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Load dependence and lifetime studies of self-assembled monolayers

机译：自组装单分子层的载荷依赖性和寿命研究

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摘要

A comparative study of the microtribological properties of native oxide on Si (100), Si (100) coated with octadecyltrichlorosilane (OTS) and perfluorode-cyltrichlorosilane (FDTS) self-assembling monolayers (SAMs) is presented. The frictional properties between these samples and a bare silicon sphere were examined using a microtribometer. Microfriction was investigated as a function of the normal load and relative humidity. Also, the microfriction of OTS- and FDTS-coated surfaces was studied as a function of sliding time and normal load to examine the lifetime of these monolayers. Confirming the results of earlier studies, in the microtribological regime OTS and FDTS significantly reduce the friction force in comparison to the bare, native oxide covered (hydrophilic) silicon surface. The friction vs. normal load curve of oxide-covered surfaces as well as the SAMs can be described by contact mechanics. Lifetime measurements of the SAMs, examined as a function of the normal load and relative humidity, indicate that the OTS monolayers wear quickly in both dry and moist environments, while the lifetime of FDTS monolayers appears to increase in moist environments.
机译：提出了对天然氧化物在Si（100），涂有十八烷基三氯硅烷（OTS）和全氟脱氯三氯硅烷（FDTS）自组装单分子膜（SAMs）的Si（100）上的摩擦学性能的比较研究。使用微摩擦计检查了这些样品与裸露的硅球之间的摩擦性能。研究了微摩擦与正常载荷和相对湿度的关系。同样，研究了OTS和FDTS涂层表面的微摩擦，作为滑动时间和法向载荷的函数，以检查这些单层的寿命。与早期的自然氧化物覆盖的（亲水性）硅表面相比，OTS和FDTS在微摩擦学领域证实了先前研究的结果，大大降低了摩擦力。可以通过接触力学描述氧化物覆盖表面以及SAM的摩擦力与法向载荷曲线。根据正常负载和相对湿度的函数对SAM的寿命进行测量，结果表明，OTS单层在干燥和潮湿环境中的磨损都很快，而FDTS单层的寿命在潮湿环境中似乎会增加。

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