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O: Fachverband Oberflächenphysik

O 27: Tribology

O 27.5: Vortrag

Dienstag, 19. März 2024, 11:30–11:45, MA 144

Friction Force Microscopy of Graphene on a Platinum Surface — •Thilo Glatzel¹, Zhao Liu², Guilherme Vilhena³, Antoine Hinaut¹, Sebastian Scherb⁴, Enrico Gnecco⁵, and Ernst Meyer¹ — ¹University of Basel, Dep. of Physics, Klingelbergstr. 82, 4056 Basel, Switzerland — ²Nankai University, School of Materials Science and Engineering, 300350 Tianjin, China — ³Universidad Autónoma de Madrid, Dep. of Theoretical Condensed Matter Physics, 28049 Madrid, Spain — ⁴Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, Netherlands — ⁵M. Smoluchowksi Institute of Physics, Jagiellonian University in Krakow, 30-348 Krakow, Poland

Friction control and technological advancement are deeply connected. Two dimensional materials play a significant role in achieving near-frictionless contacts. However, there is a challenge in adjusting the sliding of superlubric materials. Taking inspiration from twistronics, we studied the control of superlubricity through moiré patterning. Through friction force microscopy and molecular dynamics simulations, we demonstrated that different twist angles of graphene moirés on a Pt(111) surface lead to a transition from superlubric to dissipative sliding regimes under various normal forces. This is due to a new mechanism at the superlattice level, where moiré tiles undergo a highly dissipative shear process connected to the twist angle beyond a critical load. Importantly, the atomic-level dissipation associated with moiré tile manipulation allows bridging different sliding regimes in a reversible manner, offering a way to subtly control superlubricity.

Keywords: Scanning Probe Microscopy; Friction; Graphene; Moiré; Superlubricity