Identification of Carbon Allotropes in Tribolayers Obtained by Rubbing of Graphite

The carbon trobolayer (CTL) is a spontaneously developed structure within the boundary layer between friction bodies of graphite bulk and the substrate. It exhibits properties fundamentally different from those of bulk graphite. Due to high in-plane hardness of sp2 bonds in nanoscale thick graphitic...

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Bibliographic Details
Main Authors: Mailian, Aram, Panosyan, Zhozef, Yengibaryan, Yeremia, Mailian, Manuel
Format: Conference Proceeding
Language:English
Subjects:
Carbon layer
graphene
Raman spectroscopy
tribology
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Summary:The carbon trobolayer (CTL) is a spontaneously developed structure within the boundary layer between friction bodies of graphite bulk and the substrate. It exhibits properties fundamentally different from those of bulk graphite. Due to high in-plane hardness of sp2 bonds in nanoscale thick graphitic flakes, the action of friction causes drastic structural and morphological transformations throughout multiple cycles of rubbing. The resultant self-organized carbon tribolayer (CTL) contains vast areas of light transparent carbon allotrope. The optical absorption spectrum of CTL exposes a resonance in ultraviolet (distinguished peak at 4.8 eV). The sharp peak refers to excitonic transitions and is assumed to be a fingerprint of nanostructured sp2 phase. The peak fades out with step-by-step removal of topmost layers of CTL, whereas the absorption above ∼5eV progressively dominates the optical absorption spectrum. Observed features testify that the CTL is morphologically anisotropic through the layer thickness; sp2 phase of turbostratic bi-layer grapheme is formed at the top, and thicker sp3 allotrope sub-layer is formed beneath it.
ISSN:2214-7853
2214-7853
DOI:10.1016/j.matpr.2017.07.012