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Quaternary phosphonium-based (TPQPCl)-ionomer/graphite nanoplatelets composite chemically modified electrodes: a novel platform for sensing applications

Sandra Hernandez Aldave, Robert B. Kaspar, Michael P. Letterio, Afshin Tarat, Yushan Yan, Paolo Bertoncello Orcid Logo

Journal of Materials Chemistry C, Volume: 6, Issue: 48, Pages: 13293 - 13304

Swansea University Authors: Sandra Hernandez Aldave, Paolo Bertoncello Orcid Logo

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DOI (Published version): 10.1039/c8tc04967j

Abstract

Ionomers have attracted considerable interest in electroanalysis due to the possibility of fabricating electrode coatings capable of preconcentrating sub-micromolar concentrations of cations or anions of analytical relevance. In this work, we describe the electroanalytical performances of an ionomer...

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Published in: Journal of Materials Chemistry C
ISSN: 2050-7526 2050-7534
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa45892
Abstract: Ionomers have attracted considerable interest in electroanalysis due to the possibility of fabricating electrode coatings capable of preconcentrating sub-micromolar concentrations of cations or anions of analytical relevance. In this work, we describe the electroanalytical performances of an ionomer (TPQPCl)/graphite nanoplatelets composite material towards the development of an amperometric sensor for detection of ascorbic acid. Graphite nanoplatelets at different concentrations were dispersed in ethanolic solutions containing TPQPCl. The as-prepared TPQPCl/graphite nanoplatelet-coated electrodes were characterised using Fe(CN)64−/3− as an anionic redox probe. The results evidence the good preconcentration capability of the positively charged TPQPCl towards the incorporation of negatively charged species. By tuning the ionomer/graphite nanoplatelets ratio, it is possible to detect simultaneously ascorbic acid even in the presence of dopamine as an interference species. The TPQPCl/graphite nanoplatelet-coated electrodes were able to detect ascorbic acid in the linear range of 5–10 000 μM with a limit of detection calculated as 4.8 μM using linear sweep voltammetry. Finally, the TPQPCl/graphite nanoplatelet-coated electrodes were tested towards detection of ascorbic acid in vitamin C tablets and orange juice without any sample pretreatment.
Keywords: ionomer membranes, sensors
College: Faculty of Science and Engineering
Funders: EPSRC: EP/L013797/1, "Nanostructured Conductive Anion Exchange Composite Thin Films for Electrocatalytic Applications"
Issue: 48
Start Page: 13293
End Page: 13304

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