Fate of methanol molecule sandwiched between hydrogen-terminated diamond-like carbon films by tribochemical reactions: Tight-binding quantum chemical molecular dynamics study

Kentaro Hayashi, Seiichiro Sato, Shandan Bai, Yuji Higuchi, Nobuki Ozawa, Tomomi Shimazaki, Koshi Adachi, Jean Michel Martin, Momoji Kubo

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Recently, much attention has been given to diamond-like carbon (DLC) as a solid-state lubricant, because it exhibits high resistance to wear, low friction and low abrasion. Experimentally it is reported that gas environments are very important for improving the tribological characteristics of DLC films. Recently one of the authors in the present paper, J.-M. Martin, experimentally observed that the low friction of DLC films is realized under alcohol environments. In the present paper, we aim to clarify the low-friction mechanism of the DLC films under methanol environments by using our tight-binding quantum chemical molecular dynamics method. We constructed the simulation model in which one methanol molecule is sandwiched between two hydrogen-terminated DLC films. Then, we performed sliding simulations of the DLC films. We observed the chemical reaction of the methanol molecule under sliding conditions. The methanol molecule decomposed and then OH-termination of the DLC was realized and the CH 3 species was incorporated into the DLC film. We already reported that the OH-terminated DLC film is very effective to achieve good low-friction properties under high pressure conditions, compared to H-terminated DLC films. Here, we suggest that methanol environments are very effective to realize the OH-termination of DLC films which leads to the good low-friction properties.

Original languageEnglish
Pages (from-to)137-146
Number of pages10
JournalFaraday Discussions
Volume156
DOIs
Publication statusPublished - 2012 Jul 16

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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