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抄録
Superlubriity is one of the most interesting physical phenomena and leads drastic reduction of friction by controlling atomic structures of the interface. While the basic theoretical concept was proposed more than three decades ago, it remained challenging to observe the low-friction phenomena. Recent development of on-surface synthesis allows us to obtain nanocarbon materials whose structures can be atomically defined by employed precursor molecules. Here, we synthesized polyfluorne and graphene nanoribbon as sliding objects on atomically clean gold surfaces. We pulled the single fluorene oligomer 10–100 nm long from Au(111) with a tip of low-temperature atomic force microscopey. A combination of atomic force microscopy and calculations based on an extended Frenkel-Kontorova model revealed significant reduction of friction due to the incommensurability to the substrate. In the case of graphene nanoribbon, we found that the high stiffness keeps the incommensurability so that the superlubricity was observed.

Description:

Superlubriity is one of the most interesting physical phenomena and leads drastic reduction of friction by controlling atomic structures of the interface. While the basic theoretical concept was proposed more than three decades ago, it remained challenging to observe the low-friction phenomena. Recent development of on-surface synthesis allows us to obtain nanocarbon materials whose structures can be atomically defined by employed precursor molecules. Here, we synthesized polyfluorne and graphene nanoribbon as sliding objects on atomically clean gold surfaces. We pulled the single fluorene oligomer 10-100 nm long from Au(111) with a tip of low-temperature atomic force microscope. A combination of atomic force microscopy and calculations based on an extended Frenkel-Kontorova model revealed significant reduction of friction due to the incommensurability to the substrate. In the case of graphene, we found that the high stiffness keeps the incommensurability so that the superlubricity was observed.

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  ©日本表面真空学会

Keyword: Superlubricity, atomic force microscopy, on-surface synthesis, graphene nanoribbon, low temperature

Date published: 2024-06-10

Publisher: 公益社団法人 日本表面真空学会

Journal:

• 表面と真空 (ISSN: 24335835) vol. 67 issue. 6 p. 267-271

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4554

First published URL: https://doi.org/10.1380/vss.67.267

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Updated at: 2024-06-26 12:30:09 +0900

Published on MDR: 2024-06-26 12:30:09 +0900