The Adlayers of 6-Anilino-1,3,5-Triazine-2,4-Dithiol Monosodium on Au(111) Electrode in Acidic Solution Studied by Electrochemical Scanning Tunneling Microscopy

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We investigated the electrochemical behavior of the triazinedithiol derivative (TAD), 6-anilino-1,3,5-triazine-2,4-dithiol monosodium (ATDS), on a Au(111) electrode surface in 0.05 M HClO4 using electrochemical measurements and scanning tunneling microscopy (STM). The oxidation of Au was significantly suppressed by modifying Au with ATDS. It was found that each ATDS molecule formed an agglomerate recognized as a set of three bright spots on the Au(111). The agglomerate was also in part linearly ordered along the √3 direction, and no definite phase transition was seen, which was supported by the fact that the CV curve was degenerated by ATDS molecules adsorbed on the electrode in the double-layer region. This result differed from previously reported results of the CV and ECSTM measurements for the 6-octylthio-1,3,5-triazine-2,4-dithiol monosodium (OTDS)-modified Au(111) electrode. The ATDS molecule formed significantly stable adlayer structures on the Au(111). This might contribute to the relatively high corrosion inhibition ability of the ATDS molecule.