Design and evaluation of a mixed monolayer consisting of alkylsilane and novel crown-type molecules
Design and evaluation of a mixed monolayer consisting of alkylsilane and novel crown-type molecules
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DOI：
10.1039/c3ra45690k
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发表时间：
2014-01-01
期刊：
影响因子：
3.9
通讯作者：
Zhang, Junyan
中科院分区：
文献类型：
--
作者：
Chen, Li;Yang, Baoping;Zhang, Junyan
通过自组装，在羟基化硅衬底上形成了由六氯三苯并三醌（HCTQ）和3-[2-（2-氨基乙基氨基）乙基氨基]丙基三甲氧基硅烷（TA）组成的混合膜及其单组分膜。采用椭偏仪、接触角测量、衰减全反射傅立叶变换红外光谱（ATR-FTIR）、多功能x射线光电子能谱（XPS）和原子力显微镜（AFM）对膜的形成和表面性质进行了表征。分别用原子力显微镜和球-板摩擦计对膜的纳米和微摩擦性能进行了评价。结果表明，与单组分膜相比，混合膜具有更高的纳米和微摩擦学性能。这是由于冠型分子的承载能力与直链分子的减摩贡献之间的协同作用。冠型分子中的多官能团和刚性芳香主链增强了混合膜的稳定性和抗磨性能，而柔性烷基硅烷则起到了减少摩擦的润滑剂作用。此外，冠状分子与烷基硅烷的两步组装可以形成更加致密有序的混合膜，这有利于提高耐久性和抗磨性能。
A mixed film composed of crown-type molecule hexachlorotribenzotriquinacene (HCTQ) and 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane (TA), together with their single-component films, were formed on hydroxylated silicon substrates by self-assembly. The formation and surface properties of the films were characterized by means of ellipsometry, contact angle measurement, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectrometry, multi-functional X-ray photoelectron spectra (XPS), and atomic force microscopy (AFM). The nano- and micro-tribological behavior of the films was evaluated by AFM and ball-on-plate tribometer, respectively. The results show that the mixed film exhibits enhanced nano- and micro-tribological properties as compared to the single-component films. This is attributed to the synergic effect between the load-carrying capacity of the crown-type molecule and the friction-reducing contribution of the straight chain molecule. The multiple functional groups and rigid aromatic backbone in the crown-type molecule enhance the stability and the anti-wear property of the mixed film, while the flexible alkylsilane serves as lubricant for reducing the friction. In addition, the two-step assembly of the crown-type molecule and alkylsilane can form more densely packed and ordered mixed film, which is beneficial to improving the durability and anti-wear property.