Different layers of MoS₂ were grown on the surface of carbon nanotubes (CNTs) successfully with a facile and effective chemical vapor deposition method. The pristine CNTs (PCNTs) were pretreated with 5 mol L^–1 HNO₃, 10 mol L^–1 HNO₃, and mixed acid (sulfuric acid/nitric acid = 3:1) to obtain weakly oxidized CNTs (WOCNTs), moderately oxidized CNTs (MOCNTs), and strongly oxidized CNTs (SOCNTs). According to the results of SEM, EDS, TEM, Raman, XRD, and XPS, more layers of MoS₂ were grown on the surface of SOCNTs uniformly due to the abundant defects on its surface. The friction-reducing and antiwear performance of dibutyl phthalate (DBP) containing SOCNTs, MoS₂, SOCNTs/MoS₂ mixture, and SOCNTs@MoS₂ composite were investigated under 392 N and 1200 rpm at room temperature by four-ball tribotester. The DBP containing 0.02 wt % SOCNTs@MoS₂ composite exhibited the best tribological performance, and the friction coefficient and wear scar diameter (WSD) were reduced by 57.93% and 19.08%, respectively. The synergistic effect between SOCNTs and MoS₂ was further explored by comparing the lubricant mechanism of the different additives. A possible mechanism was proposed, and the SOCNTs@MoS₂ composite can be deposited on the rubbing surface due to the microstructure and translated into tribo-film which can protect the friction pair.

中文翻译：

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SOCNTs @ MoS ₂复合材料作为润滑剂添加剂的摩擦学研究：协同效应

Mos _2的不同层通过一种便捷有效的化学气相沉积方法成功地生长在碳纳米管（CNT）的表面上。的原始CNT（PCNTs）用5mol L的预处理^-1 HNO ₃，10摩尔大号^-1 HNO ₃，和混酸（硫酸/硝酸= 3:1），得到弱氧化的CNT（WOCNTs），适度氧化CNT（MOCNT）和强氧化的CNT（SOCNT）。根据SEM，EDS，TEM，拉曼，XRD和XPS的结果，由于SOCNT表面上的大量缺陷，在其表面上均匀地生长了更多的MoS ₂层。含SOCNTs，MoS ₂的邻苯二甲酸二丁酯（DBP）的减摩和抗磨性能在室温下，在392 N和1200 rpm下，通过四球三botester研究了SOCNTs / MoS ₂混合物和SOCNTs @ MoS ₂复合材料。含有0.02 wt％SOCNTs @ MoS ₂复合材料的DBP表现出最佳的摩擦学性能，其摩擦系数和磨损痕迹直径（WSD）分别降低了57.93％和19.08％。通过比较不同添加剂的润滑机理，进一步探索了SOCNTs与MoS ₂之间的协同作用。提出了一种可能的机制，由于其微观结构，SOCNTs @ MoS ₂复合材料可以沉积在摩擦表面上并转化为摩擦膜，从而可以保护摩擦副。