Monodisperse Cu nanoparticles @ MoS2 nanosheets as a lubricant additive for improved tribological properties
Monodisperse Cu nanoparticles @ MoS2 nanosheets as a lubricant additive for improved tribological properties
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单分散铜纳米粒子 @ MoS2 纳米片作为润滑剂添加剂以改善摩擦学性能
DOI：
10.1016/j.apsusc.2019.07.194
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发表时间：
2019-11-15
影响因子：
6.7
通讯作者：
Song, Haojie
中科院分区：
文献类型：
--
作者：
Jia, Xiaohua;Huang, Jian;Song, Haojie
采用简单的原位还原法制备了单分散的Cu纳米颗粒@MoS2纳米片。将平均直径为8-13 nm的锚定Cu纳米颗粒均匀地修饰在聚多巴胺（PDA）功能化的MoS 2纳米片表面（Cu/PDA/MoS 2）。所得的Cu/PDA/MoS 2纳米片高度分散在向日葵油中，因为PDA膜提供了大量的活性锚定位点。研究了Cu/PDA/MoS 2纳米片作为向日葵籽油润滑添加剂的摩擦学性能。Cu/PDA/MoS 2纳米片在所有滑动测试中表现出最佳的润滑性能。对于0.5wt%的Cu/PDA/MoS 2纳米片与向日葵籽油混合，平均摩擦系数和磨痕宽度分别比纯向日葵籽油降低了37.8%和28.5%。这种优异的润滑性能不仅归因于单分散Cu纳米颗粒和MoS 2纳米片的协同润滑作用，而且还归因于在摩擦表面形成了稳定的转移膜。此外，通过能谱仪（EDS）和X射线光电子能谱仪（XPS）研究了Cu/PDA/MoS 2纳米片的润滑机理。
Monodisperse Cu nanoparticles @ MoS2 nanosheets were prepared via a facile in-situ reduction method. The anchored Cu nanoparticles with average diameters of 8-13 nm were homogeneously decorated on the poly-dopamine (PDA) functionalized MoS2 nanosheet surface (Cu/PDA/MoS2). The resulting Cu/PDA/MoS2 nanosheets were highly dispersed in sunflower oil because the PDA film provided a large number of active anchoring sites. The tribological performances of the Cu/PDA/MoS2 nanosheets as a sunflower oil lubrication additive were investigated. The Cu/PDA/MoS2 nanosheets demonstrated optimal lubrication properties in all the sliding tests. For 0.5 wt% Cu/PDA/MoS2 nanosheets mixed with sunflower oil, the average friction coefficient and wear scar width were decreased by 37.8% and 28.5% compared with those for the neat sunflower oil, respectively. The excellent lubrication performance can be ascribed not only to the synergistic lubricating effects of the monodisperse Cu nanoparticles and MoS2 nanosheets but also the formation of stable transfer films on the rubbing surfaces. Furthermore, the lubricating mechanism of the Cu/PDA/MoS2 nanosheets was investigated by studying the worn steel disk surfaces via energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS).