The interfaces of Au(111) and Au(100) in a hexaalkyl-substituted guanidinium ionic liquid: An electrochemical and in situ STM study

Markus Gnahm, Claudia Berger, Maria Arkhipova, Helene Kunkel, Tamás Pajkossy, Gerhard Maas, Dieter M. Kolb

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Five hexaalkylguanidinium-based ionic liquids have been synthesised, and based on their cyclic voltammograms the most suited one, N,N-dibutyl-N′, N′-diethyl-N′′,N′′-dimethylguanidinium bis(trifluoromethylsulfonyl)imide, has been chosen for electrochemical studies. The surface interaction of this room-temperature ionic liquid with single crystalline gold surfaces (Au(100) and Au(111)) has been investigated using cyclic voltammetry, impedance spectroscopy and in situ scanning tunnelling microscopy (STM). The interfacial capacitance was found to be very low; STM measurements revealed the hex-reconstruction and herringbone reconstruction for Au(100) and for Au(111), respectively, at negative potentials; that is, at these potentials no hints for ad-structures of the cation could be found.

Original languageEnglish
Pages (from-to)10647-10652
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number30
DOIs
Publication statusPublished - Aug 14 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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