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Self-assembly of thiolates with alicyclic moieties on Au(111)

Self-assembled monolayers (SAMs) of thiolates with a cycloalkane or a bicycloalkane moiety were formed on Au(111). The structure of the SAMs was characterized using scanning tunnelling microscopy (STM) and compared with that of linear alkane thiolates. In addition, their electrical properties in terms of dependence of tunnelling currents on the number of the alkane chains in the alicyclic moieties were investigated. For this purpose, we prepared mixed SAMs, in which two of three kinds of thiolate were molecularly mixed. By comparing STM height differences between the two thiolates in the mixed SAMs in a constant-current mode, the charge transport properties were investigated.