The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface
The 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 azi...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
Pergamon
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/33714 |
| _version_ | 1848754023784513536 |
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| author | Ciampi, S. Choudhury, M. Ahmad, S. Darwish, Nadim Brun, A. Gooding, J. |
| author_facet | Ciampi, S. Choudhury, M. Ahmad, S. Darwish, Nadim Brun, A. Gooding, J. |
| author_sort | Ciampi, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The 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. |
| first_indexed | 2025-11-14T08:33:49Z |
| format | Journal Article |
| id | curtin-20.500.11937-33714 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:33:49Z |
| publishDate | 2015 |
| publisher | Pergamon |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-337142017-09-13T15:33:37Z The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface Ciampi, S. Choudhury, M. Ahmad, S. Darwish, Nadim Brun, A. Gooding, J. The 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 Journal Article http://hdl.handle.net/20.500.11937/33714 10.1016/j.electacta.2015.10.125 Pergamon restricted |
| spellingShingle | Ciampi, S. Choudhury, M. Ahmad, S. Darwish, Nadim Brun, A. Gooding, J. The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface |
| title | The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface |
| title_full | The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface |
| title_fullStr | The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface |
| title_full_unstemmed | The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface |
| title_short | The impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface |
| title_sort | impact of surface coverage on the kinetics of electron transfer through redox monolayers on a silicon electrode surface |
| url | http://hdl.handle.net/20.500.11937/33714 |