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Investigation of BMI-PF6 Ionic Liquid/Graphite Interface Using Frequency Modulation Atomic Force Microscopy

Published online by Cambridge University Press:  04 June 2018

Harshal P. Mungse*
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto606-8501, Japan
Takashi Ichii
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto606-8501, Japan
Toru Utsunomiya
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto606-8501, Japan
Hiroyuki Sugimura
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Kyoto606-8501, Japan

Abstract

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Structural analysis on interfaces between ionic liquids (ILs) and solid substrates is an important study for not only the basic fundamental aspects but also many technological processes. In the present work, we utilized frequency modulation atomic force microscopy (FM-AFM) based on a quartz tuning fork sensor to elucidate the structure of interface between 1-butyl-3-methylimidazolium hexafluorophosphate (BMI-PF6) IL and highly ordered pyrolytic graphite (HOPG) surface. It was observed that this IL form solvation layers at their interface, with ∼0.5-0.57 nm thickness of each layer. We have compared our experimental results with previously reported results from molecular dynamics simulation study, and combination of classical molecular dynamics and density functional theory calculations in order to understand the IL/HOPG interface.

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Articles
Copyright
Copyright © Materials Research Society 2018