摘要
利用胺基与C60 分子的加成反应 ,在 3 胺基丙基 三乙氧基硅烷 (APS)的自组装单分子膜 (SAMs)表面上成功的制备了与基底化学键结合的C60 SAMs。其表面水接触角约为 76° ,膜厚约为 1.15nm ,AFM形貌像显示其表面光滑、均匀 ,基本不含缺陷。摩擦学结果表明 ,APS自组装单分子膜由于其分子链短 ,膜的有序性差 ,表面颗粒聚集物及“针孔”等缺陷多 ,而不具有润滑作用。当在其上形成C60 单分子层膜后 ,表现出优异的摩擦学性能 ,摩擦系数约为 0 .0 9～ 0 .13,在给定实验条件下抗磨损寿命大于 10 0 0 0次 ,有望作为微型机械的边界润滑材料使用。
Self assembled monolayer film of C 60 (C 60 SAMs) was prepared on 3 Aminopropyltrethoxysilane (APS) modified silicon substrate surface. The formation of the C 60 SAMs was confirmed by ellipsometric thickness and contact angle measurements, at the same time, the morphologies were examined using atomic force microscopy (AFM). The surface of APS SAMs exhibited inhomogeneous topography with grains and pin hole defects which would disappeared when C 60 monolayer film was formed and the C 60 SAMs exhibited smooth and homogeneous morphology. The APS SAMs has no lubricative effect due to the inhomogeneous topography; however, the C 60 SAMs shows excellent tribological properties. The friction coefficient value was about 0.10 after 1 000 sliding cycles, and keeps stable within 10 000 sliding cycles under 1 N loads. The high wear resistance properties can be rationalized in terms of the mechanical stability and low volume compressibility of C 60 molecue. The results and analysis suggest that the chemical tethered C 60 was expected to be an excellent lubricant for micro machines.
出处
《机械强度》
EI
CAS
CSCD
北大核心
2001年第4期507-510,共4页
Journal of Mechanical Strength
基金
国家自然科学重点基金资助项目 (50 0 2 30 0 1 )
关键词
微电子机械系统
自组装单分子膜
磨擦特性
润滑
磨擦
Micro electro mechanical system
Self assembled monolayer
Tribological properties
C 60
