Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 27: Tribology

O 27.4: Talk

Tuesday, March 19, 2024, 11:15–11:30, MA 144

Tribological properties of 2D materials — •Oscar Javier Gutiérrez Varela and José Guilherme Vilhena Albuquerque D Orey — Departamento de Física Teórica de la Materia Condensada, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, España

2D materials are pivotal in diverse technological areas, necessitating a thorough examination of their physical properties in order to guarantee practical applications and to gain insights into their exhibited intriguing phenomena. We delved into the tribological properties of 2D materials, specifically graphene and MoS2. Using fully atomistic Molecular Dynamics (MD) simulations to mimic Friction Force Microscopy (FFM) experiments, we examine different tribological properties. Scenarios include suspended and substrate placements of monolayers or multiple layers, with analyses of pristine and defective 2D material presentations to discern different types of vacancies through FFM. We also explore various scanning directions and the impact of thermophoresis. Preliminary results confirm known characteristics, such as higher frictional forces in suspended graphene than on a substrate. Variations in lateral force patterns are observed in MoS2 with vacancies, hinting at the potential to distinguish defects using FFM. Additionally, scanning graphene and MoS2 against the direction of thermal flow increased hysteresis and lateral force, associated with higher friction. This comprehensive analysis allows for comparisons with experimental groups, contributing to a deeper understanding of the tribological properties of 2D materials.

Keywords: 2D materials; Nanotribology; Molecular Dynamics; Thermophoresis