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Article Dans Une Revue Electrochimica Acta Année : 2023

Specific electrochemical sensor for cadmium detection: Comparison between monolayer and multilayer functionalization

Résumé

Selective and sensitive cadmium sensors were prepared by functionalizing glassy carbon electrodes (GCE) using the electrochemical reduction of p-benzoic acid diazonium salts according to either a multilayer or a monolayer coating process. Such modified electrodes were then post-functionalized with 1,2-bis-[o-aminophenylthio]ethane (APTE) or its monoprotected derivative leading to specific Cd2+ electrochemical sensors. The step by step preparation of the electrodes as well as the ability of the immobilized receptor to complex Cd2+ was investigated by XPS and Raman spectroscopy. The detection and quantification of cadmium was performed in two steps: the preconcentration of Cd2+ ions by complexation with immobilized APTE and the analysis by Linear Sweep Stripping Voltammetry (LSSV). More importantly, multilayer versus monolayer grafting has a strong influence on the sensor performances. Whereas calibration curves typical of an equilibrium process were obtained for sensors realized with multilayer organic films, sensors with a monolayer organic film led to linear calibration curves, in the same concentration range. Finally, the monolayer sensor gave a lower limit of detection (LOD) and highlighted better selectivity than unmodified electrode.
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Dates et versions

hal-04205041 , version 1 (18-09-2023)

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Gaël Levanen, Awatef Dali, Yann R. Leroux, Teodora Lupoi, Stéphanie Betelu, et al.. Specific electrochemical sensor for cadmium detection: Comparison between monolayer and multilayer functionalization. Electrochimica Acta, 2023, 464, pp.142962. ⟨10.1016/j.electacta.2023.142962⟩. ⟨hal-04205041⟩
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