| Download | - View final version: Electrochemically driven assembly of mixed dithiol bilayers via sulfur dimers (PDF, 591 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1021/la034959m |
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| Author | Search for: Rifai, S.; Search for: Lopinski, G. P.1; Search for: Ward, T.1; Search for: Wayner, D. D. M.1; Search for: Morin, M. |
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| Affiliation | - National Research Council of Canada. NRC Steacie Institute for Molecular Sciences
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| Format | Text, Article |
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| Abstract | We report on the electroformation of mixed bilayers of rigid (1,4-benzenedimethanethiol) and flexible (1,6-hexanedithiol) dithiols on Au(111) from alkaline aqueous solution. These bilayers are formed by first electrodepositing a monolayer of vertically aligned dithiols. The unreacted dithiols are then oxidatively dimerized with the other dithiols, and a bilayer is formed. ACIS (ac impedance spectroscopy) measurements indicate that the monolayer of the rigid dithiol is a better substrate for dimerization than the flexible dithiol. ACIS also reveals that the electroformation of a bilayer is more complete, and the bilayer has fewer defects than one obtained through chemical incubation. Infrared reflection-absorption spectroscopy provides proof for mixed-bilayer formation of the alkanedithiol with the benzenedimethanethiol having its methylene groups deuterated. The mechanism for bilayer formation via the oxidative dimerization of thiols is supported by high-resolution electron energy loss spectra of bilayers, which show a S-S stretch at 515 cm-1. Our results show that this electrochemical approach is a viable methodology for the formation of complex organic interfaces. |
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| Publication date | 2003-10-14 |
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| Publisher | American Chemical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 12339018 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 2b9ba878-0bb9-4dc2-87a4-1fa06edbed60 |
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| Record created | 2009-09-11 |
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| Record modified | 2020-05-27 |
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