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dc.contributor.authorCiampi, S.
dc.contributor.authorGuan, B.
dc.contributor.authorDarwish, Nadim
dc.contributor.authorReece, P.
dc.contributor.authorGooding, J.
dc.date.accessioned2017-01-30T14:33:13Z
dc.date.available2017-01-30T14:33:13Z
dc.date.created2016-05-19T19:30:18Z
dc.date.issued2012
dc.identifier.citationCiampi, S. and Guan, B. and Darwish, N. and Reece, P. and Gooding, J. 2012. Redox-active monolayers in mesoporous silicon. Journal of Physical Chemistry C. 116 (30): pp. 16080-16088.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/39356
dc.identifier.doi10.1021/jp303980x
dc.description.abstract

Herein, redox reactions at chemically derivatized porous silicon (PSi) films are investigated. Passivation of the PSi matrix, by replacing metastable Si-H termini with nonpolar Si-C=C-R linkages, allows the electrochemical PSi device to operate in aqueous environments under oxidizing conditions (i.e., electron hole accumulation regime). Cu(I)-catalyzed alkyne-azide cycloaddition reactions are used to anchor ferrocene derivatives and probe electrochemical reactions at the exceedingly large surface area-to-volume ratio of mesoporous PSi. The forward-biased p-type PSi/electrolyte interface retains a quasi-metallic behavior throughout its entire contour, and it does so for prolonged times even when the electrode is poised at potentials at which a bare silicon electrode would rapidly oxidize. The interfacial capacitance of the PSi matrix is, however, unexpectedly low. An explanation is proposed where PSi morphology and the semiconductor space-charge layer capacitance play a significant role in determining the charging properties of the electrode. These results are important for the application of porous semiconductor electrodes in sensing, electrocatalytic, and energy-conversion devices.

dc.publisherAmerican Chemical Society
dc.titleRedox-active monolayers in mesoporous silicon
dc.typeJournal Article
dcterms.source.volume116
dcterms.source.number30
dcterms.source.startPage16080
dcterms.source.endPage16088
dcterms.source.issn1932-7447
dcterms.source.titleJournal of Physical Chemistry C
curtin.departmentNanochemistry Research Institute
curtin.accessStatusFulltext not available


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