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首页> 外文期刊>Thin Solid Films >Study of self-assembled triethoxysilane thin films made by casting neat reagents in ambient atmosphere
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Study of self-assembled triethoxysilane thin films made by casting neat reagents in ambient atmosphere

机译：在环境气氛中流延纯试剂制备自组装三乙氧基硅烷薄膜的研究

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摘要

We studied four trialkoxysilane thin films, fabricated via self-assembly by casting neat silane reagents onto hydrophilic SiO_x/Si substrates in the ambient. This drop-casting method is simple, yet rarely studied for the production of silane self-assembled monolayers (SAMs). Various ex-situ techniques were utilized to systematically characterize the growth process: Ellipsometry measurements can monitor the evolution of film thickness with silanization time; water droplet contact angle measurements reveal the wettability; the change of surface morphology was followed by Atomic Force Microscopy; the chemical identity of the films was verified by Infrared-visible Sum Frequency Generation spectroscopy. We show that the shorter carbon chain (propyl-) or branched (2-(diphenylphosphino)ethyl-) silane SAMs exhibit poor ordering. In contrast, longer carbon chain (octadecyl and decyl) silanes form relatively ordered monolayers. The growth of the latter two cases shows Langmuir-like kinetics and a transition process from lying-down to standing-up geometry with increasing coverage.
机译：我们研究了四种三烷氧基硅烷薄膜，这些薄膜是通过将纯硅烷试剂浇铸到环境中的亲水SiO_x / Si基板上并通过自组装而制成的。这种滴铸法很简单，但很少用于硅烷自组装单层膜（SAMs）的生产。利用各种异位技术来系统地表征生长过程：椭圆偏振光测量可以监测硅烷化时间对膜厚度的影响；水滴接触角的测量揭示了润湿性；用原子力显微镜观察表面形态的变化。膜的化学特性通过红外可见和频率产生光谱法验证。我们表明，较短的碳链（丙基-）或支链（2-（二苯基膦基）乙基-）硅烷SAMs表现出较差的有序性。相反，较长的碳链（十八烷基和癸基）硅烷形成相对有序的单层。后两种情况的增长显示出Langmuir样的动力学，并且具有从覆盖到覆盖的从躺下到站立的几何形状的过渡过程。

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