Enhancement of Friction by Water Intercalated between Graphene and Mica

Common experience shows that friction converts mechanical energy into heat. The first part of this process is vibrational excitation of atoms at the interface between rubbing bodies. The second part is the removal of the vibration energy by transferring it from the interface to the substrate. However, it is difficult to disentangle the excitation and energy transfer processes. We solved this by using a system consisting of a SiO2-terminated tip sliding over graphene deposited on mica with intercalated water between them. The intercalated water was found to increase friction by a factor of relative to dry mica. Density functional theory calculations show that water broadens the spectral range of graphene vibrations particularly the low-frequency flexural modes thus providing new excitation channels and also by increasing the overlap with the atomic vibrations of the mica substrate, which facilitates coupling and energy transfer.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-08
Language
English
Keywords

ATOMIC-FORCE MICROSCOPY; AUGMENTED-WAVE METHOD; AMBIENT CONDITIONS; FILMS; CONDENSATION; CALIBRATION; FREQUENCIES; SUBSTRATE; CARBON; MODE

Citation

JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.8, no.15, pp.3482 - 3487

ISSN
1948-7185
DOI
10.1021/acs.jpclett.7b01377
URI
http://hdl.handle.net/10203/225605
Appears in Collection
NT-Journal Papers(저널논문)EEW-Journal Papers(저널논문)
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