Stability of underpotentially deposited Ag layers on a Au(1 1 1) surface studied by surface X-ray scattering |
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| Authors: | Toshihiro Kondo Satoru Takakusagi Kohei Uosaki |
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| Affiliation: | 1. Physical Chemistry Laboratory, Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan;2. International Center for Materials Nanoarchitectonics Satellite (MANA), National Institute of Material Science (NIMS), Sapporo 060-0810, Japan;3. Division of Science, Graduate School of Humanities and Sciences, Ochanomizu University, Ohtsuka, Bunkyo-ku, Tokyo 112-8610, Japan |
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| Abstract: | Stability of underpotentially deposited (upd) Ag layers on Au(1 1 1) surface was investigated by surface X-ray scattering (SXS). While the complete pseudomorphic Ag bilayer on Au(1 1 1) surface obtained by upd at 10 mV (vs. Ag/Ag+) was maintained its structure even after the circuit was disconnected and the surface was exposed to ambient atmosphere, the pseudomorphic Ag monolayer obtained by upd at 50 mV was converted to a partial bilayer with the coverage of 0.66 and 0.46 ML for the 1st and 2nd layer, respectively. These results show that Ag bilayer is structurally more stable than Ag monolayer on Au(1 1 1) and Ag atoms of the upd monolayer move around on the Au(1 1 1) surface without potential control. |
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