Nanoscale observation of dissociative adsorption during self-assembly processes of dialkyl disulfides on Au(111)
نویسندگان
چکیده
The formation of striped phases of dialkyl disulfides on Au(111) and graphite has been monitored by scanning tunneling microscopy (STM). STM imaging clearly exhibits the formation of striped phases having corrugation periodicities that are nearly consistent with the molecular length of alkanethiolate moieties formed after the S-S bond cleavage of dialkyl disulfide on a gold surface. This is the first direct observation of the dissociative adsorption of disulfides on the nanometer scale. Self-assembled monolayers (SAMs) of dialkyl disulfide on a graphite surface displayed longrange, well-ordered monolayers with one striped pattern that shows periodicity as a function of molecular length via nondissociative adsorption. In this study, we have demonstrated a new, simple and insightful method of comparing monolayers chemisorbed on Au(111) with those physisorbed on graphite.
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