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Nanomaterials 2020, 10, 200 8 of 13 μm. Moreover, the anti-wear property improved with the amount of MoS2 QDs. This indicates that NanoMmoatSer2iaQlsD2s02i0n, 1p0a, r2o00line oil prevented the ploughing wear that was evident in the control sample. 8 of 12 Figure 6. Three-dimensional (3D) wear profiles for different lubricants: (a) pure paroline oil; (b) paroline Figure 6. Three-dimensional (3D) wear profiles for different lubricants: (a) pure paroline oil; (b) oil loading 0.1 wt.% MoS2 QDs; (c) paroline oil loading 0.3 wt.% MoS2 QDs; (d) paroline oil loading paroline oil loading 0.1 wt.% MoS2 QDs; (c) paroline oil loading 0.3 wt.% MoS2 QDs; (d) paroline oil 0.5 wt.% MoS2 QDs. loading 0.5 wt.% MoS2 QDs. 3.4. Lubrication Mechanism Figure 7 reveals the presence of Mo and S elements within the wear track when lubricated with Figure 7 reveals the presence of Mo and S elements within the wear track when lubricated with 3.4. Lubrication Mechanism paroline and 0.2 wt.% MoS2 QDs. As shown in Figure 7d,e, the EDS mapping results clearly confirmed paroline and 0.2 wt.% MoS2 QDs. As shown in Figure 7d,e, the EDS mapping results clearly confirmed the presence of Mo and S elements within the wear track, suggesting that the capping layer of MoS2 the presence of Mo and S elements within the wear track, suggesting that the capping layer of MoS2 QDs also contributed to forming the tribo-film. The atomic ratio of elements Mo and S was 2.17:1, QDs also contributed to forming the tribo-film. The atomic ratio of elements Mo and S was 2.17:1, as as shown in Figure 7c, suggesting the formation of a tribo-film composed of Mo and S. shown in Figure 7c, suggesting the formation of a tribo-film composed of Mo and S. XPS was employed to study the surface chemical composition of the wear scars of the steel discs, which were lubricated by paroline oil with MoS2 QDs, revealing visible Mo and S peaks. As shown in Figure 8, the XPS peaks of Mo in Figure 8a were mainly attributed to Mo–O or Mo–S. The Mo and the S peaks at 235.7 eV and 165.1 eV corresponded to MoS2, confirming the formation of the MoS2 tribo-film on the wear scar, in agreement with the O–S of O1s at 531.6 eV in Figure 8b,c [26]. The peak of the bond energy of 168.9 eV in Figure 8b was attributed to S2p, i.e., the bond of sulfur to oxygen (S–O).PDF Image | Nano-MoS2 Quantum Dots as Liquid Lubricant Additive for Tribo
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