Abstract
Au(111) surfaces are exposed to solutions containing both octanethiol and dithiocarbamate (DTC) molecules, and the resulting surface composition and structure are studied using scanning tunneling microscopy (STM). DTC adsorption and monolayer formation are favored when present at the same concentration as octanethiol in solution. Higher octanethiol concentration in solution results in the incorporation of thiol into the resulting monolayer, with a strong dependence on the chain length of the DTC molecules. For diethyldithiocarbamate, thiol adsorption is limited and close-packed thiolate monolayers are not formed even at 100:1 excesses of the thiol in solution. For didecyldithiocarbamate, higher thiol concentrations lead to the formation of full thiolate mononlayers and the complete displacement of DTC.
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