2018/01/09 by Lorenzo Gigli, Nicola Manini, Gigli, Lorenzo +7
Engineering · Physics and Astronomy · #Adhesion, Friction, and Surface Interactions #FOS: Physical sciences #Force Microscopy Techniques and Applications #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
paper · pdf · doi:10.48550/arxiv.1801.03131
openalex publication_date 2018/01/09 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
Graphene nanoribbons (GNRs) physisorbed on a Au(111) surface can be picked\nup, lifted at one end, and made slide by means of the tip of an atomic-force\nmicroscope. The dynamical transition from smooth sliding to multiple stick-slip\nregimes, the pushing/pulling force asymmetry, the presence of pinning, and its\norigin are real frictional processes in a nutshell, in need of a theoretical\ndescription. To this purpose, we conduct classical simulations of frictional\nmanipulations for GNRs up to 30 nm in length, one end of which is pushed or\npulled horizontally while held at different heights above the Au surface. These\nsimulations allow us to clarify theoretically the emergence of stick-slip\noriginating from the short 1D edges rather than the 2D "bulk", the role of\nadhesion, of lifting, and of graphene bending elasticity in determining the GNR\nsliding friction. The understanding obtained in this simple context is of\nadditional value for more general cases.\n