论文标题
通过石墨烯覆盖范围，将纳米级粘附接触行为调整到接近理想的赫兹州
Tuning nanoscale adhesive contact behavior to a near ideal Hertzian state via graphene coverage
论文作者
论文摘要
我们进行分子静态（MS）模拟，以使用半径为5-20 nm的凹痕研究PT（111）表面的凹痕过程。底物和凹痕表面是裸露的或石墨烯覆盖的。我们的模拟表明，通过降低基板和凹痕物质上原子之间的粘附强度和粘附范围，或通过增强底物刚度，可以显着降低裸子底物和凹痕尖端之间的粘附的影响。我们的结果表明，底物的弹性响应在接触界面两侧的石墨烯层涂层后表现出较弱的粘附，这归因于石墨烯层之间的弱相互作用。基于这些裸子基板获得的这些原理，可以通过增加石墨烯层的数量，将固定剂的数量调整为近乎理想的Hertzian状态，从而将固定材料涂在基板上，或使用大型凹痕器。我们的研究提供了为AFM探针和MEMS/NEMS系统设计无粘附涂层的理论指南。
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.
