关键词: 非离子型氟表面活性剂, FSN, 自组装, Au(111), Au(100), 扫描隧道显微术

Abstract: The electrochemical behaviors of nonionic fluorosurfactant Zonyl FSN self-assembled monolayers on Au(111) and Au(100) were investigated by electrochemical scanning tunneling microscopy and cyclic voltammetry.In the potential range where the redox reaction of FSN molecules doesn′t occur,the structures of FSN self-assembled monolayers are uniform,which may suppress the adsorption of sulfate and the surface reconstruction of Au single crystal.At the initial stage of the oxidation of Au(111) and Au(100) surfaces covered by FSN self-assembled monolayers,Au(111) surface is characteristic of some protuberance,while Au(100) surface is characteristic of the movement of steps,however the structures of FSN self-assembled monolayers keep unchanged.Compared with Au(100),FSN self-assembled monolayers formed on Au(111) surface can suppress the oxidation of Au surface more efficiently.

Key words: nonionic fluorosurfactant, FSN, self-assembled monolayers, Au(111), Au(100), ECSTM