Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/808070

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Title
AFM and STM studies on the surface interaction of (BMP)TFSA and (EMIm)TFSA ionic liquids with Au(111)
Author/Creator
Atkin, Rob;  El Abedin, Sherif Zein;  Hayes, Robert;  Gasparotto, Luiz H. S.;  Borisenko, Natalia;  Endres, Frank
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Sciences
Description
The surface interaction of two air- and water-stable ionic liquids (ILs), 1-ethyl-3-methylimidazolium bis[(trifluoromethylsulfonyl]amide ([EMIm]TFSA) and 1-butyl-1-methylpyrrolidinium bis[(trifluoromethyl)sulfonyl]amide ([BMP]TFSA), with Au(111) has been investigated using atomic force microscopy (AFM), cyclic voltammetry, and scanning tunneling microscopy (STM) measurements. AFM experiments reveal that multiple solvation layers are present at the gold interface for both ILs and that the strength of the interaction between the innermost layer and the substrate is dependent on the cation type; the force required to rupture the innermost solvation layer is greater for [BMP]TFSA than for [EMIm]TFSA, attributed to stronger cation surface interactions. In situ STM elucidates the influence of IL species on restructuring of the Au(111) interface. In the presence of [BMP]TFSA, the Au(111) surface restructures to produce a wormlike pattern, but this unusual morphology is not observed for the [EMIm]TFSA−Au(111) system. This remarkable difference in electrochemical behavior is ascribed to the greater strength of the interaction of [BMP]⁺ compared to [EMIm]⁺ with the Au(111) surface. These results demonstrate that such interfacial effects have to be considered for all electrochemical reactions and provide insight into the electrical double-layer structure in IL systems.
Relation
Journal of Physical Chemistry C Vol. 113, Issue 30, p. 13266-13272
Publisher Link
http://dx.doi.org/10.1021/jp9026755
Date
2009
Publisher
American Chemical Society
Keyword(s)
suface interactions;  ionic liquids;  scanning tunneling microscopy;  atomic force microscopy
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/808070
Identifier
ISSN:1932-7447
Reviewed
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Subject
"Journal of Physical Chemistry C"
 
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