Friction of MoO₃ Nanoflakes on Graphite Surface with an Ace-like Intercalation Layer

Abstract

How water layer adsorbed on solid surface under ambient conditions affects the interfacial friction is a fundamental question for understanding the friction and lubrication phenomena in practical system. We investigate the formation of ice-like(IL) water layers on the hydrophobic surface of graphite with partially covered MoO₃ nanoflakes(NFs) using atomic force microscopy(AFM) based techniques. The IL water layers are found surrounding the MoO₃ NFs and also intercalated at the MoO₃/graphite interface, as proved by thickness measurements as well as local adhesion force and surface potential mappings. AFM manipulations carried out on MoO₃ NFs on graphite show that the presence of the IL water layers increases the frictional resistance of the interface. Comparing the results on continuous and discontinuous IL water layers, we can identify the different sliding interfaces in the two scenarios. The increased friction for MoO₃ NFs sliding on graphite with an intercalated water layer is attributed to the energy dissipation originated from the metastable nature of the IL layers.

Keywords

Friction / Ice-like water / MoO₃ / Graphite

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