·K−1 to 30 µV·K−1 at 40 °C. The combined treatment gives an overall improvement in power factor increase from 0.04 µW·m−1·K−2 to 33 µW·m−1·K−2 below 140 °C. Raman and XPS measurements show that the increase in PEDOT:PSS conductivity is due to PSS separation from PEDOT and a conformational change of the PEDOT chains from the benzoid to quinoid molecular orientation. The improved Seebeck coefficient is due to a reduction of charge carriers which is evidenced from the UV–VIS depicting the emergence of polarons. Journal Article Polymers 12 3 559 MDPI AG 2073-4360 conducting polymers; PEDOT:PSS thermoelectric; organic thermoelectric; enhanced power factor 3 3 2020 2020-03-03 10.3390/polym12030559 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University UKRI, EP/N020863/1, EP/ L015099/1 2020-08-17T14:15:03.5253288 2020-03-02T10:05:28.4839913 Jonathan Atoyo 1 Matthew Burton 0000-0002-0376-6322 2 James McGettrick 0000-0002-7719-2958 3 Matt Carnie 0000-0002-4232-1967 4 53695__16903__cc299911905348769a9c59ad4f86ca41.pdf 53695.pdf 2020-03-24T17:39:27.7028336 Output 5044015 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics
spellingShingle Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics
Jonathan Atoyo
Matthew Burton
James McGettrick
Matt Carnie
title_short Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics
title_full Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics
title_fullStr Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics
title_full_unstemmed Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics
title_sort Enhanced Electrical Conductivity and Seebeck Coefficient in PEDOT:PSS via a Two-Step Ionic liquid and NaBH4 Treatment for Organic Thermoelectrics
author_id_str_mv 0d5e5f1eb1a5104f5b8166fbc981b449
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73b367694366a646b90bb15db32bb8c0
author_id_fullname_str_mv 0d5e5f1eb1a5104f5b8166fbc981b449_***_Jonathan Atoyo
2deade2806e39b1f749e9cf67ac640b2_***_Matthew Burton
bdbacc591e2de05180e0fd3cc13fa480_***_James McGettrick
73b367694366a646b90bb15db32bb8c0_***_Matt Carnie
author Jonathan Atoyo
Matthew Burton
James McGettrick
Matt Carnie
author2 Jonathan Atoyo
Matthew Burton
James McGettrick
Matt Carnie
format Journal article
container_title Polymers
container_volume 12
container_issue 3
container_start_page 559
publishDate 2020
institution Swansea University
issn 2073-4360
doi_str_mv 10.3390/polym12030559
publisher MDPI AG
document_store_str 1
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description A two-step approach of improving the thermoelectric properties of Poly(3,4-ethylenedioxythiophene)poly(4-styrenesulfonate) (PEDOT:PSS) via the addition of the ionic liquid, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM:TFSI) and subsequent reduction with NaBH4 is presented. The addition of 2.5 v/v% of EMIM:TFSI to PEDOT:PSS increases the electrical conductivity from 3 S·cm−1 to 1439 S·cm−1 at 40 °C. An additional post treatment using the reducing agent, NaBH4, increases the Seebeck coefficient of the film from 11 µV·K−1 to 30 µV·K−1 at 40 °C. The combined treatment gives an overall improvement in power factor increase from 0.04 µW·m−1·K−2 to 33 µW·m−1·K−2 below 140 °C. Raman and XPS measurements show that the increase in PEDOT:PSS conductivity is due to PSS separation from PEDOT and a conformational change of the PEDOT chains from the benzoid to quinoid molecular orientation. The improved Seebeck coefficient is due to a reduction of charge carriers which is evidenced from the UV–VIS depicting the emergence of polarons.
published_date 2020-03-03T04:08:02Z
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