Load-independent friction:: MoO3 nanocrystal lubricants

被引：89

作者：

Wang, JF ^{[1
]}

Rose, KC ^{[1
]}

Lieber, CM ^{[1
]}

机构：

[1] Harvard Univ, Dept Chem & Biol Chem, Cambridge, MA 02138 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 40期

关键词：

D O I：

10.1021/jp9920794

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The behavior of the model lubricant system molybdenum disulfide (MoS2) has been characterized as a function of thermal oxidation on the atomic to nanometer scales with scanning tunneling microscopy (STM) and atomic force microscopy (AFM) in ultrahigh vacuum (UHV). STM studies of single-crystal MoS2 surfaces showed that the initial stages of thermal oxidation produce atomic-scale pits and then molybdenum oxide (MoO3) nanocrystals 1-5 nm in diameter. The densities of pits and MoO3 nanocrystals and the size of MoO3 nanocrystals increased with increasing oxidation time. UHV AFM friction measurements made on these same samples exhibited a direct relationship between defect density and friction for short oxidation times. After longer oxidation times when well-defined MoO3 nanocrystals were present, load-independent friction was observed. A model, which involves adhesion of MoO3 nanocrystals to the AFM probe tip end, has been developed to explain this first observation of load-independent friction. The implications of these results are discussed.

引用

页码：8405 / 8409

页数：5

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