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A facile electrochemical intercalation and microwave assisted exfoliation methodology applied to screen-printed electrochemical-based sensing platforms to impart improved electroanalytical outputs

Abstract

Screen-printed electrodes (SPEs) are ubiquitous within the field of electrochemistry allowing researchers to translate sensors from the laboratory to the field. In this paper, we report an Electrochemically Driven Intercalation process where the electrochemical reaction uses an electrolyte as a conductive media as well as the intercalation source, which is followed by exfoliation and heating/drying via microwave irradiation, applied to the working electrode of screen-printed electrodes / sensors (termed EDI-SPEs) for the first time. This novel methodology results in an increase up to 85% of the sensor area (electrochemically active surface area, as evaluated using an outer-sphere redox probe). Upon further investigation, it is found that the increase in the electroactive area of the EDI-screen-printed based electrochemical sensing platforms is critically dependent upon the analyte and its associated electrochemical mechanism (i.e. adsorption vs. diffusion). Proof-of-concept for the electrochemical sensing of capsaicin, a measure of the hotness of chillies and chilli sauce, within both model aqueous solutions and a real sample (Tabasco sauce) is demonstrated in which the electroanalytical sensitivity (a plot of signal vs. concentration) is doubled when utilising EDI-SPEs over that of SPEs.

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Publication details

The article was received on 07 Dec 2017, accepted on 17 May 2018 and first published on 18 May 2018


Article type: Paper
DOI: 10.1039/C7AN01982C
Citation: Analyst, 2018, Accepted Manuscript
  • Open access: Creative Commons BY license
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    A facile electrochemical intercalation and microwave assisted exfoliation methodology applied to screen-printed electrochemical-based sensing platforms to impart improved electroanalytical outputs

    C. E. Banks, G. Pierini, C. Foster, H. Fernández and S. Neale, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C7AN01982C

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