Electrodeposition of bilayers of dithiols

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DOIResolve DOI: http://doi.org/10.1016/S0022-0728(02)01069-0
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TypeArticle
Journal titleJournal of Electroanalytical Chemistry
Volume531
Pages111118; # of pages: 8
Subject1; Au(111) Electrode; Bilayers; Dithiols; Electrochemical Quartz Crystal Microbalance; Self Assembly
AbstractWe report an electrochemical method to form a bilayer of dithiol. The cyclic voltammogram of the oxidative deposition of an aromatic dithiol on gold from an alkaline aqueous solution reveals two current peaks separated by more than 400 mV. The integrated charge of the oxidative current peak (B) at the most positive potential is twice that of the other oxidative current peak (A). These two oxidative current peaks were characterized by differential capacitance and electrochemical quartz crystal microbalance (EQCM) measurements. A decrease of the capacity by a factor of two, and an increase of the EQCM frequency change by a factor of two were observed when the potential was scanned from a value where only the first oxidative peak (A) is obtained, to a potential where both oxidative current peaks (A and B) are obtained. Infrared spectra show that the aromatic dithiols adsorb vertically at potentials corresponding to the current peak A and they become tilted for potentials corresponding to the current peak B. The simple relationships between the properties of the two oxidative current peaks are found to be compatible with a step-wise oxidative deposition of a bilayer of dithiol.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12327462
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Record identifierd5d83965-5a20-4b0a-bd18-ac596bedf307
Record created2009-09-10
Record modified2016-05-09
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