Inorganic nanoparticles have been proved as powerful lubricant additives at elevated temperature. However, the tribological properties are inevitably impaired due to poor dispersion and insufficient high temperature resistance of organic matter modified nanoparticles. Here, we prepare a self-dispersed molybdenum disulfide quantum dot/graphene crumpled ball (MGCB) comprising molybdenum disulfide quantum dot uniformly interspersed on the wrinkled graphene ball. The crumpled ball composite possesses excellent dispersity in polyalkylene glycol base oil without depending on surface modifiers. Compared with the conventional phosphate esters lubricant, our results indicate MGCB could vastly improve the lubrication performance of polyalkylene glycol with an extremely low concentration (0.05 wt%) at elevated temperature (150 °C), showing a friction reduction of 47% and a wear reduction of 30% compared with the conventional phosphate esters lubricant (tricresyl phosphate, TCP). This is because crumpled ball potentiates synergistic lubrication effect within the boundary lubrication. Overall, we envision our designed self-dispersed MGCB has significant potential in tribological application at elevated temperature.

无机纳米粒子已被证明是高温下强大的润滑剂添加剂。然而，由于有机物改性纳米粒子的分散性差和耐高温性不足，摩擦学性能不可避免地受到损害。在这里，我们制备了自分散二硫化钼量子点/石墨烯皱球（MGCB），其包含均匀散布在皱褶石墨烯球上的二硫化钼量子点。皱球复合材料在聚亚烷基二醇基础油中具有优异的分散性，而不依赖于表面改性剂。与传统的磷酸酯润滑剂相比，我们的结果表明，极低浓度（0.05 wt%）的 MGCB 在高温（150 °C）下可以极大地改善聚亚烷基二醇的润滑性能，摩擦力减少 47%，磨损减少与传统磷酸酯润滑剂（磷酸三甲苯酯，TCP）相比减少30%。这是因为皱球增强了边界润滑内的协同润滑效果。总的来说，我们预计我们设计的自分散 MGCB 在高温摩擦学应用中具有巨大潜力。