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Issue 5, 2016
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Ordered ionic liquid structure observed at terraced graphite interfaces

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Abstract

Reflection high-energy electron diffraction is presented as a contactless, surface-specific method to probe the ion organization and layering at the ionic liquid–solid interfaces. Three regimes can be identified for the structure of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][Tf2N]) on highly oriented pyrolytic graphite, which is strongly dependent on the distances of ions from the surface. Direct observations showed that the ultrathin ionic liquid (IL) assembly can exhibit bulk-like phase-transition behaviours as a result of the structural matching between the IL and graphite layers and the confinement template effect due to the surface topography of graphite. The present study illustrates the opportunities for conducting further studies of the structures and ultrafast dynamics of IL–solid interfaces.

Graphical abstract: Ordered ionic liquid structure observed at terraced graphite interfaces

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Publication details

The article was received on 08 Dec 2015, accepted on 29 Dec 2015 and first published on 07 Jan 2016


Article type: Communication
DOI: 10.1039/C5CP07575K
Citation: Phys. Chem. Chem. Phys., 2016,18, 3392-3396
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    Ordered ionic liquid structure observed at terraced graphite interfaces

    X. He, C. Wu, K. Rajagopal, N. Punpongjareorn and D. Yang, Phys. Chem. Chem. Phys., 2016, 18, 3392
    DOI: 10.1039/C5CP07575K

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