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Signal amplification by electro-oligomerisation for improved isoproturon detection

Abstract : A novel concept is introduced for signal amplification in electrochemical sensing: the electrooligomerisation stripping voltammetry, which has been applied here to the improved detection of the isoproturon herbicide in spring waters as a proof-of-principle. It involves a potentiostatic accumulation step onto a glassy carbon electrode (at +1.5 V vs Ag/AgCl reference electrode for 300 s) leading to the formation of an oligomeric film, which is then detected by cathodic stripping square wave voltammetry (SWV). The presence and composition of the film are confirmed by confocal Raman spectroscopy. Its characterisation by cyclic voltammetry demonstrates the reversible nature of the electrodeposited material, confirming its interest for sensitive detection by SWV. Adding a mesoporous silica membrane with vertically oriented nanochannels further enhances the sensitivity of the sensor, exhibiting a linear response in the 10-100 µM concentration range. This effect was even more interesting for real media analysis thanks to the permselective properties of such nanoporous coating in rejecting interferences and/or surface fouling agents. The method should be applicable to other analytes that are usually not detectable by conventional accumulation/stripping voltammetry.
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https://hal.univ-lorraine.fr/hal-02947712
Contributor : Grégoire Herzog <>
Submitted on : Tuesday, December 1, 2020 - 10:34:53 AM
Last modification on : Thursday, March 11, 2021 - 2:26:02 PM
Long-term archiving on: : Tuesday, March 2, 2021 - 6:40:31 PM

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Tauqir Nasir, Alonso Gamero-Quijano, Christelle Despas, Manuel Dossot, Grégoire Herzog, et al.. Signal amplification by electro-oligomerisation for improved isoproturon detection. Talanta, Elsevier, 2020, 220, pp.121347. ⟨10.1016/j.talanta.2020.121347⟩. ⟨hal-02947712⟩

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