Mr. Rotem Yaniv, M.Sc. Candidate
Faculty of Materials Science and Engineering
Technion – Israel Institute of Technology Haifa 3200003, Israel
Noncommensurate 2D interfaces hold great promise toward low friction and nanoelectromechanical applications. For identical constituents, the crystals interlock at specific rotational configurations leading to high barriers for slide. In contrast, nonidentical constituents comprising different lattice parameters should enable robust superlubricity for all rotational configurations. This is however not the case for gold–graphite interfaces, as both theory and experiments show scaling behavior of the sliding force as a function of the interface contact area. By simulating the sliding force for gold–graphite interfaces, our study shows that the origin for high force barriers at special angular configurations is a result of commensurability between the moiré structure and the contact geometry. Consequently, we suggest new geometries that can potentially overcome such commensurability effects to enable robust superlubricity.
R. Yaniv, E. Koren, Advanced Functional Materials, 2019, 1901138.