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Capacitive Impedance for Following In‐Situ Grafting Kinetics of Diazonium Salts

Abstract : A new method to follow in-situ grafting kinetics of diazonium compounds based on imposing small amplitude high frequency AC oscillations at grafting potential, is outlined. This enables the time-resolved measurements of capacitive impedance concomitantly with the growth of the organic layer at the working electrode. The impedance values were quantitatively correlated with the ex-situ (from voltammograms) and in-situ (from quartz crystal microbalance) measured surface coverages, providing a validation of the new methodology. The versatility of the developed approach was demonstrated on the grafting via reduction of 4-nitrobenzenediazonium on Au and glassy carbon (GC) substrates and via deposition of in-situ generated diazonium salts from 1-aminoanthraquinone and 4-ferrocenylaniline on GC. The capacitive impedance measurements are simple, fast, and non-destructive, making it an appealing methodology for an exploration of grafting kinetics of a wide range of diazonium salts.
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https://hal.univ-angers.fr/hal-03432298
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Soumis le : lundi 22 novembre 2021 - 11:54:26
Dernière modification le : dimanche 26 juin 2022 - 03:20:40
Archivage à long terme le : : mercredi 23 février 2022 - 18:49:57

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Viacheslav Shkirskiy, Eric Levillain, Christelle Gautier. Capacitive Impedance for Following In‐Situ Grafting Kinetics of Diazonium Salts. ChemPhysChem, Wiley-VCH Verlag, 2021, 22 (11), pp.1074-1078. ⟨10.1002/cphc.202100154⟩. ⟨hal-03432298⟩

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