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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
AFM and STM studies on the surface interaction of [BMP]TFSA and [EMIm]TFSA ionic liquids with Au(111)
Journal of Physical Chemistry C, Volume 113, No. 30, Year 2009
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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. © 2009 American Chemical Sociey.
Authors & Co-Authors
Atkin, Rob
Australia, Callaghan
The University of Newcastle, Australia
Zein El Abedin, Sherif
Germany, Clausthal-zellerfeld
Technische Universität Clausthal
Egypt, Giza
National Research Centre
Hayes, Robert
Australia, Callaghan
The University of Newcastle, Australia
Gasparotto, Luiz H.S.
Germany, Clausthal-zellerfeld
Technische Universität Clausthal
Borisenko, Natalia
Germany, Clausthal-zellerfeld
Technische Universität Clausthal
Endres, Frank
Germany, Clausthal-zellerfeld
Technische Universität Clausthal
Statistics
Citations: 289
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1021/jp9026755
ISSN:
19327447
e-ISSN:
19327455
Research Areas
Environmental