In Situ Video-STM Study of Adlayer Structure and Surface Dynamics at the Ionic Liquid/Au (111) Interface
| Autor: | Rui Wen, Björn Rahn, Olaf M. Magnussen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Inorganic chemistry
02 engineering and technology 010402 general chemistry Epitaxy 01 natural sciences Chloride law.invention chemistry.chemical_compound Adsorption law medicine Physical and Theoretical Chemistry Imide chemistry.chemical_classification 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystallography General Energy chemistry Electrode Ionic liquid Counterion Scanning tunneling microscope 0210 nano-technology medicine.drug |
| Zdroj: | The Journal of Physical Chemistry C. 120:15765-15771 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | 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 (√3 × 3) and a (√3 × √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... |
| Databáze: | OpenAIRE |
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