2024-03-28T17:04:41Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/502202022-11-17T02:08:08Zhdl_2115_20039hdl_2115_116Electrochemical Metal Deposition on Top of an Organic MonolayerQu, DeyuUosaki, Kohei431Electrochemical deposition of metals (platinum or gold) only on top of an organothiolate, 1,4-benzene-dimethanethiol (BDMT) or hexanedithiol (HDT), self-assembled monolayer (SAM) on a Au(111) substrate was achieved by electrochemical reduction of PtCl4^[2-] or AuCl^[4-] ion, which was preadsorbed on one free thiol end group of the dithiol SAM formed on a Au surface, in a metal-ion-free sulfuric acid solution at potentials more negative than the reduction potential of the metal ion. Angle-resolved X-ray photoelectron spectroscopy (AR-XPS) measurement after the reduction of preadsorbed PtCl4^[2-] ion on BDMT/Au(111) electrode showed the presence of Pt not underneath but on top of the BDMT SAM. After a negative potential scan of the Pt/BDMT/Au(111) electrode to -1.30 V in 0.1 M KOH solution, a typical cyclic voltammogram of a clean Au(111) electrode was obtained, showing that the BDMT SAM with a Pt layer was reductively desorbed. These results proved that a Pt-BDMT SAM-Au substrate sandwich structure without a short circuit between the two metals was successfully constructed by this technique. Furthermore, a decanethiol (DT) monolayer was constructed on a Au layer, which was formed by the reduction of preadsorbed AuCl4^[-] ion on HDT/Au(111) electrode. The formation of DT/Au/HDT/Au(111) structure was confirmed as two cathodic peaks corresponding to reductive desorption of DT from Au on top of the HDT/Au(111) at -0.97 V and that of Au/ HDT from Au(111) at -1.12 V were observed when potential was scanned negatively to -1.35 V.American Chemical SocietyJournal Articleapplication/pdfhttp://hdl.handle.net/2115/50220https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/50220/1/JPCB110-35_17570-17577.pdf1520-61061520-5207Journal of Physical Chemistry B1103517570175772006-09-07enginfo:pmid/16942100info:doi/10.1021/jp0632135publisher