Journal
CARBON
Volume 87, Issue -, Pages 374-384Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.01.053
Keywords
-
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) through a Strategic Network (CANRIMT) Grant
Ask authors/readers for more resources
The sliding friction of multilayered graphene was examined by conducting pin-on-disk tests in ambient air with different relative humidity (RH) levels (10-45% RH) and in dry N-2 (0% RH) where a high coefficient of friction (COP) of 0.52 was measured. Tests carried out at 10% RH showed a low steady state COP of 0.17. Progressively lower friction values were observed when the RH of the atmosphere was increased, with the lowest COF of 0.11 reached at 45% RH. Micro-Raman analyses of sliding surfaces of graphene transfer layers formed on the Ti-6Al-4V counterfaces showed an increase in the intensity of D-band with an increase in the RH suggesting defect formations in the C-network as a result of sp(2) to sp(3) transformation and amorphization during sliding. The H and OH passivation of graphene, as indicated by X-ray photoelectron spectra (XPS) of the contact surfaces, was a possible reason for low friction of graphene in humid atmospheres. Transfer layers incorporated stringers of graphene stacks with d-spacings of 0.34-0.38 nm, which were larger than that of pristine graphite suggesting that repulsion between the adsorbed molecules caused an increase in the lattice spacing. (C) 2015 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available