Molecularly Specific Studies of the Frictional Properties of Monolayer Films: A Systematic Comparison of CF3-, (CH3)2CH-, and CH3-Terminated Films
Molecularly Specific Studies of the Frictional Properties of Monolayer Films: A Systematic Comparison of CF3-, (CH3)2CH-, and CH3-Terminated Films
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DOI：
10.1021/la981497h
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发表时间：
1999-04
期刊：
影响因子：
3.9
通讯作者：
H. Kim;M. Graupe;Olugbenga Oloba;T. Koini;S. Imaduddin;and T. Randall Lee;S. Perry
中科院分区：
文献类型：
--
作者：
H. Kim;M. Graupe;Olugbenga Oloba;T. Koini;S. Imaduddin;and T. Randall Lee;S. Perry
自组装膜的摩擦性能与膜的化学结构/组成的系统相关性，研究了自组装膜中摩擦力的来源。原子力显微镜用于探测由甲基、异丙基和三氟甲基封端的烷硫醇在Au（111）表面上吸附形成的自组装膜的摩擦性质。由不同浓度的甲基和三氟甲基封端的硫醇的混合单分子膜的摩擦性能进行了研究。偏振调制红外反射吸收光谱法被用来测量这些单分子膜中的每一个的振动光谱，并进而确定每一个的特征在于由一个良好的包装骨架结构。对于这些电影，不同的只是在最外层的化学功能的性质，摩擦响应的大幅增强，观察到与异丙基和三氟甲基端基和混合单层膜。
The origin of frictional forces in self-assembled monolayers (SAMs) was investigated through systematic correlation of the frictional properties with the chemical structure/composition of the films. Atomic force microscopy was used to probe the frictional properties of the SAMs formed by the adsorption of methyl-, isopropyl-, and trifluoromethyl-terminated alkanethiols on Au(111) surfaces. The frictional properties of mixed monolayers composed of varying concentrations of the methyl- and trifluoromethyl-terminated thiols were also studied. Polarization modulation infrared reflection adsorption spectroscopy was used to measure the vibrational spectra of each of these monolayers and in turn to determine that each was characterized by a well-packed backbone structure. For these films, which differed only in the nature of the outermost chemical functionality, a substantial enhancement in the frictional response was observed for films with isopropyl- and trifluoromethyl-terminal groups and for mixed monolayers...