4.3 Changes in Surface Stress during UPD
119
4.3.3 Cu-UPD on Au (111)
Roles of Co-Adsorption of Sulfate Ions
Figure 4.9 shows (a) the cyclic voltammograms and (b) the vs. E curves measured
at a potential scan rate of 5 mV s
−1 for the (111)-textured Au thin-film (with a
thickness of 220 nm) electrode in 0.1 M H 2 SO 4 solutions with and without 10
−3 M
CuSO 4 [19]. The solid and dotted curves represent the results in the solutions with and
without Cu
2+ , respectively. The cathodic limit potential of 0.25 V (SHE) in Fig. 4.9
corresponds to the equilibrium potential of 10
−3 M Cu
2+ /Cu electrode. The anodic
limit potential of 0.80 V (SHE) is chosen to avoid the onset of the surface oxygenation
reaction on Au. Two pairs of cathodic and anodic peaks (C 1 /A 1 and C 2 /A 2 ) in the
Fig. 4.9 a Cyclic voltammograms and b the vs. E curves measured at a potential scan rate of
5 mV s −1 for the (111)-textured Au thin-film (with a thickness of 220 nm) electrode in 0.1 M H 2 SO 4
solutions with and without 10 −3 M CuSO 4 [19]. The solid and dotted curves represent the results
in the solutions with and without Cu 2+ , respectively. Reprinted from [19], Copyright 2007, with
permission from Springer Nature