Abstract
The research of adsorption water on metal surfaces has been conducted mainly with FT-IR and QCM (Quartz Crystal Micro-balance). Among these methods, QCM has the high reliability as a research technique of adsorption water because of its relatively easy experiment. However, there has been no report on the direct observation of growth of water droplet or a water film on QCM surface. At present, therefore, it is difficult to understand the growth mechanism of water droplets or water film. In this study, the QCM measurement of adsorption water was carried out using a gold-coated quartz crystal. Moreover, for comparison with the QCM results, the non-contact mode AFM measurement was made by using an environmental cell that can control the relative humidity, and the nucleation and disappearance of water droplets were directly observed. As the results, the change in weight as a function of relative humidity by the QCM measurement was small when the gold surface of QCM was clean and few water droplets were present on the surface. It has been confirmed that the increase and decrease in weight depending on the relative humidity are due to the growth and shrink of adsorbed water droplets.
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