info:eu-repo/semantics/article
New insights into the Sn underpotential deposition on Au(100)
Fecha
2012-01Registro en:
Meier, Lorena Alejandra; Garcia, Silvana Graciela; Salinas, Daniel Ricardo; New insights into the Sn underpotential deposition on Au(100); John Wiley & Sons Ltd; Surface and Interface Analysis; 44; 1; 1-2012; 37-40
0142-2421
CONICET Digital
CONICET
Autor
Meier, Lorena Alejandra
Garcia, Silvana Graciela
Salinas, Daniel Ricardo
Resumen
The underpotential deposition (UPD) of Sn in the system Au(100)/Sn2+, SO42− has been studied by classical electrochemical techniques and in situ scanning tunneling microscopy. The results show that the Sn UPD initiates at relatively high potentials with the formation of a quasi‐hexagonal structure characterized as Au(100) − (√2 × 7)R45°. This expanded overlayer contributes to the modification of the surface morphology which exhibits flat terraces with step edges showing angles of 60 or 120°. At lower potentials two‐dimensional (2D) islands are formed which tend to grow, causing a coverage increase. In the underpotential region close to the formation of the 3D bulk phase the long time polarization experiments indicate the formation of different Au–Sn alloy phases.