Abstract
The adsorption of thiols on different metal surfaces has been studied using potentiometric measurements. The adsorption is a complex process that comprises a few steps. The first involves negative charge transfer to the electrode surface as evidenced by a sharp negative shift of the open circuit potential (ocp). The charge that is accumulated on the electrode surface is discharged through a reduction process that involves either water or oxygen reduction. The rate of the discharging process depends strongly on the overpotential of the electrode material for water reduction, the medium, and to some extent, on additional functional groups that the thiol bears. A detailed general mechanism that is in agreement with our findings is proposed and discussed.
Original language | English |
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Pages (from-to) | 267-276 |
Number of pages | 10 |
Journal | Journal of Electroanalytical Chemistry |
Volume | 550-551 |
DOIs | |
State | Published - 17 Jul 2003 |
Bibliographical note
Funding Information:This work was supported by the DFG in the frame of Tri-Lateral Projects.
Keywords
- Ag
- Au
- Hg
- Open circuit potential
- Potentiometry
- Self-assembled monolayers
- Thiols