Ag UPD on Au(100) and Au(111)

Stability of underpotentially deposited Ag layers on a Au(111) surface studied by surface X-ray scattering

“…Underpotential deposition (upd) is one of the best techniques to prepare ultrathin metal films on single crystal electrode surfaces with well-defined atomic arrangements [1][2][3]. The potential dependent structures of upd metal films with atomic resolution have been studied in situ by scanning tunneling microscopy (STM) [1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], atomic force microscopy (AFM) [22,23], and surface X-ray scattering (SXS) [24][25][26][27][28][29][30][31][32].…”

“…Thus, it is very important to know the structural stability of the upd films under these conditions. Upd of Ag is one of the most studied systems and the structure of Ag upd layers prepared on Au(111) has been extensively studied with an atomic resolution [4][5][6]10,12,19,20,29]. We also have studied the structure of Ag upd layers on Au(111) using in situ SXS and found that pseudomorphic Ag monolayer and bilayer are formed on Au(111) surface at 50 mV (vs. Ag/Ag + ) and 10 mV, respectively [29].…”

Electrodeposition of Ag and Pd on a reconstructed Au(1 1 1) electrode surface studied by in situ scanning tunneling microscopy

“…Electrochemical deposition of Ag on Au(111) electrode surface is a good model system to study the morphology of the deposited layer because the interaction and the lattice misfit between a metal deposit and a substrate is very strong and negligibly small (0.4 %), respectively [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and has been studied by a wide variety of techniques, including scanning tunneling microscopy (STM) [1,2,5,8,9,14,16], atomic force microscopy (AFM) [3,4,6], second harmonic generation (SHG) spectroscopy [13], quartz crystal microbalance (QCM) [7], X-ray diffraction [11,12] and extended X-ray absorption fine structure (EXAFS) [10]. In particular underpotential deposition (UPD) of Ag has received special attention and the structures of adsorbates, both metal and anion, and their dependencies on the potential and electrolyte composition have been well studied [2][3][4][5][6].…”

“…In particular underpotential deposition (UPD) of Ag has received special attention and the structures of adsorbates, both metal and anion, and their dependencies on the potential and electrolyte composition have been well studied [2][3][4][5][6]. It has been reported that UPD Ag layer of various coverage up to two monolayer is formed depending on the electrode potential [14,15].…”

In situ structural study on underpotential deposition of Ag on Au(111) electrode using surface X-ray scattering technique

“…Furthermore, the CVs reported by various groups are not necessarily the same and some of the peaks are very small or missing in some cases particularly at the evaporated gold electrode, maybe because the quality of the surface was not high. To clarify the details of each process, a wide variety of techniques such as STM [14][15][16][17][18][19], AFM [20,21], electrochemical quartz crystal microbalance (EQCM) [22], second harmonic generation (SHG) [23], UHV techniques such as low energy electron diffraction (LEED) [21,24], surface extended X-ray absorption fine structure 2 (EXAFS) using X-ray from a synchrotron radiation source [25], and X-ray diffraction (XRD) using a conventional laboratory X-ray source [26,27] have been applied. STM measurements in a sulfuric acid solution showed an ordered (bi)sulfate adlayer with the (√3 × √7)R19.1° structure [19] and the Ag UPD layer with the (√3 × √3)R30° structure [14,15,19] in the potential region more positive and negative, respectively, than the first UPD peak.…”