Facile Fabrication of γ-Graphyne/Graphitic Carbon Nitride Quantum Dots Hybrids for Enhanced Tribological Properties of Epoxy Resin Composites

The aggregation issues of two-dimensional nanomaterials remain a barrier to improving the tribological properties of the polymer matrix. Herein, γ-graphyne (γ-GY)/graphitic carbon nitride quantum dots (CNQDs) hybrids were fabricated by the hydrothermal method and incorporated into epoxy resin (EP). CNQDs are uniformly anchored onto the surfaces of γ-GY; the hybrids with multiscale structures are conducive to optimizing the interfacial compatibility with the EP. Compared with pure EP, γ-GY/CNQDs/EP composites exhibited better thermal properties, with a 27.2% increase in tensile strength. Furthermore, the average friction coefficient and wear rate were decreased by 34% and 76.2%, respectively. The wear surfaces of γ-GY/CNQDs/EP composites were analyzed via scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) to reveal the synergistic lubrication mechanism between γ-GY and CNQDs in the EP matrix.