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A new sensor with increased lifetime based on a mixed diazonium thick film/gold nanoparticles interface for Hg(II) trace detection

Fezai, Fatma and Séverac, Childerick and Gros, Pierre and Meireles, Martine and Evrard, David A new sensor with increased lifetime based on a mixed diazonium thick film/gold nanoparticles interface for Hg(II) trace detection. (2020) Electroanalysis, 32 (1). 1-6. ISSN 1521-4109

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Official URL: https://doi.org/10.1002/elan.201900434

Abstract

This work describes a novel strategy for surface functionalization, the aim of which is to significantly increase the lifetime of an electrochemical sensor dedicated to Hg(II) trace determination. In order to tailor stable mixed organic/inorganic interfaces, gold nanoparticles were electrodeposited onto a glassy carbon electrode previously functionalized by a thick 4-thiophenol diazonium film, which affords a good anchoring to the nanoparticles. AFM and FEG-SEM were used to characterize the film thickness and the nanoparticles average size and density, respectively. By using square wave anodic stripping voltammetry, the sensor exhibited a linear response between 1 and 10 nM Hg(II) and a normalized sensitivity 0.03 µA nM-1 min-1. Compared to previous works, the storage lifetime of the interface was at least three times longer, being more than three weeks.

Item Type:Article
HAL Id:hal-02379936
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Funders:
Agence Française de la Recherche - ANR (France)
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Deposited On:02 Apr 2020 10:23

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