Jaegeun Noh, Dongsun Lee, M. Hara
Jun 30, 1999
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Journal
Japanese Journal of Applied Physics
Abstract
Well-ordered self-assembled monolayers of asymmetric disulfides on graphite were observed by scanning tunneling microscopy (STM). STM images showed that the molecules are oriented parallel to the graphite surface without dissociation of the sulfur-sulfur bond. The adsorption phase of 11-hydroxyundecyl octadecyl disulfide (CH3(CH2)17SS(CH2)11OH) molecules on graphite is governed by the formation of a hydrogen bond with a hydroxyl group facing another hydroxyl group of adjacent molecules. Self-assembled monolayers of octadecyl undecyl disulfide (CH3(CH2)17SS(CH2)10CH3) molecules, on the other hand, showed different ordering periodicity compared to that of hydroxylated disulfide molecules.