Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 120: Tribology: Surfaces and nanostructures

O 120.6: Vortrag

Freitag, 16. März 2018, 12:45–13:00, MA 144

Friction at the Au/graphene interface: A density functional theory investigation — •Duygu Gizem Şentürk¹, Daniele Toffoli², and Hande Toffoli¹ — ¹Department of Physics, Middle East Technical University, 06800, Ankara, Turkey — ²Dipartimento di Scienze Chimiche e Farmaceutiche, Universita degli Studi di Trieste, Via L. Giorgieri 1, I-34127, Trieste, Italy

As the confines of materials science extend to the nanoscale, the tribological behavior of materials diverges significantly from their macroscale counterparts as the classical Amontons-Coulomb laws no longer apply to interfaces since the quantum mechanical nature of the materials dominates. It is then of great importance to develop a new picture of friction at this scale, especially due to its increasing industrial importance. Friction Force Microscopy(FFM), has opened new frontiers in the study of these challenging interfaces. In particular, metal-coated tips have been used in FFM experiments to uncover the fascinating behavior of two-dimensional systems such as graphene, h-BN and MoS2. In this work, for the first time to the best of our knowledge, we will present a detailed density functional theory investigation of the direction-dependent friction forces that arise as a result of relative motion at the interface between graphene and low-index surfaces of Au. We will highlight the differences in the behavior of the (100), (110) and (111) surfaces and detail the results of our attempts to understand the source of these differences.This work is funded by The Scientific and Technological Research Council of Turkey (TUBITAK) within the 1001 program, Grant No: 115F493.