通过石墨烯覆盖将纳米级粘合剂接触行为调节到接近理想的赫兹状态
Tuning nanoscale adhesive contact behavior to a near ideal Hertzian state via graphene coverage
摘要：
采用分子静力学（MS）模拟方法研究了Pt（111）表面在半径为5-20 nm的压头作用下的压痕过程。基底和压头表面是裸露的或石墨烯覆盖的。我们的模拟表明，可以显着减少的影响裸基板和压头针尖之间的粘附力的原子之间的粘附强度和粘附范围，或通过提高基板刚度。结果表明，在接触界面两侧涂覆石墨烯层后，基底的弹性响应表现出较弱的粘附力，这归因于石墨烯层之间的弱相互作用。基于裸衬底获得的这些原理，衬底的纳米级接触行为可以通过增加石墨烯层的数量、向衬底上的石墨烯施加预应变或使用大压头来调谐到接近理想的赫兹状态。我们的研究为AFM探针和MEMS/NEMS系统设计无粘附涂层提供了理论指导。
英文摘要：
We carry out molecular statics (MS) simulations to study the indentation process of Pt (111) surfaces using an indenter with the radius of 5-20 nm. The substrate and indenter surfaces are either bare or graphene-covered. Our simulations show that the influence of the adhesion between the bare substrate and indenter tip can be significantly reduced by decreasing the adhesion strength and adhesion range between the atoms on the substrate and indenter, or by enhancing the substrate stiffness. Our results suggest that the elastic response of the substrate exhibits weaker adhesion after the coating of graphene layers on either side of the contacting interface, which is attributed to the weak interaction between the graphene layers. Based on these principles obtained for the bare substrate, the nanoscale contact behavior of the substrate can be tuned into a near-ideal Hertzian state by increasing the number of graphene layers, applying pre-strains to graphene on substrate, or using large indenters. Our research provides theoretical guidance for designing adhesion-less coatings for AFM probes and MEMS/NEMS systems.
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