2016/03/11 by M.R. Mailian, Manuel Mailian, Mailian, Manuel +2
Chemistry · Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Chemical physics #Chemistry #Composite material #Crystallography #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Graphene research and applications #Graphite #Materials Science (cond-mat.mtrl-sci) #Materials science #Molecular physics #Optics #Phase (matter) #Physics #Raman spectroscopy #Rubbing #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1603.03716
published in arXiv (Cornell University) (Cornell University) · 4 figures
arxiv created 2016/03/11 · openalex publication_date 2016/03/11 · arxiv updated 2016/03/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The simplest way to obtain thin carbon layers is to draw or rub with a graphite rod. During rubbing, forces of friction acting in graphite/substrate tribological system cause drastic changes in the structure of the interface stratum developing thereby stable self-organized and ordered thin structure. We present a pioneering experimental investigation of structural and morphological transformations in carbon tribolayers (CTL). By optical microscopy observation it is found that CTL is a multilayer structure, the essential building block of which is a transparent phase shaped as a lamina in-between the surface and bottom disordered layers of CTL. The surface of the lamina exhibits non-linear electrical conductivity near zero bias on I-V characteristics. The optical properties of the whole CTL are mostly controlled by physical processes occurring in the transparent lamina. The Raman spectrum of CTL contains narrow bands at 1,589 cm-1 and 1,346 cm-1 corresponding to G and D bands of carbon crystal lattice. The observed features are interpreted using the relationship between the bond length and corresponding band frequency, r2ω= const. Optical absorption of CTL has a feature at 4.6 eV originating from strong electron-hole interaction. From comparative analysis of experimental data, structural-spectral correspondence is found. It is concluded that because of phase transformation during rubbing, a carbon structure consisting of sp3 lamina with a nano-scaled thick sp2 layer on the top is shaped.