Abstract

The quartz crystal microbalance (QCM) has been employed extensively for measurement of mass changes at metal surface while the metal coated electrode is immersed in a liquid. We report the real time in-situ adsorption kinetic trends of alkanethiol CH 3(CH 2) n–1 SH ( n=8, 12, 16) monolayers with different chain lengths and solvents using QCM. Regarding 1-octanethiol monolayer formation on gold surface, we could identify the two distinct monolayer formation steps in hexane and ethanol solutions. The adsorption process of alkanethiols is characterized by two distinct steps. In the kinetically controlled initial monolayer formation step, the adsorption rate of short chain alkanethiols is faster than that of long chain alkanethiols. The second step is a thermodynamically controlled ordering and packing process. In case of short chain alkanethiols, these two separated adsorption steps were clearly observed, but in the case of long chain alkanethiols (over 10 carbon numbers) only one step of monolayer formation was observed.

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