火焰退火金基底上十八硫醇自组装单层膜的结构和稳定性及其在微流体中的潜在应用

Jingmin Han, Xiaodong Wang, D. Kwok
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摘要

自组装单层膜(SAMs)是由有机硫醇在金表面吸附而成的,其在微纳米流体系统中的潜在应用得到了广泛的研究。然而,几乎所有的应用程序都依赖于sam的稳定性。由于高能金易吸附环境中的有机污染物,在实验室环境中无法获得完全湿润的金表面。在吸附前对金表面进行火焰退火处理,不仅可以去除有机污染物,还可以剃掉蒸发金表面的“起伏的山丘”。在退火金表面形成的地膜比在蒸发金表面形成的地膜具有更好的结构和稳定性。这些特性将有助于微流体系统作为表面改性的潜在应用。利用非原位椭偏光谱和傅里叶变换红外光谱(FTIR)对其结构进行了表征。
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Structure and Stability of Self-Assembled Monolayers for Octadecanethiol Adsorbed onto Flame-Annealed Gold Substrate and Its Potential Application to Microfluidics
Self-Assembled Monolayers (SAMs) derived from the adsorption of organothiols onto gold have been extensively investigated for studying their potential applications to Micro- and Nanofluidics system. However, nearly all applications rely on SAMs' stability. Because high energy gold is easy to absorb organic contaminant from ambient, totally wetting gold surface can not be obtained in the laboratory environment. Flame annealing the gold surface before adsorption not only remove the organic contaminant, it also shaves the "rolling hills" on the evaporated gold surface. SAMs formed on annealed gold surface have better structure and stability than those formed on evaporated gold. These properties will be helpful for potential application on microfluidics system as a surface modification. Ex situ spectroscopic ellipsometry, and Fourier Transform Infrared (FTIR) were used to characterize the structure of SAMs.
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