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Synthesis of hollow fullerene-like molybdenum disulfide/reduced graphene oxide nanocomposites with excellent lubricating properties
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以气体产物为模板制备中空富勒烯结构二硫化钼、以氧化石墨烯表面生成的层状二硫化钼为连接层，制备了中空富勒烯结构二硫化钼/石墨烯纳米复合材料。该三维球-面结构可通过纳米滚轴作用显著提高润滑脂的摩擦学性能。
摘要速递
该工作制备了中空富勒烯结构二硫化钼/还原氧化石墨烯纳米复合材料（HIF-MoS2/RGO）。制备二硫化钼时的产物气体NH3作为模板以形成HIF-MoS2、氧化石墨烯表面形成的片状二硫化钼可作为中间层以连接HIF-MoS2与RGO，从而形成了球-面三维结构。
将该材料加入到离子液体润滑脂中，能够显著提高润滑脂的摩擦学性能。尤其在3.0 GPa下，其抗磨性能比纯的润滑脂提高了96%，即使在4.1 GPa的苛刻压力下，仍然保持较好的润滑效果。而单独添加HIF-MoS2、RGO或者两者的混合物，均无如此显著的提高。该种球-面结构能够通过HIF-MoS2在RGO表面的滚轴作用以及增加金属摩擦材料的间距以降低摩擦系数和磨损。
图文快解
Fig. 1. FESEM images of (a, e) HIF-MoS2/1.81RGO, (b, f) HIF-MoS2/0.46RGO, (c, g) HIF-MoS2/0.23RGO and (d, h) HIF-MoS2 at different magnifications.
Fig. 2. (a-e) TEM images of HIF-MoS2/0.46RGO at different magnifications; (f-i) are the EDS results.
Fig. 3. (a) Raman spectra of RGO, HIF-MoS2 and HIF-MoS2/RGO nanocomposites, (b) XRD patterns of RGO and two HIF-MoS2/RGO nanocomposites.
Fig. 4. Nitrogen adsorption/desorption isotherms of HIF-MoS2/RGO nanocomposites, and SBET is inserted.
Fig. 5. Schematic illustration for the formatting of HIF-MoS2/RGO heterostructure: bubble-on-plate structure.
Fig. 6. Log-log plots of (a) shear stress and (b) viscosity as a function of shear rate; (c) pictures of neat grease (left) and HIF-MoS2/0.46RGO reinforced grease (right) after being upside down for different time at 25 ℃.
Fig. 7. Disc wear volume and ball wear diameter lubricated by greases with different additives at (a-b) 2.5 GPa and (c, d) 3.0 GPa.
Fig. 8. 3D microscopic images of disc wear tracks: neat grease, 0.2%RGO, 0.4%HIF-MoS2, 0.1%HIF-MoS2/0.46RGO and 0.4%MoS2-200nm at (a-e) 2.5 GPa and (f-j) 3.0 GPa; (a’-j’) are 3D microscopic images of ball wear tracks sliding against discs above, (a’), (b’) … (j’) is against (a), (b) … (j), respectively.
Fig. 9. Online friction coefficient of greases reinforced with different additives at (a-d) 2.5 GPa and (e, h) 3.0 GPa.
Fig. 10. (a-d) HIF-MoS2/0.46RGO as additives after friction test under 3.0 GPa for 4 h, and (e-h) EDS results of HIF-MoS2/0.46RGO in (d).
Fig. 11. (a) Ball wear diameter and the radio of ball wear diameter to the Hertzian contact diameter (R/Rc), (b) friction coefficient for neat grease and HIF-MoS2/RGO reinforced grease under increasing pressures.
Fig. 12. Optical images of ball and disc wear tracks, online friction coefficient curves of (a-d) HIF-MoS2/RGO reinforced grease and (e, f) neat grease under increasing pressures. FESEM images, EDS and Raman spectra of disc wear tracks lubricated with HIF-MoS2/RGO reinforced grease under (g) 3.0 GPa and (h) 4.3 GPa.
Fig. 13. Speculated mechanism of the lubricating effect of HIF-MoS2/RGO nanocomposites.
特色创新
1. 制备了中空富勒烯结构二硫化钼/石墨烯纳米复合材料。
2. 将该材料加入到离子液体润滑脂中，能够显著提高润滑脂的摩擦学性能。
3. 该种球-面结构能够通过HIF-MoS2在RGO表面的滚轴作用以及增加金属摩擦材料的间距以降低摩擦系数和磨损。
文献链接
Synthesis of hollow fullerene-like molybdenum disulfide/reduced graphene oxide nanocomposites with excellent lubricating properties (Carbon, 2018, 134: 423−430)
DOI: 10.1016/j.carbon.2018.04.021
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