Molybdenum disulfide (MoS₂) nanoparticles are widely used as oil additives for obtaining low friction and wear. In this article, MoS₂ nanosheets with ultrathin shape and structure defects were prepared by a facile solvothermal method with the aid of polyethylene glycol (PEG 200). The products were analysed by X‐ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X‐ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR). Results indicated that PEG 200 played a crucial role as the shape controller in the formation of different MoS₂ structures. Interestingly, the prepared MoS₂ perform excellent in improving the friction‐reducing and antiwear properties of oils. More importantly, the lubricating behaviour of the obtained MoS₂ nanosheets as oil additives was still effective in the harsh condition of heavy load and high temperature. Further, the excellent lubrication performance of the prepared MoS₂ was discussed based on the exfoliation into individually ultrathin nanosheets and nanosized debris, and the formation of MoS₂‐based tribofilm inside the wear tracks.

中文翻译：

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PEG辅助溶剂热合成具有增强摩擦学性能的MoS2纳米片

二硫化钼（MoS ₂）纳米粒子被广泛用作油添加剂，以获得低摩擦和磨损。在本文中，借助于聚乙二醇（PEG 200）的简便溶剂热法制备了具有超薄形状和结构缺陷的MoS ₂纳米片。通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线光电子能谱（XPS）和傅里叶变换红外（FTIR）对产品进行了分析。结果表明，PEG 200在不同的MoS ₂结构形成中起形状控制器的作用。有趣的是，准备好的MoS ₂在改善机油的减少摩擦和抗磨性能方面表现出色。更重要的是，所得的MoS ₂纳米片作为油添加剂的润滑行为在重负荷和高温的苛刻条件下仍然有效。此外，基于剥离成单独的超薄纳米片和纳米级碎屑，以及在磨损痕迹内形成基于MoS ₂的摩擦膜，讨论了制备的MoS ₂的优异润滑性能。