Scanning tunneling microscopy investigation of silver deposition upon Au(111) in the presence of chloride

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Using electrochemical measurements and in situ scanning tunneling microscopy (STM), we confirm the process of Ag growth and the overlayer structures of Ag underpotential deposition (upd) on Au(111) in the presence or absence of chloride anions. There are four distinct structures of the Ag adlayer on Au(111) in the presence of chloride. Adlayer structures (root3 x root3)R30degrees, (root19 x root19)R37degrees, (root13 x root13)R46degrees, and (6 x 6) are formed as a function of potential, and these structures are clearly matched to the features in a cyclic voltammogram. Compared with the (4 x 4) structure of Ag upd on Au(1 11) in a pure 0.1 M HClO4 solution, overlayer structures of Ag on Au(111) in a chloride-containing solution are more loosely packed. Therefore, we conclude that the structures of the Ag overlayer on Au(111) strongly interact with chloride anions, suggesting the bilayer structure is composed of both Ag and Cl.
Publisher
AMER CHEMICAL SOC
Issue Date
2002-10
Language
English
Article Type
Article
Keywords

SINGLE-CRYSTAL SURFACES; IN-SITU STM; UNDERPOTENTIAL DEPOSITION; COPPER DEPOSITION; AQUEOUS-SOLUTION; METAL-SURFACES; STEP DYNAMICS; EX-SITU; ADSORPTION; GOLD

Citation

LANGMUIR, v.18, no.21, pp.8025 - 8032

ISSN
0743-7463
URI
http://hdl.handle.net/10203/21188
Appears in Collection
CH-Journal Papers(저널논문)
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