Structural study of UPD Bi/Au(111) electrode surface in ionic liquid using in-situ surface X-ray scattering

Seno, Ryu; Tamura, Kazuhisa   ; Nishihata, Yasuo; Mizuki, Junichiro; Sakaue, Kiyoshi*

The electrodeposited Bi/Au(111) surface structure in 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([BMIM]TFSA) was investigated using surface X-ray scattering (SXS). The X-ray reflectivity analysis showed that the distance between the electrodeposited Bi layer and the most outer Au surface layer was 2.47 and it agreed that Bi atoms deposited on the threefold hollow site of Au(111) surface. Further, the distance between the electrodeposited Bi layers was 2.51 and it also agreed that Bi atoms deposited on the threefold hollow site of the Bi layer. The amount of electrodeposited Bi on Au(111) surface was 0.85 monolayer; thus, it was suggested that the electrodeposited Bi formed epitaxial layer on Au(111) surface in [BMIM]TFSA.