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Feng, Haochen; Cheng, Ziwen; Yang, Tingting; Lu, Zhibin; He, Q.-C.
Applied surface science, 12/2023, Letnik: 640Journal Article
In this research, the authors investigated a new material called honeycomb borene (HB), which exhibits an attraction-induced superlubricity (AISL) phenomenon and shows potential for experimental exploration of the load-induced superlubricity phenomenon. AISL is dominated by Coulomb interactions between the tip (AFM) and HB surfaces, which are caused by load-tuned electron redistribution. By comparing the sliding behaviors of various tips on HB surface supported by a metal substrate, it is found that the sliding of Ag tip on HB/Ti (0001) surface is the best choice for AISL experimental verification. Subsequently, the feasibility of AISL experiment was demonstrated in detail by analyzing the binding of substrate to HB plate and the adsorption between HB surface and tip. The results of this study provide new insights for experimental exploration and may help push the progress of load-induced superlubricity from theory to experiment. Display omitted •The friction force of a silver tip slides on a honeycomb borophene monolayer is found to vary nonlinearly with the tip height.•The friction force turns out to be almost null when the tip height approaches a value corresponding to a critical normal attraction force.•The experimental feasibility of the attraction-induced superlubricity (AISL) is argued by analyzing the different relevant factors. A nanoscale friction test using an atomic force microscope (AFM) is modelled as a diatomic tip in sliding contact with a 2D monolayer supported by a metal substrate. This test is simulated by ab initio DFT calculations. The simulation results show that, when a silver tip slides on a honeycomb borophene (HB) monolayer supported by a titanium substrate, the friction force varies nonlinearly with the prescribed height of the tip or, equivalently, the corresponding normal force exerted by the tip on the HB monolayer. In particular, the friction force turns out to be almost null when the height of the tip sufficiently approaches a critical height of the prescribed height, which corresponds to a critical normal attraction force. This nanoscale friction-free sliding phenomenon is thus qualified as attraction-induced superlubricity (AISL). Further, the origin of AISL is discussed and analyzed in terms of electron redistributions. Finally, the feasibility of AISL detection is argued by analyzing the potential energy surface (PES), the adsorption strength of the tip on HB surface and the binding strength of HB to its substrate.
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