Effect of Polymer Grafting on the Tribological Performance of Graphene Oxide under Ambient Air and Vacuum.

Graphene is known to be an excellent lubricant in a dry air or vacuum environment; however, the modification of its surface chemistry and friction properties is a challenging task. In contrast, mono- and few-layered graphene oxide (GO) offers easier modulation of its surface properties, but its tribological properties under vacuum are currently unknown. In this work, the impact of GO modification by poly(methyl methacrylate) (PMMA) and poly(trifluoroethyl methacrylate) (PTFEMA) on the friction in ambient air and vacuum conditions has been investigated.

Nanofriction Properties of Mono- and Double-Layer TiCT MXenes.

Unique structure and ability to control the surface termination groups of MXenes make these materials extremely promising for solid lubrication applications. Due to the challenging delamination process, the tribological properties of two-dimensional MXenes particles have been mostly investigated as additive components in the solvents working in the macrosystem, while the understanding of the nanotribological properties of mono- and few-layer MXenes is still limited. Here, we investigate the nanotribological properties of mono- and double-layer TiCT MXenes deposited by the Langmuir-Schaefer technique on SiO/Si substrates.