Zipping and unzipping monolayers: switchable monolayer oligomerization and adhesion via thiol–disulfide interconversion

Abstract

Triphenyleneethynylene (TPE) monolayers at the solution–HOPG interface are oligomerized by the oxidation of pendant thioethers to form disulfide cross-links. The oligomerized TPE monolayer adheres strongly to HOPG. Disulfide reduction unzips the oligomers to form a monomeric TPE monolayer with pendant thiols. Subsequent oxidation and reduction treatments zip and unzip the monolayer.