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Faradaic impedance titration and control of electron transfer of 1-(12-mercaptododecyl)imidazole monolayer on a gold electrode

Title
Faradaic impedance titration and control of electron transfer of 1-(12-mercaptododecyl)imidazole monolayer on a gold electrode
Authors
Hwang S.Lee B.S.Chi Y.S.Kwak J.Choi I.S.Lee S.-g.
Ewha Authors
이상기
SCOPUS Author ID
이상기scopus
Issue Date
2008
Journal Title
Electrochimica Acta
ISSN
0013-4686JCR Link
Citation
vol. 53, no. 5, pp. 2630 - 2636
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In this work, we studied interfacial proton transfer of the self-assembled monolayer (SAM) of 1-(12-mercaptododecyl)imidazole on a gold electrode by faradaic impedance titration method with Fe(CN)63- as an anionic redox probe molecule. The surface pK1/2 was found to be 7.3, which was nearly the same as that of 1-alkylimidazole in solution. We also investigated the electrochemical properties of the SAM-modified electrode by cyclic voltammetry. Cyclic voltammetry was performed (1) in the solution containing Fe(CN)63- with repeated alternation of pH values to investigate the electrostatic interaction of the protonated or deprotonated imidazole with Fe(CN)63- and (2) in the acidic or basic electrolyte containing Ru(NH3)63+ as a cationic redox probe to verify the effect of the polarity of a redox probe. We observed the reversible adsorption/desorption of Fe(CN)63- and concluded that the adsorbed Fe(CN)63- catalyzed the electron transfer of both Fe(CN)63- itself and cationic Ru(NH3)63+. © 2007 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.electacta.2007.10.043
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자연과학대학 > 화학·나노과학전공 > Journal papers
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