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document
The Effect of Water Uptake on the Response of a Polymer Based QCM Sensor for Hydrocarbons
Abstract
The direct measurement of hydrocarbon compounds in complex mixtures is important in many areas such as envi-ronmental monitoring, process control, biomedical diagnosis, etc. Chemical sensors based on a polymer coated quartz crystal microbalance (QCM) have been widely used to detect a range of hydrocarbons in both the vapour and aqueous phase. Although promising analytical re-sults have been obtained, non-gravimetric processes can contribute significantly to the sensor response. This paper addresses the response mechanism of a QCM sensor for the detection of BTEX compounds in aqueous solutions. Several different polymers were spun coated onto the quartz crystal and its analytical properties were investigated under various conditions. The influence of water soaking time on the per-formance of the polymer film was also examined. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was employed to study the hydro-carbon and water uptake in the films. Positron annihilation lifetime spectroscopy (PALS) measurements were made to evaluate the pore size and distribution in the polymer.