2020/11/02 by Yongchao Chen, Chen, Yongchao, Zhizi Guan +5
Materials Science · Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Force Microscopy Techniques and Applications #Graphene research and applications #Surface and Thin Film Phenomena #physics.app-ph
paper · pdf · doi:10.48550/arxiv.2011.00705
28 pages, 6 figures, Journal paper under review
openalex publication_date 2020/11/02 · arxiv created 2021/03/04 · arxiv updated 2021/03/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.