Algarni, S.A., Althagafi, T.M., Al Naim, A. et al. (1 more author) (2016) A water-gated organic thin film transistor as a sensor for water-borne amines. Talanta. ISSN 0039-9140
Abstract
The p-type semiconducting polymer Poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) displays innate sensitivity to water-borne amines. We demonstrate this with the help of water- gated PBTTT thin film transistors (TFTs). When octylamine is added to the gating water, TFTs respond with a significantly reduced saturated drain current. Underlying TFT drift is minimised by initial conditioning, and remaining drift can be accounted for by normalising current response to the current level under purge immediately before exposure. Normalised current response vs. amine concentration is reproducible between different transistors, and can be modelled by a Langmuir surface adsorption isotherm, which suggests physisorption of analyte at the PBTTT surface, rather than bulk penetration. Same PBTTT transistors do not respond to 1- octanol, confirming the specific affinity between amines and thiophene- based organic semiconductors.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Elsevier |
Keywords: | Thin film transistor; PBTTT; Octylamine; Biosensor |
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) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 11 Mar 2016 15:43 |
Last Modified: | 05 Nov 2017 20:00 |
Published Version: | https://dx.doi.org/10.1016/j.talanta.2016.01.068 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.talanta.2016.01.068 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:95850 |