纳米WS2润滑晶体的制备与量子尺寸效应
来源期刊：中南大学学报(自然科学版)2001年第1期
论文作者：孙克辉 韦钦 罗文东 王皋
文章页码：33 - 35
关键词：WS2;润滑晶体;纳米簇团;量子尺寸效应
Key words：WS2; lubricating crystal; nano cluster; quantum size effect
摘 要：纳米WS2润滑晶体是一种性能优良的新型固体润滑材料.作者介绍了一种用机械-物理固相反应装置制备纳米WS2润滑晶体的新方法;用XRD对WS2纳米晶体进行了物相分析;用ESCALAB-MKⅡ型电子能谱仪分析了不同粒径的试样W 4f7/2,S 2p3/2电子结合能的变化,并对50 nm和10 mm粒径的S-W-S纳米簇团的S 2p3/2电子能谱结构进行谱图拟合.分析结果表明:XRD图样显示为WS2相单相;在S-W-S纳米簇团中存在显著的量子尺寸效应,该效应强化了硫原子电子壳层间的轨道杂化,使纳米级的WS2润滑晶体形成了1个没有悬键的、化学性能稳定的中空球体,在润滑过程中,这种结构可使体系保持较强的化学稳定性,能耗降低.
Abstract: Nano WS2 crystal is a kind of solid lubrication material with excellent lubrication performance. This paper reports a new method of preparing nanoWS2 lubricating crystal using equipment of Mechanical-physical Solid State Reaction Methods (MPSSRM). The phase analyses of nano WS2 lubricating crystal were made in the experiment of XRD. The shift of binding energies from W 4f7/2and S 2p3/2electrons for specimens of different diameters was investigated with ESCAL-AB-MKⅡ, and the spectra fitting analysis for S 2p3/2electron in S-W-S cluster of diameters 50 nm and 10 nm were performed. The results show that the diffraction patterns for WS2 single phase were observed; the pronounced quantum size effect exists in S-W-S nano clusters, and it enhances the hybridization of different electronic shell obits and formed a closed hollow spherical structure without any dangling bond. In the lubricating process, such a system can maintain its chemical stability and decrease energy dissipation.
