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Eliminating delamination of graphite sliding on diamond-like carbon
- Gongyang, Yujie, Qu, Cangyu, Zhang, Shoumo, Ma, Ming, Zheng, Quanshui
- Carbon 2018 v.132 pp. 444-450
- X-ray photoelectron spectroscopy, annealing, delamination, desorption, friction, graphene, mathematical models, quantitative analysis
- Delamination is one of the major issues which cause the failure of two-dimensional layered-material based superlubric friction pairs. Using graphite mesas with single crystalline surfaces sliding on a diamond-like carbon film as an example, here we show experimentally that the delamination of graphite can be eliminated after proper annealing. With a combined approach of careful X-ray photoelectron spectroscopy analysis, force measurement and quantitative theoretical estimation, we find the variation in the chemical states of graphite edges and the desorption of water accounts for the absence of delamination. Our result provides a new concept for tuning the frictional properties of superlubric graphite mesas and the design of delamination-free layered-material based friction pairs.