The Preparations of Graphene-Like Molybdenum Disulfide and Research in Tribological Properties in High Vacuum

In this study, graphene-like MoS₂ nanosheets were prepared by electrochemical exfoliation. The graphene-like MoS₂ were characterized using field-emission scanning electron microscopy, high-resolution transmission electron microscopy. The tribological properties of graphene-like MoS₂ as an additive in ionic liquids at high vacuum were compared to that of bare ionic liquid (IL). The wear surfaces were analyzed via optical microscope and scanning electron microscopy, chemical composition of the nanofluids (IL and IL-MoS₂) were investigated via X-ray photo electron spectroscopy. The results show that large-area MoS₂ nanosheets can be obtained from the simple electrochemical exfoliation method. The exfoliated MoS₂ nanosheets were of high quality and had an intrinsic structure. Ionic liquids with graphene-like MoS₂ had low friction and low wear rate under high vacuum condition. The improved frictional properties were attributed to the transfer film of graphene-like MoS₂.