Abstract
Ultrathin oil-soluble tungsten disulfide nanosheets surface-capped with oleylamine (OA-capped WS2) were prepared by liquid phase thermal decomposition method without any solid by-products, a facile method with potential for large-scale production. OA-capped WS2 nanosheets exhibit good dispersibility and long-term stability in poly alpha olefin oil and significantly enhance the lubricating properties of the base oil over a wide temperature range (from 25 °C to 200 °C). This is because the surface-capped WS2 nanosheets can be well adsorbed on friction surfaces forming a lubricating film (mainly WS2) and participate in tribological chemical reaction to generate a chemical reaction film consisting of WO3, FeS, FeSO4, iron oxides, and FeOOH on the worn steel surfaces during friction process.
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