Tribo-Induced Interfacial Material Transfer of an Atomic Force Microscopy Probe Assisting Superlubricity in a WS2/Graphene Heterojunction.
Jisen TianXuan YinJinjin LiWei QiPeng HuangXinchun ChenJianbin LuoPublished in: ACS applied materials & interfaces (2020)
Robust superlubricity of 2D materials could be obtained by transferring graphene on the tip surface for the formation of interlayer friction of heterojunction, owing to the availability of stable interfacial incommensurate contact. Nevertheless, the material transfer mechanisms assisting superlubricity via atomic force microscopy (AFM) probe are still hardly comprehended. In this work, we reported a superlow friction coefficient (0.003) of the WS2/graphene heterojunction governed by graphene flake-transferred AFM tips and achieved a superlubricity state of velocity independence. Both low adhesion of the heterojunction and excellent wear-resistance for tip were also observed, which were attributed to the extremely low interface interaction during the incommensurate contact. The in-depth investigation on the frictional contact zones of probes was performed through high-resolution transmission electron microscopy. The observations emphasize the prevailing mechanisms of tribo-induced interfacial material transfer when AFM probes scan on the surface of 2D materials. The evolution of the superlubricity state principally depends on the establishment of interfacial nanostructures in the self-adaptive running-in period, by different contact mechanics and tribo-reconstructing pathways. These results stimulate a technical route to develop superlubricious tribopairs of 2D materials and guide a promising perspective in the engineering system.
Keyphrases
- atomic force microscopy
- perovskite solar cells
- single molecule
- high speed
- living cells
- electron transfer
- solar cells
- high resolution
- ionic liquid
- room temperature
- high glucose
- carbon nanotubes
- diabetic rats
- molecular dynamics simulations
- electron microscopy
- walled carbon nanotubes
- small molecule
- computed tomography
- visible light
- endothelial cells
- quantum dots
- drug induced
- magnetic resonance imaging
- fluorescent probe
- oxidative stress
- magnetic resonance
- fluorescence imaging
- biofilm formation
- pseudomonas aeruginosa
- staphylococcus aureus
- optical coherence tomography
- escherichia coli
- high intensity
- blood flow