Adsorption, Desorption, and Reaction of 1-Octyl-3-methylimidazolium Tetrafluoroborate, [C₈C₁Im][BF₄], Ionic Liquid Multilayers on Cu(111)

Langmuir : the ACS Journal of Surfaces and Colloids
Karen L Syres, Robert G Jones

Abstract

Multilayers of 1-octyl-3-methylimidazolium tetrafluoroborate [C8C1Im][BF4] have been deposited on a Cu(111) surface by evaporation in UHV. XPS shows that [C8C1Im][BF4] adsorbs without decomposition for substrate temperatures < 300 K. XPS and UPS data indicate that ionic liquid (IL) deposition onto a 120 K Cu(111) surface results in the IL forming multilayers by a simultaneous-multilayer growth process. IL deposition onto a room temperature Cu(111) surface results in a different arrangement where at a coverage of one monolayer the IL forms droplets of about 100 Å height covering only about 1/10th of the surface. Multilayers deposited at 120 K convert to the room temperature arrangement upon heating. Further heating above room temperature causes the IL multilayer droplets to desorb leaving an IL monolayer of ≈6 Å thickness at ≈430 K. At higher temperatures, this monolayer reacts with the surface and BF3 is emitted, leaving products containing C, N, and some F on the surface. We propose a surface reaction where [BF4](-) ions react to form chemisorbed fluorine (Cu-F) and gaseous BF3, with the remaining [C8C1Im](+) decomposing on the Cu(111) in an unidentified manner.

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Citations

Dec 30, 2015·The Journal of Physical Chemistry Letters·Florian BuchnerR Jürgen Behm
Mar 11, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Eitan ElfassyMoshe Deutsch
Jul 28, 2016·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Michael WagstaffeAndrew G Thomas
May 10, 2017·The Journal of Chemical Physics·F MaierH-P Steinrück
Feb 10, 2017·The Journal of Chemical Physics·Aleksandra B BiedronSylvie Rangan
Aug 19, 2020·The Journal of Physical Chemistry. B·Sylvie RanganRobert A Bartynski
Apr 16, 2020·Chemical Reviews·Yong-Lei WangMichael D Fayer
Sep 22, 2021·Physical Chemistry Chemical Physics : PCCP·Jake M SeymourKevin R J Lovelock
Oct 2, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Manuel MeuselHans-Peter Steinrück

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