@article{GONGYANG2020, 
author = {Yujie GONGYANG and Wengen OUYANG and Cangyu QU and Michael URBAKH and Baogang QUAN and Ming MA and Quanshui ZHENG},
title = {Temperature and velocity dependent friction of a microscale graphite-DLC heterostructure},
year = {2020},
journal = {Friction},
volume = {8},
number = {2},
pages = {462-470},
keywords = {friction, graphite, irradiation, diamond like carbon, desorption},
url = {https://www.sciopen.com/article/10.1007/s40544-019-0288-0},
doi = {10.1007/s40544-019-0288-0},
abstract = {One of the promising approaches to achieving large scale superlubricity is the use of junctions between existing ultra-flat surface together with superlubric graphite mesas. Here we studied the frictional properties of microscale graphite mesa sliding on the diamond-like carbon, a commercially available material with a ultra-flat surface. The interface is composed of a single crystalline graphene and a diamond-like carbon surface with roughness less than 1 nm. Using an integrated approach, which includes Argon plasma irradiation of diamond-like carbon surfaces, X-ray photoelectron spectroscopy analysis and Langmuir adsorption modeling, we found that while the velocity dependence of friction follows a thermally activated sliding mechanism, its temperature dependence is due to the desorption of chemical groups upon heating. These observations indicate that the edges have a significant contribution to the friction. Our results highlight potential factors affecting this type of emerging friction junctions and provide a novel approach for tuning their friction properties through ion irradiation.}
}