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Journal Articles Analytical Chemistry Year : 2012

Use of catechol as selective redox mediator in scanning electrochemical microscopy investigations.

Abstract

The use of catechols, and more specifically of dopamine, as a specific redox mediator for scanning electrochemical microscopy (SECM) investigations was evaluated in the challenging situation of an ultrathin layer deposited on a conductive substrate (carbon materials). Experiments show that dopamine is a well-adapted redox system for SECM in feedback mode and in unbiased conditions. Used as a redox mediator, catechol permits the investigations of modified surfaces without an electrical connection of the sample thanks to fast charge transfer kinetics but with a surface selectivity that does not exist in classical outer-sphere redox mediators. The interest of catechol in SECM as a sensitive redox mediator is exemplified by monitoring several modification steps of an ultrathin (<1 nm) hierarchically porous organic monolayer deposited on carbon substrates. For quantitative analysis, the SECM approach curves using dopamine could simply be characterized with an irreversible electron transfer kinetics model in a large range of pH.
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Dates and versions

hal-00741039 , version 1 (11-10-2012)

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Sébastien Lhenry, Yann Leroux, Philippe Hapiot. Use of catechol as selective redox mediator in scanning electrochemical microscopy investigations.. Analytical Chemistry, 2012, 84 (17), pp.7518-24. ⟨10.1021/ac301634s⟩. ⟨hal-00741039⟩
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