Althagafi, T.M., Al Garni, S.A. and Grell, M. (2016) Innate cation sensitivity in a semiconducting polymer. Talanta, 158. pp. 70-76. ISSN 0039-9140
Abstract
Water- gated organic thin film transistors (OTFTs) using the hole transporting semiconducting polymer, poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT), show an innate response of their threshold voltage to the addition of divalent metal cations to the gating water, without deliberately introducing an ion- sensitive component. A similar threshold response is shown for several divalent cations, but is absent for monovalent cations. Response is absent for transistors using the inorganic semiconductor ZnO, or the similar organic semiconductor poly(3-hexylthiophene) (rrP3HT), instead of PBTTT. We assign innate cation sensitivity to residues of the organometallic Pd(0) complex used as catalyst in PBTTT synthesis which bears strong resemblance to typical metal chelating agents. Organometallic Pd(0) residues are absent from ZnO, and also from rrP3HT which is polymerised with a different type of catalyst. However, when Pd(0) complex is deliberately added to rrP3HT casting solutions, resulting OTFTs also display threshold response to a divalent cation.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Elsevier. This is an author produced version of a paper subsequently published in Talanta. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
Keywords: | PBTTT; OTFT; electrolyte; organometallic; cation; sensor |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number Royal Embassy of Saudi Arabia, Cultural Bureau, London TU068 Royal Embassy of Saudi Arabia, Cultural Bureau, London TU034 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 26 May 2016 11:42 |
Last Modified: | 20 Jul 2017 17:34 |
Published Version: | https://dx.doi.org/doi:10.1016/j.talanta.2016.05.0... |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.talanta.2016.05.047 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:99849 |
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