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题名: In Situ Video-STM Study of Adlayer Structure and Surface Dynamics at the Ionic Liquid/Au (111) Interface
作者: Wen, Rui1, 2; Rahn, Bjorn1; Magnussen, Olaf. M.1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2016-07-28
卷: 120, 期:29, 页:15765-15771
收录类别: SCI
英文摘要: The molecular arrangement and surface dynamics of Au (111) electrodes in 1-hexyl-3-methylimidazolium chloride ([HMIm][Cl]) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIm][TFSA]) were investigated by in situ high-speed scanning tunneling microscopy (video-STM). These measurements provide direct insights into the potential-dependent adlayer structure of adsorbed [HMIm](+) cations and Cl- anions on the Au (111) surface. At low electrode charge densities highly dynamic structures with only local order are observed. After changing the potential in the negative direction, stripe-like adlayers structures are observed, which are attributed to [HMIm](+) in a planar adsorption geometry. These can be described by simple commensurate (root 3 x 3) and a (root 3 x root 13) structures in the presence of Cl- and [TFSA](-) counterions, respectively, indicating that the in-plane arrangement of the cations is affected by epitaxial effects and coadsorbed anions. Upon a further decrease in potential, a transition to a more close-packed (root 3 x 2) adlayer phase is observed in [HMIm][TFSA], in which the cations are partly oriented away from the metal surface.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35218
Appears in Collections:其它_期刊论文

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作者单位: 1.Univ Kiel, Inst Expt & Appl Phys, D-24098 Kiel, Germany
2.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
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