Adsorption, Wetting, Growth, and Thermal Stability of the Protic Ionic Liquid Diethylmethylammonium Trifluoromethanesulfonate on Ag(111) and Au(111)

Massicot S, Sasaki T, Lexow M, Shin S, Maier F, Kuwabata S, Steinrück HP (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Langmuir American Chemical Society

Book Volume: 37

Pages Range: 11552-11560

Journal Issue: 39

DOI: 10.1021/acs.langmuir.1c01823

Abstract

We have studied the adsorption, wetting, growth, and thermal evolution of the protic IL diethylmethylammonium trifluoromethanesulfonate ([dema][TfO]) on Au(111) and Ag(111). Ultrathin films were deposited at room temperature (RT) and at 90 K, and were characterized in situ by angle-resolved X-ray photoelectron spectroscopy. For both surfaces, we observe that independent of temperature, initially, a closed 2D wetting layer forms. While the film thickness does not increase past this wetting layer at RT, at 200 K and below, "moderate"3D island growth occurs on top of the wetting layer. Upon heating, on Au(111), the [dema][TfO] multilayers desorb at 292 K, leaving an intact [dema][TfO] wetting layer, which desorbs intact at 348 K. The behavior on Ag(111) is much more complex. Upon heating [dema][TfO] deposited at 90 K, the [dema]+ cations deprotonate in two steps at 185 and 305 K, yielding H[TfO] and volatile [dema]0. At 355 K, the formed H[TfO] wetting layer partly desorbs (∼50%) and partly decomposes to form an F-containing surface species, which is stable up to 570 K.

Authors with CRIS profile

Stephen Massicot Lehrstuhl für Physikalische Chemie II Matthias Lexow Lehrstuhl für Physikalische Chemie II Sunghwan Shin Lehrstuhl für Physikalische Chemie II Florian Maier Lehrstuhl für Physikalische Chemie II Hans-Peter Steinrück Lehrstuhl für Physikalische Chemie II

Involved external institutions

Osaka University JP Japan (JP)

How to cite

APA:

Massicot, S., Sasaki, T., Lexow, M., Shin, S., Maier, F., Kuwabata, S., & Steinrück, H.-P. (2021). Adsorption, Wetting, Growth, and Thermal Stability of the Protic Ionic Liquid Diethylmethylammonium Trifluoromethanesulfonate on Ag(111) and Au(111). Langmuir, 37(39), 11552-11560. https://dx.doi.org/10.1021/acs.langmuir.1c01823

MLA:

Massicot, Stephen, et al. "Adsorption, Wetting, Growth, and Thermal Stability of the Protic Ionic Liquid Diethylmethylammonium Trifluoromethanesulfonate on Ag(111) and Au(111)." Langmuir 37.39 (2021): 11552-11560.

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