A Comparative Study of Tribological Properties between Perfluoro and Non-perfluoro Alkylsilane Self-assembled Monolayers(SAMs)  

作　　者：王新宽 刘宇宏 

机构地区：[1]State Key Laboratory of Tribology,Tsinghua University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2009年第4期588-593,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China (No.50730007 and 50805086);the Foundation of Tsighua Basic Research, and the National Key Basic Research Program of China(No. 2007CB607604)

摘　　要：The tribological properties of perfluoro and non-perfluoro alkylsilane molecular films were investigated and compared detailedly. Their surface properties were characterized by X-ray photoelectron spectroscopy （XPS）, atomic force microscopy （AFM） and contact angle （CA） measurement. A ball-on-disk tribometer was used to study the frictional properties of these alkylsilane monolayers. The experimental results reveal that the alkylsilane molecular films are good candidates to decrease friction and they have good capability to endure rigorous shear forces. Perfluoro alkylsilane molecular films are bonded better with the Si substrate than the simple hydrocarbon ones. The effects of sliding velocity and normal load on friction coefficient are evident and the friction coefficient in- creases with the increase of the sliding velocity. However, friction coefficient decreases with the increase of normal load initially and then increases, indicating there exists a critical normal load for the load effect.The tribological properties of perfluoro and non-perfluoro alkylsilane molecular films were investigated and compared detailedly. Their surface properties were characterized by X-ray photoelectron spectroscopy （XPS）, atomic force microscopy （AFM） and contact angle （CA） measurement. A ball-on-disk tribometer was used to study the frictional properties of these alkylsilane monolayers. The experimental results reveal that the alkylsilane molecular films are good candidates to decrease friction and they have good capability to endure rigorous shear forces. Perfluoro alkylsilane molecular films are bonded better with the Si substrate than the simple hydrocarbon ones. The effects of sliding velocity and normal load on friction coefficient are evident and the friction coefficient in- creases with the increase of the sliding velocity. However, friction coefficient decreases with the increase of normal load initially and then increases, indicating there exists a critical normal load for the load effect.

关 键 词：perfluoroalkylsilane XPS AFM friction coefficient 

分 类 号：O627.41[理学—有机化学]