The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface

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dc.contributor.authorCiampi, Sen_AU
dc.contributor.authorChoudhury, MHen_AU
dc.contributor.authorAhmad, SABAen_AU
dc.contributor.authorDarwish, Nen_AU
dc.contributor.authorLe Brun, APen_AU
dc.contributor.authorGooding, JJen_AU
dc.date.accessioned2024-12-05T02:22:24Zen_AU
dc.date.available2024-12-05T02:22:24Zen_AU
dc.date.issued2015-12-20en_AU
dc.date.statistics2024-08-28en_AU
dc.description.abstractThe impact of the coverage of ferrocene moieties, attached to a silicon electrode modified via hydrosilylation of a dialkyne, on the kinetics of electron transfer between the redox species and the electrode is explored. The coverage of ferrocene is controlled by varying the coupling time between azidomethylferrocene and the distal alkyne of the monolayer via the copper assisted azide-alkyne cycloaddition reaction. All other variables in the surface preparation are maintained identical. What is observed is that the higher the surface coverage of the ferrocene moieties the faster the apparent rates of electron transfer. This surface coverage-dependent kinetic effect is attributed to electrons hopping between ferrocene moieties across the redox film toward hotspots for the electron transfer event. The origin of these hotspots is tentatively suggested to result from minor amounts of oxide on the underlying silicon surface that reduce the barrier for the electron transfer. © 2015 Elsevier Ltd.en_AU
dc.description.sponsorshipThis research was supported by the Australian Research Council's Discovery Projects Funding Scheme (DP1094564 and DP150103065). We would also like to thank Professor Christian Amatore for useful discussions on this data.en_AU
dc.identifier.citationCiampi, S., Choudhury, M. H., Ahmad, S. A. B. A., Darwish, N., Brun, A. L., & Gooding, J. J. (2015). The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface. Electrochimica Acta, 186, 216-222. doi.:10.1016/j.electacta.2015.10.125en_AU
dc.identifier.issn0013-4686en_AU
dc.identifier.journaltitleElectrochimica Actaen_AU
dc.identifier.pagination216-222en_AU
dc.identifier.urihttps://doi.org/10.1016/j.electacta.2015.10.125en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15768en_AU
dc.identifier.volume186en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectSurfacesen_AU
dc.subjectKineticsen_AU
dc.subjectElectron transferen_AU
dc.subjectSiliconen_AU
dc.subjectElectrodesen_AU
dc.subjectAzidesen_AU
dc.subjectOxidesen_AU
dc.subjectCouplingen_AU
dc.titleThe impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surfaceen_AU
dc.typeJournal Articleen_AU
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