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Article Dans Une Revue ChemPhysChem Année : 2021

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

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Viacheslav Shkirskiy
Eric Levillain
Christelle Gautier

Résumé

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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Chimie
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Dates et versions

hal-03432298 , version 1 (22-11-2021)

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