磁头表面含氟三氯硅烷自组装膜的生长机理

在磁头表面制备了1H，1H，2H，2H-四氢全氟辛烷基三氯硅烷（FOTS）自组装膜，采用X射线光电子能谱仪（XPS）、时间飞行二次离子质谱仪（TOF-SIMS）、接触角测量仪和原子力显微镜（AFM）对FOTS自组装膜进行表征，研究了自组装膜的生长机理．结果表明，FOTS自组装膜的生长经过了亚单层膜的低等覆盖，亚单层膜的中等覆盖、团聚和聚结四个阶段．其中第一层和第二层自组装膜的亚单层膜形态和生长方式不同，第一层的亚单层膜呈岛状，岛的生长是自身向外扩展；第二层的亚单层膜呈簇状，簇通过效量增加来实现生长．超薄完整的单层FOTS自组装膜（膜厚为0．8nm、Ra为0．125nm）能使磁头表面的接触角值增加，疏水性能提高．

Growth mechanisms of fluoroalkyltrichlorosilane self-assembled monolayers on the magnetic head surface

A self-assembled monolayers (SAMs) of tridecafluoro-1,1,2,2-tetrahydrooctyltrichloro-silane (FOTS) was prepared on the magnetic head, which was characterized by the X-ray photoelectron spectroscopy (XPS), the time-of-flight secondary ion mass spectrometer (TOF-SIMS), contact angle measurement and atomic force microscopy (AFM). The results showed that the growth process of the FOTS SAMs could be outlined four regimes, namely, a low-coverage nucleation regime, an intermediate coverage regime, an aggregation regime and a coalescence regime. And the configuration and growth way of submonolayer were different between the first monolayer and the second monolayer. The first submonolayer grew as the configuration of an island, and the island size enlarged with the growth of the submonolayer. However, the second submonolayer grew as the configuration of a cluster, and the number of clusters increased with submonolayer growing. The FOTS monolayer is helpful for considerably improving hydrophobicity of the magnetic head surface and preventing its damage due to contaminant-absorb.