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dc.contributor.authorCiampi, Simone
dc.contributor.authorEggers, P.
dc.contributor.authorLe Saux, G.
dc.contributor.authorJames, M.
dc.contributor.authorHarper, J.
dc.contributor.authorGooding, J.
dc.identifier.citationCiampi, S. and Eggers, P. and Le Saux, G. and James, M. and Harper, J. and Gooding, J. 2009. Silicon (100) electrodes resistant to oxidation in aqueous solutions: An unexpected benefit of surface acetylene moieties. Langmuir. 25 (4): pp. 2530-2539.

Here we report on the functionalization of alkyne-terminated alkyl monolayers on highly doped Si(100) using "click" reactions to immobilize ferrocene derivatives. The reaction of hydrogen-terminated silicon surfaces with a diyne species was shown to afford very robust functional surfaces where the oxidation of the underlying substrate was negligible. Detailed characterization using X-ray photoelectron spectroscopy, X-ray reflectometry, and cyclic voltammetry demonstrated that the surface acetylenes had reacted in moderate yield to give surfaces exposing ferrocene moieties. Upon extensive exposure of the redox-active architecture to oxidative environments during preparative and characterization steps, no evidence of SiOx contaminants was shown for derivatized SAMs prepared from single-component 1,8-nonadiyne, fully acetylenylated, monolayers. An analysis of the redox behavior of the prepared Si(100) electrodes based on relevant parameters such as peak splitting and position and shape of the reduction/oxidation waves depicted a well-behaved redox architecture whose spectroscopic and electrochemical properties were not significantly altered even after prolonged cycling in aqueous media between -100 and 800 mV versus AglAgCl. The reported strategy represents an experimentally simple approach for the preparation of silicon-based electrodes where, in addition to close-to-ideal redox behavior, remarkable electrode stability can be achieved. Both the presence of a distal alkyne moiety and temperatures of formation above 100 °C were required to achieve this surface stabilization. © Copyright 2009 American Chemical Society.

dc.publisherAmerican Chemical Society
dc.titleSilicon (100) electrodes resistant to oxidation in aqueous solutions: An unexpected benefit of surface acetylene moieties
dc.typeJournal Article
curtin.departmentNanochemistry Research Institute
curtin.accessStatusFulltext not available

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