氨基表面组装薄膜的构筑及其微观摩擦学特性

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A series of amide-containing self-assembled films were prepared on sing!e-crystal silicon suostrates using a two-step method. 3- 2- （2-aminoethylamino） ethylamino propyhrimethoxysilane （ TA ） was self-assembled on silicon sur- faces to form the first layer, and then the amide-modified surface was modified with an array of carboxylic acids to form the second layer via surface coupling reaction. The formation and micro-tribologlcal properties of these self-assembled films were characterized by means of e]]ipsometry, contact angle measurement and atomic force microscope （AFM）, The resu]ts indicate that the films with hydrophobic terminal groups present lower adhesion and friction force, and the molecule with long chain is benefit to form more densely packed self-assembly films which possess lower friction force and frictional coef- ficient.以二乙烯三胺基丙基三甲氧基硅烷（TA）作为分子底层，采用两步组装的方法在单晶硅基底表面制备一系列相同结构不同分子链长的自组装双层薄膜。利用椭圆偏光测厚仪、接触角测定仪、原子力显微镜（AFM）等对薄膜的形成及微观摩擦力进行表征。研究结果表明，低表面能的疏水性末端基团有利于降低薄膜的摩擦力和摩擦因数；组装分子碳链长度的增加有助于形成有序性强和致密度高的组装薄膜，从而减小薄膜表面的摩擦力和摩擦因数。