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Surface Oxidation and Electron Transfer of MoS2 During Friction
Qi Shangku,Yu Laigui,,Liu Weimin,Xue Qunji
Author NameAffiliation
Qi Shangku State Key Laboratory of Solid Lubrication of Chemical Physics, Chinese Academy of Sciences, Lanzhou　730000 
Yu Laigui, State Key Laboratory of Solid Lubrication of Chemical Physics, Chinese Academy of Sciences, Lanzhou　730000 
Liu Weimin State Key Laboratory of Solid Lubrication of Chemical Physics, Chinese Academy of Sciences, Lanzhou　730000 
Xue Qunji State Key Laboratory of Solid Lubrication of Chemical Physics, Chinese Academy of Sciences, Lanzhou　730000 
Abstract:
The oxidation and electron transfer on the surface of MoS2during friction are studied by means of electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS). As the results, it is inferred that Mo4+changed to Mo6+ions in the friction failure process of MoS2 via Mo5+ion intermediate. The complexity of the oxidation process on the surface of MoS2during friction has also been noticed. Moreover, there exist a variety of chemical states of Mo during the oxidation process, and the oxidation of Mo is characteristic of single electron transfer in the Mo4d orbit.
Key words:  MoS2, Surface oxidation, ESR, XPS, Electron transfer
FundProject:
MoS2摩擦表面氧化与电子转移
齐尚奎,余来贵,刘维民,薛群基
摘要:
利用电子自旋共振谱(ESR)和X射线光电子谱(XPS)研究了MoS2摩擦表面的氧化行为和摩擦表面氧化的电子转移，发现MoS2在摩擦失效过程中Mo4+与氧作用生成稳定的Mo6+终态氧化物，其间经过Mo5+过渡态。深入揭示了MoS2摩擦表面氧化过程的复杂性，指出Mo在摩擦表面氧化过程中以多种化学状态存在，Mo原子的氧化是Mo4d轨道上的单电子转移过程。
关键词:  MoS2表面氧化  ESR  XPS  未成对电子  电子转移  自由基离子
DOI：10.1088/1674-0068/13/5/581-586
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