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Abstract
Abstract Potential-induced self-organization of α-cyclodextrin (CyD) on Au(111) surfaces in sodium perchlorate has been investigated by using in-situ scanning tunneling microscopy (STM). Near the open circuit potential (approximately +0.0 V vs. SCE), the CyD molecule adsorbs randomly on bare Au(111) surfaces and the desorption of CyD from Au surfaces is observed at negative potentials less than −0.40 V. On the other hand, it was found that the CyD molecules formed an ordered array with a cylindrical structure on the Au(111) surface in the potential region from −0.20 to −0.15 V. The cylindrical structure in which the cavities of CyD face sideways proved that the structure of the adlayer is formed not by simple epitaxy but by self-organization of the molecules.
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