Molecular Layering of Fluorinated Ionic Liquids at a Charged Sapphire (0001) Surface-Reference-Cited by-同舟云学术

Molecular Layering of Fluorinated Ionic Liquids at a Charged Sapphire (0001) Surface

Published:2008-10-17 Issue:5900 Volume:322 Page:424-428
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Mezger Markus¹²³⁴⁵,Schröder Heiko¹²³⁴⁵,Reichert Harald¹²³⁴⁵,Schramm Sebastian¹²³⁴⁵,Okasinski John S.¹²³⁴⁵,Schöder Sebastian¹²³⁴⁵,Honkimäki Veijo¹²³⁴⁵,Deutsch Moshe¹²³⁴⁵,Ocko Benjamin M.¹²³⁴⁵,Ralston John¹²³⁴⁵,Rohwerder Michael¹²³⁴⁵,Stratmann Martin¹²³⁴⁵,Dosch Helmut¹²³⁴⁵

Affiliation:

1. Max-Planck-Institut für Metallforschung, D-70569 Stuttgart, Germany.

2. European Synchrotron Radiation Facility, F-38043 Grenoble, France.

3. Physics Department and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel.

4. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA.

5. Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5095, Australia.

Abstract

Room-temperature ionic liquids (RTILs) are promising candidates for a broad range of “green” applications, for which their interaction with solid surfaces plays a crucial role. In this high-energy x-ray reflectivity study, the temperature-dependent structures of three ionic liquids with the tris(pentafluoroethyl)trifluorophosphate anion in contact with a charged sapphire substrate were investigated with submolecular resolution. All three RTILs show strong interfacial layering, starting with a cation layer at the substrate and decaying exponentially into the bulk liquid. The observed decay length and layering period point to an interfacial ordering mechanism, akin to the charge inversion effect, which is suggested to originate from strong correlations between the unscreened ions. The observed layering is expected to be a generic feature of RTILs at charged interfaces.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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