Toposelective electrochemical desorption of thiol SAMs from neighboring polycrystalline gold surfaces.
We describe a method for the selective desorption of thiol self-assembled monolayers from gold surfaces having micrometer-scale separations on a substrate. In an electrolyte solution, the electrical resistance between the adjacent areas can be much lower than the resistance between a surface and the counter electrode. Also, both reductive and oxidative thiol desorption may occur. Therefore, the potentials of the surfaces must be independently controlled with a multichannel potentiostat and operating windows for a given thiol/electrolyte system must be established. In this study operating windows were established for 1-dodecanethiol-based SAMs in phosphate buffer, phosphate-buffered saline, and sodium hydroxide solution, and selective SAM removal was successfully performed in a four-electrode configuration.
Tencer
Michal
M
University of Ottawa, School of Information Technology and Engineering, 161 Louis Pasteur Street, Ottawa, Ontario K1N 6N5, Canada. mtencer@site.uottawa.ca
Berini
Pierre
P
D003460:Crystallization; D004563:Electrochemistry / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry*
D013438:Sulfhydryl Compounds; D006046:Gold